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-rw-r--r--src/shared/volatile-util.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/src/shared/volatile-util.c b/src/shared/volatile-util.c
new file mode 100644
index 0000000..3323897
--- /dev/null
+++ b/src/shared/volatile-util.c
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+
+#include "alloc-util.h"
+#include "macro.h"
+#include "parse-util.h"
+#include "proc-cmdline.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "volatile-util.h"
+
+int query_volatile_mode(VolatileMode *ret) {
+ _cleanup_free_ char *mode = NULL;
+ int r;
+
+ r = proc_cmdline_get_key("systemd.volatile", PROC_CMDLINE_VALUE_OPTIONAL, &mode);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ *ret = VOLATILE_NO;
+ return 0;
+ }
+
+ if (mode) {
+ VolatileMode m;
+
+ m = volatile_mode_from_string(mode);
+ if (m < 0)
+ return -EINVAL;
+
+ *ret = m;
+ } else
+ *ret = VOLATILE_YES;
+
+ return 1;
+}
+
+static const char* const volatile_mode_table[_VOLATILE_MODE_MAX] = {
+ [VOLATILE_NO] = "no",
+ [VOLATILE_YES] = "yes",
+ [VOLATILE_STATE] = "state",
+ [VOLATILE_OVERLAY] = "overlay",
+};
+
+DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(volatile_mode, VolatileMode, VOLATILE_YES);