Re: [PATCH] iotests: Consistent $IMGOPTS boundary matching

[Eric Blake]

On 2/10/21 3:51 AM, Max Reitz wrote:
> To disallow certain refcount_bits values, some _unsupported_imgopts
> invocations look like "refcount_bits=1[^0-9]", i.e. they match an
> integer boundary with [^0-9].  This expression does not match the end of
> the string, though, so it breaks down when refcount_bits is the last
> option (which it tends to be after the rewrite of the check script in
> Python).
> 
> Those invocations could use \b or \> instead, but those are not
> portable.  They could use something like \([^0-9]\|$\), but that would
> be cumbersome.  To make it simple and keep the existing invocations
> working, just let _unsupported_imgopts match the regex against $IMGOPTS
> plus a trailing space.
> 
> Suggested-by: Eric Blake <eblake@redhat.com>
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
> Supersedes "iotests: Fix unsupported_imgopts for refcount_bits", and can
> be reproduced in the same way:
> 
> $ ./check -qcow2 -o refcount_bits=1 7 15 29 58 62 66 68 80
> 
> (those tests should be skipped)
> ---
>  tests/qemu-iotests/common.rc | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)

Much smaller fix ;)

Reviewed-by: Eric Blake <eblake@redhat.com>

> 
> diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
> index 77c37e8312..65cdba5723 100644
> --- a/tests/qemu-iotests/common.rc
> +++ b/tests/qemu-iotests/common.rc
> @@ -885,7 +885,9 @@ _unsupported_imgopts()
>  {
>      for bad_opt
>      do
> -        if echo "$IMGOPTS" | grep -q 2>/dev/null "$bad_opt"
> +        # Add a space so tests can match for whitespace that marks the
> +        # end of an option (\b or \> are not portable)
> +        if echo "$IMGOPTS " | grep -q 2>/dev/null "$bad_opt"
>          then
>              _notrun "not suitable for image option: $bad_opt"
>          fi
> 

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