[PATCH/RFC] contrib: git-c2t converts tag creating commits to tags
- From
Michael J Gruber <git@drmicha.warpmail.net>
- Date
- May 27, 2011, 13:52 UTC
- Message-ID
- <59fe17310157f99d5f20173ed65408d9e1f33462.1306504356.git.git@drmicha.warpmail.net>
Introduce git-c2t <commit> <tag> which converts a commit object <commit> into a tag object (and tags it with <tagname>), under the provision that <commit> has exactly one parent and has the same tree. That tag points at the parent commit.
This is useful for converting "tag creating commits" such as those produced by git-svn into proper git tags. Tag creating commits typically create a "1-commit side branch" whereas the tag created by c2t points at the pseudo fork point (the commit being tagged).
Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net> --- contrib/git-c2t.sh | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 46 insertions(+), 0 deletions(-) create mode 100755 contrib/git-c2t.sh
diff --git a/contrib/git-c2t.sh b/contrib/git-c2t.sh new file mode 100755 index 0000000..14c9bf0 --- /dev/null +++ b/contrib/git-c2t.sh @@ -0,0 +1,46 @@ +#!/bin/sh + +die () { + echo "$@" + rm -f "$tagfile" + exit 1 +} + +warn () { + echo "$@" +} + +test $# -eq 2 || die "Usage: $0 <commit> <tagname>" + +tagname="$2" +commit="$1" + +git rev-parse --verify -q "$commit" >/dev/null || die "Cannot parse $commit." + +test x$(git cat-file -t $commit) == "xcommit" || die "$commit is no commit." + +tagfile=$(mktemp) + +git cat-file commit "$commit" | { + read drop tree + test $drop == "tree" || die "No tree." + read drop parent + test $drop = "parent" || die "No parent." + read drop author + test $drop == "author" || die "No author." + read drop committer + test $drop == "committer" || die "No committer." + test "$author" == "$committer" || warn "author $author != committer $committer, taking author." + ptree=$(git cat-file -p $parent|fgrep tree|head -1|cut -d' ' -f2) + test $ptree == $tree || die "commit $commit introduces a diff." + cat <<EOF >$tagfile +object $parent +type commit +tag $tagname +tagger $author +EOF + cat >>$tagfile + hash=$(git hash-object -t tag -w "$tagfile") + git tag "$tagname" $hash +} +rm -f $tagfile
-- 1.7.5.3.688.g647459