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-rw-r--r--src/import/pull-tar.c679
1 files changed, 679 insertions, 0 deletions
diff --git a/src/import/pull-tar.c b/src/import/pull-tar.c
new file mode 100644
index 0000000..fd866fc
--- /dev/null
+++ b/src/import/pull-tar.c
@@ -0,0 +1,679 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <curl/curl.h>
+#include <sys/prctl.h>
+
+#include "sd-daemon.h"
+
+#include "alloc-util.h"
+#include "btrfs-util.h"
+#include "copy.h"
+#include "curl-util.h"
+#include "fd-util.h"
+#include "fs-util.h"
+#include "hostname-util.h"
+#include "import-common.h"
+#include "import-util.h"
+#include "install-file.h"
+#include "macro.h"
+#include "mkdir-label.h"
+#include "path-util.h"
+#include "process-util.h"
+#include "pull-common.h"
+#include "pull-job.h"
+#include "pull-tar.h"
+#include "rm-rf.h"
+#include "string-util.h"
+#include "strv.h"
+#include "tmpfile-util.h"
+#include "user-util.h"
+#include "utf8.h"
+#include "util.h"
+#include "web-util.h"
+
+typedef enum TarProgress {
+ TAR_DOWNLOADING,
+ TAR_VERIFYING,
+ TAR_FINALIZING,
+ TAR_COPYING,
+} TarProgress;
+
+struct TarPull {
+ sd_event *event;
+ CurlGlue *glue;
+
+ PullFlags flags;
+ ImportVerify verify;
+ char *image_root;
+
+ PullJob *tar_job;
+ PullJob *checksum_job;
+ PullJob *signature_job;
+ PullJob *settings_job;
+
+ TarPullFinished on_finished;
+ void *userdata;
+
+ char *local;
+
+ pid_t tar_pid;
+
+ char *final_path;
+ char *temp_path;
+
+ char *settings_path;
+ char *settings_temp_path;
+
+ char *checksum;
+};
+
+TarPull* tar_pull_unref(TarPull *i) {
+ if (!i)
+ return NULL;
+
+ if (i->tar_pid > 1)
+ sigkill_wait(i->tar_pid);
+
+ pull_job_unref(i->tar_job);
+ pull_job_unref(i->checksum_job);
+ pull_job_unref(i->signature_job);
+ pull_job_unref(i->settings_job);
+
+ curl_glue_unref(i->glue);
+ sd_event_unref(i->event);
+
+ rm_rf_subvolume_and_free(i->temp_path);
+ unlink_and_free(i->settings_temp_path);
+
+ free(i->final_path);
+ free(i->settings_path);
+ free(i->image_root);
+ free(i->local);
+ free(i->checksum);
+
+ return mfree(i);
+}
+
+int tar_pull_new(
+ TarPull **ret,
+ sd_event *event,
+ const char *image_root,
+ TarPullFinished on_finished,
+ void *userdata) {
+
+ _cleanup_(curl_glue_unrefp) CurlGlue *g = NULL;
+ _cleanup_(sd_event_unrefp) sd_event *e = NULL;
+ _cleanup_(tar_pull_unrefp) TarPull *i = NULL;
+ _cleanup_free_ char *root = NULL;
+ int r;
+
+ assert(ret);
+
+ root = strdup(image_root ?: "/var/lib/machines");
+ if (!root)
+ return -ENOMEM;
+
+ if (event)
+ e = sd_event_ref(event);
+ else {
+ r = sd_event_default(&e);
+ if (r < 0)
+ return r;
+ }
+
+ r = curl_glue_new(&g, e);
+ if (r < 0)
+ return r;
+
+ i = new(TarPull, 1);
+ if (!i)
+ return -ENOMEM;
+
+ *i = (TarPull) {
+ .on_finished = on_finished,
+ .userdata = userdata,
+ .image_root = TAKE_PTR(root),
+ .event = TAKE_PTR(e),
+ .glue = TAKE_PTR(g),
+ };
+
+ i->glue->on_finished = pull_job_curl_on_finished;
+ i->glue->userdata = i;
+
+ *ret = TAKE_PTR(i);
+
+ return 0;
+}
+
+static void tar_pull_report_progress(TarPull *i, TarProgress p) {
+ unsigned percent;
+
+ assert(i);
+
+ switch (p) {
+
+ case TAR_DOWNLOADING: {
+ unsigned remain = 85;
+
+ 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->settings_job) {
+ percent += i->settings_job->progress_percent * 5 / 100;
+ remain -= 5;
+ }
+
+ if (i->tar_job)
+ percent += i->tar_job->progress_percent * remain / 100;
+ break;
+ }
+
+ case TAR_VERIFYING:
+ percent = 85;
+ break;
+
+ case TAR_FINALIZING:
+ percent = 90;
+ break;
+
+ case TAR_COPYING:
+ percent = 95;
+ break;
+
+ default:
+ assert_not_reached();
+ }
+
+ sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent);
+ log_debug("Combined progress %u%%", percent);
+}
+
+static int tar_pull_determine_path(
+ TarPull *i,
+ const char *suffix,
+ char **field /* input + output (!) */) {
+ int r;
+
+ assert(i);
+ assert(field);
+
+ if (*field)
+ return 0;
+
+ assert(i->tar_job);
+
+ r = pull_make_path(i->tar_job->url, i->tar_job->etag, i->image_root, ".tar-", suffix, field);
+ if (r < 0)
+ return log_oom();
+
+ return 1;
+}
+
+static int tar_pull_make_local_copy(TarPull *i) {
+ _cleanup_(rm_rf_subvolume_and_freep) char *t = NULL;
+ const char *p;
+ int r;
+
+ assert(i);
+ assert(i->tar_job);
+
+ if (!i->local)
+ return 0;
+
+ assert(i->final_path);
+
+ p = prefix_roota(i->image_root, i->local);
+
+ r = tempfn_random(p, NULL, &t);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate temporary filename for %s: %m", p);
+
+ if (i->flags & PULL_BTRFS_SUBVOL)
+ r = btrfs_subvol_snapshot(
+ i->final_path,
+ t,
+ (i->flags & PULL_BTRFS_QUOTA ? BTRFS_SNAPSHOT_QUOTA : 0)|
+ BTRFS_SNAPSHOT_FALLBACK_COPY|
+ BTRFS_SNAPSHOT_FALLBACK_DIRECTORY|
+ BTRFS_SNAPSHOT_RECURSIVE);
+ else
+ r = copy_tree(i->final_path, t, UID_INVALID, GID_INVALID, COPY_REFLINK|COPY_HARDLINKS);
+ if (r < 0)
+ return log_error_errno(r, "Failed to create local image: %m");
+
+ r = install_file(AT_FDCWD, t,
+ AT_FDCWD, p,
+ (i->flags & PULL_FORCE ? INSTALL_REPLACE : 0) |
+ (i->flags & PULL_READ_ONLY ? INSTALL_READ_ONLY : 0) |
+ (i->flags & PULL_SYNC ? INSTALL_SYNCFS : 0));
+ if (r < 0)
+ return log_error_errno(r, "Failed to install local image '%s': %m", p);
+
+ t = mfree(t);
+
+ log_info("Created new local image '%s'.", i->local);
+
+ if (FLAGS_SET(i->flags, PULL_SETTINGS)) {
+ const char *local_settings;
+ assert(i->settings_job);
+
+ r = tar_pull_determine_path(i, ".nspawn", &i->settings_path);
+ if (r < 0)
+ return r;
+
+ local_settings = strjoina(i->image_root, "/", i->local, ".nspawn");
+
+ r = copy_file_atomic(
+ i->settings_path,
+ local_settings,
+ 0664,
+ 0, 0,
+ COPY_REFLINK |
+ (FLAGS_SET(i->flags, PULL_FORCE) ? COPY_REPLACE : 0) |
+ (FLAGS_SET(i->flags, PULL_SYNC) ? COPY_FSYNC_FULL : 0));
+ if (r == -EEXIST)
+ log_warning_errno(r, "Settings file %s already exists, not replacing.", local_settings);
+ else if (r == -ENOENT)
+ log_debug_errno(r, "Skipping creation of settings file, since none was found.");
+ else if (r < 0)
+ log_warning_errno(r, "Failed to copy settings files %s, ignoring: %m", local_settings);
+ else
+ log_info("Created new settings file %s.", local_settings);
+ }
+
+ return 0;
+}
+
+static bool tar_pull_is_done(TarPull *i) {
+ assert(i);
+ assert(i->tar_job);
+
+ if (!PULL_JOB_IS_COMPLETE(i->tar_job))
+ return false;
+ if (i->checksum_job && !PULL_JOB_IS_COMPLETE(i->checksum_job))
+ return false;
+ if (i->signature_job && !PULL_JOB_IS_COMPLETE(i->signature_job))
+ return false;
+ if (i->settings_job && !PULL_JOB_IS_COMPLETE(i->settings_job))
+ return false;
+
+ return true;
+}
+
+static void tar_pull_job_on_finished(PullJob *j) {
+ TarPull *i;
+ int r;
+
+ assert(j);
+ assert(j->userdata);
+
+ i = j->userdata;
+
+ if (j->error != 0) {
+ if (j == i->tar_job) {
+ if (j->error == ENOMEDIUM) /* HTTP 404 */
+ r = log_error_errno(j->error, "Failed to retrieve image file. (Wrong URL?)");
+ else
+ r = log_error_errno(j->error, "Failed to retrieve image file.");
+ goto finish;
+ } else if (j == i->checksum_job) {
+ r = log_error_errno(j->error, "Failed to retrieve SHA256 checksum, cannot verify. (Try --verify=no?)");
+ goto finish;
+ } else if (j == i->signature_job)
+ log_debug_errno(j->error, "Signature job for %s failed, proceeding for now.", j->url);
+ else if (j == i->settings_job)
+ log_info_errno(j->error, "Settings file could not be retrieved, proceeding without.");
+ else
+ assert("unexpected job");
+ }
+
+ /* This is invoked if either the download completed successfully, or the download was skipped because
+ * we already have the etag. */
+
+ if (!tar_pull_is_done(i))
+ return;
+
+ if (i->signature_job && i->signature_job->error != 0) {
+ VerificationStyle style;
+
+ assert(i->checksum_job);
+
+ r = verification_style_from_url(i->checksum_job->url, &style);
+ if (r < 0) {
+ log_error_errno(r, "Failed to determine verification style from checksum URL: %m");
+ goto finish;
+ }
+
+ if (style == VERIFICATION_PER_DIRECTORY) { /* A failed signature file download only matters
+ * in per-directory verification mode, since only
+ * then the signature is detached, and thus a file
+ * of its own. */
+ r = log_error_errno(i->signature_job->error,
+ "Failed to retrieve signature file, cannot verify. (Try --verify=no?)");
+ goto finish;
+ }
+ }
+
+ pull_job_close_disk_fd(i->tar_job);
+ pull_job_close_disk_fd(i->settings_job);
+
+ if (i->tar_pid > 0) {
+ r = wait_for_terminate_and_check("tar", TAKE_PID(i->tar_pid), WAIT_LOG);
+ if (r < 0)
+ goto finish;
+ if (r != EXIT_SUCCESS) {
+ r = -EIO;
+ goto finish;
+ }
+ }
+
+ if (!i->tar_job->etag_exists) {
+ /* This is a new download, verify it, and move it into place */
+
+ tar_pull_report_progress(i, TAR_VERIFYING);
+
+ r = pull_verify(i->verify,
+ i->checksum,
+ i->tar_job,
+ i->checksum_job,
+ i->signature_job,
+ i->settings_job,
+ /* roothash_job = */ NULL,
+ /* roothash_signature_job = */ NULL,
+ /* verity_job = */ NULL);
+ if (r < 0)
+ goto finish;
+ }
+
+ if (i->flags & PULL_DIRECT) {
+ assert(!i->settings_job);
+ assert(i->local);
+ assert(!i->temp_path);
+
+ tar_pull_report_progress(i, TAR_FINALIZING);
+
+ r = import_mangle_os_tree(i->local);
+ if (r < 0)
+ goto finish;
+
+ r = install_file(
+ AT_FDCWD, i->local,
+ AT_FDCWD, NULL,
+ (i->flags & PULL_READ_ONLY) ? INSTALL_READ_ONLY : 0 |
+ (i->flags & PULL_SYNC ? INSTALL_SYNCFS : 0));
+ if (r < 0) {
+ log_error_errno(r, "Failed to finalize '%s': %m", i->local);
+ goto finish;
+ }
+ } else {
+ r = tar_pull_determine_path(i, NULL, &i->final_path);
+ if (r < 0)
+ goto finish;
+
+ if (!i->tar_job->etag_exists) {
+ /* This is a new download, verify it, and move it into place */
+
+ assert(i->temp_path);
+ assert(i->final_path);
+
+ tar_pull_report_progress(i, TAR_FINALIZING);
+
+ r = import_mangle_os_tree(i->temp_path);
+ if (r < 0)
+ goto finish;
+
+ r = install_file(
+ AT_FDCWD, i->temp_path,
+ AT_FDCWD, i->final_path,
+ INSTALL_READ_ONLY|
+ (i->flags & PULL_SYNC ? INSTALL_SYNCFS : 0));
+ if (r < 0) {
+ log_error_errno(r, "Failed to rename to final image name to %s: %m", i->final_path);
+ goto finish;
+ }
+
+ i->temp_path = mfree(i->temp_path);
+
+ if (i->settings_job &&
+ i->settings_job->error == 0) {
+
+ /* Also move the settings file into place, if it exists. Note that we do so only if we also
+ * moved the tar file in place, to keep things strictly in sync. */
+ assert(i->settings_temp_path);
+
+ /* Regenerate final name for this auxiliary file, we might know the etag of the file now, and
+ * we should incorporate it in the file name if we can */
+ i->settings_path = mfree(i->settings_path);
+
+ r = tar_pull_determine_path(i, ".nspawn", &i->settings_path);
+ if (r < 0)
+ goto finish;
+
+ r = install_file(
+ AT_FDCWD, i->settings_temp_path,
+ AT_FDCWD, i->settings_path,
+ INSTALL_READ_ONLY|
+ (i->flags & PULL_SYNC ? INSTALL_FSYNC_FULL : 0));
+ if (r < 0) {
+ log_error_errno(r, "Failed to rename settings file to %s: %m", i->settings_path);
+ goto finish;
+ }
+
+ i->settings_temp_path = mfree(i->settings_temp_path);
+ }
+ }
+
+ tar_pull_report_progress(i, TAR_COPYING);
+
+ r = tar_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 tar_pull_job_on_open_disk_tar(PullJob *j) {
+ const char *where;
+ TarPull *i;
+ int r;
+
+ assert(j);
+ assert(j->userdata);
+
+ i = j->userdata;
+ assert(i->tar_job == j);
+ assert(i->tar_pid <= 0);
+
+ if (i->flags & PULL_DIRECT)
+ where = i->local;
+ else {
+ if (!i->temp_path) {
+ r = tempfn_random_child(i->image_root, "tar", &i->temp_path);
+ if (r < 0)
+ return log_oom();
+ }
+
+ where = i->temp_path;
+ }
+
+ (void) mkdir_parents_label(where, 0700);
+
+ if (FLAGS_SET(i->flags, PULL_DIRECT|PULL_FORCE))
+ (void) rm_rf(where, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
+
+ if (i->flags & PULL_BTRFS_SUBVOL)
+ r = btrfs_subvol_make_fallback(where, 0755);
+ else
+ r = RET_NERRNO(mkdir(where, 0755));
+ if (r == -EEXIST && (i->flags & PULL_DIRECT)) /* EEXIST is OK if in direct mode, but not otherwise,
+ * because in that case our temporary path collided */
+ r = 0;
+ if (r < 0)
+ return log_error_errno(r, "Failed to create directory/subvolume %s: %m", where);
+ if (r > 0 && (i->flags & PULL_BTRFS_QUOTA)) { /* actually btrfs subvol */
+ if (!(i->flags & PULL_DIRECT))
+ (void) import_assign_pool_quota_and_warn(i->image_root);
+ (void) import_assign_pool_quota_and_warn(where);
+ }
+
+ j->disk_fd = import_fork_tar_x(where, &i->tar_pid);
+ if (j->disk_fd < 0)
+ return j->disk_fd;
+
+ return 0;
+}
+
+static int tar_pull_job_on_open_disk_settings(PullJob *j) {
+ TarPull *i;
+ int r;
+
+ assert(j);
+ assert(j->userdata);
+
+ i = j->userdata;
+ assert(i->settings_job == j);
+
+ if (!i->settings_temp_path) {
+ r = tempfn_random_child(i->image_root, "settings", &i->settings_temp_path);
+ if (r < 0)
+ return log_oom();
+ }
+
+ (void) mkdir_parents_label(i->settings_temp_path, 0700);
+
+ j->disk_fd = open(i->settings_temp_path, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664);
+ if (j->disk_fd < 0)
+ return log_error_errno(errno, "Failed to create %s: %m", i->settings_temp_path);
+
+ return 0;
+}
+
+static void tar_pull_job_on_progress(PullJob *j) {
+ TarPull *i;
+
+ assert(j);
+ assert(j->userdata);
+
+ i = j->userdata;
+
+ tar_pull_report_progress(i, TAR_DOWNLOADING);
+}
+
+int tar_pull_start(
+ TarPull *i,
+ const char *url,
+ const char *local,
+ PullFlags flags,
+ ImportVerify verify,
+ const char *checksum) {
+
+ PullJob *j;
+ int r;
+
+ assert(i);
+ assert(verify == _IMPORT_VERIFY_INVALID || verify < _IMPORT_VERIFY_MAX);
+ assert(verify == _IMPORT_VERIFY_INVALID || verify >= 0);
+ assert((verify < 0) || !checksum);
+ assert(!(flags & ~PULL_FLAGS_MASK_TAR));
+ assert(!(flags & PULL_SETTINGS) || !(flags & PULL_DIRECT));
+ assert(!(flags & PULL_SETTINGS) || !checksum);
+
+ if (!http_url_is_valid(url) && !file_url_is_valid(url))
+ return -EINVAL;
+
+ if (local && !pull_validate_local(local, flags))
+ return -EINVAL;
+
+ if (i->tar_job)
+ return -EBUSY;
+
+ r = free_and_strdup(&i->local, local);
+ if (r < 0)
+ return r;
+
+ r = free_and_strdup(&i->checksum, checksum);
+ if (r < 0)
+ return r;
+
+ i->flags = flags;
+ i->verify = verify;
+
+ /* Set up download job for TAR file */
+ r = pull_job_new(&i->tar_job, url, i->glue, i);
+ if (r < 0)
+ return r;
+
+ i->tar_job->on_finished = tar_pull_job_on_finished;
+ i->tar_job->on_open_disk = tar_pull_job_on_open_disk_tar;
+ i->tar_job->calc_checksum = checksum || IN_SET(verify, IMPORT_VERIFY_CHECKSUM, IMPORT_VERIFY_SIGNATURE);
+
+ if (!FLAGS_SET(flags, PULL_DIRECT)) {
+ r = pull_find_old_etags(url, i->image_root, DT_DIR, ".tar-", NULL, &i->tar_job->old_etags);
+ if (r < 0)
+ return r;
+ }
+
+ /* Set up download of checksum/signature files */
+ r = pull_make_verification_jobs(
+ &i->checksum_job,
+ &i->signature_job,
+ verify,
+ checksum,
+ url,
+ i->glue,
+ tar_pull_job_on_finished,
+ i);
+ if (r < 0)
+ return r;
+
+ /* Set up download job for the settings file (.nspawn) */
+ if (FLAGS_SET(flags, PULL_SETTINGS)) {
+ r = pull_make_auxiliary_job(
+ &i->settings_job,
+ url,
+ tar_strip_suffixes,
+ ".nspawn",
+ verify,
+ i->glue,
+ tar_pull_job_on_open_disk_settings,
+ tar_pull_job_on_finished,
+ i);
+ if (r < 0)
+ return r;
+ }
+
+ FOREACH_POINTER(j,
+ i->tar_job,
+ i->checksum_job,
+ i->signature_job,
+ i->settings_job) {
+
+ if (!j)
+ continue;
+
+ j->on_progress = tar_pull_job_on_progress;
+ j->sync = FLAGS_SET(flags, PULL_SYNC);
+
+ r = pull_job_begin(j);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 17:56:41 +0000