/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** 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 "util.h" #include "label.h" #include "selinux-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]; 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. */ if (st.st_mtim.tv_sec > ts->tv_sec || (st.st_mtim.tv_sec == ts->tv_sec && st.st_mtim.tv_nsec >= ts->tv_nsec)) return 0; /* It is older? Then let's update it */ twice[0] = *ts; twice[1] = *ts; 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); twice[0] = *ts; twice[1] = *ts; 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(NULL); 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; }