From 9b249227220ea01c3ae40b4e3491f031a5307194 Mon Sep 17 00:00:00 2001
From: Thijs Schreijer <thijs@thijsschreijer.nl>
Date: Sat, 14 Nov 2015 17:33:32 +0100
Subject: write config directory only if explictly given, use defaults
 otherwise

---
 install.bat          | 7 ++++++-
 src/luarocks/cfg.lua | 2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/install.bat b/install.bat
index 42b01c43..f64d6783 100644
--- a/install.bat
+++ b/install.bat
@@ -8,6 +8,7 @@ local vars = {}
 vars.PREFIX = nil
 vars.VERSION = "2.2"
 vars.SYSCONFDIR = nil
+vars.SYSCONFFORCE = nil
 vars.CONFBACKUPDIR = nil
 vars.SYSCONFFILENAME = nil
 vars.CONFIG_FILE = nil
@@ -199,6 +200,7 @@ local function parse_options(args)
 			vars.PREFIX = option.value
 		elseif name == "/CONFIG" then
 			vars.SYSCONFDIR = option.value
+			vars.SYSCONFFORCE = true
 		elseif name == "/TREE" then
 			vars.TREE_ROOT = option.value
 		elseif name == "/SCRIPTS" then
@@ -650,6 +652,7 @@ vars.SYSCONFFILENAME = S"config-$LUA_VERSION.lua"
 vars.CONFIG_FILE = vars.SYSCONFDIR.."\\"..vars.SYSCONFFILENAME
 if SELFCONTAINED then
 	vars.SYSCONFDIR = vars.PREFIX
+	vars.SYSCONFFORCE = true
 	vars.TREE_ROOT = vars.PREFIX..[[\systree]]
 	REGISTRY = false
 end
@@ -835,7 +838,6 @@ else
 end
 f:write(S[=[
 site_config.LUAROCKS_UNAME_M=[[$UNAME_M]]
-site_config.LUAROCKS_SYSCONFIG=[[$CONFIG_FILE]]
 site_config.LUAROCKS_ROCKS_TREE=[[$TREE_ROOT]]
 site_config.LUAROCKS_PREFIX=[[$PREFIX]]
 site_config.LUAROCKS_DOWNLOADER=[[wget]]
@@ -844,6 +846,9 @@ site_config.LUAROCKS_MD5CHECKER=[[md5sum]]
 if FORCE_CONFIG then
 	f:write("site_config.LUAROCKS_FORCE_CONFIG=true\n")
 end
+if vars.SYSCONFFORCE then  -- only write this value when explcitly given, otherwise rely on defaults
+	f:write("site_config.LUAROCKS_SYSCONFIG=[[$CONFIG_FILE]]\n")
+end
 f:write("return site_config\n")
 f:close()
 print(S([[Created LuaRocks site-config file: $LUADIR\luarocks\]]..site_config..[[.lua]]))
diff --git a/src/luarocks/cfg.lua b/src/luarocks/cfg.lua
index e3d6e74b..79b399f0 100644
--- a/src/luarocks/cfg.lua
+++ b/src/luarocks/cfg.lua
@@ -149,7 +149,7 @@ local sys_config_file_default, home_config_file_default
 local sys_config_dir, home_config_dir
 local sys_config_ok, home_config_ok = false, false
 local extra_luarocks_module_dir
-sys_config_dir = site_config.LUAROCKS_SYSCONFDIR
+sys_config_dir = site_config.LUAROCKS_SYSCONFDIR or site_config.LUAROCKS_PREFIX
 if cfg.platforms.windows then
    cfg.home = os.getenv("APPDATA") or "c:"
    sys_config_dir = sys_config_dir or "c:/luarocks"
-- 
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