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, 414 insertions, 0 deletions

diff --git a/src/import/pull-tar.c b/src/import/pull-tar.c
new file mode 100644
index 0000000000..de653a88f9
--- /dev/null
+++ b/src/import/pull-tar.c
@@ -0,0 +1,414 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2015 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/prctl.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 "pull-job.h"
+#include "pull-common.h"
+#include "pull-tar.h"
+
+typedef enum TarProgress {
+        TAR_DOWNLOADING,
+        TAR_VERIFYING,
+        TAR_FINALIZING,
+        TAR_COPYING,
+} TarProgress;
+
+struct TarPull {
+        sd_event *event;
+        CurlGlue *glue;
+
+        char *image_root;
+
+        PullJob *tar_job;
+        PullJob *checksum_job;
+        PullJob *signature_job;
+
+        TarPullFinished on_finished;
+        void *userdata;
+
+        char *local;
+        bool force_local;
+        bool grow_machine_directory;
+
+        pid_t tar_pid;
+
+        char *temp_path;
+        char *final_path;
+
+        ImportVerify verify;
+};
+
+TarPull* tar_pull_unref(TarPull *i) {
+        if (!i)
+                return NULL;
+
+        if (i->tar_pid > 1) {
+                (void) kill_and_sigcont(i->tar_pid, SIGKILL);
+                (void) wait_for_terminate(i->tar_pid, NULL);
+        }
+
+        pull_job_unref(i->tar_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) btrfs_subvol_remove(i->temp_path);
+                (void) rm_rf_dangerous(i->temp_path, false, true, false);
+                free(i->temp_path);
+        }
+
+        free(i->final_path);
+        free(i->image_root);
+        free(i->local);
+        free(i);
+
+        return NULL;
+}
+
+int tar_pull_new(
+                TarPull **ret,
+                sd_event *event,
+                const char *image_root,
+                TarPullFinished on_finished,
+                void *userdata) {
+
+        _cleanup_(tar_pull_unrefp) TarPull *i = NULL;
+        int r;
+
+        assert(ret);
+        assert(event);
+
+        i = new0(TarPull, 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 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->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("Unknown progress state");
+        }
+
+        sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent);
+        log_debug("Combined progress %u%%", percent);
+}
+
+static int tar_pull_make_local_copy(TarPull *i) {
+        int r;
+
+        assert(i);
+        assert(i->tar_job);
+
+        if (!i->local)
+                return 0;
+
+        if (!i->final_path) {
+                r = pull_make_path(i->tar_job->url, i->tar_job->etag, i->image_root, ".tar-", NULL, &i->final_path);
+                if (r < 0)
+                        return log_oom();
+        }
+
+        r = pull_make_local_copy(i->final_path, i->image_root, i->local, i->force_local);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
+static bool tar_pull_is_done(TarPull *i) {
+        assert(i);
+        assert(i->tar_job);
+
+        if (i->tar_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 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->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. */
+
+        if (!tar_pull_is_done(i))
+                return;
+
+        j->disk_fd = safe_close(i->tar_job->disk_fd);
+
+        if (i->tar_pid > 0) {
+                r = wait_for_terminate_and_warn("tar", i->tar_pid, true);
+                i->tar_pid = 0;
+                if (r < 0)
+                        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->tar_job, i->checksum_job, i->signature_job);
+                if (r < 0)
+                        goto finish;
+
+                tar_pull_report_progress(i, TAR_FINALIZING);
+
+                r = pull_make_read_only(i->temp_path);
+                if (r < 0)
+                        goto finish;
+
+                if (rename(i->temp_path, i->final_path) < 0) {
+                        r = log_error_errno(errno, "Failed to rename to final image name: %m");
+                        goto finish;
+                }
+
+                free(i->temp_path);
+                i->temp_path = NULL;
+        }
+
+        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(PullJob *j) {
+        TarPull *i;
+        int r;
+
+        assert(j);
+        assert(j->userdata);
+
+        i = j->userdata;
+        assert(i->tar_job == j);
+        assert(!i->final_path);
+        assert(!i->temp_path);
+        assert(i->tar_pid <= 0);
+
+        r = pull_make_path(j->url, j->etag, i->image_root, ".tar-", NULL, &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);
+
+        r = btrfs_subvol_make(i->temp_path);
+        if (r == -ENOTTY) {
+                if (mkdir(i->temp_path, 0755) < 0)
+                        return log_error_errno(errno, "Failed to create directory %s: %m", i->temp_path);
+        } else if (r < 0)
+                return log_error_errno(errno, "Failed to create subvolume %s: %m", i->temp_path);
+
+        j->disk_fd = pull_fork_tar(i->temp_path, &i->tar_pid);
+        if (j->disk_fd < 0)
+                return j->disk_fd;
+
+        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, bool force_local, ImportVerify verify) {
+        int r;
+
+        assert(i);
+
+        if (!http_url_is_valid(url))
+                return -EINVAL;
+
+        if (local && !machine_name_is_valid(local))
+                return -EINVAL;
+
+        if (i->tar_job)
+                return -EBUSY;
+
+        r = free_and_strdup(&i->local, local);
+        if (r < 0)
+                return r;
+        i->force_local = force_local;
+        i->verify = verify;
+
+        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;
+        i->tar_job->on_progress = tar_pull_job_on_progress;
+        i->tar_job->calc_checksum = verify != IMPORT_VERIFY_NO;
+        i->tar_job->grow_machine_directory = i->grow_machine_directory;
+
+        r = pull_find_old_etags(url, i->image_root, DT_DIR, ".tar-", NULL, &i->tar_job->old_etags);
+        if (r < 0)
+                return r;
+
+        r = pull_make_verification_jobs(&i->checksum_job, &i->signature_job, verify, url, i->glue, tar_pull_job_on_finished, i);
+        if (r < 0)
+                return r;
+
+        r = pull_job_begin(i->tar_job);
+        if (r < 0)
+                return r;
+
+        if (i->checksum_job) {
+                i->checksum_job->on_progress = tar_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 = tar_pull_job_on_progress;
+
+                r = pull_job_begin(i->signature_job);
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}