+#!/bin/sh
+
+test_description='detect unwritable repository and fail correctly'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+
+ >file &&
+ git add file &&
+ git commit -m initial &&
+ echo >file &&
+ git add file
+
+'
+
+test_expect_success 'write-tree should notice unwritable repository' '
+
+ (
+ chmod a-w .git/objects
+ test_must_fail git write-tree
+ )
+ status=$?
+ chmod 775 .git/objects
+ (exit $status)
+
+'
+
+test_expect_success 'commit should notice unwritable repository' '
+
+ (
+ chmod a-w .git/objects
+ test_must_fail git commit -m second
+ )
+ status=$?
+ chmod 775 .git/objects
+ (exit $status)
+
+'
+
+test_expect_success 'update-index should notice unwritable repository' '
+
+ (
+ echo a >file &&
+ chmod a-w .git/objects
+ test_must_fail git update-index file
+ )
+ status=$?
+ chmod 775 .git/objects
+ (exit $status)
+
+'
+
+test_expect_success 'add should notice unwritable repository' '
+
+ (
+ echo b >file &&
+ chmod a-w .git/objects
+ test_must_fail git add file
+ )
+ status=$?
+ chmod 775 .git/objects
+ (exit $status)
+
+'
+
+test_done