cache: implement valid_server() to verify that a server is configured

Signed-off-by: Gordon Hecker <gh@emlix.com>

diff --git a/generic/cache.lua b/generic/cache.lua
index 6dbc7a8c8b6330b4bfc3cf8d35852a1dfc7df361..768a7f827f070aef2e5f753075319f57640f5b21 100644 (file)
--- a/generic/cache.lua
+++ b/generic/cache.lua
@@ -170,6 +170,14 @@ function ce_by_server(cache, server)
        return nil, new_error("no cache entry for server: %s", server)
 end
 
+function valid_server(cache, server)
+       if ce_by_server(cache, server) then
+               return true
+       else
+               return false, new_error("not a valid server: %s", server)
+       end
+end
+
 --- get remote url
 -- for use in scm implementations where urls need to be handled manually
 -- @param cache the cache table