squash! remote-curl: unbreak http.extraHeader with custom allocators

remote-curl: unbreak http.extraHeader with custom allocators

In 93b980e (http: use xmalloc with cURL, 2019-08-15), we started to
ask cURL to use `xmalloc()`, and if compiled with nedmalloc, that means
implicitly a different allocator than the system one.

Which means that all of cURL's allocations and releases now _need_ to
use that allocator.

However, the `http_options()` function used `slist_append()` to add any
configured extra HTTP header(s) _before_ asking cURL to use `xmalloc()`,
and `http_cleanup()` would release them _afterwards_, i.e. in the
presence of custom allocators, cURL would attempt to use the wrong
allocator to release the memory.

A naïve attempt at fixing this would move the call to
`curl_global_init()` _before_ the config is parsed (i.e. before that
call to `slist_append()`).

However, that does work, as we _also_ parse the config setting
`http.sslbackend` and if found, call `curl_global_sslset()` which *must*
be called before `curl_global_init()`, for details see:
https://curl.haxx.se/libcurl/c/curl_global_sslset.html

So let's instead make the config parsing entirely independent from
cURL's data structures. Incidentally, this deletes two more lines than
it introduces, which is nice.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

http.c

@@ -150,7 +150,7 @@ static unsigned long empty_auth_useless =
 
 static struct curl_slist *pragma_header;
 static struct curl_slist *no_pragma_header;
-static struct curl_slist *extra_http_headers;
+static struct string_list extra_http_headers = STRING_LIST_INIT_DUP;
 
 static struct active_request_slot *active_queue_head;
 
@@ -414,11 +414,9 @@ static int http_options(const char *var, const char *value, void *cb)
 		if (!value) {
 			return config_error_nonbool(var);
 		} else if (!*value) {
-			curl_slist_free_all(extra_http_headers);
-			extra_http_headers = NULL;
+			string_list_clear(&extra_http_headers, 0);
 		} else {
-			extra_http_headers =
-				curl_slist_append(extra_http_headers, value);
+			string_list_append(&extra_http_headers, value);
 		}
 		return 0;
 	}
@@ -1064,9 +1062,6 @@ void http_init(struct remote *remote, const char *url, int proactive_auth)
 	char *normalized_url;
 	struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 
-	if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
-		die("curl_global_init failed");
-
 	config.section = "http";
 	config.key = NULL;
 	config.collect_fn = http_options;
@@ -1107,6 +1102,9 @@ void http_init(struct remote *remote, const char *url, int proactive_auth)
 	}
 #endif
 
+	if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
+		die("curl_global_init failed");
+
 	http_proactive_auth = proactive_auth;
 
 	if (remote && remote->http_proxy)
@@ -1202,8 +1200,7 @@ void http_cleanup(void)
 #endif
 	curl_global_cleanup();
 
-	curl_slist_free_all(extra_http_headers);
-	extra_http_headers = NULL;
+	string_list_clear(&extra_http_headers, 0);
 
 	curl_slist_free_all(pragma_header);
 	pragma_header = NULL;
@@ -1627,10 +1624,11 @@ int run_one_slot(struct active_request_slot *slot,
 
 struct curl_slist *http_copy_default_headers(void)
 {
-	struct curl_slist *headers = NULL, *h;
+	struct curl_slist *headers = NULL;
+	const struct string_list_item *item;
 
-	for (h = extra_http_headers; h; h = h->next)
-		headers = curl_slist_append(headers, h->data);
+	for_each_string_list_item(item, &extra_http_headers)
+		headers = curl_slist_append(headers, item->string);
 
 	return headers;
 }