Give sensible feedback when a repo has no configured servers

This fixes FS#14899. When running an -Sp operation without servers
configured for a repository, we would segfault, so add an assert to the
backend method returning the first server preventing a null pointer
dereference.

In addition, add a new error code to libalpm that indicates we have no
servers configured for a repository. This makes -Sy and -S <package>
operations fail gracefully and helpfully when a repo is set up with no
servers, as the default mirrorlist in Arch is provided this way.

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/libalpm/error.c b/lib/libalpm/error.c
index fdff9ed4..47e254e6 100644
--- a/lib/libalpm/error.c
+++ b/lib/libalpm/error.c
@@ -84,6 +84,8 @@ const char SYMEXPORT *alpm_strerror(int err)
 		/* Servers */
 		case PM_ERR_SERVER_BAD_URL:
 			return _("invalid url for server");
+		case PM_ERR_SERVER_NONE:
+			return _("no servers configured for repository");
 		/* Transactions */
 		case PM_ERR_TRANS_NOT_NULL:
 			return _("transaction already initialized");