git-show: do not segfault when showing a bad tag
When a tag points at a bad or nonexistent object, we should diagnose the
breakage and exit. An earlier commit 4f3dcc2 (Fix 'git show' on signed
tag of signed tag of commit, 2008-07-01) lost this check and made it
segfault instead; not good.
This fixes it.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/t7007-show.sh b/t/t7007-show.sh
new file mode 100755
index 0000000..cce222f
--- /dev/null
+++ b/t/t7007-show.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+
+test_description='git show'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+ echo hello world >foo &&
+ H=$(git hash-object -w foo) &&
+ git tag -a foo-tag -m "Tags $H" $H &&
+ HH=$(expr "$H" : "\(..\)") &&
+ H38=$(expr "$H" : "..\(.*\)") &&
+ rm -f .git/objects/$HH/$H38
+'
+
+test_expect_success 'showing a tag that point at a missing object' '
+ test_must_fail git --no-pager show foo-tag
+'
+
+test_done
