ec2ebfd524
This is a follow-up for fb8b0869a7, and makes a
couple of minor clean-up changes:
- The field name in the timestamp file is changed from "TimestampNSec=" to
"TIMESTAMP_NSEC=". This is done simply to reflect the fact that we parse the
file with the env var file parser, and hence the contents should better
follow the usual capitalization of env vars, i.e. be all uppercase.
- Needless negation of the errno parameter log_error_errno() and friends has
been removed.
- Instead of manually calculating the nsec remainder of the timestamp, use
timespec_store().
- We now check whether we were able to write the timestamp file in full with
fflush_and_check() the way we usually do it.
109 lines
3.5 KiB
C
109 lines
3.5 KiB
C
/***
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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 "fileio.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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_cleanup_fclose_ FILE *f = NULL;
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int fd = -1;
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int r;
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assert(path);
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assert(ts);
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/*
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* We store the timestamp both as mtime of the file and in the file itself,
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* to support filesystems which cannot store nanosecond-precision timestamps.
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* Hence, don't bother updating the file, let's just rewrite it.
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*/
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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_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/open timestamp file %s: %m", path);
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}
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f = fdopen(fd, "we");
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if (!f) {
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safe_close(fd);
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return log_error_errno(errno, "Failed to fdopen() timestamp file %s: %m", path);
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}
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(void) fprintf(f,
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MESSAGE
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"TIMESTAMP_NSEC=" NSEC_FMT "\n",
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timespec_load_nsec(ts));
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r = fflush_and_check(f);
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if (r < 0)
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return log_error_errno(r, "Failed to write timestamp file: %m");
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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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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();
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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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