1 files changed, 49 insertions, 0 deletions
diff --git a/src/udev/udevadm-util.c b/src/udev/udevadm-util.c
new file mode 100644
index 0000000..557982b
--- /dev/null
+++ b/src/udev/udevadm-util.c
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#include <errno.h>
+
+#include "alloc-util.h"
+#include "device-private.h"
+#include "path-util.h"
+#include "udevadm-util.h"
+#include "unit-name.h"
+
+int find_device(const char *id, const char *prefix, sd_device **ret) {
+        _cleanup_free_ char *path = NULL;
+        int r;
+
+        assert(id);
+        assert(ret);
+
+        if (prefix) {
+                if (!path_startswith(id, prefix)) {
+                        id = path = path_join(prefix, id);
+                        if (!path)
+                                return -ENOMEM;
+                }
+        } else {
+                /* In cases where the argument is generic (no prefix specified),
+                 * check if the argument looks like a device unit name. */
+                if (unit_name_is_valid(id, UNIT_NAME_PLAIN) &&
+                    unit_name_to_type(id) == UNIT_DEVICE) {
+                        r = unit_name_to_path(id, &path);
+                        if (r < 0)
+                                return log_debug_errno(r, "Failed to convert \"%s\" to a device path: %m", id);
+                        id = path;
+                }
+        }
+
+        if (path_startswith(id, "/sys/"))
+                return sd_device_new_from_syspath(ret, id);
+
+        if (path_startswith(id, "/dev/")) {
+                struct stat st;
+
+                if (stat(id, &st) < 0)
+                        return -errno;
+
+                return device_new_from_stat_rdev(ret, &st);
+        }
+
+        return -EINVAL;
+}