bundle-uri: quiet failed unbundlings

When downloading a list of bundles in "all" mode, Git has no
understanding of the dependencies between the bundles. Git attempts to
unbundle the bundles in some order, but some may not pass the
verify_bundle() step because of missing prerequisites. This is passed as
error messages to the user, even when they eventually succeed in later
attempts after their dependent bundles are unbundled.

Add a new VERIFY_BUNDLE_QUIET flag to verify_bundle() that avoids the
error messages from the missing prerequisite commits. The method still
returns the number of missing prerequisit commits, allowing callers to
unbundle() to notice that the bundle failed to apply.

Use this flag in bundle-uri.c and test that the messages go away for
'git clone --bundle-uri' commands.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: derrickstolee

builtin/bundle.c

@@ -120,7 +120,7 @@ static int cmd_bundle_verify(int argc, const char **argv, const char *prefix) {
 	}
 	close(bundle_fd);
 	if (verify_bundle(the_repository, &header,
-			  quiet ? 0 : VERIFY_BUNDLE_VERBOSE)) {
+			  quiet ? VERIFY_BUNDLE_QUIET : VERIFY_BUNDLE_VERBOSE)) {
 		ret = 1;
 		goto cleanup;
 	}

bundle-uri.c

@@ -308,7 +308,8 @@ static int unbundle_from_file(struct repository *r, const char *file)
 	 * a reachable ref pointing to the new tips, which will reach
 	 * the prerequisite commits.
 	 */
-	if ((result = unbundle(r, &header, bundle_fd, NULL, 0)))
+	if ((result = unbundle(r, &header, bundle_fd, NULL,
+			       VERIFY_BUNDLE_QUIET)))
 		return 1;
 
 	/*

bundle.c

@@ -216,7 +216,10 @@ int verify_bundle(struct repository *r,
 			add_pending_object(&revs, o, name);
 			continue;
 		}
-		if (++ret == 1)
+		ret++;
+		if (flags & VERIFY_BUNDLE_QUIET)
+			continue;
+		if (ret == 1)
 			error("%s", message);
 		error("%s %s", oid_to_hex(oid), name);
 	}
@@ -243,7 +246,10 @@ int verify_bundle(struct repository *r,
 		assert(o); /* otherwise we'd have returned early */
 		if (o->flags & SHOWN)
 			continue;
-		if (++ret == 1)
+		ret++;
+		if (flags & VERIFY_BUNDLE_QUIET)
+			continue;
+		if (ret == 1)
 			error("%s", message);
 		error("%s %s", oid_to_hex(oid), name);
 	}

bundle.h

@@ -32,6 +32,7 @@ int create_bundle(struct repository *r, const char *path,
 
 enum verify_bundle_flags {
 	VERIFY_BUNDLE_VERBOSE = (1 << 0),
+	VERIFY_BUNDLE_QUIET = (1 << 1),
 };
 
 int verify_bundle(struct repository *r, struct bundle_header *header,

t/t5558-clone-bundle-uri.sh

@@ -99,7 +99,10 @@ test_expect_success 'clone bundle list (file, no heuristic)' '
 		uri = file://$(pwd)/clone-from/bundle-4.bundle
 	EOF
 
-	git clone --bundle-uri="file://$(pwd)/bundle-list" clone-from clone-list-file &&
+	git clone --bundle-uri="file://$(pwd)/bundle-list" \
+		clone-from clone-list-file 2>err &&
+	! grep "Repository lacks these prerequisite commits" err &&
+
 	git -C clone-from for-each-ref --format="%(objectname)" >oids &&
 	git -C clone-list-file cat-file --batch-check <oids &&
 
@@ -141,7 +144,10 @@ test_expect_success 'clone bundle list (file, all mode, some failures)' '
 	EOF
 
 	GIT_TRACE2_PERF=1 \
-	git clone --bundle-uri="file://$(pwd)/bundle-list" clone-from clone-all-some &&
+	git clone --bundle-uri="file://$(pwd)/bundle-list" \
+		clone-from clone-all-some 2>err &&
+	! grep "Repository lacks these prerequisite commits" err &&
+
 	git -C clone-from for-each-ref --format="%(objectname)" >oids &&
 	git -C clone-all-some cat-file --batch-check <oids &&
 
@@ -169,7 +175,10 @@ test_expect_success 'clone bundle list (file, all mode, all failures)' '
 		uri = file://$(pwd)/clone-from/bundle-5.bundle
 	EOF
 
-	git clone --bundle-uri="file://$(pwd)/bundle-list" clone-from clone-all-fail &&
+	git clone --bundle-uri="file://$(pwd)/bundle-list" \
+		clone-from clone-all-fail 2>err &&
+	! grep "Repository lacks these prerequisite commits" err &&
+
 	git -C clone-from for-each-ref --format="%(objectname)" >oids &&
 	git -C clone-all-fail cat-file --batch-check <oids &&
 
@@ -195,7 +204,10 @@ test_expect_success 'clone bundle list (file, any mode)' '
 		uri = file://$(pwd)/clone-from/bundle-5.bundle
 	EOF
 
-	git clone --bundle-uri="file://$(pwd)/bundle-list" clone-from clone-any-file &&
+	git clone --bundle-uri="file://$(pwd)/bundle-list" \
+		clone-from clone-any-file 2>err &&
+	! grep "Repository lacks these prerequisite commits" err &&
+
 	git -C clone-from for-each-ref --format="%(objectname)" >oids &&
 	git -C clone-any-file cat-file --batch-check <oids &&
 
@@ -284,7 +296,10 @@ test_expect_success 'clone bundle list (HTTP, no heuristic)' '
 		uri = $HTTPD_URL/bundle-4.bundle
 	EOF
 
-	git clone --bundle-uri="$HTTPD_URL/bundle-list" clone-from clone-list-http &&
+	git clone --bundle-uri="$HTTPD_URL/bundle-list" \
+		clone-from clone-list-http  2>err &&
+	! grep "Repository lacks these prerequisite commits" err &&
+
 	git -C clone-from for-each-ref --format="%(objectname)" >oids &&
 	git -C clone-list-http cat-file --batch-check <oids
 '