Bisect: implement "git bisect run <cmd>..." to automatically bisect.

diff --git a/git-bisect.sh b/git-bisect.sh
index dbce0dfec93e41f6c1246ce7648ca1c40aeef5b0..3043f65514d8789b7b8f7f72df5968762facb410 100755 (executable)
--- a/git-bisect.sh
+++ b/git-bisect.sh
@@ -1,14 +1,15 @@
 #!/bin/sh
 
-USAGE='[start|bad|good|next|reset|visualize|replay|log]'
+USAGE='[start|bad|good|next|reset|visualize|replay|log|run]'
 LONG_USAGE='git bisect start [<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 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
@@ -185,6 +186,7 @@ bisect_reset() {
                rm -f "$GIT_DIR/refs/heads/bisect" "$GIT_DIR/head-name"
                rm -f "$GIT_DIR/BISECT_LOG"
                rm -f "$GIT_DIR/BISECT_NAMES"
+               rm -f "$GIT_DIR/BISECT_RUN"
        fi
 }
 
@@ -220,6 +222,50 @@ bisect_replay () {
        bisect_auto_next
 }
 
+bisect_run () {
+    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 "$#" in
 0)
     usage ;;
@@ -244,6 +290,8 @@ case "$#" in
        bisect_replay "$@" ;;
     log)
        cat "$GIT_DIR/BISECT_LOG" ;;
+    run)
+        bisect_run "$@" ;;
     *)
         usage ;;
     esac