summaryrefslogtreecommitdiffstats
path: root/modules/dav/fs/repos.c
blob: 7a22000083708e9e871a2b41d0e18a07bae55f5b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
** DAV filesystem-based repository provider
*/

#include "apr.h"
#include "apr_file_io.h"
#include "apr_strings.h"
#include "apr_buckets.h"

#if APR_HAVE_UNISTD_H
#include <unistd.h>             /* for getpid() */
#endif

#include "httpd.h"
#include "http_log.h"
#include "http_protocol.h"      /* for ap_set_* (in dav_fs_set_headers) */
#include "http_request.h"       /* for ap_update_mtime() */

#include "mod_dav.h"
#include "repos.h"


/* to assist in debugging mod_dav's GET handling */
#define DEBUG_GET_HANDLER       0

#define DAV_FS_COPY_BLOCKSIZE   16384   /* copy 16k at a time */

/* context needed to identify a resource */
struct dav_resource_private {
    apr_pool_t *pool;        /* memory storage pool associated with request */
    const char *pathname;   /* full pathname to resource */
    apr_finfo_t finfo;       /* filesystem info */
    request_rec *r;
};

/* private context for doing a filesystem walk */
typedef struct {
    /* the input walk parameters */
    const dav_walk_params *params;

    /* reused as we walk */
    dav_walk_resource wres;

    dav_resource res1;
    dav_resource_private info1;
    dav_buffer path1;
    dav_buffer uri_buf;

    /* MOVE/COPY need a secondary path */
    dav_resource res2;
    dav_resource_private info2;
    dav_buffer path2;

    dav_buffer locknull_buf;

} dav_fs_walker_context;

typedef struct {
    int is_move;                /* is this a MOVE? */
    dav_buffer work_buf;        /* handy buffer for copymove_file() */

    /* CALLBACK: this is a secondary resource managed specially for us */
    const dav_resource *res_dst;

    /* copied from dav_walk_params (they are invariant across the walk) */
    const dav_resource *root;
    apr_pool_t *pool;

} dav_fs_copymove_walk_ctx;

/* an internal WALKTYPE to walk hidden files (the .DAV directory) */
#define DAV_WALKTYPE_HIDDEN     0x4000

/* an internal WALKTYPE to call collections (again) after their contents */
#define DAV_WALKTYPE_POSTFIX    0x8000

#define DAV_CALLTYPE_POSTFIX    1000    /* a private call type */


/* pull this in from the other source file */
extern const dav_hooks_locks dav_hooks_locks_fs;

/* forward-declare the hook structures */
static const dav_hooks_repository dav_hooks_repository_fs;
static const dav_hooks_liveprop dav_hooks_liveprop_fs;

/*
** The namespace URIs that we use. This list and the enumeration must
** stay in sync.
*/
static const char * const dav_fs_namespace_uris[] =
{
    "DAV:",
    "http://apache.org/dav/props/",

    NULL        /* sentinel */
};
enum {
    DAV_FS_URI_DAV,            /* the DAV: namespace URI */
    DAV_FS_URI_MYPROPS         /* the namespace URI for our custom props */
};

/*
** Does this platform support an executable flag?
**
** ### need a way to portably abstract this query
**
** DAV_FINFO_MASK gives the appropriate mask to use for the stat call
** used to get file attributes.
*/
#ifndef WIN32
#define DAV_FS_HAS_EXECUTABLE
#define DAV_FINFO_MASK (APR_FINFO_LINK | APR_FINFO_TYPE | APR_FINFO_INODE | \
                        APR_FINFO_SIZE | APR_FINFO_CTIME | APR_FINFO_MTIME | \
                        APR_FINFO_PROT)
#else
/* as above, but without APR_FINFO_PROT */
#define DAV_FINFO_MASK (APR_FINFO_LINK | APR_FINFO_TYPE | APR_FINFO_INODE | \
                        APR_FINFO_SIZE | APR_FINFO_CTIME | APR_FINFO_MTIME)
#endif

/*
** The single property that we define (in the DAV_FS_URI_MYPROPS namespace)
*/
#define DAV_PROPID_FS_executable        1

/*
 * prefix for temporary files
 */
#define DAV_FS_TMP_PREFIX ".davfs.tmp" 

static const dav_liveprop_spec dav_fs_props[] =
{
    /* standard DAV properties */
    {
        DAV_FS_URI_DAV,
        "creationdate",
        DAV_PROPID_creationdate,
        0
    },
    {
        DAV_FS_URI_DAV,
        "getcontentlength",
        DAV_PROPID_getcontentlength,
        0
    },
    {
        DAV_FS_URI_DAV,
        "getetag",
        DAV_PROPID_getetag,
        0
    },
    {
        DAV_FS_URI_DAV,
        "getlastmodified",
        DAV_PROPID_getlastmodified,
        0
    },

    /* our custom properties */
    {
        DAV_FS_URI_MYPROPS,
        "executable",
        DAV_PROPID_FS_executable,
        0       /* handled special in dav_fs_is_writable */
    },

    { 0 }        /* sentinel */
};

static const dav_liveprop_group dav_fs_liveprop_group =
{
    dav_fs_props,
    dav_fs_namespace_uris,
    &dav_hooks_liveprop_fs
};


/* define the dav_stream structure for our use */
struct dav_stream {
    apr_pool_t *p;
    apr_file_t *f;
    const char *pathname;       /* we may need to remove it at close time */
    char *temppath;
    int unlink_on_error;
};

/* returns an appropriate HTTP status code given an APR status code for a
 * failed I/O operation.  ### use something besides 500? */
#define MAP_IO2HTTP(e) (APR_STATUS_IS_ENOSPC(e) ? HTTP_INSUFFICIENT_STORAGE : \
                        APR_STATUS_IS_ENOENT(e) ? HTTP_CONFLICT : \
                        HTTP_INTERNAL_SERVER_ERROR)

/* forward declaration for internal treewalkers */
static dav_error * dav_fs_walk(const dav_walk_params *params, int depth,
                               dav_response **response);
static dav_error * dav_fs_internal_walk(const dav_walk_params *params,
                                        int depth, int is_move,
                                        const dav_resource *root_dst,
                                        dav_response **response);

/* --------------------------------------------------------------------
**
** PRIVATE REPOSITORY FUNCTIONS
*/
static request_rec *dav_fs_get_request_rec(const dav_resource *resource)
{
    return resource->info->r;
}

apr_pool_t *dav_fs_pool(const dav_resource *resource)
{
    return resource->info->pool;
}

const char *dav_fs_pathname(const dav_resource *resource)
{
    return resource->info->pathname;
}

dav_error * dav_fs_dir_file_name(
    const dav_resource *resource,
    const char **dirpath_p,
    const char **fname_p)
{
    dav_resource_private *ctx = resource->info;

    if (resource->collection) {
        *dirpath_p = ctx->pathname;
        if (fname_p != NULL)
            *fname_p = NULL;
    }
    else {
        const char *testpath, *rootpath;
        char *dirpath = ap_make_dirstr_parent(ctx->pool, ctx->pathname);
        apr_size_t dirlen = strlen(dirpath);
        apr_status_t rv = APR_SUCCESS;

        testpath = dirpath;
        if (dirlen > 0) {
            rv = apr_filepath_root(&rootpath, &testpath, 0, ctx->pool);
        }

        /* remove trailing slash from dirpath, unless it's a root path
         */
        if ((rv == APR_SUCCESS && testpath && *testpath)
            || rv == APR_ERELATIVE) {
            if (dirpath[dirlen - 1] == '/') {
                dirpath[dirlen - 1] = '\0';
            }
        }

        /* ###: Looks like a response could be appropriate
         *
         * APR_SUCCESS     here tells us the dir is a root
         * APR_ERELATIVE   told us we had no root (ok)
         * APR_EINCOMPLETE an incomplete testpath told us
         *                 there was no -file- name here!
         * APR_EBADPATH    or other errors tell us this file
         *                 path is undecipherable
         */

        if (rv == APR_SUCCESS || rv == APR_ERELATIVE) {
            *dirpath_p = dirpath;
            if (fname_p != NULL)
                *fname_p = ctx->pathname + dirlen;
        }
        else {
            return dav_new_error(ctx->pool, HTTP_INTERNAL_SERVER_ERROR, 0, rv,
                                 "An incomplete/bad path was found in "
                                 "dav_fs_dir_file_name.");
        }
    }

    return NULL;
}

/* Note: picked up from ap_gm_timestr_822() */
/* NOTE: buf must be at least DAV_TIMEBUF_SIZE chars in size */
static void dav_format_time(int style, apr_time_t sec, char *buf, apr_size_t buflen)
{
    apr_time_exp_t tms;

    /* ### what to do if fails? */
    (void) apr_time_exp_gmt(&tms, sec);

    if (style == DAV_STYLE_ISO8601) {
        /* ### should we use "-00:00" instead of "Z" ?? */

        /* 20 chars plus null term */
        apr_snprintf(buf, buflen, "%.4d-%.2d-%.2dT%.2d:%.2d:%.2dZ",
                     tms.tm_year + 1900, tms.tm_mon + 1, tms.tm_mday,
                     tms.tm_hour, tms.tm_min, tms.tm_sec);
        return;
    }

    /* RFC 822 date format; as strftime '%a, %d %b %Y %T GMT' */

    /* 29 chars plus null term */
    apr_snprintf(buf, buflen, "%s, %.2d %s %d %.2d:%.2d:%.2d GMT",
                 apr_day_snames[tms.tm_wday],
                 tms.tm_mday, apr_month_snames[tms.tm_mon],
                 tms.tm_year + 1900,
                 tms.tm_hour, tms.tm_min, tms.tm_sec);
}

/* Copy or move src to dst; src_finfo is used to propagate permissions
 * bits across if non-NULL; dst_finfo must be non-NULL iff dst already
 * exists. */
static dav_error * dav_fs_copymove_file(
    int is_move,
    apr_pool_t * p,
    const char *src,
    const char *dst,
    const apr_finfo_t *src_finfo,
    const apr_finfo_t *dst_finfo,
    dav_buffer *pbuf)
{
    dav_buffer work_buf = { 0 };
    apr_file_t *inf = NULL;
    apr_file_t *outf = NULL;
    apr_status_t status;
    apr_fileperms_t perms;

    if (pbuf == NULL)
        pbuf = &work_buf;

    /* Determine permissions to use for destination */
    if (src_finfo && src_finfo->valid & APR_FINFO_PROT
        && src_finfo->protection & APR_UEXECUTE) {
        perms = src_finfo->protection;

        if (dst_finfo != NULL) {
            /* chmod it if it already exist */
            if ((status = apr_file_perms_set(dst, perms)) != APR_SUCCESS) {
                return dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 0, status,
                                     "Could not set permissions on destination");
            }
        }
    }
    else {
        perms = APR_OS_DEFAULT;
    }

    dav_set_bufsize(p, pbuf, DAV_FS_COPY_BLOCKSIZE);

    if ((status = apr_file_open(&inf, src, APR_READ | APR_BINARY, 
                                APR_OS_DEFAULT, p)) != APR_SUCCESS) {
        /* ### use something besides 500? */
        return dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 0, status,
                             "Could not open file for reading");
    }

    /* ### do we need to deal with the umask? */
    status = apr_file_open(&outf, dst, APR_WRITE | APR_CREATE | APR_TRUNCATE
                           | APR_BINARY, perms, p);
    if (status != APR_SUCCESS) {
        apr_file_close(inf);

        return dav_new_error(p, MAP_IO2HTTP(status), 0, status,
                             "Could not open file for writing");
    }

    while (1) {
        apr_size_t len = DAV_FS_COPY_BLOCKSIZE;

        status = apr_file_read(inf, pbuf->buf, &len);
        if (status != APR_SUCCESS && status != APR_EOF) {
            apr_status_t lcl_status;

            apr_file_close(inf);
            apr_file_close(outf);

            if ((lcl_status = apr_file_remove(dst, p)) != APR_SUCCESS) {
                /* ### ACK! Inconsistent state... */

                /* ### use something besides 500? */
                return dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 0, 
                                     lcl_status,
                                     "Could not delete output after read "
                                     "failure. Server is now in an "
                                     "inconsistent state.");
            }

            /* ### use something besides 500? */
            return dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 0, status,
                                 "Could not read input file");
        }

        if (status == APR_EOF)
            break;

        /* write any bytes that were read */
        status = apr_file_write_full(outf, pbuf->buf, len, NULL);
        if (status != APR_SUCCESS) {
            apr_status_t lcl_status;

            apr_file_close(inf);
            apr_file_close(outf);

            if ((lcl_status = apr_file_remove(dst, p)) != APR_SUCCESS) {
                /* ### ACK! Inconsistent state... */

                /* ### use something besides 500? */
                return dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 0,
                                     lcl_status,
                                     "Could not delete output after write "
                                     "failure. Server is now in an "
                                     "inconsistent state.");
            }

            return dav_new_error(p, MAP_IO2HTTP(status), 0, status,
                                 "Could not write output file");
        }
    }

    apr_file_close(inf);
    apr_file_close(outf);

    if (is_move && (status = apr_file_remove(src, p)) != APR_SUCCESS) {
        dav_error *err;
        apr_status_t lcl_status;

        if (APR_STATUS_IS_ENOENT(status)) {
            /*
             * Something is wrong here but the result is what we wanted.
             * We definitely should not remove the destination file.
             */
            err = dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 0, status,
                                 apr_psprintf(p, "Could not remove source "
                                              "file %s after move to %s. The "
                                              "server may be in an "
                                              "inconsistent state.", src, dst));
            return err;
        } 
        else if ((lcl_status = apr_file_remove(dst, p)) != APR_SUCCESS) {
            /* ### ACK. this creates an inconsistency. do more!? */

            /* ### use something besides 500? */
            return dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 0, lcl_status,
                                 "Could not remove source or destination "
                                 "file. Server is now in an inconsistent "
                                 "state.");
        }

        /* ### use something besides 500? */
        err = dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 0, status,
                            "Could not remove source file after move. "
                            "Destination was removed to ensure consistency.");
        return err;
    }

    return NULL;
}

/* copy/move a file from within a state dir to another state dir */
/* ### need more buffers to replace the pool argument */
static dav_error * dav_fs_copymove_state(
    int is_move,
    apr_pool_t * p,
    const char *src_dir, const char *src_file,
    const char *dst_dir, const char *dst_file,
    dav_buffer *pbuf)
{
    apr_finfo_t src_finfo;        /* finfo for source file */
    apr_finfo_t dst_state_finfo;        /* finfo for STATE directory */
    apr_status_t rv;
    const char *src;
    const char *dst;

    /* build the propset pathname for the source file */
    src = apr_pstrcat(p, src_dir, "/" DAV_FS_STATE_DIR "/", src_file, NULL);

    /* the source file doesn't exist */
    rv = apr_stat(&src_finfo, src, APR_FINFO_NORM, p);
    if (rv != APR_SUCCESS && rv != APR_INCOMPLETE) {
        return NULL;
    }

    /* build the pathname for the destination state dir */
    dst = apr_pstrcat(p, dst_dir, "/" DAV_FS_STATE_DIR, NULL);

    /* ### do we need to deal with the umask? */

    /* ensure that it exists */
    rv = apr_dir_make(dst, APR_OS_DEFAULT, p);
    if (rv != APR_SUCCESS) {
        if (!APR_STATUS_IS_EEXIST(rv)) {
            /* ### use something besides 500? */
            return dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 0, rv,
                                 "Could not create internal state directory");
        }
    }

    /* get info about the state directory */
    rv = apr_stat(&dst_state_finfo, dst, APR_FINFO_NORM, p);
    if (rv != APR_SUCCESS && rv != APR_INCOMPLETE) {
        /* Ack! Where'd it go? */
        /* ### use something besides 500? */
        return dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 0, rv,
                             "State directory disappeared");
    }

    /* The mkdir() may have failed because a *file* exists there already */
    if (dst_state_finfo.filetype != APR_DIR) {
        /* ### try to recover by deleting this file? (and mkdir again) */
        /* ### use something besides 500? */
        return dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 0, 0,
                             "State directory is actually a file");
    }

    /* append the target file to the state directory pathname */
    dst = apr_pstrcat(p, dst, "/", dst_file, NULL);

    /* copy/move the file now */
    if (is_move) {
        /* try simple rename first */
        rv = apr_file_rename(src, dst, p);
        if (APR_STATUS_IS_EXDEV(rv)) {
            return dav_fs_copymove_file(is_move, p, src, dst, NULL, NULL, pbuf);
        }
        if (rv != APR_SUCCESS) {
            /* ### use something besides 500? */
            return dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 0, rv,
                                 "Could not move state file.");
        }
    }
    else
    {
        /* gotta copy (and delete) */
        return dav_fs_copymove_file(is_move, p, src, dst, NULL, NULL, pbuf);
    }

    return NULL;
}

static dav_error *dav_fs_copymoveset(int is_move, apr_pool_t *p,
                                     const dav_resource *src,
                                     const dav_resource *dst,
                                     dav_buffer *pbuf)
{
    const char *src_dir;
    const char *src_file;
    const char *src_state1;
    const char *src_state2;
    const char *dst_dir;
    const char *dst_file;
    const char *dst_state1;
    const char *dst_state2;
    dav_error *err;

    /* Get directory and filename for resources */
    /* ### should test these result values... */
    (void) dav_fs_dir_file_name(src, &src_dir, &src_file);
    (void) dav_fs_dir_file_name(dst, &dst_dir, &dst_file);

    /* Get the corresponding state files for each resource */
    dav_dbm_get_statefiles(p, src_file, &src_state1, &src_state2);
    dav_dbm_get_statefiles(p, dst_file, &dst_state1, &dst_state2);
#if DAV_DEBUG
    if ((src_state2 != NULL && dst_state2 == NULL) ||
        (src_state2 == NULL && dst_state2 != NULL)) {
        return dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 0, 0,
                             "DESIGN ERROR: dav_dbm_get_statefiles() "
                             "returned inconsistent results.");
    }
#endif

    err = dav_fs_copymove_state(is_move, p,
                                src_dir, src_state1,
                                dst_dir, dst_state1,
                                pbuf);

    if (err == NULL && src_state2 != NULL) {
        err = dav_fs_copymove_state(is_move, p,
                                    src_dir, src_state2,
                                    dst_dir, dst_state2,
                                    pbuf);

        if (err != NULL) {
            /* ### CRAP. inconsistency. */
            /* ### should perform some cleanup at the target if we still
               ### have the original files */

            /* Change the error to reflect the bad server state. */
            err->status = HTTP_INTERNAL_SERVER_ERROR;
            err->desc =
                "Could not fully copy/move the properties. "
                "The server is now in an inconsistent state.";
        }
    }

    return err;
}

static dav_error *dav_fs_deleteset(apr_pool_t *p, const dav_resource *resource)
{
    const char *dirpath;
    const char *fname;
    const char *state1;
    const char *state2;
    const char *pathname;
    apr_status_t status;

    /* Get directory, filename, and state-file names for the resource */
    /* ### should test this result value... */
    (void) dav_fs_dir_file_name(resource, &dirpath, &fname);
    dav_dbm_get_statefiles(p, fname, &state1, &state2);

    /* build the propset pathname for the file */
    pathname = apr_pstrcat(p,
                          dirpath,
                          "/" DAV_FS_STATE_DIR "/",
                          state1,
                          NULL);

    /* note: we may get ENOENT if the state dir is not present */
    if ((status = apr_file_remove(pathname, p)) != APR_SUCCESS
        && !APR_STATUS_IS_ENOENT(status)) {
        return dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 0, status,
                             "Could not remove properties.");
    }

    if (state2 != NULL) {
        /* build the propset pathname for the file */
        pathname = apr_pstrcat(p,
                              dirpath,
                              "/" DAV_FS_STATE_DIR "/",
                              state2,
                              NULL);

        if ((status = apr_file_remove(pathname, p)) != APR_SUCCESS
            && !APR_STATUS_IS_ENOENT(status)) {
            /* ### CRAP. only removed half. */
            return dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 0, status,
                                 "Could not fully remove properties. "
                                 "The server is now in an inconsistent "
                                 "state.");
        }
    }

    return NULL;
}

/* --------------------------------------------------------------------
**
** REPOSITORY HOOK FUNCTIONS
*/

static dav_error * dav_fs_get_resource(
    request_rec *r,
    const char *root_dir,
    const char *label,
    int use_checked_in,
    dav_resource **result_resource)
{
    dav_resource_private *ctx;
    dav_resource *resource;
    char *s;
    char *filename;
    apr_size_t len;

    /* ### optimize this into a single allocation! */

    /* Create private resource context descriptor */
    ctx = apr_pcalloc(r->pool, sizeof(*ctx));
    ctx->finfo = r->finfo;
    ctx->r = r;

    /* ### this should go away */
    ctx->pool = r->pool;

    /* Preserve case on OSes which fold canonical filenames */
#if 0
    /* ### not available in Apache 2.0 yet */
    filename = r->case_preserved_filename;
#else
    filename = r->filename;
#endif

    /*
    ** If there is anything in the path_info, then this indicates that the
    ** entire path was not used to specify the file/dir. We want to append
    ** it onto the filename so that we get a "valid" pathname for null
    ** resources.
    */
    s = apr_pstrcat(r->pool, filename, r->path_info, NULL);

    /* make sure the pathname does not have a trailing "/" */
    len = strlen(s);
    if (len > 1 && s[len - 1] == '/') {
        s[len - 1] = '\0';
    }
    ctx->pathname = s;

    /* Create resource descriptor */
    resource = apr_pcalloc(r->pool, sizeof(*resource));
    resource->type = DAV_RESOURCE_TYPE_REGULAR;
    resource->info = ctx;
    resource->hooks = &dav_hooks_repository_fs;
    resource->pool = r->pool;

    /* make sure the URI does not have a trailing "/" */
    len = strlen(r->uri);
    if (len > 1 && r->uri[len - 1] == '/') {
        s = apr_pstrmemdup(r->pool, r->uri, len-1);
        resource->uri = s;
    }
    else {
        resource->uri = r->uri;
    }

    if (r->finfo.filetype != APR_NOFILE) {
        resource->exists = 1;
        resource->collection = r->finfo.filetype == APR_DIR;

        /* unused info in the URL will indicate a null resource */

        if (r->path_info != NULL && *r->path_info != '\0') {
            if (resource->collection) {
                /* only a trailing "/" is allowed */
                if (*r->path_info != '/' || r->path_info[1] != '\0') {

                    /*
                    ** This URL/filename represents a locknull resource or
                    ** possibly a destination of a MOVE/COPY
                    */
                    resource->exists = 0;
                    resource->collection = 0;
                }
            }
            else
            {
                /*
                ** The base of the path refers to a file -- nothing should
                ** be in path_info. The resource is simply an error: it
                ** can't be a null or a locknull resource.
                */
                return dav_new_error(r->pool, HTTP_BAD_REQUEST, 0, 0,
                                     "The URL contains extraneous path "
                                     "components. The resource could not "
                                     "be identified.");
            }

            /* retain proper integrity across the structures */
            if (!resource->exists) {
                ctx->finfo.filetype = APR_NOFILE;
            }
        }
    }

    *result_resource = resource;
    return NULL;
}

static dav_error * dav_fs_get_parent_resource(const dav_resource *resource,
                                              dav_resource **result_parent)
{
    dav_resource_private *ctx = resource->info;
    dav_resource_private *parent_ctx;
    dav_resource *parent_resource;
    apr_status_t rv;
    char *dirpath;
    const char *testroot;
    const char *testpath;

    /* If we're at the root of the URL space, then there is no parent. */
    if (strcmp(resource->uri, "/") == 0) {
        *result_parent = NULL;
        return NULL;
    }

    /* If given resource is root, then there is no parent.
     * Unless we can retrieve the filepath root, this is
     * intendend to fail.  If we split the root and
     * no path info remains, then we also fail.
     */
    testpath = ctx->pathname;
    rv = apr_filepath_root(&testroot, &testpath, 0, ctx->pool);
    if ((rv != APR_SUCCESS && rv != APR_ERELATIVE)
        || !testpath || !*testpath) {
        *result_parent = NULL;
        return NULL;
    }

    /* ### optimize this into a single allocation! */

    /* Create private resource context descriptor */
    parent_ctx = apr_pcalloc(ctx->pool, sizeof(*parent_ctx));

    /* ### this should go away */
    parent_ctx->pool = ctx->pool;

    dirpath = ap_make_dirstr_parent(ctx->pool, ctx->pathname);
    if (strlen(dirpath) > 1 && dirpath[strlen(dirpath) - 1] == '/')
        dirpath[strlen(dirpath) - 1] = '\0';
    parent_ctx->pathname = dirpath;

    parent_resource = apr_pcalloc(ctx->pool, sizeof(*parent_resource));
    parent_resource->info = parent_ctx;
    parent_resource->collection = 1;
    parent_resource->hooks = &dav_hooks_repository_fs;
    parent_resource->pool = resource->pool;

    if (resource->uri != NULL) {
        char *uri = ap_make_dirstr_parent(ctx->pool, resource->uri);
        if (strlen(uri) > 1 && uri[strlen(uri) - 1] == '/')
            uri[strlen(uri) - 1] = '\0';
        parent_resource->uri = uri;
    }

    rv = apr_stat(&parent_ctx->finfo, parent_ctx->pathname,
                  APR_FINFO_NORM, ctx->pool);
    if (rv == APR_SUCCESS || rv == APR_INCOMPLETE) {
        parent_resource->exists = 1;
    }

    *result_parent = parent_resource;
    return NULL;
}

static int dav_fs_is_same_resource(
    const dav_resource *res1,
    const dav_resource *res2)
{
    dav_resource_private *ctx1 = res1->info;
    dav_resource_private *ctx2 = res2->info;

    if (res1->hooks != res2->hooks)
        return 0;

    if ((ctx1->finfo.filetype != APR_NOFILE) && (ctx2->finfo.filetype != APR_NOFILE)
        && (ctx1->finfo.valid & ctx2->finfo.valid & APR_FINFO_INODE)) {
        return ctx1->finfo.inode == ctx2->finfo.inode;
    }
    else {
        return strcmp(ctx1->pathname, ctx2->pathname) == 0;
    }
}

static int dav_fs_is_parent_resource(
    const dav_resource *res1,
    const dav_resource *res2)
{
    dav_resource_private *ctx1 = res1->info;
    dav_resource_private *ctx2 = res2->info;
    apr_size_t len1 = strlen(ctx1->pathname);
    apr_size_t len2;

    if (res1->hooks != res2->hooks)
        return 0;

    /* it is safe to use ctx2 now */
    len2 = strlen(ctx2->pathname);

    return (len2 > len1
            && memcmp(ctx1->pathname, ctx2->pathname, len1) == 0
            && ctx2->pathname[len1] == '/');
}

static apr_status_t tmpfile_cleanup(void *data) {
        dav_stream *ds = data;
        if (ds->temppath) {
                apr_file_remove(ds->temppath, ds->p);
        }
        return APR_SUCCESS;
}

/* custom mktemp that creates the file with APR_OS_DEFAULT permissions */
static apr_status_t dav_fs_mktemp(apr_file_t **fp, char *templ, apr_pool_t *p)
{
    apr_status_t rv;
    int num = ((getpid() << 7) + (apr_uintptr_t)templ % (1 << 16) ) %
               ( 1 << 23 ) ;
    char *numstr = templ + strlen(templ) - 6;

    ap_assert(numstr >= templ);

    do {
        num = (num + 1) % ( 1 << 23 );
        apr_snprintf(numstr, 7, "%06x", num);
        rv = apr_file_open(fp, templ,
                           APR_WRITE | APR_CREATE | APR_BINARY | APR_EXCL,
                           APR_OS_DEFAULT, p);
    } while (APR_STATUS_IS_EEXIST(rv));
        
    return rv;
}

static dav_error * dav_fs_open_stream(const dav_resource *resource,
                                      dav_stream_mode mode,
                                      dav_stream **stream)
{
    apr_pool_t *p = resource->info->pool;
    dav_stream *ds = apr_pcalloc(p, sizeof(*ds));
    apr_int32_t flags;
    apr_status_t rv;

    switch (mode) {
    default:
        flags = APR_READ | APR_BINARY;
        break;

    case DAV_MODE_WRITE_TRUNC:
        flags = APR_WRITE | APR_CREATE | APR_TRUNCATE | APR_BINARY;
        break;
    case DAV_MODE_WRITE_SEEKABLE:
        flags = APR_WRITE | APR_CREATE | APR_BINARY;
        break;
    }

    ds->p = p;
    ds->pathname = resource->info->pathname;
    ds->temppath = NULL;
    ds->unlink_on_error = 0;

    if (mode == DAV_MODE_WRITE_TRUNC) {
        ds->temppath = apr_pstrcat(p, ap_make_dirstr_parent(p, ds->pathname),
                                   DAV_FS_TMP_PREFIX "XXXXXX", NULL);
        rv = dav_fs_mktemp(&ds->f, ds->temppath, ds->p);
        apr_pool_cleanup_register(p, ds, tmpfile_cleanup,
                                  apr_pool_cleanup_null);
    }
    else if (mode == DAV_MODE_WRITE_SEEKABLE) {
        rv = apr_file_open(&ds->f, ds->pathname, flags | APR_FOPEN_EXCL,
                           APR_OS_DEFAULT, ds->p);
        if (rv == APR_SUCCESS) {
            /* we have created a new file */
            ds->unlink_on_error = 1;
        }
        else if (APR_STATUS_IS_EEXIST(rv)) {
            rv = apr_file_open(&ds->f, ds->pathname, flags, APR_OS_DEFAULT,
                               ds->p);
        }
    }
    else {
        rv = apr_file_open(&ds->f, ds->pathname, flags, APR_OS_DEFAULT, ds->p);
    }

    if (rv != APR_SUCCESS) {
        return dav_new_error(p, MAP_IO2HTTP(rv), 0, rv,
                             "An error occurred while opening a resource.");
    }

    /* (APR registers cleanups for the fd with the pool) */

    *stream = ds;
    return NULL;
}

static dav_error * dav_fs_close_stream(dav_stream *stream, int commit)
{
    apr_status_t rv;

    apr_file_close(stream->f);

    if (!commit) {
        if (stream->temppath) {
            apr_pool_cleanup_run(stream->p, stream, tmpfile_cleanup);
        }
        else if (stream->unlink_on_error) {
            if ((rv = apr_file_remove(stream->pathname, stream->p))
                != APR_SUCCESS) {
                /* ### use a better description? */
                return dav_new_error(stream->p, HTTP_INTERNAL_SERVER_ERROR, 0,
                                     rv,
                                     "There was a problem removing (rolling "
                                     "back) the resource "
                                     "when it was being closed.");
            }
        }
    }
    else if (stream->temppath) {
        rv = apr_file_rename(stream->temppath, stream->pathname, stream->p);
        if (rv) {
            return dav_new_error(stream->p, HTTP_INTERNAL_SERVER_ERROR, 0, rv,
                                 "There was a problem writing the file "
                                 "atomically after writes.");
        }
        apr_pool_cleanup_kill(stream->p, stream, tmpfile_cleanup);
    }

    return NULL;
}

static dav_error * dav_fs_write_stream(dav_stream *stream,
                                       const void *buf, apr_size_t bufsize)
{
    apr_status_t status;

    status = apr_file_write_full(stream->f, buf, bufsize, NULL);
    if (APR_STATUS_IS_ENOSPC(status)) {
        return dav_new_error(stream->p, HTTP_INSUFFICIENT_STORAGE, 0, status,
                             "There is not enough storage to write to "
                             "this resource.");
    }
    else if (status != APR_SUCCESS) {
        /* ### use something besides 500? */
        return dav_new_error(stream->p, HTTP_INTERNAL_SERVER_ERROR, 0, status,
                             "An error occurred while writing to a "
                             "resource.");
    }
    return NULL;
}

static dav_error * dav_fs_seek_stream(dav_stream *stream, apr_off_t abs_pos)
{
    apr_status_t status;

    if ((status = apr_file_seek(stream->f, APR_SET, &abs_pos))
        != APR_SUCCESS) {
        /* ### should check whether apr_file_seek set abs_pos was set to the
         * correct position? */
        /* ### use something besides 500? */
        return dav_new_error(stream->p, HTTP_INTERNAL_SERVER_ERROR, 0, status,
                             "Could not seek to specified position in the "
                             "resource.");
    }
    return NULL;
}


#if DEBUG_GET_HANDLER

/* only define set_headers() and deliver() for debug purposes */


static dav_error * dav_fs_set_headers(request_rec *r,
                                      const dav_resource *resource)
{
    /* ### this function isn't really used since we have a get_pathname */
    if (!resource->exists)
        return NULL;

    /* make sure the proper mtime is in the request record */
    ap_update_mtime(r, resource->info->finfo.mtime);

    /* ### note that these use r->filename rather than <resource> */
    ap_set_last_modified(r);
    ap_set_etag(r);

    /* we accept byte-ranges */
    ap_set_accept_ranges(r);

    /* set up the Content-Length header */
    ap_set_content_length(r, resource->info->finfo.size);

    /* ### how to set the content type? */
    /* ### until this is resolved, the Content-Type header is busted */

    return NULL;
}

static dav_error * dav_fs_deliver(const dav_resource *resource,
                                  ap_filter_t *output)
{
    apr_pool_t *pool = resource->pool;
    apr_bucket_brigade *bb;
    apr_file_t *fd;
    apr_status_t status;
    apr_bucket *bkt;

    /* Check resource type */
    if (resource->type != DAV_RESOURCE_TYPE_REGULAR
        && resource->type != DAV_RESOURCE_TYPE_VERSION
        && resource->type != DAV_RESOURCE_TYPE_WORKING) {
        return dav_new_error(pool, HTTP_CONFLICT, 0, 0,
                             "Cannot GET this type of resource.");
    }
    if (resource->collection) {
        return dav_new_error(pool, HTTP_CONFLICT, 0, 0,
                             "There is no default response to GET for a "
                             "collection.");
    }

    if ((status = apr_file_open(&fd, resource->info->pathname,
                                APR_READ | APR_BINARY, 0,
                                pool)) != APR_SUCCESS) {
        return dav_new_error(pool, HTTP_FORBIDDEN, 0, status,
                             "File permissions deny server access.");
    }

    bb = apr_brigade_create(pool, output->c->bucket_alloc);

    apr_brigade_insert_file(bb, fd, 0, resource->info->finfo.size, pool);

    bkt = apr_bucket_eos_create(output->c->bucket_alloc);
    APR_BRIGADE_INSERT_TAIL(bb, bkt);

    if ((status = ap_pass_brigade(output, bb)) != APR_SUCCESS) {
        return dav_new_error(pool, HTTP_FORBIDDEN, 0, status,
                             "Could not write contents to filter.");
    }

    return NULL;
}

#endif /* DEBUG_GET_HANDLER */


static dav_error * dav_fs_create_collection(dav_resource *resource)
{
    dav_resource_private *ctx = resource->info;
    apr_status_t status;

    status = apr_dir_make(ctx->pathname, APR_OS_DEFAULT, ctx->pool);
    if (APR_STATUS_IS_ENOSPC(status)) {
        return dav_new_error(ctx->pool, HTTP_INSUFFICIENT_STORAGE, 0, status,
                             "There is not enough storage to create "
                             "this collection.");
    }
    else if (APR_STATUS_IS_ENOENT(status)) {
        return dav_new_error(ctx->pool, HTTP_CONFLICT, 0, status,
                             "Cannot create collection; intermediate "
                             "collection does not exist.");
    }
    else if (status != APR_SUCCESS) {
        /* ### refine this error message? */
        return dav_new_error(ctx->pool, HTTP_FORBIDDEN, 0, status,
                             "Unable to create collection.");
    }

    /* update resource state to show it exists as a collection */
    resource->exists = 1;
    resource->collection = 1;

    return NULL;
}

static dav_error * dav_fs_copymove_walker(dav_walk_resource *wres,
                                          int calltype)
{
    apr_status_t status;
    dav_fs_copymove_walk_ctx *ctx = wres->walk_ctx;
    dav_resource_private *srcinfo = wres->resource->info;
    dav_resource_private *dstinfo = ctx->res_dst->info;
    dav_error *err = NULL;

    if (wres->resource->collection) {
        if (calltype == DAV_CALLTYPE_POSTFIX) {
            /* Postfix call for MOVE. delete the source dir.
             * Note: when copying, we do not enable the postfix-traversal.
             */
            /* ### we are ignoring any error here; what should we do? */
            (void) apr_dir_remove(srcinfo->pathname, ctx->pool);
        }
        else {
            /* copy/move of a collection. Create the new, target collection */
            if ((status = apr_dir_make(dstinfo->pathname, APR_OS_DEFAULT,
                                       ctx->pool)) != APR_SUCCESS) {
                /* ### assume it was a permissions problem */
                /* ### need a description here */
                err = dav_new_error(ctx->pool, HTTP_FORBIDDEN, 0, status, NULL);
            }
        }
    }
    else {
        err = dav_fs_copymove_file(ctx->is_move, ctx->pool,
                                   srcinfo->pathname, dstinfo->pathname,
                                   &srcinfo->finfo,
                                   ctx->res_dst->exists ? &dstinfo->finfo : NULL,
                                   &ctx->work_buf);
        /* ### push a higher-level description? */
    }

    /*
    ** If we have a "not so bad" error, then it might need to go into a
    ** multistatus response.
    **
    ** For a MOVE, it will always go into the multistatus. It could be
    ** that everything has been moved *except* for the root. Using a
    ** multistatus (with no errors for the other resources) will signify
    ** this condition.
    **
    ** For a COPY, we are traversing in a prefix fashion. If the root fails,
    ** then we can just bail out now.
    */
    if (err != NULL
        && !ap_is_HTTP_SERVER_ERROR(err->status)
        && (ctx->is_move
            || !dav_fs_is_same_resource(wres->resource, ctx->root))) {
        /* ### use errno to generate DAV:responsedescription? */
        dav_add_response(wres, err->status, NULL);

        /* the error is in the multistatus now. do not stop the traversal. */
        return NULL;
    }

    return err;
}

static dav_error *dav_fs_copymove_resource(
    int is_move,
    const dav_resource *src,
    const dav_resource *dst,
    int depth,
    dav_response **response)
{
    dav_error *err = NULL;
    dav_buffer work_buf = { 0 };

    *response = NULL;

    /* if a collection, recursively copy/move it and its children,
     * including the state dirs
     */
    if (src->collection) {
        dav_walk_params params = { 0 };
        dav_response *multi_status;

        params.walk_type = DAV_WALKTYPE_NORMAL | DAV_WALKTYPE_HIDDEN;
        params.func = dav_fs_copymove_walker;
        params.pool = src->info->pool;
        params.root = src;

        /* params.walk_ctx is managed by dav_fs_internal_walk() */

        /* postfix is needed for MOVE to delete source dirs */
        if (is_move)
            params.walk_type |= DAV_WALKTYPE_POSTFIX;

        /* note that we return the error OR the multistatus. never both */

        if ((err = dav_fs_internal_walk(&params, depth, is_move, dst,
                                        &multi_status)) != NULL) {
            /* on a "real" error, then just punt. nothing else to do. */
            return err;
        }

        if ((*response = multi_status) != NULL) {
            /* some multistatus responses exist. wrap them in a 207 */
            return dav_new_error(src->info->pool, HTTP_MULTI_STATUS, 0, 0,
                                 "Error(s) occurred on some resources during "
                                 "the COPY/MOVE process.");
        }

        return NULL;
    }

    /* not a collection */
    if ((err = dav_fs_copymove_file(is_move, src->info->pool,
                                    src->info->pathname, dst->info->pathname,
                                    &src->info->finfo,
                                    dst->exists ? &dst->info->finfo : NULL,
                                    &work_buf)) != NULL) {
        /* ### push a higher-level description? */
        return err;
    }

    /* copy/move properties as well */
    return dav_fs_copymoveset(is_move, src->info->pool, src, dst, &work_buf);
}

static dav_error * dav_fs_copy_resource(
    const dav_resource *src,
    dav_resource *dst,
    int depth,
    dav_response **response)
{
    dav_error *err;

#if DAV_DEBUG
    if (src->hooks != dst->hooks) {
        /*
        ** ### strictly speaking, this is a design error; we should not
        ** ### have reached this point.
        */
        return dav_new_error(src->info->pool, HTTP_INTERNAL_SERVER_ERROR, 0, 0,
                             "DESIGN ERROR: a mix of repositories "
                             "was passed to copy_resource.");
    }
#endif

    if ((err = dav_fs_copymove_resource(0, src, dst, depth,
                                        response)) == NULL) {

        /* update state of destination resource to show it exists */
        dst->exists = 1;
        dst->collection = src->collection;
    }

    return err;
}

static dav_error * dav_fs_move_resource(
    dav_resource *src,
    dav_resource *dst,
    dav_response **response)
{
    dav_resource_private *srcinfo = src->info;
    dav_resource_private *dstinfo = dst->info;
    dav_error *err;
    apr_status_t rv;

#if DAV_DEBUG
    if (src->hooks != dst->hooks) {
        /*
        ** ### strictly speaking, this is a design error; we should not
        ** ### have reached this point.
        */
        return dav_new_error(src->info->pool, HTTP_INTERNAL_SERVER_ERROR, 0, 0,
                             "DESIGN ERROR: a mix of repositories "
                             "was passed to move_resource.");
    }
#endif


    /* try rename first */
    rv = apr_file_rename(srcinfo->pathname, dstinfo->pathname, srcinfo->pool);

    /* if we can't simply rename, then do it the hard way... */
    if (APR_STATUS_IS_EXDEV(rv)) {
        if ((err = dav_fs_copymove_resource(1, src, dst, DAV_INFINITY,
                                            response)) == NULL) {
            /* update resource states */
            dst->exists = 1;
            dst->collection = src->collection;
            src->exists = 0;
            src->collection = 0;
        }

        return err;
    }

    /* no multistatus response */
    *response = NULL;

    if (rv != APR_SUCCESS) {
        /* ### should have a better error than this. */
        return dav_new_error(srcinfo->pool, HTTP_INTERNAL_SERVER_ERROR, 0, rv,
                             "Could not rename resource.");
    }

    /* Rename did work. Update resource states and move properties as well */
    dst->exists = 1;
    dst->collection = src->collection;
    src->exists = 0;
    src->collection = 0;

    if ((err = dav_fs_copymoveset(1, src->info->pool,
                                  src, dst, NULL)) == NULL) {
        /* no error. we're done. go ahead and return now. */
        return NULL;
    }

    /* error occurred during properties move; try to put resource back */
    if (apr_file_rename(dstinfo->pathname, srcinfo->pathname,
                       srcinfo->pool) != APR_SUCCESS) {
        /* couldn't put it back! */
        return dav_push_error(srcinfo->pool,
                              HTTP_INTERNAL_SERVER_ERROR, 0,
                              "The resource was moved, but a failure "
                              "occurred during the move of its "
                              "properties. The resource could not be "
                              "restored to its original location. The "
                              "server is now in an inconsistent state.",
                              err);
    }

    /* update resource states again */
    src->exists = 1;
    src->collection = dst->collection;
    dst->exists = 0;
    dst->collection = 0;

    /* resource moved back, but properties may be inconsistent */
    return dav_push_error(srcinfo->pool,
                          HTTP_INTERNAL_SERVER_ERROR, 0,
                          "The resource was moved, but a failure "
                          "occurred during the move of its properties. "
                          "The resource was moved back to its original "
                          "location, but its properties may have been "
                          "partially moved. The server may be in an "
                          "inconsistent state.",
                          err);
}

static dav_error * dav_fs_delete_walker(dav_walk_resource *wres, int calltype)
{
    dav_resource_private *info = wres->resource->info;

    /* do not attempt to remove a null resource,
     * or a collection with children
     */
    if (wres->resource->exists &&
        (!wres->resource->collection || calltype == DAV_CALLTYPE_POSTFIX)) {
        /* try to remove the resource */
        apr_status_t result;

        result = wres->resource->collection
            ? apr_dir_remove(info->pathname, wres->pool)
            : apr_file_remove(info->pathname, wres->pool);

        /*
        ** If an error occurred, then add it to multistatus response.
        ** Note that we add it for the root resource, too. It is quite
        ** possible to delete the whole darn tree, yet fail on the root.
        **
        ** (also: remember we are deleting via a postfix traversal)
        */
        if (result != APR_SUCCESS) {
            /* ### assume there is a permissions problem */

            /* ### use errno to generate DAV:responsedescription? */
            dav_add_response(wres, HTTP_FORBIDDEN, NULL);
        }
    }

    return NULL;
}

static dav_error * dav_fs_remove_resource(dav_resource *resource,
                                          dav_response **response)
{
    apr_status_t status;
    dav_resource_private *info = resource->info;

    *response = NULL;

    /* if a collection, recursively remove it and its children,
     * including the state dirs
     */
    if (resource->collection) {
        dav_walk_params params = { 0 };
        dav_error *err = NULL;
        dav_response *multi_status;

        params.walk_type = (DAV_WALKTYPE_NORMAL
                            | DAV_WALKTYPE_HIDDEN
                            | DAV_WALKTYPE_POSTFIX);
        params.func = dav_fs_delete_walker;
        params.pool = info->pool;
        params.root = resource;

        if ((err = dav_fs_walk(&params, DAV_INFINITY,
                               &multi_status)) != NULL) {
            /* on a "real" error, then just punt. nothing else to do. */
            return err;
        }

        if ((*response = multi_status) != NULL) {
            /* some multistatus responses exist. wrap them in a 207 */
            return dav_new_error(info->pool, HTTP_MULTI_STATUS, 0, 0,
                                 "Error(s) occurred on some resources during "
                                 "the deletion process.");
        }

        /* no errors... update resource state */
        resource->exists = 0;
        resource->collection = 0;

        return NULL;
    }

    /* not a collection; remove the file and its properties */
    if ((status = apr_file_remove(info->pathname, info->pool)) != APR_SUCCESS) {
        /* ### put a description in here */
        return dav_new_error(info->pool, HTTP_FORBIDDEN, 0, status, NULL);
    }

    /* update resource state */
    resource->exists = 0;
    resource->collection = 0;

    /* remove properties and return its result */
    return dav_fs_deleteset(info->pool, resource);
}

/* ### move this to dav_util? */
/* Walk recursively down through directories, *
 * including lock-null resources as we go.    */
static dav_error * dav_fs_walker(dav_fs_walker_context *fsctx, int depth)
{
    const dav_walk_params *params = fsctx->params;
    apr_pool_t *pool = params->pool;
    apr_status_t status;
    dav_error *err = NULL;
    int isdir = fsctx->res1.collection;
    apr_finfo_t dirent;
    apr_dir_t *dirp;

    /* ensure the context is prepared properly, then call the func */
    err = (*params->func)(&fsctx->wres,
                          isdir
                          ? DAV_CALLTYPE_COLLECTION
                          : DAV_CALLTYPE_MEMBER);
    if (err != NULL) {
        return err;
    }

    if (depth == 0 || !isdir) {
        return NULL;
    }

    /* put a trailing slash onto the directory, in preparation for appending
     * files to it as we discovery them within the directory */
    dav_check_bufsize(pool, &fsctx->path1, DAV_BUFFER_PAD);
    fsctx->path1.buf[fsctx->path1.cur_len++] = '/';
    fsctx->path1.buf[fsctx->path1.cur_len] = '\0';        /* in pad area */

    /* if a secondary path is present, then do that, too */
    if (fsctx->path2.buf != NULL) {
        dav_check_bufsize(pool, &fsctx->path2, DAV_BUFFER_PAD);
        fsctx->path2.buf[fsctx->path2.cur_len++] = '/';
        fsctx->path2.buf[fsctx->path2.cur_len] = '\0';        /* in pad area */
    }

    /* Note: the URI should ALREADY have a trailing "/" */

    /* for this first pass of files, all resources exist */
    fsctx->res1.exists = 1;

    /* a file is the default; we'll adjust if we hit a directory */
    fsctx->res1.collection = 0;
    fsctx->res2.collection = 0;

    /* open and scan the directory */
    if ((status = apr_dir_open(&dirp, fsctx->path1.buf, pool)) != APR_SUCCESS) {
        /* ### need a better error */
        return dav_new_error(pool, HTTP_NOT_FOUND, 0, status, NULL);
    }
    while ((apr_dir_read(&dirent, APR_FINFO_DIRENT, dirp)) == APR_SUCCESS) {
        apr_size_t len;

        len = strlen(dirent.name);

        /* avoid recursing into our current, parent, or state directories */
        if (dirent.name[0] == '.'
              && (len == 1 || (dirent.name[1] == '.' && len == 2))) {
            continue;
        }

        if (params->walk_type & DAV_WALKTYPE_AUTH) {
            /* ### need to authorize each file */
            /* ### example: .htaccess is normally configured to fail auth */

            /* stuff in the state directory and temp files are never authorized! */
            if (!strcmp(dirent.name, DAV_FS_STATE_DIR) ||
                !strncmp(dirent.name, DAV_FS_TMP_PREFIX,
                         strlen(DAV_FS_TMP_PREFIX))) {
                continue;
            }
        }
        /* skip the state dir and temp files unless a HIDDEN is performed */
        if (!(params->walk_type & DAV_WALKTYPE_HIDDEN)
            && (!strcmp(dirent.name, DAV_FS_STATE_DIR) ||
                !strncmp(dirent.name, DAV_FS_TMP_PREFIX,
                         strlen(DAV_FS_TMP_PREFIX)))) {
            continue;
        }

        /* append this file onto the path buffer (copy null term) */
        dav_buffer_place_mem(pool, &fsctx->path1, dirent.name, len + 1, 0);

        status = apr_stat(&fsctx->info1.finfo, fsctx->path1.buf,
                          DAV_FINFO_MASK, pool);
        if (status != APR_SUCCESS && status != APR_INCOMPLETE) {
            /* woah! where'd it go? */
            /* ### should have a better error here */
            err = dav_new_error(pool, HTTP_NOT_FOUND, 0, status, NULL);
            break;
        }

        /* copy the file to the URI, too. NOTE: we will pad an extra byte
           for the trailing slash later. */
        dav_buffer_place_mem(pool, &fsctx->uri_buf, dirent.name, len + 1, 1);

        /* if there is a secondary path, then do that, too */
        if (fsctx->path2.buf != NULL) {
            dav_buffer_place_mem(pool, &fsctx->path2, dirent.name, len + 1, 0);
        }

        /* set up the (internal) pathnames for the two resources */
        fsctx->info1.pathname = fsctx->path1.buf;
        fsctx->info2.pathname = fsctx->path2.buf;

        /* set up the URI for the current resource */
        fsctx->res1.uri = fsctx->uri_buf.buf;

        /* ### for now, only process regular files (e.g. skip symlinks) */
        if (fsctx->info1.finfo.filetype == APR_REG) {
            /* call the function for the specified dir + file */
            if ((err = (*params->func)(&fsctx->wres,
                                       DAV_CALLTYPE_MEMBER)) != NULL) {
                /* ### maybe add a higher-level description? */
                break;
            }
        }
        else if (fsctx->info1.finfo.filetype == APR_DIR) {
            apr_size_t save_path_len = fsctx->path1.cur_len;
            apr_size_t save_uri_len = fsctx->uri_buf.cur_len;
            apr_size_t save_path2_len = fsctx->path2.cur_len;

            /* adjust length to incorporate the subdir name */
            fsctx->path1.cur_len += len;
            fsctx->path2.cur_len += len;

            /* adjust URI length to incorporate subdir and a slash */
            fsctx->uri_buf.cur_len += len + 1;
            fsctx->uri_buf.buf[fsctx->uri_buf.cur_len - 1] = '/';
            fsctx->uri_buf.buf[fsctx->uri_buf.cur_len] = '\0';

            /* switch over to a collection */
            fsctx->res1.collection = 1;
            fsctx->res2.collection = 1;

            /* recurse on the subdir */
            /* ### don't always want to quit on error from single child */
            if ((err = dav_fs_walker(fsctx, depth - 1)) != NULL) {
                /* ### maybe add a higher-level description? */
                break;
            }

            /* put the various information back */
            fsctx->path1.cur_len = save_path_len;
            fsctx->path2.cur_len = save_path2_len;
            fsctx->uri_buf.cur_len = save_uri_len;

            fsctx->res1.collection = 0;
            fsctx->res2.collection = 0;

            /* assert: res1.exists == 1 */
        }
    }

    /* ### check the return value of this? */
    apr_dir_close(dirp);

    if (err != NULL)
        return err;

    if (params->walk_type & DAV_WALKTYPE_LOCKNULL) {
        apr_size_t offset = 0;

        /* null terminate the directory name */
        fsctx->path1.buf[fsctx->path1.cur_len - 1] = '\0';

        /* Include any lock null resources found in this collection */
        fsctx->res1.collection = 1;
        if ((err = dav_fs_get_locknull_members(&fsctx->res1,
                                               &fsctx->locknull_buf)) != NULL) {
            /* ### maybe add a higher-level description? */
            return err;
        }

        /* put a slash back on the end of the directory */
        fsctx->path1.buf[fsctx->path1.cur_len - 1] = '/';

        /* these are all non-existant (files) */
        fsctx->res1.exists = 0;
        fsctx->res1.collection = 0;
        memset(&fsctx->info1.finfo, 0, sizeof(fsctx->info1.finfo));

        while (offset < fsctx->locknull_buf.cur_len) {
            apr_size_t len = strlen(fsctx->locknull_buf.buf + offset);
            dav_lock *locks = NULL;

            /*
            ** Append the locknull file to the paths and the URI. Note that
            ** we don't have to pad the URI for a slash since a locknull
            ** resource is not a collection.
            */
            dav_buffer_place_mem(pool, &fsctx->path1,
                                 fsctx->locknull_buf.buf + offset, len + 1, 0);
            dav_buffer_place_mem(pool, &fsctx->uri_buf,
                                 fsctx->locknull_buf.buf + offset, len + 1, 0);
            if (fsctx->path2.buf != NULL) {
                dav_buffer_place_mem(pool, &fsctx->path2,
                                     fsctx->locknull_buf.buf + offset,
                                     len + 1, 0);
            }

            /* set up the (internal) pathnames for the two resources */
            fsctx->info1.pathname = fsctx->path1.buf;
            fsctx->info2.pathname = fsctx->path2.buf;

            /* set up the URI for the current resource */
            fsctx->res1.uri = fsctx->uri_buf.buf;

            /*
            ** To prevent a PROPFIND showing an expired locknull
            ** resource, query the lock database to force removal
            ** of both the lock entry and .locknull, if necessary..
            ** Sure, the query in PROPFIND would do this.. after
            ** the locknull resource was already included in the
            ** return.
            **
            ** NOTE: we assume the caller has opened the lock database
            **       if they have provided DAV_WALKTYPE_LOCKNULL.
            */
            /* ### we should also look into opening it read-only and
               ### eliding timed-out items from the walk, yet leaving
               ### them in the locknull database until somebody opens
               ### the thing writable.
               */
            /* ### probably ought to use has_locks. note the problem
               ### mentioned above, though... we would traverse this as
               ### a locknull, but then a PROPFIND would load the lock
               ### info, causing a timeout and the locks would not be
               ### reported. Therefore, a null resource would be returned
               ### in the PROPFIND.
               ###
               ### alternative: just load unresolved locks. any direct
               ### locks will be timed out (correct). any indirect will
               ### not (correct; consider if a parent timed out -- the
               ### timeout routines do not walk and remove indirects;
               ### even the resolve func would probably fail when it
               ### tried to find a timed-out direct lock).
            */
            if ((err = dav_lock_query(params->lockdb, &fsctx->res1,
                                      &locks)) != NULL) {
                /* ### maybe add a higher-level description? */
                return err;
            }

            /* call the function for the specified dir + file */
            if (locks != NULL &&
                (err = (*params->func)(&fsctx->wres,
                                       DAV_CALLTYPE_LOCKNULL)) != NULL) {
                /* ### maybe add a higher-level description? */
                return err;
            }

            offset += len + 1;
        }

        /* reset the exists flag */
        fsctx->res1.exists = 1;
    }

    if (params->walk_type & DAV_WALKTYPE_POSTFIX) {
        /* replace the dirs' trailing slashes with null terms */
        fsctx->path1.buf[--fsctx->path1.cur_len] = '\0';
        fsctx->uri_buf.buf[--fsctx->uri_buf.cur_len] = '\0';
        if (fsctx->path2.buf != NULL) {
            fsctx->path2.buf[--fsctx->path2.cur_len] = '\0';
        }

        /* this is a collection which exists */
        fsctx->res1.collection = 1;

        return (*params->func)(&fsctx->wres, DAV_CALLTYPE_POSTFIX);
    }

    return NULL;
}

static dav_error * dav_fs_internal_walk(const dav_walk_params *params,
                                        int depth, int is_move,
                                        const dav_resource *root_dst,
                                        dav_response **response)
{
    dav_fs_walker_context fsctx = { 0 };
    dav_error *err;
    dav_fs_copymove_walk_ctx cm_ctx = { 0 };

#if DAV_DEBUG
    if ((params->walk_type & DAV_WALKTYPE_LOCKNULL) != 0
        && params->lockdb == NULL) {
        return dav_new_error(params->pool, HTTP_INTERNAL_SERVER_ERROR, 0, 0,
                             "DESIGN ERROR: walker called to walk locknull "
                             "resources, but a lockdb was not provided.");
    }
#endif

    fsctx.params = params;
    fsctx.wres.walk_ctx = params->walk_ctx;
    fsctx.wres.pool = params->pool;

    /* ### zero out versioned, working, baselined? */

    fsctx.res1 = *params->root;
    fsctx.res1.pool = params->pool;

    fsctx.res1.info = &fsctx.info1;
    fsctx.info1 = *params->root->info;

    /* the pathname is stored in the path1 buffer */
    dav_buffer_init(params->pool, &fsctx.path1, fsctx.info1.pathname);
    fsctx.info1.pathname = fsctx.path1.buf;

    if (root_dst != NULL) {
        /* internal call from the COPY/MOVE code. set it up. */

        fsctx.wres.walk_ctx = &cm_ctx;
        cm_ctx.is_move = is_move;
        cm_ctx.res_dst = &fsctx.res2;
        cm_ctx.root = params->root;
        cm_ctx.pool = params->pool;

        fsctx.res2 = *root_dst;
        fsctx.res2.exists = 0;
        fsctx.res2.collection = 0;
        fsctx.res2.uri = NULL;          /* we don't track this */
        fsctx.res2.pool = params->pool;

        fsctx.res2.info = &fsctx.info2;
        fsctx.info2 = *root_dst->info;

        /* res2 does not exist -- clear its finfo structure */
        memset(&fsctx.info2.finfo, 0, sizeof(fsctx.info2.finfo));

        /* the pathname is stored in the path2 buffer */
        dav_buffer_init(params->pool, &fsctx.path2, fsctx.info2.pathname);
        fsctx.info2.pathname = fsctx.path2.buf;
    }

    /* prep the URI buffer */
    dav_buffer_init(params->pool, &fsctx.uri_buf, params->root->uri);

    /* if we have a directory, then ensure the URI has a trailing "/" */
    if (fsctx.res1.collection
        && fsctx.uri_buf.buf[fsctx.uri_buf.cur_len - 1] != '/') {

        /* this will fall into the pad area */
        fsctx.uri_buf.buf[fsctx.uri_buf.cur_len++] = '/';
        fsctx.uri_buf.buf[fsctx.uri_buf.cur_len] = '\0';
    }

    /* the current resource's URI is stored in the uri_buf buffer */
    fsctx.res1.uri = fsctx.uri_buf.buf;

    /* point the callback's resource at our structure */
    fsctx.wres.resource = &fsctx.res1;

    /* always return the error, and any/all multistatus responses */
    err = dav_fs_walker(&fsctx, depth);
    *response = fsctx.wres.response;
    return err;
}

static dav_error * dav_fs_walk(const dav_walk_params *params, int depth,
                               dav_response **response)
{
    /* always return the error, and any/all multistatus responses */
    return dav_fs_internal_walk(params, depth, 0, NULL, response);
}

/* dav_fs_etag:  Stolen from ap_make_etag.  Creates a strong etag
 *    for file path.
 * ### do we need to return weak tags sometimes?
 */
static const char *dav_fs_getetag(const dav_resource *resource)
{
    dav_resource_private *ctx = resource->info;

    if (!resource->exists)
        return apr_pstrdup(ctx->pool, "");

    if (ctx->finfo.filetype != APR_NOFILE) {
        return apr_psprintf(ctx->pool, "\"%" APR_UINT64_T_HEX_FMT "-%"
                            APR_UINT64_T_HEX_FMT "-%" APR_UINT64_T_HEX_FMT "\"",
                            (apr_uint64_t) ctx->finfo.inode,
                            (apr_uint64_t) ctx->finfo.size,
                            (apr_uint64_t) ctx->finfo.mtime);
    }

    return apr_psprintf(ctx->pool, "\"%" APR_UINT64_T_HEX_FMT "\"",
                       (apr_uint64_t) ctx->finfo.mtime);
}

static const dav_hooks_repository dav_hooks_repository_fs =
{
    DEBUG_GET_HANDLER,   /* normally: special GET handling not required */
    dav_fs_get_resource,
    dav_fs_get_parent_resource,
    dav_fs_is_same_resource,
    dav_fs_is_parent_resource,
    dav_fs_open_stream,
    dav_fs_close_stream,
    dav_fs_write_stream,
    dav_fs_seek_stream,
#if DEBUG_GET_HANDLER
    dav_fs_set_headers,
    dav_fs_deliver,
#else
    NULL,
    NULL,
#endif
    dav_fs_create_collection,
    dav_fs_copy_resource,
    dav_fs_move_resource,
    dav_fs_remove_resource,
    dav_fs_walk,
    dav_fs_getetag,
    NULL,
    dav_fs_get_request_rec,
    dav_fs_pathname
};

static dav_prop_insert dav_fs_insert_prop(const dav_resource *resource,
                                          int propid, dav_prop_insert what,
                                          apr_text_header *phdr)
{
    const char *value;
    const char *s;
    apr_pool_t *p = resource->info->pool;
    const dav_liveprop_spec *info;
    int global_ns;

    /* an HTTP-date can be 29 chars plus a null term */
    /* a 64-bit size can be 20 chars plus a null term */
    char buf[DAV_TIMEBUF_SIZE];

    /*
    ** None of FS provider properties are defined if the resource does not
    ** exist. Just bail for this case.
    **
    ** Even though we state that the FS properties are not defined, the
    ** client cannot store dead values -- we deny that thru the is_writable
    ** hook function.
    */
    if (!resource->exists)
        return DAV_PROP_INSERT_NOTDEF;

    switch (propid) {
    case DAV_PROPID_creationdate:
        /*
        ** Closest thing to a creation date. since we don't actually
        ** perform the operations that would modify ctime (after we
        ** create the file), then we should be pretty safe here.
        */
        dav_format_time(DAV_STYLE_ISO8601,
                        resource->info->finfo.ctime,
                        buf, sizeof(buf));
        value = buf;
        break;

    case DAV_PROPID_getcontentlength:
        /* our property, but not defined on collection resources */
        if (resource->collection)
            return DAV_PROP_INSERT_NOTDEF;

        apr_snprintf(buf, sizeof(buf), "%" APR_OFF_T_FMT, resource->info->finfo.size);
        value = buf;
        break;

    case DAV_PROPID_getetag:
        value = dav_fs_getetag(resource);
        break;

    case DAV_PROPID_getlastmodified:
        dav_format_time(DAV_STYLE_RFC822,
                        resource->info->finfo.mtime,
                        buf, sizeof(buf));
        value = buf;
        break;

    case DAV_PROPID_FS_executable:
        /* our property, but not defined on collection resources */
        if (resource->collection)
            return DAV_PROP_INSERT_NOTDEF;

        /* our property, but not defined on this platform */
        if (!(resource->info->finfo.valid & APR_FINFO_UPROT))
            return DAV_PROP_INSERT_NOTDEF;

        /* the files are "ours" so we only need to check owner exec privs */
        if (resource->info->finfo.protection & APR_UEXECUTE)
            value = "T";
        else
            value = "F";
        break;

    default:
        /* ### what the heck was this property? */
        return DAV_PROP_INSERT_NOTDEF;
    }

    /* assert: value != NULL */

    /* get the information and global NS index for the property */
    global_ns = dav_get_liveprop_info(propid, &dav_fs_liveprop_group, &info);

    /* assert: info != NULL && info->name != NULL */

    /* DBG3("FS: inserting lp%d:%s  (local %d)", ns, scan->name, scan->ns); */

    if (what == DAV_PROP_INSERT_VALUE) {
        s = apr_psprintf(p, "<lp%d:%s>%s</lp%d:%s>" DEBUG_CR,
                         global_ns, info->name, value, global_ns, info->name);
    }
    else if (what == DAV_PROP_INSERT_NAME) {
        s = apr_psprintf(p, "<lp%d:%s/>" DEBUG_CR, global_ns, info->name);
    }
    else {
        /* assert: what == DAV_PROP_INSERT_SUPPORTED */
        s = apr_psprintf(p,
                         "<D:supported-live-property D:name=\"%s\" "
                         "D:namespace=\"%s\"/>" DEBUG_CR,
                         info->name, dav_fs_namespace_uris[info->ns]);
    }
    apr_text_append(p, phdr, s);

    /* we inserted what was asked for */
    return what;
}

static int dav_fs_is_writable(const dav_resource *resource, int propid)
{
    const dav_liveprop_spec *info;

#ifdef DAV_FS_HAS_EXECUTABLE
    /* if we have the executable property, and this isn't a collection,
       then the property is writable. */
    if (propid == DAV_PROPID_FS_executable && !resource->collection)
        return 1;
#endif

    (void) dav_get_liveprop_info(propid, &dav_fs_liveprop_group, &info);
    return info->is_writable;
}

static dav_error *dav_fs_patch_validate(const dav_resource *resource,
                                        const apr_xml_elem *elem,
                                        int operation,
                                        void **context,
                                        int *defer_to_dead)
{
    const apr_text *cdata;
    const apr_text *f_cdata;
    char value;
    dav_elem_private *priv = elem->priv;

    if (priv->propid != DAV_PROPID_FS_executable) {
        *defer_to_dead = 1;
        return NULL;
    }

    if (operation == DAV_PROP_OP_DELETE) {
        return dav_new_error(resource->info->pool, HTTP_CONFLICT, 0, 0,
                             "The 'executable' property cannot be removed.");
    }

    cdata = elem->first_cdata.first;

    /* ### hmm. this isn't actually looking at all the possible text items */
    f_cdata = elem->first_child == NULL
        ? NULL
        : elem->first_child->following_cdata.first;

    /* DBG3("name=%s  cdata=%s  f_cdata=%s",elem->name,cdata ? cdata->text : "[null]",f_cdata ? f_cdata->text : "[null]"); */

    if (cdata == NULL) {
        if (f_cdata == NULL) {
            return dav_new_error(resource->info->pool, HTTP_CONFLICT, 0, 0,
                                 "The 'executable' property expects a single "
                                 "character, valued 'T' or 'F'. There was no "
                                 "value submitted.");
        }
        cdata = f_cdata;
    }
    else if (f_cdata != NULL)
        goto too_long;

    if (cdata->next != NULL || strlen(cdata->text) != 1)
        goto too_long;

    value = cdata->text[0];
    if (value != 'T' && value != 'F') {
        return dav_new_error(resource->info->pool, HTTP_CONFLICT, 0, 0,
                             "The 'executable' property expects a single "
                             "character, valued 'T' or 'F'. The value "
                             "submitted is invalid.");
    }

    *context = (void *)((long)(value == 'T'));

    return NULL;

  too_long:
    return dav_new_error(resource->info->pool, HTTP_CONFLICT, 0, 0,
                         "The 'executable' property expects a single "
                         "character, valued 'T' or 'F'. The value submitted "
                         "has too many characters.");

}

static dav_error *dav_fs_patch_exec(const dav_resource *resource,
                                    const apr_xml_elem *elem,
                                    int operation,
                                    void *context,
                                    dav_liveprop_rollback **rollback_ctx)
{
    long value = context != NULL;
    apr_fileperms_t perms = resource->info->finfo.protection;
    apr_status_t status;
    long old_value = (perms & APR_UEXECUTE) != 0;

    /* assert: prop == executable. operation == SET. */

    /* don't do anything if there is no change. no rollback info either. */
    /* DBG2("new value=%d  (old=%d)", value, old_value); */
    if (value == old_value)
        return NULL;

    perms &= ~APR_UEXECUTE;
    if (value)
        perms |= APR_UEXECUTE;

    if ((status = apr_file_perms_set(resource->info->pathname, perms))
        != APR_SUCCESS) {
        return dav_new_error(resource->info->pool,
                             HTTP_INTERNAL_SERVER_ERROR, 0, status,
                             "Could not set the executable flag of the "
                             "target resource.");
    }

    /* update the resource and set up the rollback context */
    resource->info->finfo.protection = perms;
    *rollback_ctx = (dav_liveprop_rollback *)old_value;

    return NULL;
}

static void dav_fs_patch_commit(const dav_resource *resource,
                                int operation,
                                void *context,
                                dav_liveprop_rollback *rollback_ctx)
{
    /* nothing to do */
}

static dav_error *dav_fs_patch_rollback(const dav_resource *resource,
                                        int operation,
                                        void *context,
                                        dav_liveprop_rollback *rollback_ctx)
{
    apr_fileperms_t perms = resource->info->finfo.protection & ~APR_UEXECUTE;
    apr_status_t status;
    int value = rollback_ctx != NULL;

    /* assert: prop == executable. operation == SET. */

    /* restore the executable bit */
    if (value)
        perms |= APR_UEXECUTE;

    if ((status = apr_file_perms_set(resource->info->pathname, perms))
        != APR_SUCCESS) {
        return dav_new_error(resource->info->pool,
                             HTTP_INTERNAL_SERVER_ERROR, 0, status,
                             "After a failure occurred, the resource's "
                             "executable flag could not be restored.");
    }

    /* restore the resource's state */
    resource->info->finfo.protection = perms;

    return NULL;
}


static const dav_hooks_liveprop dav_hooks_liveprop_fs =
{
    dav_fs_insert_prop,
    dav_fs_is_writable,
    dav_fs_namespace_uris,
    dav_fs_patch_validate,
    dav_fs_patch_exec,
    dav_fs_patch_commit,
    dav_fs_patch_rollback
};

static const dav_provider dav_fs_provider =
{
    &dav_hooks_repository_fs,
    &dav_hooks_db_dbm,
    &dav_hooks_locks_fs,
    NULL,               /* vsn */
    NULL,               /* binding */
    NULL,               /* search */

    NULL                /* ctx */
};

void dav_fs_gather_propsets(apr_array_header_t *uris)
{
#ifdef DAV_FS_HAS_EXECUTABLE
    *(const char **)apr_array_push(uris) =
        "<http://apache.org/dav/propset/fs/1>";
#endif
}

int dav_fs_find_liveprop(const dav_resource *resource,
                         const char *ns_uri, const char *name,
                         const dav_hooks_liveprop **hooks)
{
    /* don't try to find any liveprops if this isn't "our" resource */
    if (resource->hooks != &dav_hooks_repository_fs)
        return 0;
    return dav_do_find_liveprop(ns_uri, name, &dav_fs_liveprop_group, hooks);
}

void dav_fs_insert_all_liveprops(request_rec *r, const dav_resource *resource,
                                 dav_prop_insert what, apr_text_header *phdr)
{
    /* don't insert any liveprops if this isn't "our" resource */
    if (resource->hooks != &dav_hooks_repository_fs)
        return;

    if (!resource->exists) {
        /* a lock-null resource */
        /*
        ** ### technically, we should insert empty properties. dunno offhand
        ** ### what part of the spec said this, but it was essentially thus:
        ** ### "the properties should be defined, but may have no value".
        */
        return;
    }

    (void) dav_fs_insert_prop(resource, DAV_PROPID_creationdate,
                              what, phdr);
    (void) dav_fs_insert_prop(resource, DAV_PROPID_getcontentlength,
                              what, phdr);
    (void) dav_fs_insert_prop(resource, DAV_PROPID_getlastmodified,
                              what, phdr);
    (void) dav_fs_insert_prop(resource, DAV_PROPID_getetag,
                              what, phdr);

#ifdef DAV_FS_HAS_EXECUTABLE
    /* Only insert this property if it is defined for this platform. */
    (void) dav_fs_insert_prop(resource, DAV_PROPID_FS_executable,
                              what, phdr);
#endif

    /* ### we know the others aren't defined as liveprops */
}

void dav_fs_register(apr_pool_t *p)
{
    /* register the namespace URIs */
    dav_register_liveprop_group(p, &dav_fs_liveprop_group);

    /* register the repository provider */
    dav_register_provider(p, "filesystem", &dav_fs_provider);
}