summaryrefslogtreecommitdiff
path: root/src/system-update-generator/system-update-generator.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/system-update-generator/system-update-generator.c')
-rw-r--r--src/system-update-generator/system-update-generator.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/src/system-update-generator/system-update-generator.c b/src/system-update-generator/system-update-generator.c
new file mode 100644
index 0000000000..0cfccfb494
--- /dev/null
+++ b/src/system-update-generator/system-update-generator.c
@@ -0,0 +1,81 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2012 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 <errno.h>
+#include <unistd.h>
+
+#include "log.h"
+#include "util.h"
+#include "unit-name.h"
+#include "path-util.h"
+
+static const char *arg_dest = "/tmp";
+
+static int generate_symlink(void) {
+ struct stat st;
+ char *p;
+
+ if (lstat("/system-update", &st) < 0) {
+ if (errno == ENOENT)
+ return 0;
+
+ log_error("Failed to check for system update: %m");
+ return -EINVAL;
+ }
+
+ p = strappend(arg_dest, "/default.target");
+ if (!p) {
+ log_error("Out of memory.");
+ return -ENOMEM;
+ }
+
+ if (symlink(SYSTEM_DATA_UNIT_PATH "/system-update.target", p) < 0) {
+ free(p);
+ log_error("Failed to create symlink: %m");
+ return -errno;
+ }
+
+ free(p);
+
+ return 0;
+}
+
+int main(int argc, char *argv[]) {
+ int r;
+
+ if (argc > 2) {
+ log_error("This program takes one or no arguments.");
+ return EXIT_FAILURE;
+ }
+
+ if (argc > 1)
+ arg_dest = argv[1];
+
+ log_set_target(LOG_TARGET_AUTO);
+ log_parse_environment();
+ log_open();
+
+ umask(0022);
+
+ r = generate_symlink();
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}