From 7b730490ade3690d1b39bbb9f5c51c4cead974ed Mon Sep 17 00:00:00 2001
From: Hisham Muhammad <hisham@gobolinux.org>
Date: Thu, 25 Jul 2019 15:48:08 -0300
Subject: fs: fix initialization of platform-specific fallbacks

---
 src/luarocks/core/cfg.lua | 15 ++++++++++++---
 src/luarocks/fs.lua       | 33 ++++++++++++++++-----------------
 2 files changed, 28 insertions(+), 20 deletions(-)

diff --git a/src/luarocks/core/cfg.lua b/src/luarocks/core/cfg.lua
index 0505b11d..a1ebe4e4 100644
--- a/src/luarocks/core/cfg.lua
+++ b/src/luarocks/core/cfg.lua
@@ -806,12 +806,21 @@ function cfg.init(detected, warning)
       return platforms[name]
    end
 
-   function cfg.each_platform()
-      local i = 0
+   -- @param direction (optional) "least-specific-first" (default) or "most-specific-first"
+   function cfg.each_platform(direction)
+      direction = direction or "least-specific-first"
+      local i, delta
+      if direction == "least-specific-first" then
+         i = 0
+         delta = 1
+      else
+         i = #platform_order + 1
+         delta = -1
+      end
       return function()
          local p
          repeat
-            i = i + 1
+            i = i + delta
             p = platform_order[i]
          until (not p) or platforms[p]
          return p
diff --git a/src/luarocks/fs.lua b/src/luarocks/fs.lua
index 849ee4d3..f3c474eb 100644
--- a/src/luarocks/fs.lua
+++ b/src/luarocks/fs.lua
@@ -51,7 +51,7 @@ end
 do
    local function load_fns(fs_table, inits)
       for name, fn in pairs(fs_table) do
-         if not fs[name] then
+         if name ~= "init" and not fs[name] then
             fs[name] = fn
          end
       end
@@ -60,6 +60,15 @@ do
       end
    end
 
+   local function load_platform_fns(patt, inits)
+      for platform in cfg.each_platform("most-specific-first") do
+         local ok, fs_plat = pcall(require, patt:format(platform))
+         if ok and fs_plat then
+            load_fns(fs_plat, inits)
+         end
+      end
+   end
+
    function fs.init()
       if fs.current_dir then
          -- already initialized
@@ -73,26 +82,16 @@ do
       local inits = {}
 
       -- Load platform-specific functions
-      local loaded_platform = nil
-      for platform in cfg.each_platform() do
-         local ok, fs_plat = pcall(require, "luarocks.fs."..platform)
-         if ok and fs_plat then
-            loaded_platform = platform
-            load_fns(fs_plat, inits)
-            break
-         end
-      end
+      load_platform_fns("luarocks.fs.%s", inits)
 
       -- Load platform-independent pure-Lua functionality
-      local fs_lua = require("luarocks.fs.lua")
-      load_fns(fs_lua, inits)
+      load_fns(require("luarocks.fs.lua"), inits)
 
       -- Load platform-specific fallbacks for missing Lua modules
-      local ok, fs_plat_tools = pcall(require, "luarocks.fs."..loaded_platform..".tools")
-      if ok and fs_plat_tools then
-         load_fns(fs_plat_tools, inits)
-         load_fns(require("luarocks.fs.tools"))
-      end
+      load_platform_fns("luarocks.fs.%s.tools", inits)
+
+      -- Load platform-independent external tool functionality
+      load_fns(require("luarocks.fs.tools"), inits)
 
       -- Run platform-specific initializations after everything is loaded
       for _, init in ipairs(inits) do
-- 
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