[v3] cmd: ubi: add a command to rename volume

This commit adds 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:
v3:
- use IS_ENABLED instead of #ifdef (feedback from Simon)
- fix comment (feedback from Simon)
v2:
- added an option CMD_UBI_RENAME (feedback from Wolfgang)

Hi Philippe,

On Mon, 23 Mar 2020 at 11:12, Philippe Reynes
<philippe.reynes at softathome.com> wrote:
>
> This commit adds 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:
> v3:
> - use IS_ENABLED instead of #ifdef (feedback from Simon)
> - fix comment (feedback from Simon)
> 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..c9ae208 100644
> --- a/cmd/ubi.c
> +++ b/cmd/ubi.c
> @@ -251,6 +251,41 @@ out_err:
>         return err;
>  }
>
> +#if IS_ENABLED(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
> +
>  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]);
>         }
>
> +#if IS_ENABLED(CONFIG_CMD_UBI_RENAME)

Sorry, I meant if(), not #if. That should allow you to get rid of the
#ifdef above.

> +       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"
> +#if IS_ENABLED(CONFIG_CMD_UBI_RENAME)
> +       "ubi rename oldname newname\n"
> +#endif

Unfortunately this one is still needed, but it is just help so build
coverage is less important.

>         "ubi skipcheck volume on/off - Set or clear skip_check flag in volume header\n"
>         "[Legends]\n"
>         " volume: character name\n"
> --
> 2.7.4
>

Regards,
Simon