import: rename download code from "import" to "pull"

That way we can call the code for local container/VM imports "import"
without confusion.

1 files changed, 518 insertions, 0 deletions

diff --git a/src/import/pull-raw.c b/src/import/pull-raw.c
new file mode 100644
index 0000000000..4029c7ed17
--- /dev/null
+++ b/src/import/pull-raw.c
@@ -0,0 +1,518 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/xattr.h>
+#include <linux/fs.h>
+#include <curl/curl.h>
+
+#include "sd-daemon.h"
+#include "utf8.h"
+#include "strv.h"
+#include "copy.h"
+#include "btrfs-util.h"
+#include "util.h"
+#include "macro.h"
+#include "mkdir.h"
+#include "path-util.h"
+#include "import-util.h"
+#include "curl-util.h"
+#include "qcow2-util.h"
+#include "pull-job.h"
+#include "pull-common.h"
+#include "pull-raw.h"
+
+typedef enum RawProgress {
+        RAW_DOWNLOADING,
+        RAW_VERIFYING,
+        RAW_UNPACKING,
+        RAW_FINALIZING,
+        RAW_COPYING,
+} RawProgress;
+
+struct RawPull {
+        sd_event *event;
+        CurlGlue *glue;
+
+        char *image_root;
+
+        PullJob *raw_job;
+        PullJob *checksum_job;
+        PullJob *signature_job;
+
+        RawPullFinished on_finished;
+        void *userdata;
+
+        char *local;
+        bool force_local;
+        bool grow_machine_directory;
+
+        char *temp_path;
+        char *final_path;
+
+        ImportVerify verify;
+};
+
+RawPull* raw_pull_unref(RawPull *i) {
+        if (!i)
+                return NULL;
+
+        pull_job_unref(i->raw_job);
+        pull_job_unref(i->checksum_job);
+        pull_job_unref(i->signature_job);
+
+        curl_glue_unref(i->glue);
+        sd_event_unref(i->event);
+
+        if (i->temp_path) {
+                (void) unlink(i->temp_path);
+                free(i->temp_path);
+        }
+
+        free(i->final_path);
+        free(i->image_root);
+        free(i->local);
+        free(i);
+
+        return NULL;
+}
+
+int raw_pull_new(
+                RawPull **ret,
+                sd_event *event,
+                const char *image_root,
+                RawPullFinished on_finished,
+                void *userdata) {
+
+        _cleanup_(raw_pull_unrefp) RawPull *i = NULL;
+        int r;
+
+        assert(ret);
+
+        i = new0(RawPull, 1);
+        if (!i)
+                return -ENOMEM;
+
+        i->on_finished = on_finished;
+        i->userdata = userdata;
+
+        i->image_root = strdup(image_root ?: "/var/lib/machines");
+        if (!i->image_root)
+                return -ENOMEM;
+
+        i->grow_machine_directory = path_startswith(i->image_root, "/var/lib/machines");
+
+        if (event)
+                i->event = sd_event_ref(event);
+        else {
+                r = sd_event_default(&i->event);
+                if (r < 0)
+                        return r;
+        }
+
+        r = curl_glue_new(&i->glue, i->event);
+        if (r < 0)
+                return r;
+
+        i->glue->on_finished = pull_job_curl_on_finished;
+        i->glue->userdata = i;
+
+        *ret = i;
+        i = NULL;
+
+        return 0;
+}
+
+static void raw_pull_report_progress(RawPull *i, RawProgress p) {
+        unsigned percent;
+
+        assert(i);
+
+        switch (p) {
+
+        case RAW_DOWNLOADING: {
+                unsigned remain = 80;
+
+                percent = 0;
+
+                if (i->checksum_job) {
+                        percent += i->checksum_job->progress_percent * 5 / 100;
+                        remain -= 5;
+                }
+
+                if (i->signature_job) {
+                        percent += i->signature_job->progress_percent * 5 / 100;
+                        remain -= 5;
+                }
+
+                if (i->raw_job)
+                        percent += i->raw_job->progress_percent * remain / 100;
+                break;
+        }
+
+        case RAW_VERIFYING:
+                percent = 80;
+                break;
+
+        case RAW_UNPACKING:
+                percent = 85;
+                break;
+
+        case RAW_FINALIZING:
+                percent = 90;
+                break;
+
+        case RAW_COPYING:
+                percent = 95;
+                break;
+
+        default:
+                assert_not_reached("Unknown progress state");
+        }
+
+        sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent);
+        log_debug("Combined progress %u%%", percent);
+}
+
+static int raw_pull_maybe_convert_qcow2(RawPull *i) {
+        _cleanup_close_ int converted_fd = -1;
+        _cleanup_free_ char *t = NULL;
+        int r;
+
+        assert(i);
+        assert(i->raw_job);
+
+        r = qcow2_detect(i->raw_job->disk_fd);
+        if (r < 0)
+                return log_error_errno(r, "Failed to detect whether this is a QCOW2 image: %m");
+        if (r == 0)
+                return 0;
+
+        /* This is a QCOW2 image, let's convert it */
+        r = tempfn_random(i->final_path, &t);
+        if (r < 0)
+                return log_oom();
+
+        converted_fd = open(t, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0644);
+        if (converted_fd < 0)
+                return log_error_errno(errno, "Failed to create %s: %m", t);
+
+        r = chattr_fd(converted_fd, true, FS_NOCOW_FL);
+        if (r < 0)
+                log_warning_errno(errno, "Failed to set file attributes on %s: %m", t);
+
+        log_info("Unpacking QCOW2 file.");
+
+        r = qcow2_convert(i->raw_job->disk_fd, converted_fd);
+        if (r < 0) {
+                unlink(t);
+                return log_error_errno(r, "Failed to convert qcow2 image: %m");
+        }
+
+        unlink(i->temp_path);
+        free(i->temp_path);
+
+        i->temp_path = t;
+        t = NULL;
+
+        safe_close(i->raw_job->disk_fd);
+        i->raw_job->disk_fd = converted_fd;
+        converted_fd = -1;
+
+        return 1;
+}
+
+static int raw_pull_make_local_copy(RawPull *i) {
+        _cleanup_free_ char *tp = NULL;
+        _cleanup_close_ int dfd = -1;
+        const char *p;
+        int r;
+
+        assert(i);
+        assert(i->raw_job);
+
+        if (!i->local)
+                return 0;
+
+        if (i->raw_job->etag_exists) {
+                /* We have downloaded this one previously, reopen it */
+
+                assert(i->raw_job->disk_fd < 0);
+
+                if (!i->final_path) {
+                        r = pull_make_path(i->raw_job->url, i->raw_job->etag, i->image_root, ".raw-", ".raw", &i->final_path);
+                        if (r < 0)
+                                return log_oom();
+                }
+
+                i->raw_job->disk_fd = open(i->final_path, O_RDONLY|O_NOCTTY|O_CLOEXEC);
+                if (i->raw_job->disk_fd < 0)
+                        return log_error_errno(errno, "Failed to open vendor image: %m");
+        } else {
+                /* We freshly downloaded the image, use it */
+
+                assert(i->raw_job->disk_fd >= 0);
+
+                if (lseek(i->raw_job->disk_fd, SEEK_SET, 0) == (off_t) -1)
+                        return log_error_errno(errno, "Failed to seek to beginning of vendor image: %m");
+        }
+
+        p = strjoina(i->image_root, "/", i->local, ".raw");
+
+        if (i->force_local) {
+                (void) btrfs_subvol_remove(p);
+                (void) rm_rf_dangerous(p, false, true, false);
+        }
+
+        r = tempfn_random(p, &tp);
+        if (r < 0)
+                return log_oom();
+
+        dfd = open(tp, O_WRONLY|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664);
+        if (dfd < 0)
+                return log_error_errno(errno, "Failed to create writable copy of image: %m");
+
+        /* Turn off COW writing. This should greatly improve
+         * performance on COW file systems like btrfs, since it
+         * reduces fragmentation caused by not allowing in-place
+         * writes. */
+        r = chattr_fd(dfd, true, FS_NOCOW_FL);
+        if (r < 0)
+                log_warning_errno(errno, "Failed to set file attributes on %s: %m", tp);
+
+        r = copy_bytes(i->raw_job->disk_fd, dfd, (off_t) -1, true);
+        if (r < 0) {
+                unlink(tp);
+                return log_error_errno(r, "Failed to make writable copy of image: %m");
+        }
+
+        (void) copy_times(i->raw_job->disk_fd, dfd);
+        (void) copy_xattr(i->raw_job->disk_fd, dfd);
+
+        dfd = safe_close(dfd);
+
+        r = rename(tp, p);
+        if (r < 0)  {
+                unlink(tp);
+                return log_error_errno(errno, "Failed to move writable image into place: %m");
+        }
+
+        log_info("Created new local image '%s'.", i->local);
+        return 0;
+}
+
+static bool raw_pull_is_done(RawPull *i) {
+        assert(i);
+        assert(i->raw_job);
+
+        if (i->raw_job->state != PULL_JOB_DONE)
+                return false;
+        if (i->checksum_job && i->checksum_job->state != PULL_JOB_DONE)
+                return false;
+        if (i->signature_job && i->signature_job->state != PULL_JOB_DONE)
+                return false;
+
+        return true;
+}
+
+static void raw_pull_job_on_finished(PullJob *j) {
+        RawPull *i;
+        int r;
+
+        assert(j);
+        assert(j->userdata);
+
+        i = j->userdata;
+        if (j->error != 0) {
+                if (j == i->checksum_job)
+                        log_error_errno(j->error, "Failed to retrieve SHA256 checksum, cannot verify. (Try --verify=no?)");
+                else if (j == i->signature_job)
+                        log_error_errno(j->error, "Failed to retrieve signature file, cannot verify. (Try --verify=no?)");
+                else
+                        log_error_errno(j->error, "Failed to retrieve image file. (Wrong URL?)");
+
+                r = j->error;
+                goto finish;
+        }
+
+        /* This is invoked if either the download completed
+         * successfully, or the download was skipped because we
+         * already have the etag. In this case ->etag_exists is
+         * true.
+         *
+         * We only do something when we got all three files */
+
+        if (!raw_pull_is_done(i))
+                return;
+
+        if (!i->raw_job->etag_exists) {
+                /* This is a new download, verify it, and move it into place */
+                assert(i->raw_job->disk_fd >= 0);
+
+                raw_pull_report_progress(i, RAW_VERIFYING);
+
+                r = pull_verify(i->raw_job, i->checksum_job, i->signature_job);
+                if (r < 0)
+                        goto finish;
+
+                raw_pull_report_progress(i, RAW_UNPACKING);
+
+                r = raw_pull_maybe_convert_qcow2(i);
+                if (r < 0)
+                        goto finish;
+
+                raw_pull_report_progress(i, RAW_FINALIZING);
+
+                r = pull_make_read_only_fd(i->raw_job->disk_fd);
+                if (r < 0)
+                        goto finish;
+
+                r = rename(i->temp_path, i->final_path);
+                if (r < 0) {
+                        r = log_error_errno(errno, "Failed to move RAW file into place: %m");
+                        goto finish;
+                }
+
+                free(i->temp_path);
+                i->temp_path = NULL;
+        }
+
+        raw_pull_report_progress(i, RAW_COPYING);
+
+        r = raw_pull_make_local_copy(i);
+        if (r < 0)
+                goto finish;
+
+        r = 0;
+
+finish:
+        if (i->on_finished)
+                i->on_finished(i, r, i->userdata);
+        else
+                sd_event_exit(i->event, r);
+}
+
+static int raw_pull_job_on_open_disk(PullJob *j) {
+        RawPull *i;
+        int r;
+
+        assert(j);
+        assert(j->userdata);
+
+        i = j->userdata;
+        assert(i->raw_job == j);
+        assert(!i->final_path);
+        assert(!i->temp_path);
+
+        r = pull_make_path(j->url, j->etag, i->image_root, ".raw-", ".raw", &i->final_path);
+        if (r < 0)
+                return log_oom();
+
+        r = tempfn_random(i->final_path, &i->temp_path);
+        if (r <0)
+                return log_oom();
+
+        mkdir_parents_label(i->temp_path, 0700);
+
+        j->disk_fd = open(i->temp_path, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0644);
+        if (j->disk_fd < 0)
+                return log_error_errno(errno, "Failed to create %s: %m", i->temp_path);
+
+        r = chattr_fd(j->disk_fd, true, FS_NOCOW_FL);
+        if (r < 0)
+                log_warning_errno(errno, "Failed to set file attributes on %s: %m", i->temp_path);
+
+        return 0;
+}
+
+static void raw_pull_job_on_progress(PullJob *j) {
+        RawPull *i;
+
+        assert(j);
+        assert(j->userdata);
+
+        i = j->userdata;
+
+        raw_pull_report_progress(i, RAW_DOWNLOADING);
+}
+
+int raw_pull_start(RawPull *i, const char *url, const char *local, bool force_local, ImportVerify verify) {
+        int r;
+
+        assert(i);
+        assert(verify < _IMPORT_VERIFY_MAX);
+        assert(verify >= 0);
+
+        if (!http_url_is_valid(url))
+                return -EINVAL;
+
+        if (local && !machine_name_is_valid(local))
+                return -EINVAL;
+
+        if (i->raw_job)
+                return -EBUSY;
+
+        r = free_and_strdup(&i->local, local);
+        if (r < 0)
+                return r;
+        i->force_local = force_local;
+        i->verify = verify;
+
+        /* Queue job for the image itself */
+        r = pull_job_new(&i->raw_job, url, i->glue, i);
+        if (r < 0)
+                return r;
+
+        i->raw_job->on_finished = raw_pull_job_on_finished;
+        i->raw_job->on_open_disk = raw_pull_job_on_open_disk;
+        i->raw_job->on_progress = raw_pull_job_on_progress;
+        i->raw_job->calc_checksum = verify != IMPORT_VERIFY_NO;
+        i->raw_job->grow_machine_directory = i->grow_machine_directory;
+
+        r = pull_find_old_etags(url, i->image_root, DT_REG, ".raw-", ".raw", &i->raw_job->old_etags);
+        if (r < 0)
+                return r;
+
+        r = pull_make_verification_jobs(&i->checksum_job, &i->signature_job, verify, url, i->glue, raw_pull_job_on_finished, i);
+        if (r < 0)
+                return r;
+
+        r = pull_job_begin(i->raw_job);
+        if (r < 0)
+                return r;
+
+        if (i->checksum_job) {
+                i->checksum_job->on_progress = raw_pull_job_on_progress;
+
+                r = pull_job_begin(i->checksum_job);
+                if (r < 0)
+                        return r;
+        }
+
+        if (i->signature_job) {
+                i->signature_job->on_progress = raw_pull_job_on_progress;
+
+                r = pull_job_begin(i->signature_job);
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}