118 lines
4.2 KiB
C
118 lines
4.2 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 2014 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 "fd-util.h"
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#include "io-util.h"
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#include "selinux-util.h"
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#include "util.h"
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#define MESSAGE \
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"This file was created by systemd-update-done. Its only \n" \
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"purpose is to hold a timestamp of the time this directory\n" \
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"was updated. See systemd-update-done.service(8).\n"
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static int apply_timestamp(const char *path, struct timespec *ts) {
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struct timespec twice[2] = {
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*ts,
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*ts
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};
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struct stat st;
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assert(path);
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assert(ts);
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if (stat(path, &st) >= 0) {
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/* Is the timestamp file already newer than the OS? If
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* so, there's nothing to do. We ignore the nanosecond
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* component of the timestamp, since some file systems
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* do not support any better accuracy than 1s and we
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* have no way to identify the accuracy
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* available. Most notably ext4 on small disks (where
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* 128 byte inodes are used) does not support better
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* accuracy than 1s. */
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if (st.st_mtim.tv_sec > ts->tv_sec)
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return 0;
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/* It is older? Then let's update it */
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if (utimensat(AT_FDCWD, path, twice, AT_SYMLINK_NOFOLLOW) < 0) {
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if (errno == EROFS)
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return log_debug("Can't update timestamp file %s, file system is read-only.", path);
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return log_error_errno(errno, "Failed to update timestamp on %s: %m", path);
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}
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} else if (errno == ENOENT) {
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_cleanup_close_ int fd = -1;
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int r;
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/* The timestamp file doesn't exist yet? Then let's create it. */
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r = mac_selinux_create_file_prepare(path, S_IFREG);
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if (r < 0)
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return log_error_errno(r, "Failed to set SELinux context for %s: %m", path);
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fd = open(path, O_CREAT|O_EXCL|O_WRONLY|O_TRUNC|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0644);
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mac_selinux_create_file_clear();
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if (fd < 0) {
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if (errno == EROFS)
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return log_debug("Can't create timestamp file %s, file system is read-only.", path);
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return log_error_errno(errno, "Failed to create timestamp file %s: %m", path);
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}
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(void) loop_write(fd, MESSAGE, strlen(MESSAGE), false);
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if (futimens(fd, twice) < 0)
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return log_error_errno(errno, "Failed to update timestamp on %s: %m", path);
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} else
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log_error_errno(errno, "Failed to stat() timestamp file %s: %m", path);
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return 0;
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}
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int main(int argc, char *argv[]) {
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struct stat st;
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int r, q = 0;
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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if (stat("/usr", &st) < 0) {
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log_error_errno(errno, "Failed to stat /usr: %m");
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return EXIT_FAILURE;
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}
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r = mac_selinux_init(NULL);
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if (r < 0) {
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log_error_errno(r, "SELinux setup failed: %m");
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goto finish;
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}
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r = apply_timestamp("/etc/.updated", &st.st_mtim);
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q = apply_timestamp("/var/.updated", &st.st_mtim);
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finish:
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return r < 0 || q < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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