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https://github.com/git/git
synced 2024-08-27 19:49:21 +00:00
![Jon Seymour](/assets/img/avatar_default.png)
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>
519 lines
12 KiB
Bash
Executable file
519 lines
12 KiB
Bash
Executable file
#!/bin/sh
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USAGE='[help|start|bad|good|skip|next|reset|visualize|replay|log|run]'
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LONG_USAGE='git bisect help
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print this long help message.
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git bisect start [--no-checkout] [<bad> [<good>...]] [--] [<pathspec>...]
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reset bisect state and start bisection.
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git bisect bad [<rev>]
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mark <rev> a known-bad revision.
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git bisect good [<rev>...]
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mark <rev>... known-good revisions.
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git bisect skip [(<rev>|<range>)...]
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mark <rev>... untestable revisions.
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git bisect next
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find next bisection to test and check it out.
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git bisect reset [<commit>]
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finish bisection search and go back to commit.
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git bisect visualize
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show bisect status in gitk.
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git bisect replay <logfile>
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replay bisection log.
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git bisect log
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show bisect log.
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git bisect run <cmd>...
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use <cmd>... to automatically bisect.
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Please use "git help bisect" to get the full man page.'
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OPTIONS_SPEC=
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. git-sh-setup
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. git-sh-i18n
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require_work_tree
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_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
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_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
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bisect_head()
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{
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if test -f "$GIT_DIR/BISECT_HEAD"
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then
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echo BISECT_HEAD
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else
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echo HEAD
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fi
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}
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bisect_autostart() {
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test -s "$GIT_DIR/BISECT_START" || {
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(
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gettext "You need to start by \"git bisect start\"" &&
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echo
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) >&2
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if test -t 0
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then
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# TRANSLATORS: Make sure to include [Y] and [n] in your
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# translation. The program will only accept English input
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# at this point.
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gettext "Do you want me to do it for you [Y/n]? " >&2
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read yesno
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case "$yesno" in
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[Nn]*)
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exit ;;
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esac
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bisect_start
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else
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exit 1
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fi
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}
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}
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bisect_start() {
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#
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# Check for one bad and then some good revisions.
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#
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has_double_dash=0
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for arg; do
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case "$arg" in --) has_double_dash=1; break ;; esac
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done
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orig_args=$(git rev-parse --sq-quote "$@")
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bad_seen=0
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eval=''
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mode=''
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while [ $# -gt 0 ]; do
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arg="$1"
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case "$arg" in
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--)
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shift
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break
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;;
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--no-checkout)
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mode=--no-checkout
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shift ;;
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--*)
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die "$(eval_gettext "unrecognised option: '\$arg'")" ;;
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*)
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rev=$(git rev-parse -q --verify "$arg^{commit}") || {
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test $has_double_dash -eq 1 &&
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die "$(eval_gettext "'\$arg' does not appear to be a valid revision")"
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break
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}
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case $bad_seen in
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0) state='bad' ; bad_seen=1 ;;
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*) state='good' ;;
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esac
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eval="$eval bisect_write '$state' '$rev' 'nolog' &&"
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shift
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;;
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esac
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done
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#
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# Verify HEAD.
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#
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head=$(GIT_DIR="$GIT_DIR" git symbolic-ref -q HEAD) ||
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head=$(GIT_DIR="$GIT_DIR" git rev-parse --verify HEAD) ||
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die "$(gettext "Bad HEAD - I need a HEAD")"
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#
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# Check if we are bisecting.
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#
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start_head=''
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if test -s "$GIT_DIR/BISECT_START"
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then
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# Reset to the rev from where we started.
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start_head=$(cat "$GIT_DIR/BISECT_START")
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if test "z$mode" != "z--no-checkout"
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then
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git checkout "$start_head" --
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fi
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else
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# Get rev from where we start.
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case "$head" in
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refs/heads/*|$_x40)
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# This error message should only be triggered by
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# cogito usage, and cogito users should understand
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# it relates to cg-seek.
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[ -s "$GIT_DIR/head-name" ] &&
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die "$(gettext "won't bisect on seeked tree")"
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start_head="${head#refs/heads/}"
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;;
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*)
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die "$(gettext "Bad HEAD - strange symbolic ref")"
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;;
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esac
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fi
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#
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# Get rid of any old bisect state.
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#
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bisect_clean_state || exit
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#
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# Change state.
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# In case of mistaken revs or checkout error, or signals received,
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# "bisect_auto_next" below may exit or misbehave.
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# We have to trap this to be able to clean up using
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# "bisect_clean_state".
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#
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trap 'bisect_clean_state' 0
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trap 'exit 255' 1 2 3 15
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#
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# Write new start state.
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#
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echo "$start_head" >"$GIT_DIR/BISECT_START" && {
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test "z$mode" != "z--no-checkout" ||
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git update-ref --no-deref BISECT_HEAD "$start_head"
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} &&
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git rev-parse --sq-quote "$@" >"$GIT_DIR/BISECT_NAMES" &&
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eval "$eval true" &&
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echo "git bisect start$orig_args" >>"$GIT_DIR/BISECT_LOG" || exit
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#
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# Check if we can proceed to the next bisect state.
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#
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bisect_auto_next
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trap '-' 0
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}
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bisect_write() {
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state="$1"
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rev="$2"
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nolog="$3"
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case "$state" in
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bad) tag="$state" ;;
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good|skip) tag="$state"-"$rev" ;;
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*) die "$(eval_gettext "Bad bisect_write argument: \$state")" ;;
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esac
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git update-ref "refs/bisect/$tag" "$rev" || exit
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echo "# $state: $(git show-branch $rev)" >>"$GIT_DIR/BISECT_LOG"
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test -n "$nolog" || echo "git bisect $state $rev" >>"$GIT_DIR/BISECT_LOG"
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}
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is_expected_rev() {
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test -f "$GIT_DIR/BISECT_EXPECTED_REV" &&
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test "$1" = $(cat "$GIT_DIR/BISECT_EXPECTED_REV")
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}
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check_expected_revs() {
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for _rev in "$@"; do
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if ! is_expected_rev "$_rev"; then
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rm -f "$GIT_DIR/BISECT_ANCESTORS_OK"
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rm -f "$GIT_DIR/BISECT_EXPECTED_REV"
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return
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fi
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done
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}
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bisect_skip() {
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all=''
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for arg in "$@"
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do
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case "$arg" in
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*..*)
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revs=$(git rev-list "$arg") || die "$(eval_gettext "Bad rev input: \$arg")" ;;
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*)
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revs=$(git rev-parse --sq-quote "$arg") ;;
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esac
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all="$all $revs"
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done
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eval bisect_state 'skip' $all
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}
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bisect_state() {
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bisect_autostart
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state=$1
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case "$#,$state" in
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0,*)
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die "$(gettext "Please call 'bisect_state' with at least one argument.")" ;;
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1,bad|1,good|1,skip)
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rev=$(git rev-parse --verify $(bisect_head)) ||
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die "$(gettext "Bad rev input: $(bisect_head)")"
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bisect_write "$state" "$rev"
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check_expected_revs "$rev" ;;
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2,bad|*,good|*,skip)
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shift
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eval=''
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for rev in "$@"
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do
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sha=$(git rev-parse --verify "$rev^{commit}") ||
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die "$(eval_gettext "Bad rev input: \$rev")"
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eval="$eval bisect_write '$state' '$sha'; "
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done
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eval "$eval"
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check_expected_revs "$@" ;;
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*,bad)
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die "$(gettext "'git bisect bad' can take only one argument.")" ;;
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*)
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usage ;;
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esac
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bisect_auto_next
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}
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bisect_next_check() {
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missing_good= missing_bad=
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git show-ref -q --verify refs/bisect/bad || missing_bad=t
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test -n "$(git for-each-ref "refs/bisect/good-*")" || missing_good=t
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case "$missing_good,$missing_bad,$1" in
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,,*)
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: have both good and bad - ok
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;;
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*,)
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# do not have both but not asked to fail - just report.
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false
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;;
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t,,good)
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# have bad but not good. we could bisect although
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# this is less optimum.
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(
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gettext "Warning: bisecting only with a bad commit." &&
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echo
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) >&2
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if test -t 0
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then
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# TRANSLATORS: Make sure to include [Y] and [n] in your
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# translation. The program will only accept English input
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# at this point.
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gettext "Are you sure [Y/n]? " >&2
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read yesno
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case "$yesno" in [Nn]*) exit 1 ;; esac
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fi
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: bisect without good...
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;;
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*)
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if test -s "$GIT_DIR/BISECT_START"
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then
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(
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gettext "You need to give me at least one good and one bad revisions.
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(You can use \"git bisect bad\" and \"git bisect good\" for that.)" &&
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echo
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) >&2
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else
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(
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gettext "You need to start by \"git bisect start\".
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You then need to give me at least one good and one bad revisions.
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(You can use \"git bisect bad\" and \"git bisect good\" for that.)" &&
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echo
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) >&2
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fi
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exit 1 ;;
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esac
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}
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bisect_auto_next() {
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bisect_next_check && bisect_next || :
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}
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bisect_next() {
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case "$#" in 0) ;; *) usage ;; esac
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bisect_autostart
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bisect_next_check good
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# Perform all bisection computation, display and checkout
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git bisect--helper --next-all $(test -f "$GIT_DIR/BISECT_HEAD" && echo --no-checkout)
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res=$?
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# Check if we should exit because bisection is finished
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test $res -eq 10 && exit 0
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# Check for an error in the bisection process
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test $res -ne 0 && exit $res
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return 0
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}
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bisect_visualize() {
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bisect_next_check fail
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if test $# = 0
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then
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if test -n "${DISPLAY+set}${SESSIONNAME+set}${MSYSTEM+set}${SECURITYSESSIONID+set}" &&
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type gitk >/dev/null 2>&1; then
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set gitk
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else
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set git log
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fi
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else
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case "$1" in
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git*|tig) ;;
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-*) set git log "$@" ;;
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*) set git "$@" ;;
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esac
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fi
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eval '"$@"' --bisect -- $(cat "$GIT_DIR/BISECT_NAMES")
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}
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bisect_reset() {
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test -s "$GIT_DIR/BISECT_START" || {
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gettext "We are not bisecting."; echo
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return
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}
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case "$#" in
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0) branch=$(cat "$GIT_DIR/BISECT_START") ;;
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1) git rev-parse --quiet --verify "$1^{commit}" > /dev/null || {
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invalid="$1"
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die "$(eval_gettext "'\$invalid' is not a valid commit")"
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}
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branch="$1" ;;
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*)
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usage ;;
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esac
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if ! test -f "$GIT_DIR/BISECT_HEAD"
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then
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if ! git checkout "$branch" --
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then
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die "$(eval_gettext "Could not check out original HEAD '\$branch'.
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Try 'git bisect reset <commit>'.")"
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fi
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fi
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bisect_clean_state
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}
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bisect_clean_state() {
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# There may be some refs packed during bisection.
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git for-each-ref --format='%(refname) %(objectname)' refs/bisect/\* |
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while read ref hash
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do
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git update-ref -d $ref $hash || exit
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done
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rm -f "$GIT_DIR/BISECT_EXPECTED_REV" &&
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rm -f "$GIT_DIR/BISECT_ANCESTORS_OK" &&
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rm -f "$GIT_DIR/BISECT_LOG" &&
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rm -f "$GIT_DIR/BISECT_NAMES" &&
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rm -f "$GIT_DIR/BISECT_RUN" &&
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# Cleanup head-name if it got left by an old version of git-bisect
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rm -f "$GIT_DIR/head-name" &&
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git update-ref -d --no-deref BISECT_HEAD &&
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# clean up BISECT_START last
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rm -f "$GIT_DIR/BISECT_START"
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}
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bisect_replay () {
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file="$1"
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test "$#" -eq 1 || die "$(gettext "No logfile given")"
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test -r "$file" || die "$(eval_gettext "cannot read \$file for replaying")"
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bisect_reset
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while read git bisect command rev
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do
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test "$git $bisect" = "git bisect" -o "$git" = "git-bisect" || continue
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if test "$git" = "git-bisect"; then
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rev="$command"
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command="$bisect"
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fi
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case "$command" in
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start)
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cmd="bisect_start $rev"
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eval "$cmd" ;;
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good|bad|skip)
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bisect_write "$command" "$rev" ;;
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*)
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die "$(gettext "?? what are you talking about?")" ;;
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esac
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done <"$file"
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bisect_auto_next
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}
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bisect_run () {
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bisect_next_check fail
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while true
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do
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command="$@"
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eval_gettext "running \$command"; echo
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"$@"
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res=$?
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# Check for really bad run error.
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if [ $res -lt 0 -o $res -ge 128 ]; then
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(
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eval_gettext "bisect run failed:
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exit code \$res from '\$command' is < 0 or >= 128" &&
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echo
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) >&2
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exit $res
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fi
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# Find current state depending on run success or failure.
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# A special exit code of 125 means cannot test.
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if [ $res -eq 125 ]; then
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state='skip'
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elif [ $res -gt 0 ]; then
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state='bad'
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else
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state='good'
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fi
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# We have to use a subshell because "bisect_state" can exit.
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( bisect_state $state > "$GIT_DIR/BISECT_RUN" )
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res=$?
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cat "$GIT_DIR/BISECT_RUN"
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if sane_grep "first bad commit could be any of" "$GIT_DIR/BISECT_RUN" \
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> /dev/null; then
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(
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gettext "bisect run cannot continue any more" &&
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echo
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) >&2
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exit $res
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fi
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if [ $res -ne 0 ]; then
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(
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eval_gettext "bisect run failed:
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'bisect_state \$state' exited with error code \$res" &&
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echo
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) >&2
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exit $res
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fi
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if sane_grep "is the first bad commit" "$GIT_DIR/BISECT_RUN" > /dev/null; then
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gettext "bisect run success"; echo
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exit 0;
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fi
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done
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}
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bisect_log () {
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test -s "$GIT_DIR/BISECT_LOG" || die "$(gettext "We are not bisecting.")"
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cat "$GIT_DIR/BISECT_LOG"
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}
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case "$#" in
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0)
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usage ;;
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*)
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cmd="$1"
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shift
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case "$cmd" in
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help)
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git bisect -h ;;
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start)
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bisect_start "$@" ;;
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bad|good)
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bisect_state "$cmd" "$@" ;;
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skip)
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bisect_skip "$@" ;;
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next)
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# Not sure we want "next" at the UI level anymore.
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bisect_next "$@" ;;
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visualize|view)
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bisect_visualize "$@" ;;
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reset)
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bisect_reset "$@" ;;
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replay)
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bisect_replay "$@" ;;
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log)
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bisect_log ;;
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run)
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bisect_run "$@" ;;
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*)
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usage ;;
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esac
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esac
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