[PATCH 05/11] Resumable clone: add output parsing to connect.c

[Kevin Wern <kevin.m.wern@gmail.com>]

Add method for transport to call when parsing primeclone output from
stdin. Suppress stderr when using git_connect with ssh, unless output
is verbose.

Signed-off-by: Kevin Wern <kevin.m.wern@gmail.com>
---
 connect.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 connect.h | 10 ++++++----
 2 files changed, 53 insertions(+), 4 deletions(-)

diff --git a/connect.c b/connect.c
index 0478631..284de53 100644
--- a/connect.c
+++ b/connect.c
@@ -804,6 +804,10 @@ struct child_process *git_connect(int fd[2], const char *url,
 		}
 		argv_array_push(&conn->args, cmd.buf);
 
+		if (flags & CONNECT_SUPPRESS_ERRORS) {
+			conn->no_stderr = 1;
+		}
+
 		if (start_command(conn))
 			die("unable to fork");
 
@@ -831,3 +835,46 @@ int finish_connect(struct child_process *conn)
 	free(conn);
 	return code;
 }
+
+const struct alt_resource *const get_alt_res_connect(int fd, int flags)
+{
+	struct alt_resource *res = NULL;
+	const char *line;
+	char *url = NULL, *filetype = NULL;
+	char *error_string = NULL;
+
+	while (line = packet_read_line_gentle(fd, NULL)) {
+		const char *space = strchr(line, ' ');
+
+		// We will eventually support multiple resources, so always
+		// parse the whole message
+		if ((filetype && url) || error_string) {
+			continue;
+		}
+		if (skip_prefix(line, "ERR ", &line) || !space ||
+				strchr(space + 1, ' ')) {
+			error_string = xstrdup(line);
+			continue;
+		}
+		filetype = xstrndup(line, (space - line));
+		url = xstrdup(space + 1);
+	}
+
+	if (filetype && url && !error_string){
+		res = xcalloc(1, sizeof(*res));
+		res->filetype = filetype;
+		res->url = url;
+	}
+	else {
+		if (!(flags & CONNECT_SUPPRESS_ERRORS)) {
+			if (error_string)
+				fprintf(stderr, "prime clone protocol error: "
+					"got '%s'\n", error_string);
+			else
+				fprintf(stderr, "did not get required "
+					"components for alternate resource\n");
+		}
+	}
+
+	return res;
+}
diff --git a/connect.h b/connect.h
index 01f14cd..966c0eb 100644
--- a/connect.h
+++ b/connect.h
@@ -1,10 +1,11 @@
 #ifndef CONNECT_H
 #define CONNECT_H
 
-#define CONNECT_VERBOSE       (1u << 0)
-#define CONNECT_DIAG_URL      (1u << 1)
-#define CONNECT_IPV4          (1u << 2)
-#define CONNECT_IPV6          (1u << 3)
+#define CONNECT_VERBOSE         (1u << 0)
+#define CONNECT_DIAG_URL        (1u << 1)
+#define CONNECT_IPV4            (1u << 2)
+#define CONNECT_IPV6            (1u << 3)
+#define CONNECT_SUPPRESS_ERRORS (1u << 4)
 extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
 extern int finish_connect(struct child_process *conn);
 extern int git_connection_is_socket(struct child_process *conn);
@@ -12,5 +13,6 @@ extern int server_supports(const char *feature);
 extern int parse_feature_request(const char *features, const char *feature);
 extern const char *server_feature_value(const char *feature, int *len_ret);
 extern int url_is_local_not_ssh(const char *url);
+const struct alt_resource *const get_alt_res_connect(int fd, int flags);
 
 #endif
-- 
2.7.4