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;
+}