Allow "-u" flag to tag signing

The current "git tag -s" thing always uses the tagger name as the signing
user key, which is very irritating, since my key is under my email
address, but the tagger key obviously contains the actual machine name
too.

Now, I could just use "GIT_COMMITTER_EMAIL" and force it to be my real
email, but I actually think that it's nice to see which machine I use for
my work.

So rather than force my tagger ID to have to match the gpg key name, just
support the "-u" flag to "git tag" instead. It implicitly enables signing,
since it doesn't make any sense without it. Thus:

	git tag -u <gpg-key-name> <tag-name> [<tagged-object>]

will use the named gpg key for signing.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 14 insertions, 4 deletions

diff --git a/git-tag.sh b/git-tag.sh
index 76c1bcd8c..9afdf5cce 100755
--- a/git-tag.sh
+++ b/git-tag.sh
@@ -4,7 +4,7 @@
 . git-sh-setup || die "Not a git archive"
 
 usage () {
-    echo >&2 "Usage: git-tag [-a | -s] [-f] [-m "tag message"] tagname"
+    echo >&2 "Usage: git-tag [-a | -s | -u <key-id>] [-f] [-m <msg>] <tagname>"
     exit 1
 }
 
@@ -12,6 +12,7 @@ annotate=
 signed=
 force=
 message=
+username=
 while case "$#" in 0) break ;; esac
 do
     case "$1" in
@@ -30,6 +31,12 @@ do
 	shift
 	message="$1"
 	;;
+    -u)
+	annotate=1
+	signed=1
+	shift
+	username="$1"
+	;;
     -*)
         usage
 	;;
@@ -50,6 +57,7 @@ shift
 object=$(git-rev-parse --verify --default HEAD "$@") || exit 1
 type=$(git-cat-file -t $object) || exit 1
 tagger=$(git-var GIT_COMMITTER_IDENT) || exit 1
+: ${username:=$(expr "$tagger" : '\(.*>\)')}
 
 trap 'rm -f .tmp-tag* .tagmsg .editmsg' 0
 
@@ -65,13 +73,15 @@ if [ "$annotate" ]; then
 
     grep -v '^#' < .editmsg | git-stripspace > .tagmsg
 
-    [ -s .tagmsg ] || exit
+    [ -s .tagmsg ] || {
+	echo >&2 "No tag message?"
+	exit 1
+    }
 
     ( echo -e "object $object\ntype $type\ntag $name\ntagger $tagger\n"; cat .tagmsg ) > .tmp-tag
     rm -f .tmp-tag.asc .tagmsg
     if [ "$signed" ]; then
-	me=$(expr "$tagger" : '\(.*>\)') &&
-	gpg -bsa -u "$me" .tmp-tag &&
+	gpg -bsa -u "$username" .tmp-tag &&
 	cat .tmp-tag.asc >>.tmp-tag ||
 	die "failed to sign the tag with GPG."
     fi