Merge branch 'maint-1.7.11' into maint

* maint-1.7.11:
  Almost 1.7.11.6
  gitweb: URL-decode $my_url/$my_uri when stripping PATH_INFO
  rebase -i: use full onto sha1 in reflog
  sh-setup: protect from exported IFS
  receive-pack: do not leak output from auto-gc to standard output
  t/t5400: demonstrate breakage caused by informational message from prune
  setup: clarify error messages for file/revisions ambiguity
  send-email: improve RFC2047 quote parsing
  fsck: detect null sha1 in tree entries
  do not write null sha1s to on-disk index
  diff: do not use null sha1 as a sentinel value

1 files changed, 83 insertions, 0 deletions

diff --git a/t/t4054-diff-bogus-tree.sh b/t/t4054-diff-bogus-tree.sh
new file mode 100755
index 0000000000..0843c87890
--- /dev/null
+++ b/t/t4054-diff-bogus-tree.sh
@@ -0,0 +1,83 @@
+#!/bin/sh
+
+test_description='test diff with a bogus tree containing the null sha1'
+. ./test-lib.sh
+
+empty_tree=4b825dc642cb6eb9a060e54bf8d69288fbee4904
+
+test_expect_success 'create bogus tree' '
+	bogus_tree=$(
+		printf "100644 fooQQQQQQQQQQQQQQQQQQQQQ" |
+		q_to_nul |
+		git hash-object -w --stdin -t tree
+	)
+'
+
+test_expect_success 'create tree with matching file' '
+	echo bar >foo &&
+	git add foo &&
+	good_tree=$(git write-tree)
+	blob=$(git rev-parse :foo)
+'
+
+test_expect_success 'raw diff shows null sha1 (addition)' '
+	echo ":000000 100644 $_z40 $_z40 A	foo" >expect &&
+	git diff-tree $empty_tree $bogus_tree >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'raw diff shows null sha1 (removal)' '
+	echo ":100644 000000 $_z40 $_z40 D	foo" >expect &&
+	git diff-tree $bogus_tree $empty_tree >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'raw diff shows null sha1 (modification)' '
+	echo ":100644 100644 $blob $_z40 M	foo" >expect &&
+	git diff-tree $good_tree $bogus_tree >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'raw diff shows null sha1 (other direction)' '
+	echo ":100644 100644 $_z40 $blob M	foo" >expect &&
+	git diff-tree $bogus_tree $good_tree >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'raw diff shows null sha1 (reverse)' '
+	echo ":100644 100644 $_z40 $blob M	foo" >expect &&
+	git diff-tree -R $good_tree $bogus_tree >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'raw diff shows null sha1 (index)' '
+	echo ":100644 100644 $_z40 $blob M	foo" >expect &&
+	git diff-index $bogus_tree >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'patch fails due to bogus sha1 (addition)' '
+	test_must_fail git diff-tree -p $empty_tree $bogus_tree
+'
+
+test_expect_success 'patch fails due to bogus sha1 (removal)' '
+	test_must_fail git diff-tree -p $bogus_tree $empty_tree
+'
+
+test_expect_success 'patch fails due to bogus sha1 (modification)' '
+	test_must_fail git diff-tree -p $good_tree $bogus_tree
+'
+
+test_expect_success 'patch fails due to bogus sha1 (other direction)' '
+	test_must_fail git diff-tree -p $bogus_tree $good_tree
+'
+
+test_expect_success 'patch fails due to bogus sha1 (reverse)' '
+	test_must_fail git diff-tree -R -p $good_tree $bogus_tree
+'
+
+test_expect_success 'patch fails due to bogus sha1 (index)' '
+	test_must_fail git diff-index -p $bogus_tree
+'
+
+test_done