[PATCH 2/2] git-verify-tag: detect wrong syntax

[Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>]

From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>

Print proper error messages when failing, and handle -h/--help to avoid, if
possible, to print double error message (from git-cat-file and from
git-verify-tag).

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
---

 git-verify-tag.sh |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/git-verify-tag.sh b/git-verify-tag.sh
--- a/git-verify-tag.sh
+++ b/git-verify-tag.sh
@@ -1,9 +1,16 @@
 #!/bin/sh
 . git-sh-setup || die "Not a git archive"
 
+usage() {
+	die "usage: git-verify-tag <tag>"
+}
+
+[ $# = 1 ] || usage
+[ "$1" = "-h" -o "$1" = "--help" ] && usage
+
 tag=$(git-rev-parse $1) || exit 1
 
-type=$(git-cat-file -t $tag) || exit 1
+type=$(git-cat-file -t $tag) || usage
 [ "$type" = "commit" ] && die "Light tag - verification impossible"
 [ "$type" = "tag" ] || die "Bad tag - SHA1 doesn't refer to a tag object nor to a commit one."