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-rw-r--r--src/update-done/update-done.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/src/update-done/update-done.c b/src/update-done/update-done.c
new file mode 100644
index 0000000..f448b3b
--- /dev/null
+++ b/src/update-done/update-done.c
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "fileio-label.h"
+#include "selinux-util.h"
+#include "time-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 man:systemd-update-done.service(8).\n"
+
+static int apply_timestamp(const char *path, struct timespec *ts) {
+ _cleanup_free_ char *message = NULL;
+ int r;
+
+ /*
+ * We store the timestamp both as mtime of the file and in the file itself,
+ * to support filesystems which cannot store nanosecond-precision timestamps.
+ */
+
+ if (asprintf(&message,
+ MESSAGE
+ "TIMESTAMP_NSEC=" NSEC_FMT "\n",
+ timespec_load_nsec(ts)) < 0)
+ return log_oom();
+
+ r = write_string_file_atomic_label_ts(path, message, ts);
+ if (r == -EROFS)
+ log_debug_errno(r, "Cannot create \"%s\", file system is read-only.", path);
+ else if (r < 0)
+ return log_error_errno(r, "Failed to write \"%s\": %m", path);
+ return 0;
+}
+
+int main(int argc, char *argv[]) {
+ struct stat st;
+ int r, q = 0;
+
+ log_setup();
+
+ if (stat("/usr", &st) < 0) {
+ log_error_errno(errno, "Failed to stat /usr: %m");
+ return EXIT_FAILURE;
+ }
+
+ r = mac_init();
+ if (r < 0)
+ return EXIT_FAILURE;
+
+ r = apply_timestamp("/etc/.updated", &st.st_mtim);
+ q = apply_timestamp("/var/.updated", &st.st_mtim);
+
+ return r < 0 || q < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}