#include <sys/prctl.h>

#include <curl/curl.h>

#include "utf8.h"

#include "strv.h"

#include "copy.h"

#include "btrfs-util.h"

#include "util.h"

#include "macro.h"

#include "mkdir.h"

#include "curl-util.h"

#include "import-job.h"

#include "import-util.h"

#include "import-tar.h"

struct TarImport {

sd_event *event;

CurlGlue *glue;

char *image_root;

ImportJob *tar_job;

TarImportFinished on_finished;

void *userdata;

char *local;

bool force_local;

pid_t tar_pid;

char *temp_path;

char *final_path;

};

TarImport* tar_import_unref(TarImport *i) {

if (!i)

return NULL;

if (i->tar_pid > 0) {

kill(i->tar_pid, SIGKILL);

wait_for_terminate(i->tar_pid, NULL);

}

import_job_unref(i->tar_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_import_new(TarImport **ret, sd_event *event, const char *image_root, TarImportFinished on_finished, void *userdata) {

_cleanup_(tar_import_unrefp) TarImport *i = NULL;

int r;

assert(ret);

assert(event);

i = new0(TarImport, 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;

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 = import_job_curl_on_finished;

i->glue->userdata = i;

*ret = i;

i = NULL;

return 0;

}

static int tar_import_make_local_copy(TarImport *i) {

int r;

assert(i);

assert(i->tar_job);

if (!i->local)

return 0;

if (!i->final_path) {

r = import_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 = import_make_local_copy(i->final_path, i->image_root, i->local, i->force_local);

if (r < 0)

return r;

}

return 0;

}

static void tar_import_job_on_finished(ImportJob *j) {

TarImport *i;

int r;

assert(j);

assert(j->userdata);

i = j->userdata;

if (j->error != 0) {

r = j->error;

goto finish;

}

/* This is invoked if either the download completed

j->disk_fd = safe_close(j->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->temp_path) {

r = import_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;

}

r = tar_import_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_import_job_on_open_disk(ImportJob *j) {

_cleanup_close_pair_ int pipefd[2] = { -1 , -1 };

TarImport *i;

int r;

assert(j);

assert(j->userdata);

i = j->userdata;

r = import_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);

if (pipe2(pipefd, O_CLOEXEC) < 0)

return log_error_errno(errno, "Failed to create pipe for tar: %m");

i->tar_pid = fork();

if (i->tar_pid < 0)

return log_error_errno(errno, "Failed to fork off tar: %m");

if (i->tar_pid == 0) {

int null_fd;

reset_all_signal_handlers();

reset_signal_mask();

assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);

pipefd[1] = safe_close(pipefd[1]);

if (dup2(pipefd[0], STDIN_FILENO) != STDIN_FILENO) {

log_error_errno(errno, "Failed to dup2() fd: %m");

_exit(EXIT_FAILURE);

}

if (pipefd[0] != STDIN_FILENO)

safe_close(pipefd[0]);

null_fd = open("/dev/null", O_WRONLY|O_NOCTTY);

if (null_fd < 0) {

log_error_errno(errno, "Failed to open /dev/null: %m");

_exit(EXIT_FAILURE);

}

if (dup2(null_fd, STDOUT_FILENO) != STDOUT_FILENO) {

log_error_errno(errno, "Failed to dup2() fd: %m");

_exit(EXIT_FAILURE);

}

if (null_fd != STDOUT_FILENO)

safe_close(null_fd);

execlp("tar", "tar", "--numeric-owner", "-C", i->temp_path, "-px", NULL);

_exit(EXIT_FAILURE);

}

pipefd[0] = safe_close(pipefd[0]);

j->disk_fd = pipefd[1];

pipefd[1] = -1;

return 0;

}

int tar_import_pull(TarImport *i, const char *url, const char *local, bool force_local) {

int r;

assert(i);

if (i->tar_job)

return -EBUSY;

if (!http_url_is_valid(url))

return -EINVAL;

if (local && !machine_name_is_valid(local))

return -EINVAL;

r = free_and_strdup(&i->local, local);

if (r < 0)

return r;

i->force_local = force_local;

r = import_job_new(&i->tar_job, url, i->glue, i);

if (r < 0)

return r;

i->tar_job->on_finished = tar_import_job_on_finished;

i->tar_job->on_open_disk = tar_import_job_on_open_disk;

r = import_find_old_etags(url, i->image_root, DT_DIR, ".tar-", NULL, &i->tar_job->old_etags);

if (r < 0)

return r;

return import_job_begin(i->tar_job);

}