mirror of
https://github.com/smaeul/u-boot.git
synced 2025-10-24 01:28:15 +01:00
59e890ef7b
Some filesystems have a UUID stored in its superblock. To
allow using root=UUID=... for the kernel command line we
need a way to read-out the filesystem UUID.
changes rfc -> v1:
- make the environment variable an option parameter. If not
given, the UUID is printed out. If given, it is stored in the env
variable.
- corrected typos
- return error codes
changes v1 -> v2:
- fix return code of do_fs_uuid(..)
- document do_fs_uuid(..)
- implement fs_uuid_unsuported(..) be more consistent with the
way other optional functionality works
changes v2 -> v3:
- change ext4fs_uuid(..) to make use of #if .. #else .. #endif
construct to get rid of unreachable code
Hit any key to stop autoboot: 0
=> fsuuid
fsuuid - Look up a filesystem UUID
Usage:
fsuuid <interface> <dev>:<part>
- print filesystem UUID
fsuuid <interface> <dev>:<part> <varname>
- set environment variable to filesystem UUID
=> fsuuid mmc 0:1
d9f9fc05-45ae-4a36-a616-fccce0e4f887
=> fsuuid mmc 0:2
eb3db83c-7b28-499f-95ce-9e0bb21cda81
=> fsuuid mmc 0:1 uuid1
=> fsuuid mmc 0:2 uuid2
=> printenv uuid1
uuid1=d9f9fc05-45ae-4a36-a616-fccce0e4f887
=> printenv uuid2
uuid2=eb3db83c-7b28-499f-95ce-9e0bb21cda81
=>
Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
27 lines
593 B
C
27 lines
593 B
C
/*
|
|
* cmd_fs_uuid.c -- fsuuid command
|
|
*
|
|
* Copyright (C) 2014, Bachmann electronic GmbH
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <fs.h>
|
|
|
|
static int do_fs_uuid_wrapper(cmd_tbl_t *cmdtp, int flag,
|
|
int argc, char * const argv[])
|
|
{
|
|
return do_fs_uuid(cmdtp, flag, argc, argv, FS_TYPE_ANY);
|
|
}
|
|
|
|
U_BOOT_CMD(
|
|
fsuuid, 4, 1, do_fs_uuid_wrapper,
|
|
"Look up a filesystem UUID",
|
|
"<interface> <dev>:<part>\n"
|
|
" - print filesystem UUID\n"
|
|
"fsuuid <interface> <dev>:<part> <varname>\n"
|
|
" - set environment variable to filesystem UUID\n"
|
|
);
|