http: fix the silent ignoring of proxy misconfiguraion

Earlier, the whole http.proxy option string was passed to curl without any preprocessing so curl could complain about the invalid proxy configuration. After the commit 372370f167 ("http: use credential API to handle proxy authentication", 2016-01-26), if the user specified an invalid HTTP proxy option in the configuration, then the option parsing silently fails and NULL will be passed to curl as a proxy. This forces curl to fall back to detecting the proxy configuration from the environment, causing the http.proxy option ignoring. Fix this issue by checking the proxy option parsing result. If parsing failed then print an error message and die. Such behaviour allows the user to quickly figure the proxy misconfiguration and correct it. Helped-by: Jeff King <peff@peff.net> Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Sergey Ryazanov committed Apr 11, 2017 at 23:22 UTC ae51d91105981888f58ad21825b4ef0c540032e3
1 file changed +3
http.c
+3
@@ -867,6 +867,9 @@ static CURL *get_curl_handle(void)
867 strbuf_release(&url);
868 }
869
870 + if (!proxy_auth.host)
871 + die("Invalid proxy URL '%s'", curl_http_proxy);
872 +
873 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
874 #if LIBCURL_VERSION_NUM >= 0x071304
875 var_override(&curl_no_proxy, getenv("NO_PROXY"));