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Diffstat (limited to 'contrib/examples/git-revert.sh')
| -rwxr-xr-x | contrib/examples/git-revert.sh | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/contrib/examples/git-revert.sh b/contrib/examples/git-revert.sh new file mode 100755 index 000000000..49f00321b --- /dev/null +++ b/contrib/examples/git-revert.sh @@ -0,0 +1,197 @@ +#!/bin/sh +# +# Copyright (c) 2005 Linus Torvalds +# Copyright (c) 2005 Junio C Hamano +# + +case "$0" in +*-revert* ) + test -t 0 && edit=-e + replay= + me=revert + USAGE='[--edit | --no-edit] [-n] <commit-ish>' ;; +*-cherry-pick* ) + replay=t + edit= + me=cherry-pick + USAGE='[--edit] [-n] [-r] [-x] <commit-ish>' ;; +* ) + echo >&2 "What are you talking about?" + exit 1 ;; +esac + +SUBDIRECTORY_OK=Yes ;# we will cd up +. git-sh-setup +require_work_tree +cd_to_toplevel + +no_commit= +while case "$#" in 0) break ;; esac +do + case "$1" in + -n|--n|--no|--no-|--no-c|--no-co|--no-com|--no-comm|\ + --no-commi|--no-commit) + no_commit=t + ;; + -e|--e|--ed|--edi|--edit) + edit=-e + ;; + --n|--no|--no-|--no-e|--no-ed|--no-edi|--no-edit) + edit= + ;; + -r) + : no-op ;; + -x|--i-really-want-to-expose-my-private-commit-object-name) + replay= + ;; + -*) + usage + ;; + *) + break + ;; + esac + shift +done + +set_reflog_action "$me" + +test "$me,$replay" = "revert,t" && usage + +case "$no_commit" in +t) + # We do not intend to commit immediately. We just want to + # merge the differences in. + head=$(git-write-tree) || + die "Your index file is unmerged." + ;; +*) + head=$(git-rev-parse --verify HEAD) || + die "You do not have a valid HEAD" + files=$(git-diff-index --cached --name-only $head) || exit + if [ "$files" ]; then + die "Dirty index: cannot $me (dirty: $files)" + fi + ;; +esac + +rev=$(git-rev-parse --verify "$@") && +commit=$(git-rev-parse --verify "$rev^0") || + die "Not a single commit $@" +prev=$(git-rev-parse --verify "$commit^1" 2>/dev/null) || + die "Cannot run $me a root commit" +git-rev-parse --verify "$commit^2" >/dev/null 2>&1 && + die "Cannot run $me a multi-parent commit." + +encoding=$(git config i18n.commitencoding || echo UTF-8) + +# "commit" is an existing commit. We would want to apply +# the difference it introduces since its first parent "prev" +# on top of the current HEAD if we are cherry-pick. Or the +# reverse of it if we are revert. + +case "$me" in +revert) + git show -s --pretty=oneline --encoding="$encoding" $commit | + sed -e ' + s/^[^ ]* /Revert "/ + s/$/"/ + ' + echo + echo "This reverts commit $commit." + test "$rev" = "$commit" || + echo "(original 'git revert' arguments: $@)" + base=$commit next=$prev + ;; + +cherry-pick) + pick_author_script=' + /^author /{ + s/'\''/'\''\\'\'\''/g + h + s/^author \([^<]*\) <[^>]*> .*$/\1/ + s/'\''/'\''\'\'\''/g + s/.*/GIT_AUTHOR_NAME='\''&'\''/p + + g + s/^author [^<]* <\([^>]*\)> .*$/\1/ + s/'\''/'\''\'\'\''/g + s/.*/GIT_AUTHOR_EMAIL='\''&'\''/p + + g + s/^author [^<]* <[^>]*> \(.*\)$/\1/ + s/'\''/'\''\'\'\''/g + s/.*/GIT_AUTHOR_DATE='\''&'\''/p + + q + }' + + logmsg=`git show -s --pretty=raw --encoding="$encoding" "$commit"` + set_author_env=`echo "$logmsg" | + LANG=C LC_ALL=C sed -ne "$pick_author_script"` + eval "$set_author_env" + export GIT_AUTHOR_NAME + export GIT_AUTHOR_EMAIL + export GIT_AUTHOR_DATE + + echo "$logmsg" | + sed -e '1,/^$/d' -e 's/^ //' + case "$replay" in + '') + echo "(cherry picked from commit $commit)" + test "$rev" = "$commit" || + echo "(original 'git cherry-pick' arguments: $@)" + ;; + esac + base=$prev next=$commit + ;; + +esac >.msg + +eval GITHEAD_$head=HEAD +eval GITHEAD_$next='`git show -s \ + --pretty=oneline --encoding="$encoding" "$commit" | + sed -e "s/^[^ ]* //"`' +export GITHEAD_$head GITHEAD_$next + +# This three way merge is an interesting one. We are at +# $head, and would want to apply the change between $commit +# and $prev on top of us (when reverting), or the change between +# $prev and $commit on top of us (when cherry-picking or replaying). + +git-merge-recursive $base -- $head $next && +result=$(git-write-tree 2>/dev/null) || { + mv -f .msg "$GIT_DIR/MERGE_MSG" + { + echo ' +Conflicts: +' + git ls-files --unmerged | + sed -e 's/^[^ ]* / /' | + uniq + } >>"$GIT_DIR/MERGE_MSG" + echo >&2 "Automatic $me failed. After resolving the conflicts," + echo >&2 "mark the corrected paths with 'git-add <paths>'" + echo >&2 "and commit the result." + case "$me" in + cherry-pick) + echo >&2 "You may choose to use the following when making" + echo >&2 "the commit:" + echo >&2 "$set_author_env" + esac + exit 1 +} +echo >&2 "Finished one $me." + +# If we are cherry-pick, and if the merge did not result in +# hand-editing, we will hit this commit and inherit the original +# author date and name. +# If we are revert, or if our cherry-pick results in a hand merge, +# we had better say that the current user is responsible for that. + +case "$no_commit" in +'') + git-commit -n -F .msg $edit + rm -f .msg + ;; +esac |