#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 "rm-rf.h"

#include "path-util.h"

#include "process-util.h"

#include "hostname-util.h"

#include "import-util.h"

#include "import-common.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) rm_rf(i->temp_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);

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");

i->event = sd_event_ref(event);

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

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 = import_make_read_only(i->temp_path);

if (r < 0)

goto finish;

r = rename_noreplace(AT_FDCWD, i->temp_path, AT_FDCWD, i->final_path);

if (r < 0) {

log_error_errno(r, "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, NULL, &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 = import_fork_tar_x(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;

}