src/update-done/update-done.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <sys/stat.h>
   4 #include <sys/types.h>
   5 #include <unistd.h>
   6
   7 #include "alloc-util.h"
   8 #include "fileio-label.h"
   9 #include "selinux-util.h"
  10 #include "time-util.h"
  11
  12 #define MESSAGE                                                         \
  13         "# This file was created by systemd-update-done. Its only \n"   \
  14         "# purpose is to hold a timestamp of the time this directory\n" \
  15         "# was updated. See man:systemd-update-done.service(8).\n"
  16
  17 static int apply_timestamp(const char *path, struct timespec *ts) {
  18         _cleanup_free_ char *message = NULL;
  19         int r;
  20
  21         /*
  22          * We store the timestamp both as mtime of the file and in the file itself,
  23          * to support filesystems which cannot store nanosecond-precision timestamps.
  24          */
  25
  26         if (asprintf(&message,
  27                      MESSAGE
  28                      "TIMESTAMP_NSEC=" NSEC_FMT "\n",
  29                      timespec_load_nsec(ts)) < 0)
  30                 return log_oom();
  31
  32         r = write_string_file_atomic_label_ts(path, message, ts);
  33         if (r == -EROFS)
  34                 return log_debug("Cannot create \"%s\", file system is read-only.", path);
  35         if (r < 0)
  36                 return log_error_errno(r, "Failed to write \"%s\": %m", path);
  37         return 0;
  38 }
  39
  40 int main(int argc, char *argv[]) {
  41         struct stat st;
  42         int r, q = 0;
  43
  44         log_setup_service();
  45
  46         if (stat("/usr", &st) < 0) {
  47                 log_error_errno(errno, "Failed to stat /usr: %m");
  48                 return EXIT_FAILURE;
  49         }
  50
  51         r = mac_selinux_init();
  52         if (r < 0) {
  53                 log_error_errno(r, "SELinux setup failed: %m");
  54                 return EXIT_FAILURE;
  55         }
  56
  57         r = apply_timestamp("/etc/.updated", &st.st_mtim);
  58         q = apply_timestamp("/var/.updated", &st.st_mtim);
  59
  60         return r < 0 || q < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
  61 }