Andrew's git - gitweb.git/blob

   1#!/bin/sh
   2#
   3# Copyright (c) 2005 Linus Torvalds
   4# Copyright (c) 2005 Junio C Hamano
   5#
   6. git-sh-setup
   7
   8case "$0" in
   9*-revert* )
  10        test -t 0 && edit=-e
  11        me=revert ;;
  12*-cherry-pick* )
  13        edit=
  14        me=cherry-pick ;;
  15* )
  16        die "What are you talking about?" ;;
  17esac
  18
  19usage () {
  20        case "$me" in
  21        cherry-pick)
  22                die "usage git $me [-n] [-r] <commit-ish>"
  23                ;;
  24        revert)
  25                die "usage git $me [-n] <commit-ish>"
  26                ;;
  27        esac
  28}
  29
  30no_commit= replay=
  31while case "$#" in 0) break ;; esac
  32do
  33        case "$1" in
  34        -n|--n|--no|--no-|--no-c|--no-co|--no-com|--no-comm|\
  35            --no-commi|--no-commit)
  36                no_commit=t
  37                ;;
  38        -e|--e|--ed|--edi|--edit)
  39                edit=-e
  40                ;;
  41        -n|--n|--no|--no-|--no-e|--no-ed|--no-edi|--no-edit)
  42                edit=
  43                ;;
  44        -r|--r|--re|--rep|--repl|--repla|--replay)
  45                replay=t
  46                ;;
  47        -*)
  48                usage
  49                ;;
  50        *)
  51                break
  52                ;;
  53        esac
  54        shift
  55done
  56
  57test "$me,$replay" = "revert,t" && usage
  58
  59case "$no_commit" in
  60t)
  61        # We do not intend to commit immediately.  We just want to
  62        # merge the differences in.
  63        head=$(git-write-tree) ||
  64                die "Your index file is unmerged."
  65        ;;
  66*)
  67        head=$(git-rev-parse --verify HEAD) ||
  68                die "You do not have a valid HEAD"
  69        files=$(git-diff-index --cached --name-only $head) || exit
  70        if [ "$files" ]; then
  71                die "Dirty index: cannot $me (dirty: $files)"
  72        fi
  73        ;;
  74esac
  75
  76rev=$(git-rev-parse --verify "$@") &&
  77commit=$(git-rev-parse --verify "$rev^0") ||
  78        die "Not a single commit $@"
  79prev=$(git-rev-parse --verify "$commit^1" 2>/dev/null) ||
  80        die "Cannot run $me a root commit"
  81git-rev-parse --verify "$commit^2" >/dev/null 2>&1 &&
  82        die "Cannot run $me a multi-parent commit."
  83
  84# "commit" is an existing commit.  We would want to apply
  85# the difference it introduces since its first parent "prev"
  86# on top of the current HEAD if we are cherry-pick.  Or the
  87# reverse of it if we are revert.
  88
  89case "$me" in
  90revert)
  91        git-rev-list --pretty=oneline --max-count=1 $commit |
  92        sed -e '
  93                s/^[^ ]* /Revert "/
  94                s/$/"/'
  95        echo
  96        echo "This reverts $commit commit."
  97        test "$rev" = "$commit" ||
  98        echo "(original 'git revert' arguments: $@)"
  99        base=$commit next=$prev
 100        ;;
 101
 102cherry-pick)
 103        pick_author_script='
 104        /^author /{
 105                h
 106                s/^author \([^<]*\) <[^>]*> .*$/\1/
 107                s/'\''/'\''\'\'\''/g
 108                s/.*/GIT_AUTHOR_NAME='\''&'\''/p
 109
 110                g
 111                s/^author [^<]* <\([^>]*\)> .*$/\1/
 112                s/'\''/'\''\'\'\''/g
 113                s/.*/GIT_AUTHOR_EMAIL='\''&'\''/p
 114
 115                g
 116                s/^author [^<]* <[^>]*> \(.*\)$/\1/
 117                s/'\''/'\''\'\'\''/g
 118                s/.*/GIT_AUTHOR_DATE='\''&'\''/p
 119
 120                q
 121        }'
 122        set_author_env=`git-cat-file commit "$commit" |
 123        LANG=C LC_ALL=C sed -ne "$pick_author_script"`
 124        eval "$set_author_env"
 125        export GIT_AUTHOR_NAME
 126        export GIT_AUTHOR_EMAIL
 127        export GIT_AUTHOR_DATE
 128
 129        git-cat-file commit $commit | sed -e '1,/^$/d'
 130        case "$replay" in
 131        '')
 132                echo "(cherry picked from $commit commit)"
 133                test "$rev" = "$commit" ||
 134                echo "(original 'git cherry-pick' arguments: $@)"
 135                ;;
 136        esac
 137        base=$prev next=$commit
 138        ;;
 139
 140esac >.msg
 141
 142# This three way merge is an interesting one.  We are at
 143# $head, and would want to apply the change between $commit
 144# and $prev on top of us (when reverting), or the change between
 145# $prev and $commit on top of us (when cherry-picking or replaying).
 146
 147echo >&2 "First trying simple merge strategy to $me."
 148git-read-tree -m -u $base $head $next &&
 149result=$(git-write-tree 2>/dev/null) || {
 150    echo >&2 "Simple $me fails; trying Automatic $me."
 151    git-merge-index -o git-merge-one-file -a || {
 152            echo >&2 "Automatic $me failed.  After fixing it up,"
 153            echo >&2 "you can use \"git commit -F .msg\""
 154            case "$me" in
 155            cherry-pick)
 156                echo >&2 "You may choose to use the following when making"
 157                echo >&2 "the commit:"
 158                echo >&2 "$set_author_env"
 159            esac
 160            exit 1
 161    }
 162    result=$(git-write-tree) || exit
 163}
 164echo >&2 "Finished one $me."
 165
 166# If we are cherry-pick, and if the merge did not result in
 167# hand-editing, we will hit this commit and inherit the original
 168# author date and name.
 169# If we are revert, or if our cherry-pick results in a hand merge,
 170# we had better say that the current user is responsible for that.
 171
 172case "$no_commit" in
 173'')
 174        git-commit -n -F .msg $edit
 175        rm -f .msg
 176        ;;
 177esac