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[PATCH v17 5/7] bisect: introduce --no-checkout support into porcelain.

From
Jon Seymour <jon.seymour@gmail.com>
Date
Aug 4, 2011, 12:01 UTC
Message-ID
<1312459263-16911-6-git-send-email-jon.seymour@gmail.com>
In-Reply-To
<1312459263-16911-1-git-send-email-jon.seymour@gmail.com>

git-bisect can now perform bisection of a history without performing a checkout at each stage of the bisection process. Instead, HEAD is updated.

One use-case for this function is allow git bisect to be used with damaged repositories where git checkout would fail because the tree referenced by the commit is damaged.

It can also be used in other cases where actual checkout of the tree is not required to progress the bisection.

Improved-by: Christian Couder <chriscool@tuxfamily.org>
Improved-by: Junio C Hamano <gitster@pobox.com>
Improved-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Jon Seymour <jon.seymour@gmail.com>
---
 git-bisect.sh |   48 +++++++++++++++++++++++++++++++++++++-----------
 1 files changed, 37 insertions(+), 11 deletions(-)
diff --git a/git-bisect.sh b/git-bisect.sh
index a44ffe1..b9c18dd 100755
--- a/git-bisect.sh
+++ b/git-bisect.sh
@@ -3,7 +3,7 @@
 USAGE='[help|start|bad|good|skip|next|reset|visualize|replay|log|run]'
 LONG_USAGE='git bisect help
         print this long help message.
-git bisect start [<bad> [<good>...]] [--] [<pathspec>...]
+git bisect start [--no-checkout] [<bad> [<good>...]] [--] [<pathspec>...]
         reset bisect state and start bisection.
 git bisect bad [<rev>]
         mark <rev> a known-bad revision.
@@ -34,6 +34,16 @@ require_work_tree
 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
 
+bisect_head()
+{
+	if test -f "$GIT_DIR/BISECT_HEAD"
+	then
+		echo BISECT_HEAD
+	else
+		echo HEAD
+	fi
+}
+
 bisect_autostart() {
 	test -s "$GIT_DIR/BISECT_START" || {
 		(
@@ -69,6 +79,7 @@ bisect_start() {
 	orig_args=$(git rev-parse --sq-quote "$@")
 	bad_seen=0
 	eval=''
+	mode=''
 	while [ $# -gt 0 ]; do
 	    arg="$1"
 	    case "$arg" in
@@ -76,6 +87,11 @@ bisect_start() {
 		shift
 		break
 		;;
+	    --no-checkout)
+		mode=--no-checkout
+		shift ;;
+	    --*)
+		die "$(eval_gettext "unrecognised option: '\$arg'")" ;;
 	    *)
 		rev=$(git rev-parse -q --verify "$arg^{commit}") || {
 		    test $has_double_dash -eq 1 &&
@@ -107,7 +123,10 @@ bisect_start() {
 	then
 		# Reset to the rev from where we started.
 		start_head=$(cat "$GIT_DIR/BISECT_START")
-		git checkout "$start_head" -- || exit
+		if test "z$mode" != "z--no-checkout"
+		then
+		    git checkout "$start_head" --
+		fi
 	else
 		# Get rev from where we start.
 		case "$head" in
@@ -143,7 +162,10 @@ bisect_start() {
 	#
 	# Write new start state.
 	#
-	echo "$start_head" >"$GIT_DIR/BISECT_START" &&
+	echo "$start_head" >"$GIT_DIR/BISECT_START" && {
+		test "z$mode" != "z--no-checkout" ||
+		git update-ref --no-deref BISECT_HEAD "$start_head"
+	} &&
 	git rev-parse --sq-quote "$@" >"$GIT_DIR/BISECT_NAMES" &&
 	eval "$eval true" &&
 	echo "git bisect start$orig_args" >>"$GIT_DIR/BISECT_LOG" || exit
@@ -206,8 +228,8 @@ bisect_state() {
 	0,*)
 		die "$(gettext "Please call 'bisect_state' with at least one argument.")" ;;
 	1,bad|1,good|1,skip)
-		rev=$(git rev-parse --verify HEAD) ||
-			die "$(gettext "Bad rev input: HEAD")"
+		rev=$(git rev-parse --verify $(bisect_head)) ||
+			die "$(gettext "Bad rev input: $(bisect_head)")"
 		bisect_write "$state" "$rev"
 		check_expected_revs "$rev" ;;
 	2,bad|*,good|*,skip)
@@ -291,7 +313,7 @@ bisect_next() {
 	bisect_next_check good
 
 	# Perform all bisection computation, display and checkout
-	git bisect--helper --next-all
+	git bisect--helper --next-all $(test -f "$GIT_DIR/BISECT_HEAD" && echo --no-checkout)
 	res=$?
 
         # Check if we should exit because bisection is finished
@@ -340,12 +362,15 @@ bisect_reset() {
 	*)
 	    usage ;;
 	esac
-	if git checkout "$branch" -- ; then
-		bisect_clean_state
-	else
-		die "$(eval_gettext "Could not check out original HEAD '\$branch'.
+	if ! test -f "$GIT_DIR/BISECT_HEAD"
+	then
+		if ! git checkout "$branch" --
+		then
+			die "$(eval_gettext "Could not check out original HEAD '\$branch'.
 Try 'git bisect reset <commit>'.")"
+		fi
 	fi
+	bisect_clean_state
 }
 
 bisect_clean_state() {
@@ -362,7 +387,8 @@ bisect_clean_state() {
 	rm -f "$GIT_DIR/BISECT_RUN" &&
 	# Cleanup head-name if it got left by an old version of git-bisect
 	rm -f "$GIT_DIR/head-name" &&
-
+	git update-ref -d --no-deref BISECT_HEAD &&
+	# clean up BISECT_START last
 	rm -f "$GIT_DIR/BISECT_START"
 }
 

-- 
1.7.6.353.g50d6f
Previous: Jon SeymourNext: Jon Seymour
Message 10 of 12 in “bisect: Add support for --no-checkout option”
  1. 0/7 bisect: Add support for --no-checkout optionJon Seymour, Aug 4, 2011
  2. 1/7 bisect: move argument parsing before state modification.Jon Seymour, Aug 4, 2011
  3. Christian CouderSep 7, 2011
  4. Junio C HamanoSep 7, 2011
  5. Johannes SixtSep 7, 2011
  6. Jon SeymourSep 8, 2011
  7. 2/7 bisect: use && to connect statements that are deferred with eval.Jon Seymour, Aug 4, 2011
  8. 3/7 bisect: add tests to document expected behaviour in presence of broken trees.Jon Seymour, Aug 4, 2011
  9. 4/7 bisect: introduce support for --no-checkout option.Jon Seymour, Aug 4, 2011
  10. 5/7 bisect: introduce --no-checkout support into porcelain.Jon Seymour, Aug 4, 2011
  11. 6/7 bisect: add tests for the --no-checkout option.Jon Seymour, Aug 4, 2011
  12. 7/7 bisect: add documentation for --no-checkout option.Jon Seymour, Aug 4, 2011

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