git-bisect.sh

   1 #!/bin/sh
   2
   3 USAGE='[start|bad|good|next|reset|visualize]'
   4 LONG_USAGE='git bisect start [<pathspec>]       reset bisect state and start bisection.
   5 git bisect bad [<rev>]          mark <rev> a known-bad revision.
   6 git bisect good [<rev>...]      mark <rev>... known-good revisions.
   7 git bisect next                 find next bisection to test and check it out.
   8 git bisect reset [<branch>]     finish bisection search and go back to branch.
   9 git bisect visualize            show bisect status in gitk.
  10 git bisect replay <logfile>     replay bisection log
  11 git bisect log                  show bisect log.'
  12
  13 . git-sh-setup
  14
  15 sq() {
  16         perl -e '
  17                 for (@ARGV) {
  18                         s/'\''/'\'\\\\\'\''/g;
  19                         print " '\''$_'\''";
  20                 }
  21                 print "\n";
  22         ' "$@"
  23 }
  24
  25 bisect_autostart() {
  26         test -d "$GIT_DIR/refs/bisect" || {
  27                 echo >&2 'You need to start by "git bisect start"'
  28                 if test -t 0
  29                 then
  30                         echo >&2 -n 'Do you want me to do it for you [Y/n]? '
  31                         read yesno
  32                         case "$yesno" in
  33                         [Nn]*)
  34                                 exit ;;
  35                         esac
  36                         bisect_start
  37                 else
  38                         exit 1
  39                 fi
  40         }
  41 }
  42
  43 bisect_start() {
  44         #
  45         # Verify HEAD. If we were bisecting before this, reset to the
  46         # top-of-line master first!
  47         #
  48         head=$(GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD) ||
  49         die "Bad HEAD - I need a symbolic ref"
  50         case "$head" in
  51         refs/heads/bisect*)
  52                 git checkout master || exit
  53                 ;;
  54         refs/heads/*)
  55                 ;;
  56         *)
  57                 die "Bad HEAD - strange symbolic ref"
  58                 ;;
  59         esac
  60
  61         #
  62         # Get rid of any old bisect state
  63         #
  64         rm -f "$GIT_DIR/refs/heads/bisect"
  65         rm -rf "$GIT_DIR/refs/bisect/"
  66         mkdir "$GIT_DIR/refs/bisect"
  67         {
  68             printf "git-bisect start"
  69             sq "$@"
  70         } >"$GIT_DIR/BISECT_LOG"
  71         sq "$@" >"$GIT_DIR/BISECT_NAMES"
  72 }
  73
  74 bisect_bad() {
  75         bisect_autostart
  76         case "$#" in
  77         0)
  78                 rev=$(git-rev-parse --verify HEAD) ;;
  79         1)
  80                 rev=$(git-rev-parse --verify "$1") ;;
  81         *)
  82                 usage ;;
  83         esac || exit
  84         echo "$rev" >"$GIT_DIR/refs/bisect/bad"
  85         echo "# bad: "$(git-show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
  86         echo "git-bisect bad $rev" >>"$GIT_DIR/BISECT_LOG"
  87         bisect_auto_next
  88 }
  89
  90 bisect_good() {
  91         bisect_autostart
  92         case "$#" in
  93         0)    revs=$(git-rev-parse --verify HEAD) || exit ;;
  94         *)    revs=$(git-rev-parse --revs-only --no-flags "$@") &&
  95                 test '' != "$revs" || die "Bad rev input: $@" ;;
  96         esac
  97         for rev in $revs
  98         do
  99                 rev=$(git-rev-parse --verify "$rev") || exit
 100                 echo "$rev" >"$GIT_DIR/refs/bisect/good-$rev"
 101                 echo "# good: "$(git-show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
 102                 echo "git-bisect good $rev" >>"$GIT_DIR/BISECT_LOG"
 103         done
 104         bisect_auto_next
 105 }
 106
 107 bisect_next_check() {
 108         next_ok=no
 109         test -f "$GIT_DIR/refs/bisect/bad" &&
 110         case "$(cd "$GIT_DIR" && echo refs/bisect/good-*)" in
 111         refs/bisect/good-\*) ;;
 112         *) next_ok=yes ;;
 113         esac
 114         case "$next_ok,$1" in
 115         no,) false ;;
 116         no,fail)
 117             echo >&2 'You need to give me at least one good and one bad revisions.'
 118             exit 1 ;;
 119         *)
 120             true ;;
 121         esac
 122 }
 123
 124 bisect_auto_next() {
 125         bisect_next_check && bisect_next || :
 126 }
 127
 128 bisect_next() {
 129         case "$#" in 0) ;; *) usage ;; esac
 130         bisect_autostart
 131         bisect_next_check fail
 132         bad=$(git-rev-parse --verify refs/bisect/bad) &&
 133         good=$(git-rev-parse --sq --revs-only --not \
 134                 $(cd "$GIT_DIR" && ls refs/bisect/good-*)) &&
 135         rev=$(eval "git-rev-list --bisect $good $bad -- $(cat $GIT_DIR/BISECT_NAMES)") || exit
 136         if [ -z "$rev" ]; then
 137             echo "$bad was both good and bad"
 138             exit 1
 139         fi
 140         if [ "$rev" = "$bad" ]; then
 141             echo "$rev is first bad commit"
 142             git-diff-tree --pretty $rev
 143             exit 0
 144         fi
 145         nr=$(eval "git-rev-list $rev $good -- $(cat $GIT_DIR/BISECT_NAMES)" | wc -l) || exit
 146         echo "Bisecting: $nr revisions left to test after this"
 147         echo "$rev" > "$GIT_DIR/refs/heads/new-bisect"
 148         git checkout new-bisect || exit
 149         mv "$GIT_DIR/refs/heads/new-bisect" "$GIT_DIR/refs/heads/bisect" &&
 150         GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD refs/heads/bisect
 151         git-show-branch "$rev"
 152 }
 153
 154 bisect_visualize() {
 155         bisect_next_check fail
 156         not=`cd "$GIT_DIR/refs" && echo bisect/good-*`
 157         eval gitk bisect/bad --not $not -- $(cat "$GIT_DIR/BISECT_NAMES")
 158 }
 159
 160 bisect_reset() {
 161         case "$#" in
 162         0) branch=master ;;
 163         1) test -f "$GIT_DIR/refs/heads/$1" || {
 164                echo >&2 "$1 does not seem to be a valid branch"
 165                exit 1
 166            }
 167            branch="$1" ;;
 168         *)
 169             usage ;;
 170         esac
 171         git checkout "$branch" &&
 172         rm -fr "$GIT_DIR/refs/bisect"
 173         rm -f "$GIT_DIR/refs/heads/bisect"
 174         rm -f "$GIT_DIR/BISECT_LOG"
 175 }
 176
 177 bisect_replay () {
 178         test -r "$1" || {
 179                 echo >&2 "cannot read $1 for replaying"
 180                 exit 1
 181         }
 182         bisect_reset
 183         while read bisect command rev
 184         do
 185                 test "$bisect" = "git-bisect" || continue
 186                 case "$command" in
 187                 start)
 188                         cmd="bisect_start $rev"
 189                         eval "$cmd"
 190                         ;;
 191                 good)
 192                         echo "$rev" >"$GIT_DIR/refs/bisect/good-$rev"
 193                         echo "# good: "$(git-show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
 194                         echo "git-bisect good $rev" >>"$GIT_DIR/BISECT_LOG"
 195                         ;;
 196                 bad)
 197                         echo "$rev" >"$GIT_DIR/refs/bisect/bad"
 198                         echo "# bad: "$(git-show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
 199                         echo "git-bisect bad $rev" >>"$GIT_DIR/BISECT_LOG"
 200                         ;;
 201                 *)
 202                         echo >&2 "?? what are you talking about?"
 203                         exit 1 ;;
 204                 esac
 205         done <"$1"
 206         bisect_auto_next
 207 }
 208
 209 case "$#" in
 210 0)
 211     usage ;;
 212 *)
 213     cmd="$1"
 214     shift
 215     case "$cmd" in
 216     start)
 217         bisect_start "$@" ;;
 218     bad)
 219         bisect_bad "$@" ;;
 220     good)
 221         bisect_good "$@" ;;
 222     next)
 223         # Not sure we want "next" at the UI level anymore.
 224         bisect_next "$@" ;;
 225     visualize)
 226         bisect_visualize "$@" ;;
 227     reset)
 228         bisect_reset "$@" ;;
 229     replay)
 230         bisect_replay "$@" ;;
 231     log)
 232         cat "$GIT_DIR/BISECT_LOG" ;;
 233     *)
 234         usage ;;
 235     esac
 236 esac