Re: [PATCH] bisect: fix replay of CRLF logs

[Junio C Hamano <gitster@pobox.com>]

Junio C Hamano <gitster@pobox.com> writes:

> I wonder if we can add a CR to IFS so that the parsing logic of each
> line would not even see it?

So I got curious and tried this; it seems to pass Christopher's test
(corrected with Eric's suggestion).

As the implementation changed, I ended up rewriting some parts of
the log message originally proposed and here is what I tentatively
queued.

-- >8 --
From: Christopher Warrington <chwarr@microsoft.com>
Subject: [PATCH] bisect: allow CRLF line endings in "git bisect replay" input

We advertise that the bisect log can be corrected in your editor
before being fed to "git bisect replay", but some editors may
turn the line endings to CRLF.

Update the parser of the input lines so that the CR at the end of
the line gets ignored.

Were anyone to intentionally be using terms/revs with embedded CRs,
replaying such bisects will no longer work with this change. I suspect
that this is incredibly rare.

Signed-off-by: Christopher Warrington <chwarr@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 git-bisect.sh               | 2 ++
 t/t6030-bisect-porcelain.sh | 7 +++++++
 2 files changed, 9 insertions(+)

diff --git a/git-bisect.sh b/git-bisect.sh
index efee12b8b1..56548d4be7 100755
--- a/git-bisect.sh
+++ b/git-bisect.sh
@@ -209,6 +209,7 @@ bisect_replay () {
 	test "$#" -eq 1 || die "$(gettext "No logfile given")"
 	test -r "$file" || die "$(eval_gettext "cannot read \$file for replaying")"
 	git bisect--helper --bisect-reset || exit
+	oIFS="$IFS" IFS="$IFS:$(printf '\015')"
 	while read git bisect command rev
 	do
 		test "$git $bisect" = "git bisect" || test "$git" = "git-bisect" || continue
@@ -232,6 +233,7 @@ bisect_replay () {
 			die "$(gettext "?? what are you talking about?")" ;;
 		esac
 	done <"$file"
+	IFS="$oIFS"
 	bisect_auto_next
 }
 
diff --git a/t/t6030-bisect-porcelain.sh b/t/t6030-bisect-porcelain.sh
index 821a0c88cf..bb84c8a411 100755
--- a/t/t6030-bisect-porcelain.sh
+++ b/t/t6030-bisect-porcelain.sh
@@ -792,6 +792,13 @@ test_expect_success 'bisect replay with old and new' '
 	git bisect reset
 '
 
+test_expect_success 'bisect replay with CRLF log' '
+	append_cr <log_to_replay.txt >log_to_replay_crlf.txt &&
+	git bisect replay log_to_replay_crlf.txt >bisect_result_crlf &&
+	grep "$HASH2 is the first new commit" bisect_result_crlf &&
+	git bisect reset
+'
+
 test_expect_success 'bisect cannot mix old/new and good/bad' '
 	git bisect start &&
 	git bisect bad $HASH4 &&
-- 
2.26.2-561-g07d8ea56f2