src/update-done/update-done.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include "alloc-util.h"
   4 #include "fileio-label.h"
   5 #include "selinux-util.h"
   6 #include "util.h"
   7
   8 #define MESSAGE                                                         \
   9         "# This file was created by systemd-update-done. Its only \n"   \
  10         "# purpose is to hold a timestamp of the time this directory\n" \
  11         "# was updated. See man:systemd-update-done.service(8).\n"
  12
  13 static int apply_timestamp(const char *path, struct timespec *ts) {
  14         _cleanup_free_ char *message = NULL;
  15         int r;
  16
  17         /*
  18          * We store the timestamp both as mtime of the file and in the file itself,
  19          * to support filesystems which cannot store nanosecond-precision timestamps.
  20          */
  21
  22         if (asprintf(&message,
  23                      MESSAGE
  24                      "TIMESTAMP_NSEC=" NSEC_FMT "\n",
  25                      timespec_load_nsec(ts)) < 0)
  26                 return log_oom();
  27
  28         r = write_string_file_atomic_label_ts(path, message, ts);
  29         if (r == -EROFS)
  30                 return log_debug("Cannot create \"%s\", file system is read-only.", path);
  31         if (r < 0)
  32                 return log_error_errno(r, "Failed to write \"%s\": %m", path);
  33         return 0;
  34 }
  35
  36 int main(int argc, char *argv[]) {
  37         struct stat st;
  38         int r, q = 0;
  39
  40         log_setup_service();
  41
  42         if (stat("/usr", &st) < 0) {
  43                 log_error_errno(errno, "Failed to stat /usr: %m");
  44                 return EXIT_FAILURE;
  45         }
  46
  47         r = mac_selinux_init();
  48         if (r < 0) {
  49                 log_error_errno(r, "SELinux setup failed: %m");
  50                 return EXIT_FAILURE;
  51         }
  52
  53         r = apply_timestamp("/etc/.updated", &st.st_mtim);
  54         q = apply_timestamp("/var/.updated", &st.st_mtim);
  55
  56         return r < 0 || q < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
  57 }