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
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <stdio.h>
#include <sys/utsname.h>
#include <unistd.h>
#include "sd-id128.h"
#include "alloc-util.h"
#include "device-nodes.h"
#include "dropin.h"
#include "efivars.h"
#include "escape.h"
#include "fd-util.h"
#include "fileio.h"
#include "fstab-util.h"
#include "generator.h"
#include "id128-util.h"
#include "initrd-util.h"
#include "json.h"
#include "log.h"
#include "main-func.h"
#include "os-util.h"
#include "parse-util.h"
#include "path-util.h"
#include "proc-cmdline.h"
#include "special.h"
#include "string-util.h"
#include "unit-name.h"
static const char *arg_dest = NULL;
static char *arg_resume_device = NULL;
static char *arg_resume_options = NULL;
static char *arg_root_options = NULL;
static bool arg_noresume = false;
static uint64_t arg_resume_offset = 0;
static bool arg_resume_offset_set = false;
STATIC_DESTRUCTOR_REGISTER(arg_resume_device, freep);
STATIC_DESTRUCTOR_REGISTER(arg_resume_options, freep);
STATIC_DESTRUCTOR_REGISTER(arg_root_options, freep);
#if ENABLE_EFI
typedef struct EFIHibernateLocation {
sd_id128_t uuid;
uint64_t offset;
const char *kernel_version;
const char *id;
const char *image_id;
const char *version_id;
const char *image_version;
} EFIHibernateLocation;
#endif
static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
int r;
assert(key);
if (streq(key, "resume")) {
char *s;
if (proc_cmdline_value_missing(key, value))
return 0;
s = fstab_node_to_udev_node(value);
if (!s)
return log_oom();
free_and_replace(arg_resume_device, s);
} else if (proc_cmdline_key_streq(key, "resume_offset")) {
if (proc_cmdline_value_missing(key, value))
return 0;
r = safe_atou64(value, &arg_resume_offset);
if (r < 0)
return log_error_errno(r, "Failed to parse resume_offset=%s: %m", value);
arg_resume_offset_set = true;
} else if (streq(key, "resumeflags")) {
if (proc_cmdline_value_missing(key, value))
return 0;
if (!strextend_with_separator(&arg_resume_options, ",", value))
return log_oom();
} else if (streq(key, "rootflags")) {
if (proc_cmdline_value_missing(key, value))
return 0;
if (!strextend_with_separator(&arg_root_options, ",", value))
return log_oom();
} else if (streq(key, "noresume")) {
if (value) {
log_warning("\"noresume\" kernel command line switch specified with an argument, ignoring.");
return 0;
}
arg_noresume = true;
}
return 0;
}
static int parse_efi_hibernate_location(void) {
int r = 0;
#if ENABLE_EFI
static const JsonDispatch dispatch_table[] = {
{ "uuid", JSON_VARIANT_STRING, json_dispatch_id128, offsetof(EFIHibernateLocation, uuid), JSON_MANDATORY },
{ "offset", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(EFIHibernateLocation, offset), JSON_MANDATORY },
{ "kernelVersion", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(EFIHibernateLocation, kernel_version), JSON_PERMISSIVE|JSON_DEBUG },
{ "osReleaseId", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(EFIHibernateLocation, id), JSON_PERMISSIVE|JSON_DEBUG },
{ "osReleaseImageId", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(EFIHibernateLocation, image_id), JSON_PERMISSIVE|JSON_DEBUG },
{ "osReleaseVersionId", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(EFIHibernateLocation, version_id), JSON_PERMISSIVE|JSON_DEBUG },
{ "osReleaseImageVersion", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(EFIHibernateLocation, image_version), JSON_PERMISSIVE|JSON_DEBUG },
{},
};
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
_cleanup_free_ char *location_str = NULL, *device = NULL, *id = NULL, *image_id = NULL,
*version_id = NULL, *image_version = NULL;
struct utsname uts = {};
EFIHibernateLocation location = {};
r = efi_get_variable_string(EFI_SYSTEMD_VARIABLE(HibernateLocation), &location_str);
if (r == -ENOENT) {
log_debug_errno(r, "EFI variable HibernateLocation is not set, skipping.");
return 0;
}
if (r < 0)
return log_error_errno(r, "Failed to get EFI variable HibernateLocation: %m");
r = json_parse(location_str, 0, &v, NULL, NULL);
if (r < 0)
return log_error_errno(r, "Failed to parse HibernateLocation JSON object: %m");
r = json_dispatch(v, dispatch_table, NULL, JSON_LOG, &location);
if (r < 0)
return r;
if (uname(&uts) < 0)
log_warning_errno(errno, "Failed to get kernel info, ignoring: %m");
r = parse_os_release(NULL,
"ID", &id,
"IMAGE_ID", &image_id,
"VERSION_ID", &version_id,
"IMAGE_VERSION", &image_version);
if (r < 0)
log_warning_errno(r, "Failed to parse os-release, ignoring: %m");
if (!streq(uts.release, strempty(location.kernel_version)) ||
!streq_ptr(id, location.id) ||
!streq_ptr(image_id, location.image_id) ||
!streq_ptr(version_id, location.version_id) ||
!streq_ptr(image_version, location.image_version)) {
log_notice("HibernateLocation system info doesn't match with current running system, not resuming from it.");
return 0;
}
if (asprintf(&device, "/dev/disk/by-uuid/" SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(location.uuid)) < 0)
return log_oom();
if (!arg_resume_device) {
arg_resume_device = TAKE_PTR(device);
arg_resume_offset = location.offset;
} else {
if (!path_equal(arg_resume_device, device)) {
r = devnode_same(arg_resume_device, device);
if (r < 0)
log_debug_errno(r,
"Failed to check if resume=%s is the same device as HibernateLocation device '%s', ignoring: %m",
arg_resume_device, device);
if (r == 0)
log_warning("resume=%s doesn't match with HibernateLocation device '%s', proceeding anyway with resume=.",
arg_resume_device, device);
}
if (arg_resume_offset != location.offset)
log_warning("resume_offset=%" PRIu64 " doesn't match with HibernateLocation offset %" PRIu64 ", proceeding anyway with resume_offset=.",
arg_resume_offset, location.offset);
}
r = efi_set_variable(EFI_SYSTEMD_VARIABLE(HibernateLocation), NULL, 0);
if (r < 0)
log_warning_errno(r, "Failed to clear EFI variable HibernateLocation, ignoring: %m");
#endif
return r;
}
static int process_resume(void) {
_cleanup_free_ char *device_unit = NULL, *device_escaped = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
if (!arg_resume_device)
return 0;
r = unit_name_from_path(arg_resume_device, ".device", &device_unit);
if (r < 0)
return log_error_errno(r, "Failed to generate device unit name from path '%s': %m", arg_resume_device);
r = write_drop_in(arg_dest, device_unit, 40, "device-timeout",
"# Automatically generated by systemd-hibernate-resume-generator\n\n"
"[Unit]\n"
"JobTimeoutSec=infinity\n");
if (r < 0)
log_warning_errno(r, "Failed to write device timeout drop-in, ignoring: %m");
device_escaped = cescape(arg_resume_device);
if (!device_escaped)
return log_oom();
r = generator_open_unit_file(arg_dest, NULL, SPECIAL_HIBERNATE_RESUME_SERVICE, &f);
if (r < 0)
return r;
fprintf(f,
"[Unit]\n"
"Description=Resume from hibernation\n"
"Documentation=man:systemd-hibernate-resume.service(8)\n"
"DefaultDependencies=no\n"
"BindsTo=%1$s\n"
"Wants=local-fs-pre.target\n"
"After=%1$s\n"
"Before=local-fs-pre.target\n"
"AssertPathExists=/etc/initrd-release\n"
"\n"
"[Service]\n"
"Type=oneshot\n"
"ExecStart=" LIBEXECDIR "/systemd-hibernate-resume %2$s %3$" PRIu64 "\n",
device_unit,
device_escaped,
arg_resume_offset);
r = fflush_and_check(f);
if (r < 0)
return log_error_errno(r, "Failed to create " SPECIAL_HIBERNATE_RESUME_SERVICE ": %m");
r = generator_add_symlink(arg_dest, SPECIAL_SYSINIT_TARGET, "wants", SPECIAL_HIBERNATE_RESUME_SERVICE);
if (r < 0)
return r;
r = generator_write_timeouts(arg_dest,
arg_resume_device,
arg_resume_device,
arg_resume_options ?: arg_root_options,
NULL);
if (r < 0)
return r;
return 0;
}
static int run(const char *dest, const char *dest_early, const char *dest_late) {
int r;
arg_dest = ASSERT_PTR(dest);
/* Don't even consider resuming outside of initrd. */
if (!in_initrd()) {
log_debug("Not running in an initrd, exiting.");
return 0;
}
r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0);
if (r < 0)
log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
if (arg_noresume) {
log_info("Found \"noresume\" on the kernel command line, exiting.");
return 0;
}
if (!arg_resume_device && arg_resume_offset_set)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Found resume_offset=%" PRIu64 " but resume= is unset, refusing.",
arg_resume_offset);
r = parse_efi_hibernate_location();
if (r == -ENOMEM)
return r;
return process_resume();
}
DEFINE_MAIN_GENERATOR_FUNCTION(run);
|
