Re: [PATCH 1/2] t8005: avoid grep on non-ASCII data

On Sun, Feb 21, 2016 at 06:19:14PM -0500, Jeff King wrote:

On Sun, Feb 21, 2016 at 04:01:27PM -0500, Eric Sunshine wrote:

quoted

On Sun, Feb 21, 2016 at 12:32 PM, John Keeping [off-list ref] wrote:

quoted

GNU grep 2.23 detects the input used in this test as binary data so it
does not work for extracting lines from a file.  We could add the "-a"
option to force grep to treat the input as text, but not all
implementations support that.  Instead, use sed to extract the desired
lines since it will always treat its input as text.

While touching these lines, modernize the test style to avoid hiding the
exit status of "git blame" and remove a space following a redirection
operator.

Signed-off-by: John Keeping <redacted>
---

diff --git a/t/t8005-blame-i18n.sh b/t/t8005-blame-i18n.sh

@@ -35,8 +35,8 @@ EOF
 test_expect_success !MINGW \
        'blame respects i18n.commitencoding' '
-       git blame --incremental file | \
-               egrep "^(author|summary) " > actual &&
+       git blame --incremental file >output &&
+       sed -ne "/^\(author\|summary\) /p" output >actual &&

These tests all crash and burn with BSD sed (including Mac OS X) since
you're not restricting yourself to BRE (basic regular expressions).
You _could_ request extended regular expressions, which do work on
those platforms, as well as with GNU sed:

    sed -nEe "/^(author|summary) /p" ...

At that point, I think we may as well use grep, because obscure
platforms are probably broken either way.

Also GNU sed doesn't understand "-E", it uses "-r" for --regexp-extended.

I'm tempted to just go the perl route. We already depend on at least a
baisc version of perl5 being installed for many of the other tests, so
it's not really introducing a new dependency.

Something like the patch below works for me. I think we could make it
shorter by using $PERLIO to get the raw behavior, but using binmode will
work even on ancient versions of perl.

John, if you agree on the direction, feel free to combine it with your
patch.

My original sed version was:

	sed -ne "/^author /p" -e "/^summary /p"

which I think will work on all platforms (we already use it in
t0000-basic.sh) but then I decided to be too clever :-(

I still think sed is simpler than introducing a new function to wrap a
perl script.