Avoid double slashes in URLs given to libdownload.

If a Server specified in pacman.conf had a trailing slash, libalpm ended up
building URLs with double slashes, and this broke libdownload with errors
like the following one :

error: failed retrieving file 'redland-1.0.8-1-i686.pkg.tar.gz'
from 192.168.0.90 : Command okay

So the public function alpm_db_set_server will make sure to remove the
trailing slash of servers.  For the private function
_alpm_download_single_file, I only added a comment.

Signed-off-by: Xavier Chantry <shiningxc@gmail.com>
Signed-off-by: Dan McGee <dan@archlinux.org>

2 files changed, 14 insertions, 3 deletions

diff --git a/lib/libalpm/db.c b/lib/libalpm/db.c
index 83db429d..d9a3931e 100644
--- a/lib/libalpm/db.c
+++ b/lib/libalpm/db.c
@@ -170,6 +170,8 @@ int SYMEXPORT alpm_db_setserver(pmdb_t *db, const char *url)
 {
 	alpm_list_t *i;
 	int found = 0;
+	char *newurl;
+	int len = 0;
 
 	ALPM_LOG_FUNC;
 
@@ -186,10 +188,18 @@ int SYMEXPORT alpm_db_setserver(pmdb_t *db, const char *url)
 		RET_ERR(PM_ERR_DB_NOT_FOUND, -1);
 	}
 
-	if(url && strlen(url)) {
-		db->servers = alpm_list_add(db->servers, strdup(url));
+	if(url) {
+		len = strlen(url);
+	}
+	if(len) {
+		newurl = strdup(url);
+		/* strip the trailing slash if one exists */
+		if(newurl[len - 1] == '/') {
+			newurl[len - 1] = '\0';
+		}
+		db->servers = alpm_list_add(db->servers, newurl);
 		_alpm_log(PM_LOG_DEBUG, "adding new server URL to database '%s': %s\n",
-				db->treename, url);
+				db->treename, newurl);
 	} else {
 		FREELIST(db->servers);
 		_alpm_log(PM_LOG_DEBUG, "serverlist flushed for '%s'\n", db->treename);
diff --git a/lib/libalpm/dload.c b/lib/libalpm/dload.c
index ef12646e..c07040b5 100644
--- a/lib/libalpm/dload.c
+++ b/lib/libalpm/dload.c
@@ -365,6 +365,7 @@ static int download(const char *url, const char *localpath,
  *     than mtimeold.
  *   - if *mtimenew is non-NULL, it will be filled with the mtime of the remote
  *     file.
+ *   - servers must be a list of urls WITHOUT trailing slashes.
  *
  * RETURN:  0 for successful download
  *          1 if the mtimes are identical