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author | Christian Gmeiner <christian.gmeiner@gmail.com> | 2014-11-12 16:35:04 +0300 |
---|---|---|
committer | Tom Rini <trini@ti.com> | 2014-11-23 14:49:01 +0300 |
commit | 59e890ef7bf5b80d96802e115255f969491ef645 (patch) | |
tree | 570d6ef6e5a64a25e3a71eaf67273f8e0b8aa013 /common/cmd_fs_uuid.c | |
parent | 1b51d32c0f0ac7cdcab0ae04d531129a020cc903 (diff) | |
download | u-boot-59e890ef7bf5b80d96802e115255f969491ef645.tar.xz |
fs: make it possible to read the filesystem UUID
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>
Diffstat (limited to 'common/cmd_fs_uuid.c')
-rw-r--r-- | common/cmd_fs_uuid.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/common/cmd_fs_uuid.c b/common/cmd_fs_uuid.c new file mode 100644 index 0000000000..613f3a4f3d --- /dev/null +++ b/common/cmd_fs_uuid.c @@ -0,0 +1,26 @@ +/* + * 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" +); |