bundle-uri: serve bundle.* keys from config

Implement the "bundle-uri" protocol v2 capability by populating the
key=value packet lines from the local Git config. The list of bundles is
provided from the keys beginning with "bundle.".

In the future, we may want to filter this list to be more specific to
the exact known keys that the server intends to share, but for
flexibility at the moment we will assume that the config values are
well-formed.

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

bundle-uri.c

@@ -581,6 +581,16 @@ cached:
 	return advertise_bundle_uri;
 }
 
+static int config_to_packet_line(const char *key, const char *value, void *data)
+{
+	struct packet_reader *writer = data;
+
+	if (!strncmp(key, "bundle.", 7))
+		packet_write_fmt(writer->fd, "%s=%s", key, value);
+
+	return 0;
+}
+
 int bundle_uri_command(struct repository *r,
 		       struct packet_reader *request)
 {
@@ -592,7 +602,11 @@ int bundle_uri_command(struct repository *r,
 	if (request->status != PACKET_READ_FLUSH)
 		die(_("bundle-uri: expected flush after arguments"));
 
-	/* TODO: Implement the communication */
+	/*
+	 * Read all "bundle.*" config lines to the client as key=value
+	 * packet lines.
+	 */
+	git_config(config_to_packet_line, &writer);
 
 	packet_writer_flush(&writer);
 

t/lib-bundle-uri-protocol.sh

@@ -136,6 +136,8 @@ test_expect_success "test bundle-uri with $BUNDLE_URI_PROTOCOL:// using protocol
 	[bundle]
 		version = 1
 		mode = all
+	[bundle "only"]
+		uri = $BUNDLE_URI_BUNDLE_URI_ESCAPED
 	EOF
 
 	test-tool bundle-uri \
@@ -157,6 +159,36 @@ test_expect_success "test bundle-uri with $BUNDLE_URI_PROTOCOL:// using protocol
 	[bundle]
 		version = 1
 		mode = all
+	[bundle "only"]
+		uri = $BUNDLE_URI_BUNDLE_URI_ESCAPED
+	EOF
+
+	test-tool bundle-uri \
+		ls-remote \
+		"$BUNDLE_URI_REPO_URI" \
+		>actual &&
+	test_cmp_config_output expect actual
+'
+
+test_expect_success "test bundle-uri with $BUNDLE_URI_PROTOCOL:// using protocol v2 with list" '
+	test_config -C "$BUNDLE_URI_PARENT" \
+		bundle.bundle1.uri "$BUNDLE_URI_BUNDLE_URI_ESCAPED-1.bdl" &&
+	test_config -C "$BUNDLE_URI_PARENT" \
+		bundle.bundle2.uri "$BUNDLE_URI_BUNDLE_URI_ESCAPED-2.bdl" &&
+	test_config -C "$BUNDLE_URI_PARENT" \
+		bundle.bundle3.uri "$BUNDLE_URI_BUNDLE_URI_ESCAPED-3.bdl" &&
+
+	# All data about bundle URIs
+	cat >expect <<-EOF &&
+	[bundle]
+		version = 1
+		mode = all
+	[bundle "bundle1"]
+		uri = $BUNDLE_URI_BUNDLE_URI_ESCAPED-1.bdl
+	[bundle "bundle2"]
+		uri = $BUNDLE_URI_BUNDLE_URI_ESCAPED-2.bdl
+	[bundle "bundle3"]
+		uri = $BUNDLE_URI_BUNDLE_URI_ESCAPED-3.bdl
 	EOF
 
 	test-tool bundle-uri \