contrib/examples/git-revert.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Linus Torvalds
   4 # Copyright (c) 2005 Junio C Hamano
   5 #
   6
   7 case "$0" in
   8 *-revert* )
   9         test -t 0 && edit=-e
  10         replay=
  11         me=revert
  12         USAGE='[--edit | --no-edit] [-n] <commit-ish>' ;;
  13 *-cherry-pick* )
  14         replay=t
  15         edit=
  16         me=cherry-pick
  17         USAGE='[--edit] [-n] [-r] [-x] <commit-ish>'  ;;
  18 * )
  19         echo >&2 "What are you talking about?"
  20         exit 1 ;;
  21 esac
  22
  23 SUBDIRECTORY_OK=Yes ;# we will cd up
  24 . git-sh-setup
  25 require_work_tree
  26 cd_to_toplevel
  27
  28 no_commit=
  29 while case "$#" in 0) break ;; esac
  30 do
  31         case "$1" in
  32         -n|--n|--no|--no-|--no-c|--no-co|--no-com|--no-comm|\
  33             --no-commi|--no-commit)
  34                 no_commit=t
  35                 ;;
  36         -e|--e|--ed|--edi|--edit)
  37                 edit=-e
  38                 ;;
  39         --n|--no|--no-|--no-e|--no-ed|--no-edi|--no-edit)
  40                 edit=
  41                 ;;
  42         -r)
  43                 : no-op ;;
  44         -x|--i-really-want-to-expose-my-private-commit-object-name)
  45                 replay=
  46                 ;;
  47         -*)
  48                 usage
  49                 ;;
  50         *)
  51                 break
  52                 ;;
  53         esac
  54         shift
  55 done
  56
  57 set_reflog_action "$me"
  58
  59 test "$me,$replay" = "revert,t" && usage
  60
  61 case "$no_commit" in
  62 t)
  63         # We do not intend to commit immediately.  We just want to
  64         # merge the differences in.
  65         head=$(git-write-tree) ||
  66                 die "Your index file is unmerged."
  67         ;;
  68 *)
  69         head=$(git-rev-parse --verify HEAD) ||
  70                 die "You do not have a valid HEAD"
  71         files=$(git-diff-index --cached --name-only $head) || exit
  72         if [ "$files" ]; then
  73                 die "Dirty index: cannot $me (dirty: $files)"
  74         fi
  75         ;;
  76 esac
  77
  78 rev=$(git-rev-parse --verify "$@") &&
  79 commit=$(git-rev-parse --verify "$rev^0") ||
  80         die "Not a single commit $@"
  81 prev=$(git-rev-parse --verify "$commit^1" 2>/dev/null) ||
  82         die "Cannot run $me a root commit"
  83 git-rev-parse --verify "$commit^2" >/dev/null 2>&1 &&
  84         die "Cannot run $me a multi-parent commit."
  85
  86 encoding=$(git config i18n.commitencoding || echo UTF-8)
  87
  88 # "commit" is an existing commit.  We would want to apply
  89 # the difference it introduces since its first parent "prev"
  90 # on top of the current HEAD if we are cherry-pick.  Or the
  91 # reverse of it if we are revert.
  92
  93 case "$me" in
  94 revert)
  95         git show -s --pretty=oneline --encoding="$encoding" $commit |
  96         sed -e '
  97                 s/^[^ ]* /Revert "/
  98                 s/$/"/
  99         '
 100         echo
 101         echo "This reverts commit $commit."
 102         test "$rev" = "$commit" ||
 103         echo "(original 'git revert' arguments: $@)"
 104         base=$commit next=$prev
 105         ;;
 106
 107 cherry-pick)
 108         pick_author_script='
 109         /^author /{
 110                 s/'\''/'\''\\'\'\''/g
 111                 h
 112                 s/^author \([^<]*\) <[^>]*> .*$/\1/
 113                 s/'\''/'\''\'\'\''/g
 114                 s/.*/GIT_AUTHOR_NAME='\''&'\''/p
 115
 116                 g
 117                 s/^author [^<]* <\([^>]*\)> .*$/\1/
 118                 s/'\''/'\''\'\'\''/g
 119                 s/.*/GIT_AUTHOR_EMAIL='\''&'\''/p
 120
 121                 g
 122                 s/^author [^<]* <[^>]*> \(.*\)$/\1/
 123                 s/'\''/'\''\'\'\''/g
 124                 s/.*/GIT_AUTHOR_DATE='\''&'\''/p
 125
 126                 q
 127         }'
 128
 129         logmsg=`git show -s --pretty=raw --encoding="$encoding" "$commit"`
 130         set_author_env=`echo "$logmsg" |
 131         LANG=C LC_ALL=C sed -ne "$pick_author_script"`
 132         eval "$set_author_env"
 133         export GIT_AUTHOR_NAME
 134         export GIT_AUTHOR_EMAIL
 135         export GIT_AUTHOR_DATE
 136
 137         echo "$logmsg" |
 138         sed -e '1,/^$/d' -e 's/^    //'
 139         case "$replay" in
 140         '')
 141                 echo "(cherry picked from commit $commit)"
 142                 test "$rev" = "$commit" ||
 143                 echo "(original 'git cherry-pick' arguments: $@)"
 144                 ;;
 145         esac
 146         base=$prev next=$commit
 147         ;;
 148
 149 esac >.msg
 150
 151 eval GITHEAD_$head=HEAD
 152 eval GITHEAD_$next='`git show -s \
 153         --pretty=oneline --encoding="$encoding" "$commit" |
 154         sed -e "s/^[^ ]* //"`'
 155 export GITHEAD_$head GITHEAD_$next
 156
 157 # This three way merge is an interesting one.  We are at
 158 # $head, and would want to apply the change between $commit
 159 # and $prev on top of us (when reverting), or the change between
 160 # $prev and $commit on top of us (when cherry-picking or replaying).
 161
 162 git-merge-recursive $base -- $head $next &&
 163 result=$(git-write-tree 2>/dev/null) || {
 164         mv -f .msg "$GIT_DIR/MERGE_MSG"
 165         {
 166             echo '
 167 Conflicts:
 168 '
 169                 git ls-files --unmerged |
 170                 sed -e 's/^[^   ]*      /       /' |
 171                 uniq
 172         } >>"$GIT_DIR/MERGE_MSG"
 173         echo >&2 "Automatic $me failed.  After resolving the conflicts,"
 174         echo >&2 "mark the corrected paths with 'git-add <paths>'"
 175         echo >&2 "and commit the result."
 176         case "$me" in
 177         cherry-pick)
 178                 echo >&2 "You may choose to use the following when making"
 179                 echo >&2 "the commit:"
 180                 echo >&2 "$set_author_env"
 181         esac
 182         exit 1
 183 }
 184 echo >&2 "Finished one $me."
 185
 186 # If we are cherry-pick, and if the merge did not result in
 187 # hand-editing, we will hit this commit and inherit the original
 188 # author date and name.
 189 # If we are revert, or if our cherry-pick results in a hand merge,
 190 # we had better say that the current user is responsible for that.
 191
 192 case "$no_commit" in
 193 '')
 194         git-commit -n -F .msg $edit
 195         rm -f .msg
 196         ;;
 197 esac