summaryrefslogtreecommitdiff
path: root/git-bisect.sh
diff options
context:
space:
mode:
Diffstat (limited to 'git-bisect.sh')
-rwxr-xr-xgit-bisect.sh178
1 files changed, 178 insertions, 0 deletions
diff --git a/git-bisect.sh b/git-bisect.sh
new file mode 100755
index 0000000..605d58a
--- /dev/null
+++ b/git-bisect.sh
@@ -0,0 +1,178 @@
+#!/bin/sh
+. git-sh-setup || dir "Not a git archive"
+
+usage() {
+ echo >&2 'usage: git bisect [start|bad|good|next|reset|visualize]
+git bisect start 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.'
+ exit 1
+}
+
+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() {
+ case "$#" in 0) ;; *) usage ;; esac
+ #
+ # Verify HEAD. If we were bisecting before this, reset to the
+ # top-of-line master first!
+ #
+ head=$(readlink $GIT_DIR/HEAD) || die "Bad HEAD - I need a symlink"
+ case "$head" in
+ refs/heads/bisect*)
+ git checkout master || exit
+ ;;
+ refs/heads/*)
+ ;;
+ *)
+ die "Bad HEAD - strange symlink"
+ ;;
+ esac
+
+ #
+ # Get rid of any old bisect state
+ #
+ rm -f "$GIT_DIR/refs/heads/bisect"
+ rm -rf "$GIT_DIR/refs/bisect/"
+ mkdir "$GIT_DIR/refs/bisect"
+}
+
+bisect_bad() {
+ bisect_autostart
+ case "$#" in
+ 0)
+ rev=$(git-rev-parse --verify HEAD) ;;
+ 1)
+ rev=$(git-rev-parse --verify "$1") ;;
+ *)
+ usage ;;
+ esac || exit
+ echo "$rev" > "$GIT_DIR/refs/bisect/bad"
+ bisect_auto_next
+}
+
+bisect_good() {
+ bisect_autostart
+ case "$#" 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 "$rev") || exit
+ echo "$rev" >"$GIT_DIR/refs/bisect/good-$rev"
+ done
+ bisect_auto_next
+}
+
+bisect_next_check() {
+ next_ok=no
+ test -f "$GIT_DIR/refs/bisect/bad" &&
+ case "$(cd "$GIT_DIR" && echo refs/bisect/good-*)" in
+ refs/bisect/good-\*) ;;
+ *) next_ok=yes ;;
+ esac
+ case "$next_ok,$1" in
+ no,) false ;;
+ no,fail)
+ echo >&2 'You need to give me at least one good and one bad revisions.'
+ exit 1 ;;
+ *)
+ true ;;
+ esac
+}
+
+bisect_auto_next() {
+ bisect_next_check && bisect_next
+}
+
+bisect_next() {
+ case "$#" in 0) ;; *) usage ;; esac
+ bisect_autostart
+ bisect_next_check fail
+ bad=$(git-rev-parse --verify refs/bisect/bad) &&
+ good=$(git-rev-parse --sq --revs-only --not \
+ $(cd "$GIT_DIR" && ls refs/bisect/good-*)) &&
+ rev=$(eval "git-rev-list --bisect $good $bad") || exit
+ if [ -z "$rev" ]; then
+ echo "$bad was both good and bad"
+ exit 1
+ fi
+ if [ "$rev" = "$bad" ]; then
+ echo "$rev is first bad commit"
+ git-diff-tree --pretty $rev
+ exit 0
+ fi
+ nr=$(eval "git-rev-list $rev $good" | wc -l) || exit
+ echo "Bisecting: $nr revisions left to test after this"
+ echo "$rev" > "$GIT_DIR/refs/heads/new-bisect"
+ git checkout new-bisect || exit
+ mv "$GIT_DIR/refs/heads/new-bisect" "$GIT_DIR/refs/heads/bisect" &&
+ ln -sf refs/heads/bisect "$GIT_DIR/HEAD"
+}
+
+bisect_visualize() {
+ bisect_next_check fail
+ gitk bisect/bad --not `cd "$GIT_DIR/refs" && echo bisect/good-*`
+}
+
+bisect_reset() {
+ case "$#" in
+ 0) branch=master ;;
+ 1) test -f "$GIT_DIR/refs/heads/$1" || {
+ echo >&2 "$1 does not seem to be a valid branch"
+ exit 1
+ }
+ branch="$1" ;;
+ *)
+ usage ;;
+ esac
+ git checkout "$branch" &&
+ rm -fr "$GIT_DIR/refs/bisect"
+ rm -f "$GIT_DIR/refs/reads/bisect"
+}
+
+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 "$@" ;;
+ reset)
+ bisect_reset "$@" ;;
+ *)
+ usage ;;
+ esac
+esac