Add CURLOPT_UNIX_SOCKET_PATH support to http.c

git-curl-compat.h

@@ -74,6 +74,13 @@
 #define GIT_CURL_HAVE_CURLE_SSL_PINNEDPUBKEYNOTMATCH 1
 #endif
 
+/**
+ * CURLOPT_UNIX_SOCKET_PATH was added in 7.40.0, released in January 2015.
+ */
+#if LIBCURL_VERSION_NUM >= 0x074000
+#define GIT_CURL_HAVE_CURLOPT_UNIX_SOCKET_PATH 1
+#endif
+
 /**
  * CURL_HTTP_VERSION_2 was added in 7.43.0, released in June 2015.
  *

http.c

@@ -79,6 +79,9 @@ static const char *http_proxy_ssl_ca_info;
 static struct credential proxy_cert_auth = CREDENTIAL_INIT;
 static int proxy_ssl_cert_password_required;
 
+#if defined(GIT_CURL_HAVE_CURLOPT_UNIX_SOCKET_PATH) && !defined(NO_UNIX_SOCKETS)
+static const char *curl_unix_socket_path;
+#endif
 static struct {
 	const char *name;
 	long curlauth_param;
@@ -455,6 +458,20 @@ static int http_options(const char *var, const char *value,
 		return 0;
 	}
 
+	if (!strcmp("http.unixsocket", var)) {
+#ifdef GIT_CURL_HAVE_CURLOPT_UNIX_SOCKET_PATH
+#ifndef NO_UNIX_SOCKETS
+		return git_config_string(&curl_unix_socket_path, var, value);
+#else
+		warning(_("Unix socket support unavailable in this build of Git"));
+		return 0;
+#endif
+#else
+		warning(_("Unix socket support is not supported with cURL < 7.40.0"));
+		return 0;
+#endif
+	}
+
 	if (!strcmp("http.cookiefile", var))
 		return git_config_pathname(&curl_cookie_file, var, value);
 	if (!strcmp("http.savecookies", var)) {
@@ -1203,6 +1220,12 @@ static CURL *get_curl_handle(void)
 	}
 	init_curl_proxy_auth(result);
 
+#if defined(GIT_CURL_HAVE_CURLOPT_UNIX_SOCKET_PATH) && !defined(NO_UNIX_SOCKETS)
+	if (curl_unix_socket_path) {
+		curl_easy_setopt(result, CURLOPT_UNIX_SOCKET_PATH, curl_unix_socket_path);
+	}
+#endif
+
 	set_curl_keepalive(result);
 
 	return result;