Adding upstream version 252.22.upstream/252.22

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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;
+}