contrib/git-c2t.sh

   1 #!/bin/sh
   2
   3 die () {
   4         echo "$@"
   5         rm -f "$tagfile"
   6         exit 1
   7 }
   8
   9 warn () {
  10         echo "$@"
  11 }
  12
  13 test $# -eq 2 || die "Usage: $0 <commit> <tagname>"
  14
  15 tagname="$2"
  16 commit="$1"
  17
  18 git rev-parse --verify -q "$commit" >/dev/null || die "Cannot parse $commit."
  19
  20 test x$(git cat-file -t $commit) == "xcommit" || die "$commit is no commit."
  21
  22 tagfile=$(mktemp)
  23
  24 git cat-file commit "$commit" | {
  25         read drop tree
  26         test $drop == "tree" || die "No tree."
  27         read drop parent
  28         test $drop = "parent" || die "No parent."
  29         read drop author
  30         test $drop == "author" || die "No author."
  31         read drop committer
  32         test $drop == "committer" || die "No committer."
  33         test "$author" == "$committer" || warn "author $author != committer $committer, taking author."
  34         ptree=$(git cat-file -p $parent|fgrep tree|head -1|cut -d' ' -f2)
  35         test $ptree == $tree || die "commit $commit introduces a diff."
  36         cat <<EOF >$tagfile
  37 object $parent
  38 type commit
  39 tag $tagname
  40 tagger $author
  41 EOF
  42         cat >>$tagfile
  43         hash=$(git hash-object -t tag -w "$tagfile")
  44         git tag "$tagname" $hash
  45 }
  46 rm -f $tagfile