contrib/rerere-train.sh

   1 #!/bin/sh
   2 # Copyright (c) 2008, Nanako Shiraishi
   3 # Prime rerere database from existing merge commits
   4
   5 me=rerere-train
   6 USAGE=$(cat <<-EOF
   7 usage: $me [--overwrite] <rev-list-args>
   8
   9     -h, --help            show the help
  10     -o, --overwrite       overwrite any existing rerere cache
  11 EOF
  12 )
  13
  14 SUBDIRECTORY_OK=Yes
  15
  16 overwrite=0
  17
  18 while test $# -gt 0
  19 do
  20         opt="$1"
  21         case "$opt" in
  22         -h|--help)
  23                 echo "$USAGE"
  24                 exit 0
  25                 ;;
  26         -o|--overwrite)
  27                 overwrite=1
  28                 shift
  29                 break
  30                 ;;
  31         --)
  32                 shift
  33                 break
  34                 ;;
  35         *)
  36                 break
  37                 ;;
  38         esac
  39 done
  40
  41 # Overwrite or help options are not valid except as first arg
  42 for opt in "$@"
  43 do
  44         case "$opt" in
  45         -h|--help)
  46                 echo "$USAGE"
  47                 exit 0
  48                 ;;
  49         -o|--overwrite)
  50                 echo "$USAGE"
  51                 exit 0
  52                 ;;
  53         esac
  54 done
  55
  56 . "$(git --exec-path)/git-sh-setup"
  57 require_work_tree
  58 cd_to_toplevel
  59
  60 # Remember original branch
  61 branch=$(git symbolic-ref -q HEAD) ||
  62 original_HEAD=$(git rev-parse --verify HEAD) || {
  63         echo >&2 "Not on any branch and no commit yet?"
  64         exit 1
  65 }
  66
  67 mkdir -p "$GIT_DIR/rr-cache" || exit
  68
  69 git rev-list --parents "$@" |
  70 while read commit parent1 other_parents
  71 do
  72         if test -z "$other_parents"
  73         then
  74                 # Skip non-merges
  75                 continue
  76         fi
  77         git checkout -q "$parent1^0"
  78         if git merge $other_parents >/dev/null 2>&1
  79         then
  80                 # Cleanly merges
  81                 continue
  82         fi
  83         if test $overwrite = 1
  84         then
  85                 git rerere forget .
  86         fi
  87         if test -s "$GIT_DIR/MERGE_RR"
  88         then
  89                 git show -s --pretty=format:"Learning from %h %s" "$commit"
  90                 git rerere
  91                 git checkout -q $commit -- .
  92                 git rerere
  93         fi
  94         git reset -q --hard
  95 done
  96
  97 if test -z "$branch"
  98 then
  99         git checkout "$original_HEAD"
 100 else
 101         git checkout "${branch#refs/heads/}"
 102 fi