http-push: enable "proactive auth"

Before commit 986bbc0, git was proactive about asking for
http passwords. It assumed that if you had a username in
your URL, you would also want a password, and asked for it
before making any http requests.

However, this could interfere with the use of .netrc (see
986bbc0 for details). And it was also unnecessary, since
the http fetching code had learned to recognize an HTTP 401
and prompt the user then. Furthermore, the proactive prompt
could interfere with the usage of .netrc (see 986bbc0 for
details).

Unfortunately, the http push-over-DAV code never learned to
recognize HTTP 401, and so was broken by this change. This
patch does a quick fix of re-enabling the "proactive auth"
strategy only for http-push, leaving the dumb http fetch and
smart-http as-is.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

http-fetch.c

@@ -67,7 +67,7 @@ int main(int argc, const char **argv)
 
 	git_config(git_default_config, NULL);
 
-	http_init(NULL, url);
+	http_init(NULL, url, 0);
 	walker = get_http_walker(url);
 	walker->get_tree = get_tree;
 	walker->get_history = get_history;

http-push.c

@@ -1820,7 +1820,7 @@ int main(int argc, char **argv)
 
 	memset(remote_dir_exists, -1, 256);
 
-	http_init(NULL, repo->url);
+	http_init(NULL, repo->url, 1);
 
 #ifdef USE_CURL_MULTI
 	is_running_queue = 0;

http.c

@@ -43,6 +43,7 @@ static int curl_ftp_no_epsv;
 static const char *curl_http_proxy;
 static const char *curl_cookie_file;
 static char *user_name, *user_pass, *description;
+static int http_proactive_auth;
 static const char *user_agent;
 
 #if LIBCURL_VERSION_NUM >= 0x071700
@@ -279,6 +280,9 @@ static CURL *get_curl_handle(void)
 	curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 #endif
 
+	if (http_proactive_auth)
+		init_curl_http_auth(result);
+
 	if (ssl_cert != NULL)
 		curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 	if (has_cert_password())
@@ -367,7 +371,7 @@ static void set_from_env(const char **var, const char *envname)
 		*var = val;
 }
 
-void http_init(struct remote *remote, const char *url)
+void http_init(struct remote *remote, const char *url, int proactive_auth)
 {
 	char *low_speed_limit;
 	char *low_speed_time;
@@ -378,6 +382,8 @@ void http_init(struct remote *remote, const char *url)
 
 	curl_global_init(CURL_GLOBAL_ALL);
 
+	http_proactive_auth = proactive_auth;
+
 	if (remote && remote->http_proxy)
 		curl_http_proxy = xstrdup(remote->http_proxy);
 

http.h

@@ -86,7 +86,8 @@ extern void add_fill_function(void *data, int (*fill)(void *));
 extern void step_active_slots(void);
 #endif
 
-extern void http_init(struct remote *remote, const char *url);
+extern void http_init(struct remote *remote, const char *url,
+		      int proactive_auth);
 extern void http_cleanup(void);
 
 extern int data_received;

remote-curl.c

@@ -859,7 +859,7 @@ int main(int argc, const char **argv)
 
 	url = strbuf_detach(&buf, NULL);
 
-	http_init(remote, url);
+	http_init(remote, url, 0);
 
 	do {
 		if (strbuf_getline(&buf, stdin, '\n') == EOF) {

t/t5540-http-push.sh

@@ -160,7 +160,7 @@ test_expect_success 'PUT and MOVE sends object to URLs with SHA-1 hash suffix' '
 test_http_push_nonff "$HTTPD_DOCUMENT_ROOT_PATH"/test_repo.git \
 	"$ROOT_PATH"/test_repo_clone master
 
-test_expect_failure 'push to password-protected repository (user in URL)' '
+test_expect_success 'push to password-protected repository (user in URL)' '
 	test_commit pw-user &&
 	git push "$HTTPD_URL_USER/auth/dumb/test_repo.git" HEAD &&
 	git rev-parse --verify HEAD >expect &&