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Diffstat (limited to 'src/systemd-update-done/update-done.c')
-rw-r--r--src/systemd-update-done/update-done.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/src/systemd-update-done/update-done.c b/src/systemd-update-done/update-done.c
new file mode 100644
index 0000000000..da306a4444
--- /dev/null
+++ b/src/systemd-update-done/update-done.c
@@ -0,0 +1,115 @@
+/***
+ 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();
+ 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;
+}