git-revert.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Linus Torvalds
   4 # Copyright (c) 2005 Junio C Hamano
   5 #
   6
   7 case "$0" in
   8 *-revert* )
   9         test -t 0 && edit=-e
  10         replay=
  11         me=revert
  12         USAGE='[--edit | --no-edit] [-n] <commit-ish>' ;;
  13 *-cherry-pick* )
  14         replay=t
  15         edit=
  16         me=cherry-pick
  17         USAGE='[--edit] [-n] [-r] [-x] <commit-ish>'  ;;
  18 * )
  19         echo >&2 "What are you talking about?"
  20         exit 1 ;;
  21 esac
  22 . git-sh-setup
  23 require_work_tree
  24
  25 no_commit=
  26 while case "$#" in 0) break ;; esac
  27 do
  28         case "$1" in
  29         -n|--n|--no|--no-|--no-c|--no-co|--no-com|--no-comm|\
  30             --no-commi|--no-commit)
  31                 no_commit=t
  32                 ;;
  33         -e|--e|--ed|--edi|--edit)
  34                 edit=-e
  35                 ;;
  36         --n|--no|--no-|--no-e|--no-ed|--no-edi|--no-edit)
  37                 edit=
  38                 ;;
  39         -r)
  40                 : no-op ;;
  41         -x|--i-really-want-to-expose-my-private-commit-object-name)
  42                 replay=
  43                 ;;
  44         -*)
  45                 usage
  46                 ;;
  47         *)
  48                 break
  49                 ;;
  50         esac
  51         shift
  52 done
  53
  54 test "$me,$replay" = "revert,t" && usage
  55
  56 case "$no_commit" in
  57 t)
  58         # We do not intend to commit immediately.  We just want to
  59         # merge the differences in.
  60         head=$(git-write-tree) ||
  61                 die "Your index file is unmerged."
  62         ;;
  63 *)
  64         head=$(git-rev-parse --verify HEAD) ||
  65                 die "You do not have a valid HEAD"
  66         files=$(git-diff-index --cached --name-only $head) || exit
  67         if [ "$files" ]; then
  68                 die "Dirty index: cannot $me (dirty: $files)"
  69         fi
  70         ;;
  71 esac
  72
  73 rev=$(git-rev-parse --verify "$@") &&
  74 commit=$(git-rev-parse --verify "$rev^0") ||
  75         die "Not a single commit $@"
  76 prev=$(git-rev-parse --verify "$commit^1" 2>/dev/null) ||
  77         die "Cannot run $me a root commit"
  78 git-rev-parse --verify "$commit^2" >/dev/null 2>&1 &&
  79         die "Cannot run $me a multi-parent commit."
  80
  81 encoding=$(git repo-config i18n.commitencoding || echo UTF-8)
  82
  83 # "commit" is an existing commit.  We would want to apply
  84 # the difference it introduces since its first parent "prev"
  85 # on top of the current HEAD if we are cherry-pick.  Or the
  86 # reverse of it if we are revert.
  87
  88 case "$me" in
  89 revert)
  90         git show -s --pretty=oneline --encoding="$encoding" $commit |
  91         sed -e '
  92                 s/^[^ ]* /Revert "/
  93                 s/$/"/
  94         '
  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                 s/'\''/'\''\\'\'\''/g
 106                 h
 107                 s/^author \([^<]*\) <[^>]*> .*$/\1/
 108                 s/'\''/'\''\'\'\''/g
 109                 s/.*/GIT_AUTHOR_NAME='\''&'\''/p
 110
 111                 g
 112                 s/^author [^<]* <\([^>]*\)> .*$/\1/
 113                 s/'\''/'\''\'\'\''/g
 114                 s/.*/GIT_AUTHOR_EMAIL='\''&'\''/p
 115
 116                 g
 117                 s/^author [^<]* <[^>]*> \(.*\)$/\1/
 118                 s/'\''/'\''\'\'\''/g
 119                 s/.*/GIT_AUTHOR_DATE='\''&'\''/p
 120
 121                 q
 122         }'
 123
 124         logmsg=`git show -s --pretty=raw --encoding="$encoding" "$commit"`
 125         set_author_env=`echo "$logmsg" |
 126         LANG=C LC_ALL=C sed -ne "$pick_author_script"`
 127         eval "$set_author_env"
 128         export GIT_AUTHOR_NAME
 129         export GIT_AUTHOR_EMAIL
 130         export GIT_AUTHOR_DATE
 131
 132         echo "$logmsg" |
 133         sed -e '1,/^$/d' -e 's/^    //'
 134         case "$replay" in
 135         '')
 136                 echo "(cherry picked from commit $commit)"
 137                 test "$rev" = "$commit" ||
 138                 echo "(original 'git cherry-pick' arguments: $@)"
 139                 ;;
 140         esac
 141         base=$prev next=$commit
 142         ;;
 143
 144 esac >.msg
 145
 146 # This three way merge is an interesting one.  We are at
 147 # $head, and would want to apply the change between $commit
 148 # and $prev on top of us (when reverting), or the change between
 149 # $prev and $commit on top of us (when cherry-picking or replaying).
 150
 151 echo >&2 "First trying simple merge strategy to $me."
 152 git-read-tree -m -u --aggressive $base $head $next &&
 153 result=$(git-write-tree 2>/dev/null) || {
 154     echo >&2 "Simple $me fails; trying Automatic $me."
 155     git-merge-index -o git-merge-one-file -a || {
 156             mv -f .msg "$GIT_DIR/MERGE_MSG"
 157             {
 158                 echo '
 159 Conflicts:
 160 '
 161                 git ls-files --unmerged |
 162                 sed -e 's/^[^   ]*      /       /' |
 163                 uniq
 164             } >>"$GIT_DIR/MERGE_MSG"
 165             echo >&2 "Automatic $me failed.  After resolving the conflicts,"
 166             echo >&2 "mark the corrected paths with 'git-add <paths>'"
 167             echo >&2 "and commit the result."
 168             case "$me" in
 169             cherry-pick)
 170                 echo >&2 "You may choose to use the following when making"
 171                 echo >&2 "the commit:"
 172                 echo >&2 "$set_author_env"
 173             esac
 174             exit 1
 175     }
 176     result=$(git-write-tree) || exit
 177 }
 178 echo >&2 "Finished one $me."
 179
 180 # If we are cherry-pick, and if the merge did not result in
 181 # hand-editing, we will hit this commit and inherit the original
 182 # author date and name.
 183 # If we are revert, or if our cherry-pick results in a hand merge,
 184 # we had better say that the current user is responsible for that.
 185
 186 case "$no_commit" in
 187 '')
 188         git-commit -n -F .msg $edit
 189         rm -f .msg
 190         ;;
 191 esac