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-rw-r--r--src/shared/reboot-util.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/src/shared/reboot-util.c b/src/shared/reboot-util.c
new file mode 100644
index 0000000..756f9d3
--- /dev/null
+++ b/src/shared/reboot-util.c
@@ -0,0 +1,109 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "fileio.h"
+#include "log.h"
+#include "proc-cmdline.h"
+#include "raw-reboot.h"
+#include "reboot-util.h"
+#include "string-util.h"
+#include "umask-util.h"
+#include "virt.h"
+
+int update_reboot_parameter_and_warn(const char *parameter, bool keep) {
+ int r;
+
+ if (isempty(parameter)) {
+ if (keep)
+ return 0;
+
+ if (unlink("/run/systemd/reboot-param") < 0) {
+ if (errno == ENOENT)
+ return 0;
+
+ return log_warning_errno(errno, "Failed to unlink reboot parameter file: %m");
+ }
+
+ return 0;
+ }
+
+ RUN_WITH_UMASK(0022) {
+ r = write_string_file("/run/systemd/reboot-param", parameter,
+ WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to write reboot parameter file: %m");
+ }
+
+ return 0;
+}
+
+int read_reboot_parameter(char **parameter) {
+ int r;
+
+ assert(parameter);
+
+ r = read_one_line_file("/run/systemd/reboot-param", parameter);
+ if (r < 0 && r != -ENOENT)
+ return log_debug_errno(r, "Failed to read /run/systemd/reboot-param: %m");
+
+ return 0;
+}
+
+int reboot_with_parameter(RebootFlags flags) {
+ int r;
+
+ /* Reboots the system with a parameter that is read from /run/systemd/reboot-param. Returns 0 if
+ * REBOOT_DRY_RUN was set and the actual reboot operation was hence skipped. If REBOOT_FALLBACK is
+ * set and the reboot with parameter doesn't work out a fallback to classic reboot() is attempted. If
+ * REBOOT_FALLBACK is not set, 0 is returned instead, which should be considered indication for the
+ * caller to fall back to reboot() on its own, or somehow else deal with this. If REBOOT_LOG is
+ * specified will log about what it is going to do, as well as all errors. */
+
+ if (detect_container() == 0) {
+ _cleanup_free_ char *parameter = NULL;
+
+ r = read_one_line_file("/run/systemd/reboot-param", &parameter);
+ if (r < 0 && r != -ENOENT)
+ log_full_errno(flags & REBOOT_LOG ? LOG_WARNING : LOG_DEBUG, r,
+ "Failed to read reboot parameter file, ignoring: %m");
+
+ if (!isempty(parameter)) {
+ log_full(flags & REBOOT_LOG ? LOG_INFO : LOG_DEBUG,
+ "Rebooting with argument '%s'.", parameter);
+
+ if (flags & REBOOT_DRY_RUN)
+ return 0;
+
+ (void) raw_reboot(LINUX_REBOOT_CMD_RESTART2, parameter);
+
+ log_full_errno(flags & REBOOT_LOG ? LOG_WARNING : LOG_DEBUG, errno,
+ "Failed to reboot with parameter, retrying without: %m");
+ }
+ }
+
+ if (!(flags & REBOOT_FALLBACK))
+ return 0;
+
+ log_full(flags & REBOOT_LOG ? LOG_INFO : LOG_DEBUG, "Rebooting.");
+
+ if (flags & REBOOT_DRY_RUN)
+ return 0;
+
+ (void) reboot(RB_AUTOBOOT);
+
+ return log_full_errno(flags & REBOOT_LOG ? LOG_ERR : LOG_DEBUG, errno, "Failed to reboot: %m");
+}
+
+int shall_restore_state(void) {
+ bool ret;
+ int r;
+
+ r = proc_cmdline_get_bool("systemd.restore_state", &ret);
+ if (r < 0)
+ return r;
+
+ return r > 0 ? ret : true;
+}