Re: [PATCH 18/18] iotests: Allow check -o data_file

[Maxim Levitsky <mlevitsk@redhat.com>]

On Fri, 2019-09-27 at 11:42 +0200, Max Reitz wrote:
> The problem with allowing the data_file option is that you want to use a
> different data file per image used in the test.  Therefore, we need to
> allow patterns like -o data_file='$TEST_IMG.data_file'.
> 
> Then, we need to filter it out from qemu-img map, qemu-img create, and
> remove the data file in _rm_test_img.
> 
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
>  tests/qemu-iotests/common.filter | 21 +++++++++++++++++++--
>  tests/qemu-iotests/common.rc     | 10 +++++++++-
>  2 files changed, 28 insertions(+), 3 deletions(-)
> 
> diff --git a/tests/qemu-iotests/common.filter b/tests/qemu-iotests/common.filter
> index 841f7642af..a11f9a8972 100644
> --- a/tests/qemu-iotests/common.filter
> +++ b/tests/qemu-iotests/common.filter
> @@ -115,7 +115,15 @@ _filter_actual_image_size()
>  # replace driver-specific options in the "Formatting..." line
>  _filter_img_create()
>  {
> -    $SED -e "s#$REMOTE_TEST_DIR#TEST_DIR#g" \
> +    data_file_filter=()
> +    if echo "$IMGOPTS" | grep -q 'data_file='; then
> +        data_file=$(echo "$IMGOPTS" | sed -e 's/.*\(data_file=[^,]*\).*/\1/' \
> +                                          -e "s#\\\$TEST_IMG#$TEST_IMG#")
Could you maybe add a comment on this regular expression, similar
to what is in the commit message?

> +        data_file_filter=(-e "s# $data_file##")
Why to use array here? A variable would work too I think.
> +    fi
> +
> +    $SED "${data_file_filter[@]}" \
> +        -e "s#$REMOTE_TEST_DIR#TEST_DIR#g" \
>          -e "s#$IMGPROTO:$TEST_DIR#TEST_DIR#g" \
>          -e "s#$TEST_DIR#TEST_DIR#g" \
>          -e "s#$IMGFMT#IMGFMT#g" \
> @@ -198,9 +206,18 @@ _filter_img_info()
>  # human and json output
>  _filter_qemu_img_map()
>  {
> +    data_file_filter=()
> +    if echo "$IMGOPTS" | grep -q 'data_file='; then
> +        data_file_pattern=$(echo "$IMGOPTS" | sed -e 's/.*data_file=\([^,]*\).*/\1/' \
> +                                                  -e 's#\$TEST_IMG#\\(.*\\)#')
> +        data_file_filter=(-e "s#$data_file_pattern#\\1#")
Seems to do the same thing, but in slightly different way.
Maybe make a function to avoid duplication?
I am not 100% sure though.

> +    fi
> +
>      $SED -e 's/\([0-9a-fx]* *[0-9a-fx]* *\)[0-9a-fx]* */\1/g' \
>          -e 's/"offset": [0-9]\+/"offset": OFFSET/g' \
> -        -e 's/Mapped to *//' | _filter_testdir | _filter_imgfmt
> +        -e 's/Mapped to *//' \
> +        "${data_file_filter[@]}" \
> +        | _filter_testdir | _filter_imgfmt
>  }
>  
>  _filter_nbd()
> diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
> index f3784077de..834ece12e4 100644
> --- a/tests/qemu-iotests/common.rc
> +++ b/tests/qemu-iotests/common.rc
> @@ -297,7 +297,8 @@ _make_test_img()
>      fi
>  
>      if [ -n "$IMGOPTS" ]; then
> -        optstr=$(_optstr_add "$optstr" "$IMGOPTS")
> +        imgopts_expanded=$(echo "$IMGOPTS" | sed -e "s#\\\$TEST_IMG#$img_name#")
> +        optstr=$(_optstr_add "$optstr" "$imgopts_expanded")
Also a comment explaining why this is needed would be welcome.

>      fi
>      if [ -n "$IMGKEYSECRET" ]; then
>          object_options="--object secret,id=keysec0,data=$IMGKEYSECRET"
> @@ -376,6 +377,13 @@ _rm_test_img()
>          # Remove all the extents for vmdk
>          "$QEMU_IMG" info "$img" 2>/dev/null | grep 'filename:' | cut -f 2 -d: \
>              | xargs -I {} rm -f "{}"
> +    elif [ "$IMGFMT" = "qcow2" ]; then
> +        # Remove external data file
> +        if echo "$IMGOPTS" | grep -q 'data_file='; then
> +            data_file=$(echo "$IMGOPTS" | sed -e 's/.*data_file=\([^,]*\).*/\1/' \
> +                                              -e "s#\\\$TEST_IMG#$img#")
Same here, even more evidence that it would be nice to move this to a common function.
Again, I am not 100% sure that this is the same regex, but it looks like that.

> +            rm -f "$data_file"
> +        fi
>      fi
>      rm -f "$img"
>  }


Best regards,
	Maxim Levitsky