remote: simplify remote_is_configured()

The remote_is_configured() function allows checking whether a remote
exists or not.  The function however only works if remote_get() wasn't
called before calling it.  In addition, it only checks the configuration
for remotes, but not remotes or branches files.

Make use of the origin member of struct remote instead, which indicates
where the remote comes from.  It will be set to some value if the remote
is configured in any file in the repository, but is initialized to 0 if
the remote is only created in make_remote().

Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/fetch.c b/builtin/fetch.c
index 8e74213..8121830 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -1016,10 +1016,9 @@
 
 	git_config(get_remote_group, &g);
 	if (list->nr == prev_nr) {
-		struct remote *remote;
-		if (!remote_is_configured(name))
+		struct remote *remote = remote_get(name);
+		if (!remote_is_configured(remote))
 			return 0;
-		remote = remote_get(name);
 		string_list_append(list, remote->name);
 	}
 	return 1;
diff --git a/builtin/remote.c b/builtin/remote.c
index 2b2ff9b..d966262 100644
--- a/builtin/remote.c
+++ b/builtin/remote.c
@@ -1441,9 +1441,9 @@
 
 	strbuf_addf(&key, "remote.%s.fetch", remotename);
 
-	if (!remote_is_configured(remotename))
-		die(_("No such remote '%s'"), remotename);
 	remote = remote_get(remotename);
+	if (!remote_is_configured(remote))
+		die(_("No such remote '%s'"), remotename);
 
 	if (!add_mode && remove_all_fetch_refspecs(remotename, key.buf)) {
 		strbuf_release(&key);
@@ -1498,9 +1498,9 @@
 
 	remotename = argv[0];
 
-	if (!remote_is_configured(remotename))
-		die(_("No such remote '%s'"), remotename);
 	remote = remote_get(remotename);
+	if (!remote_is_configured(remote))
+		die(_("No such remote '%s'"), remotename);
 
 	url_nr = 0;
 	if (push_mode) {
@@ -1566,9 +1566,9 @@
 	if (delete_mode)
 		oldurl = newurl;
 
-	if (!remote_is_configured(remotename))
-		die(_("No such remote '%s'"), remotename);
 	remote = remote_get(remotename);
+	if (!remote_is_configured(remote))
+		die(_("No such remote '%s'"), remotename);
 
 	if (push_mode) {
 		strbuf_addf(&name_buf, "remote.%s.pushurl", remotename);
diff --git a/remote.c b/remote.c
index 011c9fb..e4a647c 100644
--- a/remote.c
+++ b/remote.c
@@ -713,18 +713,9 @@
 	return remote_get_1(name, pushremote_for_branch);
 }
 
-int remote_is_configured(const char *name)
+int remote_is_configured(struct remote *remote)
 {
-	struct remotes_hash_key lookup;
-	struct hashmap_entry lookup_entry;
-	read_config();
-
-	init_remotes_hash();
-	lookup.str = name;
-	lookup.len = strlen(name);
-	hashmap_entry_init(&lookup_entry, memhash(name, lookup.len));
-
-	return hashmap_get(&remotes_hash, &lookup_entry, &lookup) != NULL;
+	return remote && remote->origin;
 }
 
 int for_each_remote(each_remote_fn fn, void *priv)
diff --git a/remote.h b/remote.h
index 4fd7a0f..c21fd37 100644
--- a/remote.h
+++ b/remote.h
@@ -5,6 +5,7 @@
 #include "hashmap.h"
 
 enum {
+	REMOTE_UNCONFIGURED = 0,
 	REMOTE_CONFIG,
 	REMOTE_REMOTES,
 	REMOTE_BRANCHES
@@ -59,7 +60,7 @@
 
 struct remote *remote_get(const char *name);
 struct remote *pushremote_get(const char *name);
-int remote_is_configured(const char *name);
+int remote_is_configured(struct remote *remote);
 
 typedef int each_remote_fn(struct remote *remote, void *priv);
 int for_each_remote(each_remote_fn fn, void *priv);