git-bisect-script

   1 #!/bin/sh
   2 . git-sh-setup-script || dir "Not a git archive"
   3
   4 usage() {
   5     echo >&2 'usage: git bisect [start | bad | good | next | reset]
   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     exit 1
  12 }
  13
  14 bisect_autostart() {
  15         test -d "$GIT_DIR/refs/bisect" || {
  16                 echo >&2 'You need to start by "git bisect start"'
  17                 if test -t 0
  18                 then
  19                         echo >&2 -n 'Do you want me to do it for you [Y/n]? '
  20                         read yesno
  21                         case "$yesno" in
  22                         [Nn]*)
  23                                 exit ;;
  24                         esac
  25                         bisect_start
  26                 else
  27                         exit 1
  28                 fi
  29         }
  30 }
  31
  32 bisect_start() {
  33         case "$#" in 0) ;; *) usage ;; esac
  34         #
  35         # Verify HEAD. If we were bisecting before this, reset to the
  36         # top-of-line master first!
  37         #
  38         head=$(readlink $GIT_DIR/HEAD) || die "Bad HEAD - I need a symlink"
  39         case "$head" in
  40         refs/heads/bisect*)
  41                 git checkout master || exit
  42                 ;;
  43         refs/heads/*)
  44                 ;;
  45         *)
  46                 die "Bad HEAD - strange symlink"
  47                 ;;
  48         esac
  49
  50         #
  51         # Get rid of any old bisect state
  52         #
  53         rm -f "$GIT_DIR/refs/heads/bisect"
  54         rm -rf "$GIT_DIR/refs/bisect/"
  55         mkdir "$GIT_DIR/refs/bisect"
  56 }
  57
  58 bisect_bad() {
  59         bisect_autostart
  60         case "$#" in 0 | 1) ;; *) usage ;; esac
  61         rev=$(git-rev-parse --revs-only --verify --default HEAD "$@") || exit
  62         echo "$rev" > "$GIT_DIR/refs/bisect/bad"
  63         bisect_auto_next
  64 }
  65
  66 bisect_good() {
  67         bisect_autostart
  68         case "$#" in
  69         0)    revs=$(git-rev-parse --verify HEAD) || exit ;;
  70         *)    revs=$(git-rev-parse --revs-only "$@") || exit ;;
  71         esac
  72         for rev in $revs
  73         do
  74             echo "$rev" >"$GIT_DIR/refs/bisect/good-$rev"
  75         done
  76         bisect_auto_next
  77 }
  78
  79 bisect_next_check() {
  80         next_ok=no
  81         test -f "$GIT_DIR/refs/bisect/bad" &&
  82         case "$(cd "$GIT_DIR" && echo refs/bisect/good-*)" in
  83         refs/bisect/good-\*) ;;
  84         *) next_ok=yes ;;
  85         esac
  86         case "$next_ok,$1" in
  87         no,) false ;;
  88         no,fail)
  89             echo >&2 'You need to give me at least one good and one bad revisions.'
  90             exit 1 ;;
  91         *)
  92             true ;;
  93         esac
  94 }
  95
  96 bisect_auto_next() {
  97         bisect_next_check && bisect_next
  98 }
  99
 100 bisect_next() {
 101         case "$#" in 0) ;; *) usage ;; esac
 102         bisect_autostart
 103         bisect_next_check fail
 104         bad=$(git-rev-parse --verify refs/bisect/bad) &&
 105         good=$(git-rev-parse --sq --revs-only --not \
 106                 $(cd "$GIT_DIR" && ls refs/bisect/good-*)) &&
 107         rev=$(eval "git-rev-list --bisect $good $bad") || exit
 108         nr=$(eval "git-rev-list $rev $good" | wc -l) || exit
 109         if [ "$nr" -le "1" ]; then
 110             echo "$bad is first bad commit"
 111             git-diff-tree --pretty $bad
 112             exit 0
 113         fi
 114         echo "Bisecting: $nr revisions left to test after this"
 115         echo "$rev" > "$GIT_DIR/refs/heads/new-bisect"
 116         git checkout new-bisect || exit
 117         mv "$GIT_DIR/refs/heads/new-bisect" "$GIT_DIR/refs/heads/bisect" &&
 118         ln -sf refs/heads/bisect "$GIT_DIR/HEAD"
 119 }
 120
 121 bisect_reset() {
 122         case "$#" in
 123         0) branch=master ;;
 124         1) test -f "$GIT_DIR/refs/heads/$1" || {
 125                echo >&2 "$1 does not seem to be a valid branch"
 126                exit 1
 127            }
 128            branch="$1" ;;
 129         *)
 130             usage ;;
 131         esac
 132         git checkout "$branch" &&
 133         rm -fr "$GIT_DIR/refs/bisect"
 134         rm -f "$GIT_DIR/refs/reads/bisect"
 135 }
 136
 137 case "$#" in
 138 0)
 139     usage ;;
 140 *)
 141     cmd="$1"
 142     shift
 143     case "$cmd" in
 144     start)
 145         bisect_start "$@" ;;
 146     bad)
 147         bisect_bad "$@" ;;
 148     good)
 149         bisect_good "$@" ;;
 150     next)
 151         # Not sure we want "next" at the UI level anymore.
 152         bisect_next "$@" ;;
 153     reset)
 154         bisect_reset "$@" ;;
 155     *)
 156         usage ;;
 157     esac
 158 esac