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bisect: introduce --no-checkout support into porcelain.

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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>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jon Seymour 2011-08-04 22:01:01 +10:00 committed by Junio C Hamano
parent fee92fc1dd
commit 4796e823a3
1 changed files with 37 additions and 11 deletions
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48
git-bisect.sh
View file

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