t5704: problem with OS X sed

t5704's newest test has always failed for my on OS X.  It's taken a little while for me to find the time to try to fix it.  Unfortunately, my sed-fu has proven not up to the task:

sed: 1: "/^-/{p;q}": extra characters at the end of q command not ok - 7 ridiculously long subject in boundary # # : >file4 && # test_tick && # git add file4 && # printf "%01200d # " 0 | git commit -F - && # test_commit fifth && # git bundle create long-subject-bundle.bdl HEAD^..HEAD && # git bundle list-heads long-subject-bundle.bdl >heads && # test -s heads && # git fetch long-subject-bundle.bdl && # sed -n "/^-/{p;q}" long-subject-bundle.bdl >boundary && # grep "^-$_x40 " boundary #

I've tried various bits of whitespace or splitting the commands in two, but haven't hit on the proper combination of commands.

Of course, if I remove the sed invocation, I get the following error from grep: "Regular expression too big"

It seems to me that using sed to find a single line and then grepping for it is somewhat redundant.

If someone else has suggestions on how to make this test work on OS X, I'm happy to help test them.

~~ Brian Gernhardt