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-rwxr-xr-xgit-bisect.sh382
1 files changed, 382 insertions, 0 deletions
diff --git a/git-bisect.sh b/git-bisect.sh
new file mode 100755
index 0000000..1cd4561
--- /dev/null
+++ b/git-bisect.sh
@@ -0,0 +1,382 @@
+#!/bin/sh
+
+USAGE='[start|bad|good|next|reset|visualize|replay|log|run]'
+LONG_USAGE='git bisect start [<bad> [<good>...]] [--] [<pathspec>...]
+ reset bisect state and start bisection.
+git bisect bad [<rev>]
+ mark <rev> a known-bad revision.
+git bisect good [<rev>...]
+ mark <rev>... known-good revisions.
+git bisect next
+ find next bisection to test and check it out.
+git bisect reset [<branch>]
+ finish bisection search and go back to branch.
+git bisect visualize
+ show bisect status in gitk.
+git bisect replay <logfile>
+ replay bisection log.
+git bisect log
+ show bisect log.
+git bisect run <cmd>...
+ use <cmd>... to automatically bisect.'
+
+. git-sh-setup
+require_work_tree
+
+sq() {
+ @@PERL@@ -e '
+ for (@ARGV) {
+ s/'\''/'\'\\\\\'\''/g;
+ print " '\''$_'\''";
+ }
+ print "\n";
+ ' "$@"
+}
+
+bisect_autostart() {
+ test -d "$GIT_DIR/refs/bisect" || {
+ echo >&2 'You need to start by "git bisect start"'
+ if test -t 0
+ then
+ echo >&2 -n 'Do you want me to do it for you [Y/n]? '
+ read yesno
+ case "$yesno" in
+ [Nn]*)
+ exit ;;
+ esac
+ bisect_start
+ else
+ exit 1
+ fi
+ }
+}
+
+bisect_start() {
+ #
+ # Verify HEAD. If we were bisecting before this, reset to the
+ # top-of-line master first!
+ #
+ head=$(GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD) ||
+ die "Bad HEAD - I need a symbolic ref"
+ case "$head" in
+ refs/heads/bisect)
+ if [ -s "$GIT_DIR/head-name" ]; then
+ branch=`cat "$GIT_DIR/head-name"`
+ else
+ branch=master
+ fi
+ git checkout $branch || exit
+ ;;
+ refs/heads/*)
+ [ -s "$GIT_DIR/head-name" ] && die "won't bisect on seeked tree"
+ echo "$head" | sed 's#^refs/heads/##' >"$GIT_DIR/head-name"
+ ;;
+ *)
+ die "Bad HEAD - strange symbolic ref"
+ ;;
+ esac
+
+ #
+ # Get rid of any old bisect state
+ #
+ bisect_clean_state
+ mkdir "$GIT_DIR/refs/bisect"
+
+ #
+ # Check for one bad and then some good revisions.
+ #
+ has_double_dash=0
+ for arg; do
+ case "$arg" in --) has_double_dash=1; break ;; esac
+ done
+ orig_args=$(sq "$@")
+ bad_seen=0
+ while [ $# -gt 0 ]; do
+ arg="$1"
+ case "$arg" in
+ --)
+ shift
+ break
+ ;;
+ *)
+ rev=$(git-rev-parse --verify "$arg^{commit}" 2>/dev/null) || {
+ test $has_double_dash -eq 1 &&
+ die "'$arg' does not appear to be a valid revision"
+ break
+ }
+ if [ $bad_seen -eq 0 ]; then
+ bad_seen=1
+ bisect_write_bad "$rev"
+ else
+ bisect_write_good "$rev"
+ fi
+ shift
+ ;;
+ esac
+ done
+
+ sq "$@" >"$GIT_DIR/BISECT_NAMES"
+ echo "git-bisect start$orig_args" >>"$GIT_DIR/BISECT_LOG"
+ bisect_auto_next
+}
+
+bisect_bad() {
+ bisect_autostart
+ case "$#" in
+ 0)
+ rev=$(git-rev-parse --verify HEAD) ;;
+ 1)
+ rev=$(git-rev-parse --verify "$1^{commit}") ;;
+ *)
+ usage ;;
+ esac || exit
+ bisect_write_bad "$rev"
+ echo "git-bisect bad $rev" >>"$GIT_DIR/BISECT_LOG"
+ bisect_auto_next
+}
+
+bisect_write_bad() {
+ rev="$1"
+ echo "$rev" >"$GIT_DIR/refs/bisect/bad"
+ echo "# bad: "$(git-show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
+}
+
+bisect_good() {
+ bisect_autostart
+ case "$#" in
+ 0) revs=$(git-rev-parse --verify HEAD) || exit ;;
+ *) revs=$(git-rev-parse --revs-only --no-flags "$@") &&
+ test '' != "$revs" || die "Bad rev input: $@" ;;
+ esac
+ for rev in $revs
+ do
+ rev=$(git-rev-parse --verify "$rev^{commit}") || exit
+ bisect_write_good "$rev"
+ echo "git-bisect good $rev" >>"$GIT_DIR/BISECT_LOG"
+
+ done
+ bisect_auto_next
+}
+
+bisect_write_good() {
+ rev="$1"
+ echo "$rev" >"$GIT_DIR/refs/bisect/good-$rev"
+ echo "# good: "$(git-show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
+}
+
+bisect_next_check() {
+ missing_good= missing_bad=
+ git show-ref -q --verify refs/bisect/bad || missing_bad=t
+ test -n "$(git for-each-ref "refs/bisect/good-*")" || missing_good=t
+
+ case "$missing_good,$missing_bad,$1" in
+ ,,*)
+ : have both good and bad - ok
+ ;;
+ *,)
+ # do not have both but not asked to fail - just report.
+ false
+ ;;
+ t,,good)
+ # have bad but not good. we could bisect although
+ # this is less optimum.
+ echo >&2 'Warning: bisecting only with a bad commit.'
+ if test -t 0
+ then
+ printf >&2 'Are you sure [Y/n]? '
+ case "$(read yesno)" in [Nn]*) exit 1 ;; esac
+ fi
+ : bisect without good...
+ ;;
+ *)
+ THEN=''
+ test -d "$GIT_DIR/refs/bisect" || {
+ echo >&2 'You need to start by "git bisect start".'
+ THEN='then '
+ }
+ echo >&2 'You '$THEN'need to give me at least one good' \
+ 'and one bad revisions.'
+ echo >&2 '(You can use "git bisect bad" and' \
+ '"git bisect good" for that.)'
+ exit 1 ;;
+ esac
+}
+
+bisect_auto_next() {
+ bisect_next_check && bisect_next || :
+}
+
+bisect_next() {
+ case "$#" in 0) ;; *) usage ;; esac
+ bisect_autostart
+ bisect_next_check good
+
+ bad=$(git-rev-parse --verify refs/bisect/bad) &&
+ good=$(git for-each-ref --format='^%(objectname)' \
+ "refs/bisect/good-*" | tr '[\012]' ' ') &&
+ eval="git-rev-list --bisect-vars $good $bad --" &&
+ eval="$eval $(cat "$GIT_DIR/BISECT_NAMES")" &&
+ eval=$(eval "$eval") &&
+ eval "$eval" || exit
+
+ if [ -z "$bisect_rev" ]; then
+ echo "$bad was both good and bad"
+ exit 1
+ fi
+ if [ "$bisect_rev" = "$bad" ]; then
+ echo "$bisect_rev is first bad commit"
+ git-diff-tree --pretty $bisect_rev
+ exit 0
+ fi
+
+ echo "Bisecting: $bisect_nr revisions left to test after this"
+ echo "$bisect_rev" >"$GIT_DIR/refs/heads/new-bisect"
+ git checkout -q new-bisect || exit
+ mv "$GIT_DIR/refs/heads/new-bisect" "$GIT_DIR/refs/heads/bisect" &&
+ GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD refs/heads/bisect
+ git-show-branch "$bisect_rev"
+}
+
+bisect_visualize() {
+ bisect_next_check fail
+ not=`cd "$GIT_DIR/refs" && echo bisect/good-*`
+ eval gitk bisect/bad --not $not -- $(cat "$GIT_DIR/BISECT_NAMES")
+}
+
+bisect_reset() {
+ case "$#" in
+ 0) if [ -s "$GIT_DIR/head-name" ]; then
+ branch=`cat "$GIT_DIR/head-name"`
+ else
+ branch=master
+ fi ;;
+ 1) git-show-ref --verify --quiet -- "refs/heads/$1" || {
+ echo >&2 "$1 does not seem to be a valid branch"
+ exit 1
+ }
+ branch="$1" ;;
+ *)
+ usage ;;
+ esac
+ if git checkout "$branch"; then
+ rm -f "$GIT_DIR/head-name"
+ bisect_clean_state
+ fi
+}
+
+bisect_clean_state() {
+ rm -fr "$GIT_DIR/refs/bisect"
+ rm -f "$GIT_DIR/refs/heads/bisect"
+ rm -f "$GIT_DIR/BISECT_LOG"
+ rm -f "$GIT_DIR/BISECT_NAMES"
+ rm -f "$GIT_DIR/BISECT_RUN"
+}
+
+bisect_replay () {
+ test -r "$1" || {
+ echo >&2 "cannot read $1 for replaying"
+ exit 1
+ }
+ bisect_reset
+ while read bisect command rev
+ do
+ test "$bisect" = "git-bisect" || continue
+ case "$command" in
+ start)
+ cmd="bisect_start $rev"
+ eval "$cmd"
+ ;;
+ good)
+ echo "$rev" >"$GIT_DIR/refs/bisect/good-$rev"
+ echo "# good: "$(git-show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
+ echo "git-bisect good $rev" >>"$GIT_DIR/BISECT_LOG"
+ ;;
+ bad)
+ echo "$rev" >"$GIT_DIR/refs/bisect/bad"
+ echo "# bad: "$(git-show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
+ echo "git-bisect bad $rev" >>"$GIT_DIR/BISECT_LOG"
+ ;;
+ *)
+ echo >&2 "?? what are you talking about?"
+ exit 1 ;;
+ esac
+ done <"$1"
+ bisect_auto_next
+}
+
+bisect_run () {
+ bisect_next_check fail
+
+ while true
+ do
+ echo "running $@"
+ "$@"
+ res=$?
+
+ # Check for really bad run error.
+ if [ $res -lt 0 -o $res -ge 128 ]; then
+ echo >&2 "bisect run failed:"
+ echo >&2 "exit code $res from '$@' is < 0 or >= 128"
+ exit $res
+ fi
+
+ # Use "bisect_good" or "bisect_bad"
+ # depending on run success or failure.
+ if [ $res -gt 0 ]; then
+ next_bisect='bisect_bad'
+ else
+ next_bisect='bisect_good'
+ fi
+
+ # We have to use a subshell because bisect_good or
+ # bisect_bad functions can exit.
+ ( $next_bisect > "$GIT_DIR/BISECT_RUN" )
+ res=$?
+
+ cat "$GIT_DIR/BISECT_RUN"
+
+ if [ $res -ne 0 ]; then
+ echo >&2 "bisect run failed:"
+ echo >&2 "$next_bisect exited with error code $res"
+ exit $res
+ fi
+
+ if grep "is first bad commit" "$GIT_DIR/BISECT_RUN" > /dev/null; then
+ echo "bisect run success"
+ exit 0;
+ fi
+
+ done
+}
+
+
+case "$#" in
+0)
+ usage ;;
+*)
+ cmd="$1"
+ shift
+ case "$cmd" in
+ start)
+ bisect_start "$@" ;;
+ bad)
+ bisect_bad "$@" ;;
+ good)
+ bisect_good "$@" ;;
+ next)
+ # Not sure we want "next" at the UI level anymore.
+ bisect_next "$@" ;;
+ visualize)
+ bisect_visualize "$@" ;;
+ reset)
+ bisect_reset "$@" ;;
+ replay)
+ bisect_replay "$@" ;;
+ log)
+ cat "$GIT_DIR/BISECT_LOG" ;;
+ run)
+ bisect_run "$@" ;;
+ *)
+ usage ;;
+ esac
+esac
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