stash: introduce 'stash save --keep-index' option
[gitweb.git] / git-bisect.sh
index d8d9bfde4cdd4b558992c68cb7cdaaa1b8a1212d..991b2ef37e5121d89f40d1b10964bf5d5beed40b 100755 (executable)
@@ -44,7 +44,7 @@ sq() {
 }
 
 bisect_autostart() {
-       test -f "$GIT_DIR/BISECT_NAMES" || {
+       test -s "$GIT_DIR/BISECT_START" || {
                echo >&2 'You need to start by "git bisect start"'
                if test -t 0
                then
@@ -63,37 +63,42 @@ bisect_autostart() {
 
 bisect_start() {
        #
-       # Verify HEAD. If we were bisecting before this, reset to the
-       # top-of-line master first!
+       # Verify HEAD.
        #
        head=$(GIT_DIR="$GIT_DIR" git symbolic-ref -q HEAD) ||
        head=$(GIT_DIR="$GIT_DIR" git rev-parse --verify HEAD) ||
        die "Bad HEAD - I need a HEAD"
+
+       #
+       # Check if we are bisecting.
+       #
        start_head=''
-       case "$head" in
-       refs/heads/bisect)
-               if [ -s "$GIT_DIR/BISECT_START" ]; then
-                   branch=`cat "$GIT_DIR/BISECT_START"`
-               else
-                   branch=master
-               fi
-               git checkout $branch || exit
-               ;;
-       refs/heads/*|$_x40)
-               # This error message should only be triggered by cogito usage,
-               # and cogito users should understand it relates to cg-seek.
-               [ -s "$GIT_DIR/head-name" ] && die "won't bisect on seeked tree"
-               start_head="${head#refs/heads/}"
-               ;;
-       *)
-               die "Bad HEAD - strange symbolic ref"
-               ;;
-       esac
+       if test -s "$GIT_DIR/BISECT_START"
+       then
+               # Reset to the rev from where we started.
+               start_head=$(cat "$GIT_DIR/BISECT_START")
+               git checkout "$start_head" || exit
+       else
+               # Get rev from where we start.
+               case "$head" in
+               refs/heads/*|$_x40)
+                       # This error message should only be triggered by
+                       # cogito usage, and cogito users should understand
+                       # it relates to cg-seek.
+                       [ -s "$GIT_DIR/head-name" ] &&
+                               die "won't bisect on seeked tree"
+                       start_head="${head#refs/heads/}"
+                       ;;
+               *)
+                       die "Bad HEAD - strange symbolic ref"
+                       ;;
+               esac
+       fi
 
        #
-       # Get rid of any old bisect state
+       # Get rid of any old bisect state.
        #
-       bisect_clean_state
+       bisect_clean_state || exit
 
        #
        # Check for one bad and then some good revisions.
@@ -113,7 +118,7 @@ bisect_start() {
                break
                ;;
            *)
-               rev=$(git rev-parse --verify "$arg^{commit}" 2>/dev/null) || {
+               rev=$(git rev-parse -q --verify "$arg^{commit}") || {
                    test $has_double_dash -eq 1 &&
                        die "'$arg' does not appear to be a valid revision"
                    break
@@ -128,11 +133,29 @@ bisect_start() {
            esac
        done
 
-       sq "$@" >"$GIT_DIR/BISECT_NAMES"
-       test -n "$start_head" && echo "$start_head" >"$GIT_DIR/BISECT_START"
-       eval "$eval"
-       echo "git-bisect start$orig_args" >>"$GIT_DIR/BISECT_LOG"
+       #
+       # Change state.
+       # In case of mistaken revs or checkout error, or signals received,
+       # "bisect_auto_next" below may exit or misbehave.
+       # We have to trap this to be able to clean up using
+       # "bisect_clean_state".
+       #
+       trap 'bisect_clean_state' 0
+       trap 'exit 255' 1 2 3 15
+
+       #
+       # Write new start state.
+       #
+       echo "$start_head" >"$GIT_DIR/BISECT_START" &&
+       sq "$@" >"$GIT_DIR/BISECT_NAMES" &&
+       eval "$eval" &&
+       echo "git-bisect start$orig_args" >>"$GIT_DIR/BISECT_LOG" || exit
+       #
+       # Check if we can proceed to the next bisect state.
+       #
        bisect_auto_next
+
+       trap '-' 0
 }
 
 bisect_write() {
@@ -144,9 +167,9 @@ bisect_write() {
                good|skip)      tag="$state"-"$rev" ;;
                *)              die "Bad bisect_write argument: $state" ;;
        esac
-       git update-ref "refs/bisect/$tag" "$rev"
+       git update-ref "refs/bisect/$tag" "$rev" || exit
        echo "# $state: $(git show-branch $rev)" >>"$GIT_DIR/BISECT_LOG"
-       test -z "$nolog" && echo "git-bisect $state $rev" >>"$GIT_DIR/BISECT_LOG"
+       test -n "$nolog" || echo "git-bisect $state $rev" >>"$GIT_DIR/BISECT_LOG"
 }
 
 bisect_state() {
@@ -203,7 +226,7 @@ bisect_next_check() {
                ;;
        *)
                THEN=''
-               test -f "$GIT_DIR/BISECT_NAMES" || {
+               test -s "$GIT_DIR/BISECT_START" || {
                        echo >&2 'You need to start by "git bisect start".'
                        THEN='then '
                }
@@ -219,18 +242,33 @@ bisect_auto_next() {
        bisect_next_check && bisect_next || :
 }
 
+eval_rev_list() {
+       _eval="$1"
+
+       eval $_eval
+       res=$?
+
+       if [ $res -ne 0 ]; then
+               echo >&2 "'git rev-list --bisect-vars' failed:"
+               echo >&2 "maybe you mistake good and bad revs?"
+               exit $res
+       fi
+
+       return $res
+}
+
 filter_skipped() {
        _eval="$1"
        _skip="$2"
 
        if [ -z "$_skip" ]; then
-               eval $_eval
+               eval_rev_list "$_eval"
                return
        fi
 
        # Let's parse the output of:
        # "git rev-list --bisect-vars --bisect-all ..."
-       eval $_eval | while read hash line
+       eval_rev_list "$_eval" | while read hash line
        do
                case "$VARS,$FOUND,$TRIED,$hash" in
                        # We display some vars.
@@ -328,9 +366,7 @@ bisect_next() {
        exit_if_skipped_commits "$bisect_rev"
 
        echo "Bisecting: $bisect_nr revisions left to test after this"
-       git branch -f new-bisect "$bisect_rev"
-       git checkout -q new-bisect || exit
-       git branch -M new-bisect bisect
+       git checkout -q "$bisect_rev" || exit
        git show-branch "$bisect_rev"
 }
 
@@ -356,40 +392,35 @@ bisect_visualize() {
 }
 
 bisect_reset() {
-       test -f "$GIT_DIR/BISECT_NAMES" || {
+       test -s "$GIT_DIR/BISECT_START" || {
                echo "We are not bisecting."
                return
        }
        case "$#" in
-       0) if [ -s "$GIT_DIR/BISECT_START" ]; then
-              branch=`cat "$GIT_DIR/BISECT_START"`
-          else
-              branch=master
-          fi ;;
+       0) branch=$(cat "$GIT_DIR/BISECT_START") ;;
        1) git show-ref --verify --quiet -- "refs/heads/$1" ||
               die "$1 does not seem to be a valid branch"
           branch="$1" ;;
        *)
            usage ;;
        esac
-       if git checkout "$branch"; then
-               # Cleanup head-name if it got left by an old version of git-bisect
-               rm -f "$GIT_DIR/head-name"
-               rm -f "$GIT_DIR/BISECT_START"
-               bisect_clean_state
-       fi
+       git checkout "$branch" && bisect_clean_state
 }
 
 bisect_clean_state() {
        # There may be some refs packed during bisection.
-       git for-each-ref --format='%(refname) %(objectname)' refs/bisect/\* refs/heads/bisect |
+       git for-each-ref --format='%(refname) %(objectname)' refs/bisect/\* |
        while read ref hash
        do
-               git update-ref -d $ref $hash
+               git update-ref -d $ref $hash || exit
        done
-       rm -f "$GIT_DIR/BISECT_LOG"
-       rm -f "$GIT_DIR/BISECT_NAMES"
-       rm -f "$GIT_DIR/BISECT_RUN"
+       rm -f "$GIT_DIR/BISECT_LOG" &&
+       rm -f "$GIT_DIR/BISECT_NAMES" &&
+       rm -f "$GIT_DIR/BISECT_RUN" &&
+       # Cleanup head-name if it got left by an old version of git-bisect
+       rm -f "$GIT_DIR/head-name" &&
+
+       rm -f "$GIT_DIR/BISECT_START"
 }
 
 bisect_replay () {