[OSS-Tools] [PATCH 2/4] state: implement helper to find device path from diskuuid

[Michael Olbrich <m.olbrich@pengutronix.de>]

Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>
---

I didn't find a good place for this helper. It has nothing to do with
device trees and I didn't want to add it to code that is shared with
barebox. If there is a better place for it then I don't mind moving it.

Michael

 Makefile.am                |  1 +
 src/barebox-state-compat.c | 64 ++++++++++++++++++++++++++++++++++++++
 src/libbb.h                |  2 ++
 3 files changed, 67 insertions(+)
 create mode 100644 src/barebox-state-compat.c

diff --git a/Makefile.am b/Makefile.am
index d53ee7c6f9c3..a9eb0fd304eb 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -55,6 +55,7 @@ barebox_state_SOURCES = \
 	src/barebox-state/state.c \
 	src/barebox-state/state.h \
 	src/barebox-state/state_variables.c \
+	src/barebox-state-compat.c \
 	src/barebox-state.c \
 	src/barebox-state.h \
 	\
diff --git a/src/barebox-state-compat.c b/src/barebox-state-compat.c
new file mode 100644
index 000000000000..1ed8fefa2253
--- /dev/null
+++ b/src/barebox-state-compat.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2022 Pengutronix, Michael Olbrich <m.olbrich@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program 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 General Public License for more details.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <libudev.h>
+
+int devpath_from_diskuuid(const char *diskuuid, char **devpath)
+{
+	struct udev *udev;
+	struct udev_enumerate *enumerate;
+	struct udev_list_entry *devices, *dev_list_entry;
+	int ret = 0;
+
+	udev = udev_new();
+	if (!udev) {
+		  fprintf(stderr, "Can't create udev\n");
+		  return -ENODEV;
+	}
+
+	enumerate = udev_enumerate_new(udev);
+	udev_enumerate_add_match_subsystem(enumerate, "block");
+	udev_enumerate_scan_devices(enumerate);
+	devices = udev_enumerate_get_list_entry(enumerate);
+	udev_list_entry_foreach(dev_list_entry, devices) {
+		const char *path, *devtype, *outpath, *uuid;
+		struct udev_device *device;
+
+		path = udev_list_entry_get_name(dev_list_entry);
+		device = udev_device_new_from_syspath(udev, path);
+
+		/* distinguish device (disk) from partitions */
+		devtype = udev_device_get_devtype(device);
+		if (!devtype)
+			continue;
+		if (strcmp(devtype, "disk"))
+			continue;
+
+		uuid = udev_device_get_property_value(device, "ID_PART_TABLE_UUID");
+		if (!strcmp(uuid, diskuuid)) {
+			outpath = udev_device_get_devnode(device);
+			*devpath = strdup(outpath);
+			goto out;
+		}
+	}
+	ret = -ENODEV;
+
+out:
+	udev_enumerate_unref(enumerate);
+	udev_unref(udev);
+
+	return ret;
+}
diff --git a/src/libbb.h b/src/libbb.h
index 9f9d32d12d94..5350341d2281 100644
--- a/src/libbb.h
+++ b/src/libbb.h
@@ -3,4 +3,6 @@
 
 #include <dt/common.h>
 
+int devpath_from_diskuuid(const char *diskuuid, char **devpath);
+
 #endif
-- 
2.30.2


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