leandrof/u-boot
1
0
Fork 1
Code Issues Pull Requests Packages Projects Releases Wiki Activity

fs: make it possible to read the filesystem UUID

Browse Source 
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>
This commit is contained in:
Christian Gmeiner
2014-11-12 14:35:04 +01:00
committed by Tom Rini
parent 1b51d32c0f
commit 59e890ef7b
7 changed files with 94 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
common/Makefile
View File

@@ -188,6 +188,7 @@ obj-y += usb.o usb_hub.o
obj-$(CONFIG_USB_STORAGE) += usb_storage.o
endif
obj-$(CONFIG_CMD_FASTBOOT) += cmd_fastboot.o
obj-$(CONFIG_CMD_FS_UUID) += cmd_fs_uuid.o
obj-$(CONFIG_CMD_USB_MASS_STORAGE) += cmd_usb_mass_storage.o
obj-$(CONFIG_CMD_THOR_DOWNLOAD) += cmd_thordown.o

26
common/cmd_fs_uuid.c Normal file
View File

@@ -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"
);