[PATCH v2] cmd: ubi: add a command to rename volume

[Philippe Reynes]

This commit add the command ubi rename to rename an ubi volume.
The format of the command is: ubi rename <oldname> <newname>.
To enable this command, the option CMD_UBI_RENAME must be selected.

Signed-off-by: Philippe Reynes <philippe.reynes at softathome.com>
---
 cmd/Kconfig |  8 ++++++++
 cmd/ubi.c   | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)

Changelog:
v2:
- added an option CMD_UBI_RENAME (feedback from Wolfgang)

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 6403bc4..1564694 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -2172,6 +2172,14 @@ config CMD_UBI
 	  It is also strongly encouraged to also enable CONFIG_MTD to get full
 	  partition support.
 
+config CMD_UBI_RENAME
+       bool "Enable rename"
+       depends on CMD_UBI
+       default n
+       help
+         Enable a "ubi" command to rename ubi volume:
+	   ubi rename <oldname> <newname>
+
 config CMD_UBIFS
 	tristate "Enable UBIFS - Unsorted block images filesystem commands"
 	depends on CMD_UBI
diff --git a/cmd/ubi.c b/cmd/ubi.c
index cecf251..4885661 100644
--- a/cmd/ubi.c
+++ b/cmd/ubi.c
@@ -251,6 +251,41 @@ out_err:
 	return err;
 }
 
+#ifdef CONFIG_CMD_UBI_RENAME
+static int ubi_rename_vol(char *oldname, char *newname)
+{
+	struct ubi_volume *vol;
+	struct ubi_rename_entry rename;
+	struct ubi_volume_desc desc;
+	struct list_head list;
+
+	vol = ubi_find_volume(oldname);
+	if (!vol) {
+		printf("%s: volume %s doesn't exist\n", __func__, oldname);
+		return ENODEV;
+	}
+
+	printf("Rename UBI volume %s to %s\n", oldname, newname);
+
+	if (ubi->ro_mode) {
+		printf("%s: ubi device is in read-only mode\n", __func__);
+		return EROFS;
+	}
+
+	rename.new_name_len = strlen(newname);
+	strcpy(rename.new_name, newname);
+	rename.remove = 0;
+	desc.vol = vol;
+	desc.mode = 0;
+	rename.desc = &desc;
+	INIT_LIST_HEAD(&rename.list);
+	INIT_LIST_HEAD(&list);
+	list_add(&rename.list, &list);
+
+	return ubi_rename_volumes(ubi, &list);
+}
+#endif /* CONFIG_CMD_UBI_RENAME */
+
 static int ubi_volume_continue_write(char *volume, void *buf, size_t size)
 {
 	int err = 1;
@@ -604,6 +639,11 @@ static int do_ubi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 			return ubi_remove_vol(argv[2]);
 	}
 
+#ifdef CONFIG_CMD_UBI_RENAME
+	if (strncmp(argv[1], "rename", 6) == 0)
+		return ubi_rename_vol(argv[2], argv[3]);
+#endif
+
 	if (strncmp(argv[1], "skipcheck", 9) == 0) {
 		/* E.g., change skip_check flag */
 		if (argc == 4) {
@@ -692,6 +732,9 @@ U_BOOT_CMD(
 		" - Read volume to address with size\n"
 	"ubi remove[vol] volume"
 		" - Remove volume\n"
+#ifdef CONFIG_CMD_UBI_RENAME
+	"ubi rename oldname newname\n"
+#endif
 	"ubi skipcheck volume on/off - Set or clear skip_check flag in volume header\n"
 	"[Legends]\n"
 	" volume: character name\n"
-- 
2.7.4