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