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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
/*
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* cmd_fs_uuid.c -- fsuuid command
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*
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* Copyright (C) 2014, Bachmann electronic GmbH
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <fs.h>
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static int do_fs_uuid_wrapper(cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[])
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{
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return do_fs_uuid(cmdtp, flag, argc, argv, FS_TYPE_ANY);
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}
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U_BOOT_CMD(
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fsuuid, 4, 1, do_fs_uuid_wrapper,
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"Look up a filesystem UUID",
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"<interface> <dev>:<part>\n"
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" - print filesystem UUID\n"
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"fsuuid <interface> <dev>:<part> <varname>\n"
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" - set environment variable to filesystem UUID\n"
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);
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