Re: [PATCH v3] iotests: Drop readlink -f

[Eric Blake <eblake@redhat.com>]

On 9/14/20 9:56 AM, Max Reitz wrote:
> On macOS, (out of the box) readlink does not have -f.  We do not really
> need readlink here, though, it was just a replacement for realpath
> (which is not available on our BSD test systems), which we needed to
> make the $(dirname) into an absolute path.
> 
> Instead of using either, just use "cd; pwd" like is done for
> $source_iotests.
> 
> Fixes: b1cbc33a3971b6bb005d5ac3569feae35a71de0f
>         ("iotests: Allow running from different directory")
> Suggested-by: Peter Maydell <peter.maydell@linaro.org>
> Reported-by: Claudio Fontana <cfontana@suse.de>
> Reported-by: Thomas Huth <thuth@redhat.com>
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
>   tests/qemu-iotests/check | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tests/qemu-iotests/check b/tests/qemu-iotests/check
> index e14a1f354d..678b6e4910 100755
> --- a/tests/qemu-iotests/check
> +++ b/tests/qemu-iotests/check
> @@ -44,7 +44,7 @@ then
>           _init_error "failed to obtain source tree name from check symlink"
>       fi
>       source_iotests=$(cd "$source_iotests"; pwd) || _init_error "failed to enter source tree"
> -    build_iotests=$(readlink -f $(dirname "$0"))
> +    build_iotests=$(cd "$(dirname "$0")"; pwd)

If CDPATH is set, this can produce wrong results.  Do we care?  Probably 
not, since (as you point out), $source_iotests has the same bug, and no 
one has complained yet.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org