git-revert.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Linus Torvalds
   4 # Copyright (c) 2005 Junio C Hamano
   5 #
   6 . git-sh-setup
   7
   8 case "$0" in
   9 *-revert* )
  10         test -t 0 && edit=-e
  11         me=revert ;;
  12 *-cherry-pick* )
  13         edit=
  14         me=cherry-pick ;;
  15 * )
  16         die "What are you talking about?" ;;
  17 esac
  18
  19 usage () {
  20         case "$me" in
  21         cherry-pick)
  22                 die "usage git $me [-n] [-r] <commit-ish>"
  23                 ;;
  24         revert)
  25                 die "usage git $me [-n] <commit-ish>"
  26                 ;;
  27         esac
  28 }
  29
  30 no_commit= replay=
  31 while case "$#" in 0) break ;; esac
  32 do
  33         case "$1" in
  34         -n|--n|--no|--no-|--no-c|--no-co|--no-com|--no-comm|\
  35             --no-commi|--no-commit)
  36                 no_commit=t
  37                 ;;
  38         -e|--e|--ed|--edi|--edit)
  39                 edit=-e
  40                 ;;
  41         -n|--n|--no|--no-|--no-e|--no-ed|--no-edi|--no-edit)
  42                 edit=
  43                 ;;
  44         -r|--r|--re|--rep|--repl|--repla|--replay)
  45                 replay=t
  46                 ;;
  47         -*)
  48                 usage
  49                 ;;
  50         *)
  51                 break
  52                 ;;
  53         esac
  54         shift
  55 done
  56
  57 test "$me,$replay" = "revert,t" && usage
  58
  59 case "$no_commit" in
  60 t)
  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: $files)"
  72         fi
  73         ;;
  74 esac
  75
  76 rev=$(git-rev-parse --verify "$@") &&
  77 commit=$(git-rev-parse --verify "$rev^0") ||
  78         die "Not a single commit $@"
  79 prev=$(git-rev-parse --verify "$commit^1" 2>/dev/null) ||
  80         die "Cannot run $me a root commit"
  81 git-rev-parse --verify "$commit^2" >/dev/null 2>&1 &&
  82         die "Cannot run $me a multi-parent commit."
  83
  84 # "commit" is an existing commit.  We would want to apply
  85 # the difference it introduces since its first parent "prev"
  86 # on top of the current HEAD if we are cherry-pick.  Or the
  87 # reverse of it if we are revert.
  88
  89 case "$me" in
  90 revert)
  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
 102 cherry-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
 140 esac >.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
 147 echo >&2 "First trying simple merge strategy to $me."
 148 git-read-tree -m -u $base $head $next &&
 149 result=$(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 }
 164 echo >&2 "Finished one $me."
 165
 166 # If we are cherry-pick, and if the merge did not result in
 167 # hand-editing, we will hit this commit and inherit the original
 168 # author date and name.
 169 # If we are revert, or if our cherry-pick results in a hand merge,
 170 # we had better say that the current user is responsible for that.
 171
 172 case "$no_commit" in
 173 '')
 174         git-commit -n -F .msg $edit
 175         rm -f .msg
 176         ;;
 177 esac