Don't crash on invalid config files.

Report which config file is being loaded at luarocks --help.
Thanks to Tomas Guisasola Gorham for the suggestions.

3 files changed, 27 insertions, 4 deletions

diff --git a/src/luarocks/cfg.lua b/src/luarocks/cfg.lua
index 8a783237..9fce84f8 100644
--- a/src/luarocks/cfg.lua
+++ b/src/luarocks/cfg.lua
@@ -91,6 +91,7 @@ end
 -- Path configuration:
 
 local sys_config_file, home_config_file
+local sys_config_ok, home_config_ok = false, false
 if detected.windows or detected.mingw32 then
    home = os.getenv("APPDATA") or "c:"
    sys_config_file = "c:/luarocks/config.lua"
@@ -106,12 +107,18 @@ end
 variables = {}
 rocks_trees = {}
 
-persist.load_into_table(site_config.LUAROCKS_SYSCONFIG or sys_config_file, _M)
+local ok, err = persist.load_into_table(site_config.LUAROCKS_SYSCONFIG or sys_config_file, _M)
+if ok then
+   sys_config_ok = true
+elseif err and ok == nil then
+   io.stderr:write(err.."\n")
+end
 
 if not site_config.LUAROCKS_FORCE_CONFIG then
    home_config_file = os.getenv("LUAROCKS_CONFIG") or home_config_file
-   local home_overrides = persist.load_into_table(home_config_file, { home = home })
+   local home_overrides, err = persist.load_into_table(home_config_file, { home = home })
    if home_overrides then
+      home_config_ok = true
       local util = require("luarocks.util")
       if home_overrides.rocks_trees then
          _M.rocks_trees = nil
@@ -120,6 +127,8 @@ if not site_config.LUAROCKS_FORCE_CONFIG then
          _M.rocks_servers = nil
       end
       util.deep_merge(_M, home_overrides)
+   elseif err and home_overrides == nil then
+      io.stderr:write(err.."\n")
    end
 end
 
@@ -404,6 +413,10 @@ for _,tree in ipairs(rocks_trees) do
   end
 end
 
+function which_config()
+   return sys_config_file, sys_config_ok, home_config_file, home_config_ok
+end
+
 --- Check if platform was detected
 -- @param query string: The platform name to check.
 -- @return boolean: true if LuaRocks is currently running on queried platform.
diff --git a/src/luarocks/help.lua b/src/luarocks/help.lua
index 718580ce..6272d213 100644
--- a/src/luarocks/help.lua
+++ b/src/luarocks/help.lua
@@ -25,9 +25,13 @@ function run(...)
    local flags, command = util.parse_flags(...)
 
    if not command then
+      local sys_file, sys_ok, home_file, home_ok = cfg.which_config()
       util.printout([[
 LuaRocks ]]..cfg.program_version..[[, a module deployment system for Lua
 
+Using system configuration file: ]]..sys_file .. " (" .. (sys_ok and "ok" or "failed") ..[[)
+and user configuration file: ]]..home_file .. " (" .. (home_ok and "ok" or "failed") ..[[)
+
 ]]..program_name..[[ - ]]..program_description..[[
 
 usage: ]]..program_name..[[ [--from=<server> | --only-from=<server>] [--to=<tree>] [VAR=VALUE]... <command> [<argument>]
diff --git a/src/luarocks/persist.lua b/src/luarocks/persist.lua
index 91c28a32..6d411e0f 100644
--- a/src/luarocks/persist.lua
+++ b/src/luarocks/persist.lua
@@ -20,11 +20,17 @@ function load_into_table(filename, tbl)
 
    local chunk, err = loadfile(filename)
    if not chunk then
-      return nil, err
+      if err:sub(1,5) ~= filename:sub(1,5) then
+         return false, err
+      end
+      return nil, "Error loading file: "..err
    end
    local result = tbl or {}
    setfenv(chunk, result)
-   chunk()
+   local ok, err = pcall(chunk)
+   if not ok then
+      return nil, "Error running file: "..err
+   end
    return result
 end