Merge branch 'jk/loose-object-info-report-error'

Update error handling for codepath that deals with corrupt loose
objects.

* jk/loose-object-info-report-error:
  index-pack: detect local corruption in collision check
  sha1_loose_object_info: return error for corrupted objects

Author: gitster

builtin/index-pack.c

@@ -810,6 +810,8 @@ static void sha1_object(const void *data, struct object_entry *obj_entry,
 		unsigned long has_size;
 		read_lock();
 		has_type = sha1_object_info(sha1, &has_size);
+		if (has_type < 0)
+			die(_("cannot read existing object info %s"), sha1_to_hex(sha1));
 		if (has_type != type || has_size != size)
 			die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
 		has_data = read_sha1_file(sha1, &has_type, &has_size);

sha1_file.c

@@ -2952,7 +2952,7 @@ static int sha1_loose_object_info(const unsigned char *sha1,
 	if (status && oi->typep)
 		*oi->typep = status;
 	strbuf_release(&hdrbuf);
-	return 0;
+	return (status < 0) ? status : 0;
 }
 
 int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags)

t/t1060-object-corruption.sh

@@ -21,6 +21,14 @@ test_expect_success 'setup corrupt repo' '
 		cd bit-error &&
 		test_commit content &&
 		corrupt_byte HEAD:content.t 10
+	) &&
+	git init no-bit-error &&
+	(
+		# distinct commit from bit-error, but containing a
+		# non-corrupted version of the same blob
+		cd no-bit-error &&
+		test_tick &&
+		test_commit content
 	)
 '
 
@@ -53,6 +61,13 @@ test_expect_success 'streaming a corrupt blob fails' '
 	)
 '
 
+test_expect_success 'getting type of a corrupt blob fails' '
+	(
+		cd bit-error &&
+		test_must_fail git cat-file -s HEAD:content.t
+	)
+'
+
 test_expect_success 'read-tree -u detects bit-errors in blobs' '
 	(
 		cd bit-error &&
@@ -101,4 +116,13 @@ test_expect_failure 'clone --local detects misnamed objects' '
 	test_must_fail git clone --local misnamed misnamed-checkout
 '
 
+test_expect_success 'fetch into corrupted repo with index-pack' '
+	(
+		cd bit-error &&
+		test_must_fail git -c transfer.unpackLimit=1 \
+			fetch ../no-bit-error 2>stderr &&
+		test_i18ngrep ! -i collision stderr
+	)
+'
+
 test_done