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);