Improve error messages from 'git stash show'

The previous error message "fatal: Needed a single revision" is not
very informative.

Signed-off-by: Gustaf Hendeby <hendeby@isy.liu.se>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-stash.sh b/git-stash.sh
index aa47e541ee4fe55254edc3fb59ef534ba4d5be66..59db3dc38e72fda88d521171a174c08b919677a9 100755 (executable)
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -210,14 +210,18 @@ list_stash () {
 }
 
 show_stash () {
+       have_stash || die 'No stash found'
+
        flags=$(git rev-parse --no-revs --flags "$@")
        if test -z "$flags"
        then
                flags=--stat
        fi
 
-       w_commit=$(git rev-parse --verify --default $ref_stash "$@") &&
-       b_commit=$(git rev-parse --verify "$w_commit^") &&
+       w_commit=$(git rev-parse --quiet --verify --default $ref_stash "$@") &&
+       b_commit=$(git rev-parse --quiet --verify "$w_commit^") ||
+               die "'$*' is not a stash"
+
        git diff $flags $b_commit $w_commit
 }