[U-Boot] [PATCH 1/4] fs: Add command to retrieve the filesystem type

[Stephen Warren <swarren@wwwdotorg.org>]

On 01/05/2015 10:13 AM, Sjoerd Simons wrote:
> New command to determine the filesystem type of a given partition.
> Optionally stores the filesystem type in a environment variable.

> diff --git a/common/cmd_fs.c b/common/cmd_fs.c

> +U_BOOT_CMD(
> +	fstype, 4, 1, do_fstype_wrapper,
> +	"Look up a filesystem type",
> +	"<interface> <dev>:<part>\n"

Should this line ...

> +	"- print filesystem type\n"
> +	"fstype <interface> <dev>:<part> <varname>\n"

... be consistent with this one - namely either both or neither include 
"fstype" at the start?

> diff --git a/fs/fs.c b/fs/fs.c

> +int do_fs_type(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
> +{
> +	struct fstype_info *info;
> +
> +	if (argc < 3 || argc > 4)
> +		return CMD_RET_USAGE;
> +
> +	if (fs_set_blk_dev(argv[1], argv[2], FS_TYPE_ANY))
> +		return 1;
> +
> +	info = fs_get_info(fs_type);
> +
> +	if (argc == 4)
> +		setenv(argv[3], info->name);
> +	else
> +		printf("%s\n", info->name);
> +
> +	return CMD_RET_SUCCESS;
> +}

That function has both the cmdline interface and implementation logic in 
one place. Many of the other features (read, write, ls, ...) separate 
them out into two functions so that U-Boot code can call the 
implementation, and shell code can call the cmdline parsing wrapper. 
Should we do the same here? Admittedly, the implementation would be 
pretty simple, but perhaps it's still useful?

I don't feel that strongly though, and we can easily refactor that later 
if required.