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Diffstat (limited to 'src/systemd-system-update-generator/system-update-generator.c')
-rw-r--r--src/systemd-system-update-generator/system-update-generator.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/src/systemd-system-update-generator/system-update-generator.c b/src/systemd-system-update-generator/system-update-generator.c
new file mode 100644
index 0000000000..a3d677f068
--- /dev/null
+++ b/src/systemd-system-update-generator/system-update-generator.c
@@ -0,0 +1,73 @@
+/***
+ 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 "fs-util.h"
+#include "log.h"
+#include "string-util.h"
+#include "util.h"
+
+/*
+ * Implements the logic described in
+ * http://freedesktop.org/wiki/Software/systemd/SystemUpdates
+ */
+
+static const char *arg_dest = "/tmp";
+
+static int generate_symlink(void) {
+ const char *p = NULL;
+
+ if (laccess("/system-update", F_OK) < 0) {
+ if (errno == ENOENT)
+ return 0;
+
+ log_error_errno(errno, "Failed to check for system update: %m");
+ return -EINVAL;
+ }
+
+ p = strjoina(arg_dest, "/default.target");
+ if (symlink(SYSTEM_DATA_UNIT_PATH "/system-update.target", p) < 0)
+ return log_error_errno(errno, "Failed to create symlink %s: %m", p);
+
+ return 0;
+}
+
+int main(int argc, char *argv[]) {
+ int r;
+
+ if (argc > 1 && argc != 4) {
+ log_error("This program takes three or no arguments.");
+ return EXIT_FAILURE;
+ }
+
+ if (argc > 1)
+ arg_dest = argv[2];
+
+ log_set_target(LOG_TARGET_SAFE);
+ log_parse_environment();
+ log_open();
+
+ umask(0022);
+
+ r = generate_symlink();
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}