remote-curl: store url as a strbuf

We use a strbuf to generate the string containing the remote
URL, but then detach it to a bare pointer. This makes it
harder to later manipulate the URL, as we have forgotten the
length (and the allocation semantics are not as clear).

Let's instead keep the strbuf around. As a bonus, this
eliminates a confusing double-use of the "buf" strbuf in
main(). Prior to this, it was used both for constructing the
url, and for reading commands from stdin.

The downside is that we have to update each call site to
refer to "url.buf" rather than just "url" when they want the
C string.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>

remote-curl.c

@@ -11,7 +11,8 @@
 #include "credential.h"
 
 static struct remote *remote;
-static const char *url; /* always ends with a trailing slash */
+/* always ends with a trailing slash */
+static struct strbuf url = STRBUF_INIT;
 
 struct options {
 	int verbosity;
@@ -112,7 +113,8 @@ static struct ref *parse_info_refs(struct discovery *heads)
 			mid = &data[i];
 		if (data[i] == '\n') {
 			if (mid - start != 40)
-				die("%sinfo/refs not valid: is this a git repository?", url);
+				die("%sinfo/refs not valid: is this a git repository?",
+				    url.buf);
 			data[i] = 0;
 			ref_name = mid + 1;
 			ref = xmalloc(sizeof(struct ref) +
@@ -131,7 +133,7 @@ static struct ref *parse_info_refs(struct discovery *heads)
 	}
 
 	ref = alloc_ref("HEAD");
-	if (!http_fetch_ref(url, ref) &&
+	if (!http_fetch_ref(url.buf, ref) &&
 	    !resolve_remote_symref(ref, refs)) {
 		ref->next = refs;
 		refs = ref;
@@ -194,11 +196,11 @@ static struct discovery* discover_refs(const char *service, int for_push)
 		return last;
 	free_discovery(last);
 
-	strbuf_addf(&refs_url, "%sinfo/refs", url);
-	if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
+	strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
+	if ((!prefixcmp(url.buf, "http://") || !prefixcmp(url.buf, "https://")) &&
 	     git_env_bool("GIT_SMART_HTTP", 1)) {
 		maybe_smart = 1;
-		if (!strchr(url, '?'))
+		if (!strchr(url.buf, '?'))
 			strbuf_addch(&refs_url, '?');
 		else
 			strbuf_addch(&refs_url, '&');
@@ -216,13 +218,13 @@ static struct discovery* discover_refs(const char *service, int for_push)
 		break;
 	case HTTP_MISSING_TARGET:
 		show_http_message(&type, &buffer);
-		die("repository '%s' not found", url);
+		die("repository '%s' not found", url.buf);
 	case HTTP_NOAUTH:
 		show_http_message(&type, &buffer);
-		die("Authentication failed for '%s'", url);
+		die("Authentication failed for '%s'", url.buf);
 	default:
 		show_http_message(&type, &buffer);
-		die("unable to access '%s': %s", url, curl_errorstr);
+		die("unable to access '%s': %s", url.buf, curl_errorstr);
 	}
 
 	last= xcalloc(1, sizeof(*last_discovery));
@@ -588,7 +590,7 @@ static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 	rpc->out = client.out;
 	strbuf_init(&rpc->result, 0);
 
-	strbuf_addf(&buf, "%s%s", url, svc);
+	strbuf_addf(&buf, "%s%s", url.buf, svc);
 	rpc->service_url = strbuf_detach(&buf, NULL);
 
 	strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
@@ -640,7 +642,7 @@ static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 	for (i = 0; i < nr_heads; i++)
 		targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 
-	walker = get_http_walker(url);
+	walker = get_http_walker(url.buf);
 	walker->get_all = 1;
 	walker->get_tree = 1;
 	walker->get_history = 1;
@@ -685,7 +687,7 @@ static int fetch_git(struct discovery *heads,
 		depth_arg = strbuf_detach(&buf, NULL);
 		argv[argc++] = depth_arg;
 	}
-	argv[argc++] = url;
+	argv[argc++] = url.buf;
 	argv[argc++] = NULL;
 
 	for (i = 0; i < nr_heads; i++) {
@@ -783,7 +785,7 @@ static int push_dav(int nr_spec, char **specs)
 		argv[argc++] = "--dry-run";
 	if (options.verbosity > 1)
 		argv[argc++] = "--verbose";
-	argv[argc++] = url;
+	argv[argc++] = url.buf;
 	for (i = 0; i < nr_spec; i++)
 		argv[argc++] = specs[i];
 	argv[argc++] = NULL;
@@ -813,7 +815,7 @@ static int push_git(struct discovery *heads, int nr_spec, char **specs)
 	else if (options.verbosity > 1)
 		argv_array_push(&args, "--verbose");
 	argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
-	argv_array_push(&args, url);
+	argv_array_push(&args, url.buf);
 	for (i = 0; i < nr_spec; i++)
 		argv_array_push(&args, specs[i]);
 
@@ -894,14 +896,12 @@ int main(int argc, const char **argv)
 	remote = remote_get(argv[1]);
 
 	if (argc > 2) {
-		end_url_with_slash(&buf, argv[2]);
+		end_url_with_slash(&url, argv[2]);
 	} else {
-		end_url_with_slash(&buf, remote->url[0]);
+		end_url_with_slash(&url, remote->url[0]);
 	}
 
-	url = strbuf_detach(&buf, NULL);
-
-	http_init(remote, url, 0);
+	http_init(remote, url.buf, 0);
 
 	do {
 		if (strbuf_getline(&buf, stdin, '\n') == EOF) {