git-bisect.sh

   1 #!/bin/sh
   2 . git-sh-setup
   3
   4 usage() {
   5     echo >&2 'usage: git bisect [start|bad|good|next|reset|visualize]
   6 git bisect start                reset bisect state and start bisection.
   7 git bisect bad [<rev>]          mark <rev> a known-bad revision.
   8 git bisect good [<rev>...]      mark <rev>... known-good revisions.
   9 git bisect next                 find next bisection to test and check it out.
  10 git bisect reset [<branch>]     finish bisection search and go back to branch.
  11 git bisect visualize            show bisect status in gitk.
  12 git bisect replay <logfile>     replay bisection log
  13 git bisect log                  show bisect log.'
  14     exit 1
  15 }
  16
  17 bisect_autostart() {
  18         test -d "$GIT_DIR/refs/bisect" || {
  19                 echo >&2 'You need to start by "git bisect start"'
  20                 if test -t 0
  21                 then
  22                         echo >&2 -n 'Do you want me to do it for you [Y/n]? '
  23                         read yesno
  24                         case "$yesno" in
  25                         [Nn]*)
  26                                 exit ;;
  27                         esac
  28                         bisect_start
  29                 else
  30                         exit 1
  31                 fi
  32         }
  33 }
  34
  35 bisect_start() {
  36         case "$#" in 0) ;; *) usage ;; esac
  37         #
  38         # Verify HEAD. If we were bisecting before this, reset to the
  39         # top-of-line master first!
  40         #
  41         head=$(GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD) ||
  42         die "Bad HEAD - I need a symbolic ref"
  43         case "$head" in
  44         refs/heads/bisect*)
  45                 git checkout master || exit
  46                 ;;
  47         refs/heads/*)
  48                 ;;
  49         *)
  50                 die "Bad HEAD - strange symbolic ref"
  51                 ;;
  52         esac
  53
  54         #
  55         # Get rid of any old bisect state
  56         #
  57         rm -f "$GIT_DIR/refs/heads/bisect"
  58         rm -rf "$GIT_DIR/refs/bisect/"
  59         mkdir "$GIT_DIR/refs/bisect"
  60         echo "git-bisect start" >"$GIT_DIR/BISECT_LOG"
  61 }
  62
  63 bisect_bad() {
  64         bisect_autostart
  65         case "$#" in
  66         0)
  67                 rev=$(git-rev-parse --verify HEAD) ;;
  68         1)
  69                 rev=$(git-rev-parse --verify "$1") ;;
  70         *)
  71                 usage ;;
  72         esac || exit
  73         echo "$rev" >"$GIT_DIR/refs/bisect/bad"
  74         echo "# bad: "$(git-show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
  75         echo "git-bisect bad $rev" >>"$GIT_DIR/BISECT_LOG"
  76         bisect_auto_next
  77 }
  78
  79 bisect_good() {
  80         bisect_autostart
  81         case "$#" in
  82         0)    revs=$(git-rev-parse --verify HEAD) || exit ;;
  83         *)    revs=$(git-rev-parse --revs-only --no-flags "$@") &&
  84                 test '' != "$revs" || die "Bad rev input: $@" ;;
  85         esac
  86         for rev in $revs
  87         do
  88                 rev=$(git-rev-parse --verify "$rev") || exit
  89                 echo "$rev" >"$GIT_DIR/refs/bisect/good-$rev"
  90                 echo "# good: "$(git-show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
  91                 echo "git-bisect good $rev" >>"$GIT_DIR/BISECT_LOG"
  92         done
  93         bisect_auto_next
  94 }
  95
  96 bisect_next_check() {
  97         next_ok=no
  98         test -f "$GIT_DIR/refs/bisect/bad" &&
  99         case "$(cd "$GIT_DIR" && echo refs/bisect/good-*)" in
 100         refs/bisect/good-\*) ;;
 101         *) next_ok=yes ;;
 102         esac
 103         case "$next_ok,$1" in
 104         no,) false ;;
 105         no,fail)
 106             echo >&2 'You need to give me at least one good and one bad revisions.'
 107             exit 1 ;;
 108         *)
 109             true ;;
 110         esac
 111 }
 112
 113 bisect_auto_next() {
 114         bisect_next_check && bisect_next || :
 115 }
 116
 117 bisect_next() {
 118         case "$#" in 0) ;; *) usage ;; esac
 119         bisect_autostart
 120         bisect_next_check fail
 121         bad=$(git-rev-parse --verify refs/bisect/bad) &&
 122         good=$(git-rev-parse --sq --revs-only --not \
 123                 $(cd "$GIT_DIR" && ls refs/bisect/good-*)) &&
 124         rev=$(eval "git-rev-list --bisect $good $bad") || exit
 125         if [ -z "$rev" ]; then
 126             echo "$bad was both good and bad"
 127             exit 1
 128         fi
 129         if [ "$rev" = "$bad" ]; then
 130             echo "$rev is first bad commit"
 131             git-diff-tree --pretty $rev
 132             exit 0
 133         fi
 134         nr=$(eval "git-rev-list $rev $good" | wc -l) || exit
 135         echo "Bisecting: $nr revisions left to test after this"
 136         echo "$rev" > "$GIT_DIR/refs/heads/new-bisect"
 137         git checkout new-bisect || exit
 138         mv "$GIT_DIR/refs/heads/new-bisect" "$GIT_DIR/refs/heads/bisect" &&
 139         GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD refs/heads/bisect
 140         git-show-branch "$rev"
 141 }
 142
 143 bisect_visualize() {
 144         bisect_next_check fail
 145         gitk bisect/bad --not `cd "$GIT_DIR/refs" && echo bisect/good-*`
 146 }
 147
 148 bisect_reset() {
 149         case "$#" in
 150         0) branch=master ;;
 151         1) test -f "$GIT_DIR/refs/heads/$1" || {
 152                echo >&2 "$1 does not seem to be a valid branch"
 153                exit 1
 154            }
 155            branch="$1" ;;
 156         *)
 157             usage ;;
 158         esac
 159         git checkout "$branch" &&
 160         rm -fr "$GIT_DIR/refs/bisect"
 161         rm -f "$GIT_DIR/refs/heads/bisect"
 162         rm -f "$GIT_DIR/BISECT_LOG"
 163 }
 164
 165 bisect_replay () {
 166         test -r "$1" || {
 167                 echo >&2 "cannot read $1 for replaying"
 168                 exit 1
 169         }
 170         bisect_reset
 171         while read bisect command rev
 172         do
 173                 test "$bisect" = "git-bisect" || continue
 174                 case "$command" in
 175                 start)
 176                         bisect_start
 177                         ;;
 178                 good)
 179                         echo "$rev" >"$GIT_DIR/refs/bisect/good-$rev"
 180                         echo "# good: "$(git-show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
 181                         echo "git-bisect good $rev" >>"$GIT_DIR/BISECT_LOG"
 182                         ;;
 183                 bad)
 184                         echo "$rev" >"$GIT_DIR/refs/bisect/bad"
 185                         echo "# bad: "$(git-show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
 186                         echo "git-bisect bad $rev" >>"$GIT_DIR/BISECT_LOG"
 187                         ;;
 188                 *)
 189                         echo >&2 "?? what are you talking about?"
 190                         exit 1 ;;
 191                 esac
 192         done <"$1"
 193         bisect_auto_next
 194 }
 195
 196 case "$#" in
 197 0)
 198     usage ;;
 199 *)
 200     cmd="$1"
 201     shift
 202     case "$cmd" in
 203     start)
 204         bisect_start "$@" ;;
 205     bad)
 206         bisect_bad "$@" ;;
 207     good)
 208         bisect_good "$@" ;;
 209     next)
 210         # Not sure we want "next" at the UI level anymore.
 211         bisect_next "$@" ;;
 212     visualize)
 213         bisect_visualize "$@" ;;
 214     reset)
 215         bisect_reset "$@" ;;
 216     replay)
 217         bisect_replay "$@" ;;
 218     log)
 219         cat "$GIT_DIR/BISECT_LOG" ;;
 220     *)
 221         usage ;;
 222     esac
 223 esac