531 lines
17 KiB
C
531 lines
17 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2015 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <sys/prctl.h>
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#include "util.h"
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#include "strv.h"
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#include "copy.h"
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#include "btrfs-util.h"
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#include "capability.h"
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#include "import-job.h"
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#include "import-common.h"
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#define FILENAME_ESCAPE "/.#\"\'"
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int import_find_old_etags(const char *url, const char *image_root, int dt, const char *prefix, const char *suffix, char ***etags) {
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_cleanup_free_ char *escaped_url = NULL;
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_cleanup_closedir_ DIR *d = NULL;
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_cleanup_strv_free_ char **l = NULL;
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struct dirent *de;
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int r;
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assert(url);
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assert(etags);
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if (!image_root)
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image_root = "/var/lib/machines";
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escaped_url = xescape(url, FILENAME_ESCAPE);
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if (!escaped_url)
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return -ENOMEM;
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d = opendir(image_root);
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if (!d) {
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if (errno == ENOENT) {
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*etags = NULL;
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return 0;
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}
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return -errno;
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}
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FOREACH_DIRENT_ALL(de, d, return -errno) {
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const char *a, *b;
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char *u;
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if (de->d_type != DT_UNKNOWN &&
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de->d_type != dt)
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continue;
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if (prefix) {
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a = startswith(de->d_name, prefix);
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if (!a)
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continue;
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} else
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a = de->d_name;
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a = startswith(a, escaped_url);
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if (!a)
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continue;
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a = startswith(a, ".");
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if (!a)
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continue;
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if (suffix) {
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b = endswith(de->d_name, suffix);
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if (!b)
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continue;
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} else
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b = strchr(de->d_name, 0);
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if (a >= b)
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continue;
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u = cunescape_length(a, b - a);
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if (!u)
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return -ENOMEM;
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if (!http_etag_is_valid(u)) {
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free(u);
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continue;
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}
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r = strv_consume(&l, u);
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if (r < 0)
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return r;
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}
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*etags = l;
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l = NULL;
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return 0;
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}
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int import_make_local_copy(const char *final, const char *image_root, const char *local, bool force_local) {
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const char *p;
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int r;
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assert(final);
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assert(local);
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if (!image_root)
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image_root = "/var/lib/machines";
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p = strjoina(image_root, "/", local);
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if (force_local) {
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(void) btrfs_subvol_remove(p);
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(void) rm_rf_dangerous(p, false, true, false);
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}
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r = btrfs_subvol_snapshot(final, p, false, false);
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if (r == -ENOTTY) {
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r = copy_tree(final, p, false);
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if (r < 0)
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return log_error_errno(r, "Failed to copy image: %m");
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} else if (r < 0)
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return log_error_errno(r, "Failed to create local image: %m");
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log_info("Created new local image '%s'.", local);
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return 0;
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}
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int import_make_read_only_fd(int fd) {
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int r;
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assert(fd >= 0);
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/* First, let's make this a read-only subvolume if it refers
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* to a subvolume */
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r = btrfs_subvol_set_read_only_fd(fd, true);
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if (r == -ENOTTY || r == -ENOTDIR || r == -EINVAL) {
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struct stat st;
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/* This doesn't refer to a subvolume, or the file
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* system isn't even btrfs. In that, case fall back to
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* chmod()ing */
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r = fstat(fd, &st);
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if (r < 0)
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return log_error_errno(errno, "Failed to stat temporary image: %m");
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/* Drop "w" flag */
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if (fchmod(fd, st.st_mode & 07555) < 0)
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return log_error_errno(errno, "Failed to chmod() final image: %m");
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return 0;
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} else if (r < 0)
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return log_error_errno(r, "Failed to make subvolume read-only: %m");
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return 0;
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}
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int import_make_read_only(const char *path) {
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_cleanup_close_ int fd = 1;
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fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC);
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if (fd < 0)
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return log_error_errno(errno, "Failed to open %s: %m", path);
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return import_make_read_only_fd(fd);
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}
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int import_make_path(const char *url, const char *etag, const char *image_root, const char *prefix, const char *suffix, char **ret) {
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_cleanup_free_ char *escaped_url = NULL;
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char *path;
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assert(url);
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assert(ret);
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if (!image_root)
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image_root = "/var/lib/machines";
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escaped_url = xescape(url, FILENAME_ESCAPE);
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if (!escaped_url)
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return -ENOMEM;
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if (etag) {
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_cleanup_free_ char *escaped_etag = NULL;
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escaped_etag = xescape(etag, FILENAME_ESCAPE);
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if (!escaped_etag)
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return -ENOMEM;
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path = strjoin(image_root, "/", strempty(prefix), escaped_url, ".", escaped_etag, strempty(suffix), NULL);
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} else
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path = strjoin(image_root, "/", strempty(prefix), escaped_url, strempty(suffix), NULL);
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if (!path)
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return -ENOMEM;
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*ret = path;
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return 0;
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}
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int import_make_verification_jobs(
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ImportJob **ret_checksum_job,
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ImportJob **ret_signature_job,
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ImportVerify verify,
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const char *url,
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CurlGlue *glue,
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ImportJobFinished on_finished,
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void *userdata) {
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_cleanup_(import_job_unrefp) ImportJob *checksum_job = NULL, *signature_job = NULL;
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int r;
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assert(ret_checksum_job);
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assert(ret_signature_job);
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assert(verify >= 0);
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assert(verify < _IMPORT_VERIFY_MAX);
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assert(url);
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assert(glue);
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if (verify != IMPORT_VERIFY_NO) {
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_cleanup_free_ char *checksum_url = NULL;
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/* Queue job for the SHA256SUMS file for the image */
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r = import_url_change_last_component(url, "SHA256SUMS", &checksum_url);
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if (r < 0)
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return r;
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r = import_job_new(&checksum_job, checksum_url, glue, userdata);
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if (r < 0)
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return r;
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checksum_job->on_finished = on_finished;
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checksum_job->uncompressed_max = checksum_job->compressed_max = 1ULL * 1024ULL * 1024ULL;
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}
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if (verify == IMPORT_VERIFY_SIGNATURE) {
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_cleanup_free_ char *signature_url = NULL;
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/* Queue job for the SHA256SUMS.gpg file for the image. */
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r = import_url_change_last_component(url, "SHA256SUMS.gpg", &signature_url);
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if (r < 0)
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return r;
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r = import_job_new(&signature_job, signature_url, glue, userdata);
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if (r < 0)
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return r;
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signature_job->on_finished = on_finished;
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signature_job->uncompressed_max = signature_job->compressed_max = 1ULL * 1024ULL * 1024ULL;
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}
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*ret_checksum_job = checksum_job;
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*ret_signature_job = signature_job;
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checksum_job = signature_job = NULL;
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return 0;
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}
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int import_verify(
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ImportJob *main_job,
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ImportJob *checksum_job,
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ImportJob *signature_job) {
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_cleanup_close_pair_ int gpg_pipe[2] = { -1, -1 };
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_cleanup_free_ char *fn = NULL;
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_cleanup_close_ int sig_file = -1;
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const char *p, *line;
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char sig_file_path[] = "/tmp/sigXXXXXX";
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_cleanup_sigkill_wait_ pid_t pid = 0;
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int r;
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assert(main_job);
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assert(main_job->state == IMPORT_JOB_DONE);
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if (!checksum_job)
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return 0;
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assert(main_job->calc_checksum);
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assert(main_job->checksum);
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assert(checksum_job->state == IMPORT_JOB_DONE);
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if (!checksum_job->payload || checksum_job->payload_size <= 0) {
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log_error("Checksum is empty, cannot verify.");
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return -EBADMSG;
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}
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r = import_url_last_component(main_job->url, &fn);
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if (r < 0)
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return log_oom();
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if (!filename_is_valid(fn)) {
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log_error("Cannot verify checksum, could not determine valid server-side file name.");
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return -EBADMSG;
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}
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line = strjoina(main_job->checksum, " *", fn, "\n");
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p = memmem(checksum_job->payload,
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checksum_job->payload_size,
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line,
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strlen(line));
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if (!p || (p != (char*) checksum_job->payload && p[-1] != '\n')) {
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log_error("Checksum did not check out, payload has been tempered with.");
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return -EBADMSG;
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}
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log_info("SHA256 checksum of %s is valid.", main_job->url);
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if (!signature_job)
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return 0;
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assert(signature_job->state == IMPORT_JOB_DONE);
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if (!signature_job->payload || signature_job->payload_size <= 0) {
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log_error("Signature is empty, cannot verify.");
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return -EBADMSG;
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}
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r = pipe2(gpg_pipe, O_CLOEXEC);
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if (r < 0)
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return log_error_errno(errno, "Failed to create pipe for gpg: %m");
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sig_file = mkostemp(sig_file_path, O_RDWR);
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if (sig_file < 0)
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return log_error_errno(errno, "Failed to create temporary file: %m");
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r = loop_write(sig_file, signature_job->payload, signature_job->payload_size, false);
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if (r < 0) {
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log_error_errno(r, "Failed to write to temporary file: %m");
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goto finish;
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}
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pid = fork();
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if (pid < 0)
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return log_error_errno(errno, "Failed to fork off gpg: %m");
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if (pid == 0) {
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const char *cmd[] = {
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"gpg",
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"--no-options",
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"--no-default-keyring",
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"--no-auto-key-locate",
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"--no-auto-check-trustdb",
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"--batch",
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"--trust-model=always",
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NULL, /* keyring to use */
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NULL, /* --verify */
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NULL, /* signature file */
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NULL, /* dash */
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NULL /* trailing NULL */
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};
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unsigned k = ELEMENTSOF(cmd) - 5;
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int null_fd;
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/* Child */
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reset_all_signal_handlers();
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reset_signal_mask();
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assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
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gpg_pipe[1] = safe_close(gpg_pipe[1]);
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if (dup2(gpg_pipe[0], STDIN_FILENO) != STDIN_FILENO) {
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log_error_errno(errno, "Failed to dup2() fd: %m");
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_exit(EXIT_FAILURE);
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}
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if (gpg_pipe[0] != STDIN_FILENO)
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gpg_pipe[0] = safe_close(gpg_pipe[0]);
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null_fd = open("/dev/null", O_WRONLY|O_NOCTTY);
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if (null_fd < 0) {
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log_error_errno(errno, "Failed to open /dev/null: %m");
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_exit(EXIT_FAILURE);
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}
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if (dup2(null_fd, STDOUT_FILENO) != STDOUT_FILENO) {
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log_error_errno(errno, "Failed to dup2() fd: %m");
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_exit(EXIT_FAILURE);
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}
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if (null_fd != STDOUT_FILENO)
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null_fd = safe_close(null_fd);
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/* We add the user keyring only to the command line
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* arguments, if it's around since gpg fails
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* otherwise. */
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if (access(USER_KEYRING_PATH, F_OK) >= 0)
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cmd[k++] = "--keyring=" USER_KEYRING_PATH;
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else
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cmd[k++] = "--keyring=" VENDOR_KEYRING_PATH;
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cmd[k++] = "--verify";
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cmd[k++] = sig_file_path;
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cmd[k++] = "-";
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cmd[k++] = NULL;
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fd_cloexec(STDIN_FILENO, false);
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fd_cloexec(STDOUT_FILENO, false);
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fd_cloexec(STDERR_FILENO, false);
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execvp("gpg", (char * const *) cmd);
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log_error_errno(errno, "Failed to execute gpg: %m");
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_exit(EXIT_FAILURE);
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}
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gpg_pipe[0] = safe_close(gpg_pipe[0]);
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r = loop_write(gpg_pipe[1], checksum_job->payload, checksum_job->payload_size, false);
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if (r < 0) {
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log_error_errno(r, "Failed to write to pipe: %m");
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goto finish;
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}
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gpg_pipe[1] = safe_close(gpg_pipe[1]);
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r = wait_for_terminate_and_warn("gpg", pid, true);
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pid = 0;
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if (r < 0)
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goto finish;
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if (r > 0) {
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log_error("Signature verification failed.");
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r = -EBADMSG;
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} else {
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log_info("Signature verification succeeded.");
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r = 0;
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}
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finish:
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if (sig_file >= 0)
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unlink(sig_file_path);
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return r;
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}
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int import_fork_tar(const char *path, pid_t *ret) {
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_cleanup_close_pair_ int pipefd[2] = { -1, -1 };
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pid_t pid;
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int r;
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assert(path);
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assert(ret);
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if (pipe2(pipefd, O_CLOEXEC) < 0)
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return log_error_errno(errno, "Failed to create pipe for tar: %m");
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pid = fork();
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if (pid < 0)
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return log_error_errno(errno, "Failed to fork off tar: %m");
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|
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if (pid == 0) {
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int null_fd;
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uint64_t retain =
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(1ULL << CAP_CHOWN) |
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(1ULL << CAP_FOWNER) |
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(1ULL << CAP_FSETID) |
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(1ULL << CAP_MKNOD) |
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(1ULL << CAP_SETFCAP) |
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(1ULL << CAP_DAC_OVERRIDE);
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|
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/* Child */
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|
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reset_all_signal_handlers();
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reset_signal_mask();
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assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
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pipefd[1] = safe_close(pipefd[1]);
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if (dup2(pipefd[0], STDIN_FILENO) != STDIN_FILENO) {
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log_error_errno(errno, "Failed to dup2() fd: %m");
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_exit(EXIT_FAILURE);
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}
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if (pipefd[0] != STDIN_FILENO)
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pipefd[0] = safe_close(pipefd[0]);
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|
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null_fd = open("/dev/null", O_WRONLY|O_NOCTTY);
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if (null_fd < 0) {
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log_error_errno(errno, "Failed to open /dev/null: %m");
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_exit(EXIT_FAILURE);
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}
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if (dup2(null_fd, STDOUT_FILENO) != STDOUT_FILENO) {
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log_error_errno(errno, "Failed to dup2() fd: %m");
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_exit(EXIT_FAILURE);
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}
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if (null_fd != STDOUT_FILENO)
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null_fd = safe_close(null_fd);
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|
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fd_cloexec(STDIN_FILENO, false);
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fd_cloexec(STDOUT_FILENO, false);
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fd_cloexec(STDERR_FILENO, false);
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|
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if (unshare(CLONE_NEWNET) < 0)
|
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log_error_errno(errno, "Failed to lock tar into network namespace, ignoring: %m");
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|
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r = capability_bounding_set_drop(~retain, true);
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if (r < 0)
|
|
log_error_errno(r, "Failed to drop capabilities, ignoring: %m");
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|
|
execlp("tar", "tar", "--numeric-owner", "-C", path, "-px", NULL);
|
|
log_error_errno(errno, "Failed to execute tar: %m");
|
|
_exit(EXIT_FAILURE);
|
|
}
|
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|
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pipefd[0] = safe_close(pipefd[0]);
|
|
r = pipefd[1];
|
|
pipefd[1] = -1;
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|
|
*ret = pid;
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|
|
return r;
|
|
}
|