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