6 files changed, 79 insertions, 34 deletions

diff --git a/src/luarocks/cfg.lua b/src/luarocks/cfg.lua
index 6706468c..af30417c 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"
@@ -665,7 +665,7 @@ function cfg.init_package_paths()
 end
 
 function cfg.which_config()
-   return {
+   local ret = {
       system = {
          file = sys_config_file or sys_config_file_default,
          ok = sys_config_ok,
@@ -675,6 +675,8 @@ function cfg.which_config()
          ok = home_config_ok,
       }
    }
+   ret.nearest = (ret.user.ok and ret.user.file) or ret.system.file
+   return ret
 end
 
 cfg.user_agent = "LuaRocks/"..cfg.program_version.." "..cfg.arch
diff --git a/src/luarocks/command_line.lua b/src/luarocks/command_line.lua
index dbf64b9c..e1c9f492 100644
--- a/src/luarocks/command_line.lua
+++ b/src/luarocks/command_line.lua
@@ -31,12 +31,17 @@ end
 local function replace_tree(flags, args, tree)
    tree = dir.normalize(tree)
    flags["tree"] = tree
+   local added = false
    for i = 1, #args do
       if args[i]:match("%-%-tree=") then
          args[i] = "--tree="..tree
+         added = true
          break
       end
    end
+   if not added then
+      args[#args + 1] = "--tree="..tree
+   end
    path.use_tree(tree)
 end
 
diff --git a/src/luarocks/deps.lua b/src/luarocks/deps.lua
index 3f7eb4d2..764116a2 100644
--- a/src/luarocks/deps.lua
+++ b/src/luarocks/deps.lua
@@ -558,10 +558,11 @@ function deps.check_external_deps(rockspec, mode)
       subdirs = cfg.runtime_external_deps_subdirs
    end
    if rockspec.external_dependencies then
-      for name, files in pairs(rockspec.external_dependencies) do
+      for name, ext_files in util.sortedpairs(rockspec.external_dependencies) do
          local ok = true
-         local failed_file = nil
-         local failed_dirname = nil
+         local failed_files = {program = {}, header = {}, library = {}}
+         local failed_dirname
+         local failed_testfile
          for _, extdir in ipairs(cfg.external_deps_dirs) do
             ok = true
             local prefix = vars[name.."_DIR"]
@@ -590,7 +591,7 @@ function deps.check_external_deps(rockspec, mode)
                end
                prefix = prefix.prefix
             end
-            for dirname, dirdata in pairs(dirs) do
+            for dirname, dirdata in util.sortedpairs(dirs) do
                local paths
                local path_var_value = vars[name.."_"..dirname]
                if path_var_value then
@@ -604,7 +605,7 @@ function deps.check_external_deps(rockspec, mode)
                   paths = { dir.path(prefix, dirdata.subdir) }
                end
                dirdata.dir = paths[1]
-               local file = files[dirdata.testfile]
+               local file = ext_files[dirdata.testfile]
                if file then
                   local files = {}
                   if not file:match("%.") then
@@ -619,19 +620,23 @@ function deps.check_external_deps(rockspec, mode)
                      table.insert(files, file)
                   end
                   local found = false
-                  failed_file = nil
-                  for _, f in pairs(files) do
-                  
+                  for _, f in ipairs(files) do
+
                      -- small convenience hack
                      if f:match("%.so$") or f:match("%.dylib$") or f:match("%.dll$") then
                         f = f:gsub("%.[^.]+$", "."..cfg.external_lib_extension)
                      end
-                     
+
+                     local pattern
+                     if f:match("%*") then
+                        pattern = f:gsub("%.", "%%."):gsub("%*", ".*")
+                        f = "matching "..f
+                     end
+
                      for _, d in ipairs(paths) do
-                        if f:match("%*") then
-                           local replaced = f:gsub("%.", "%%."):gsub("%*", ".*")
+                        if pattern then
                            for entry in fs.dir(d) do
-                              if entry:match(replaced) then
+                              if entry:match(pattern) then
                                  found = true
                                  break
                               end
@@ -642,21 +647,18 @@ function deps.check_external_deps(rockspec, mode)
                         if found then
                            dirdata.dir = d
                            break
+                        else
+                           table.insert(failed_files[dirdata.testfile], f.." in "..d)
                         end
                      end
                      if found then
                         break
-                     else
-                        if failed_file then
-                           failed_file = failed_file .. ", or " .. f
-                        else
-                           failed_file = f
-                        end
                      end
                   end
                   if not found then
                      ok = false
                      failed_dirname = dirname
+                     failed_testfile = dirdata.testfile
                      break
                   end
                end
@@ -670,7 +672,20 @@ function deps.check_external_deps(rockspec, mode)
             end
          end
          if not ok then
-            return nil, "Could not find expected file "..failed_file.." for "..name.." -- you may have to install "..name.." in your system and/or pass "..name.."_DIR or "..name.."_"..failed_dirname.." to the luarocks command. Example: luarocks install "..rockspec.name.." "..name.."_DIR=/usr/local", "dependency"
+            local lines = {"Could not find "..failed_testfile.." file for "..name}
+
+            local failed_paths = {}
+            for _, failed_file in ipairs(failed_files[failed_testfile]) do
+               if not failed_paths[failed_file] then
+                  failed_paths[failed_file] = true
+                  table.insert(lines, "  No file "..failed_file)
+               end
+            end
+
+            table.insert(lines, "You may have to install "..name.." in your system and/or pass "..name.."_DIR or "..name.."_"..failed_dirname.." to the luarocks command.")
+            table.insert(lines, "Example: luarocks install "..rockspec.name.." "..name.."_DIR=/usr/local")
+
+            return nil, table.concat(lines, "\n"), "dependency"
          end
       end
    end
diff --git a/src/luarocks/fs/lua.lua b/src/luarocks/fs/lua.lua
index 73ae2698..a444f014 100644
--- a/src/luarocks/fs/lua.lua
+++ b/src/luarocks/fs/lua.lua
@@ -134,10 +134,10 @@ function fs_lua.is_tool_available(tool_cmd, tool_name, arg)
    arg = arg or "--version"
    assert(type(arg) == "string")
 
-   if not fs.execute_quiet(tool_cmd, arg) then
+   if not fs.execute_quiet(fs.Q(tool_cmd), arg) then
       local msg = "'%s' program not found. Make sure %s is installed and is available in your PATH " ..
-                  "(or you may want to edit the 'variables.%s' value in file 'config.lua')"
-      return nil, msg:format(tool_cmd, tool_name, tool_cmd:upper())
+                  "(or you may want to edit the 'variables.%s' value in file '%s')"
+      return nil, msg:format(tool_cmd, tool_name, tool_name:upper(), cfg.which_config().nearest)
    else
       return true
    end
@@ -833,10 +833,19 @@ function fs_lua.check_command_permissions(flags)
          break
       end
    end
-   local root_parent = dir.dir_name(root_dir)
-   if ok and not fs.exists(root_dir) and not fs.is_writable(root_parent) then
-      ok = false
-      err = root_dir.." does not exist and your user does not have write permissions in " .. root_parent
+   if ok and not fs.exists(root_dir) then
+      local root = fs.root_of(root_dir)
+      local parent = root_dir
+      repeat
+         parent = dir.dir_name(parent)
+         if parent == "" then
+            parent = root
+         end
+      until parent == root or fs.exists(parent)
+      if not fs.is_writable(parent) then
+         ok = false
+         err = root_dir.." does not exist and your user does not have write permissions in " .. parent
+      end
    end
    if ok then
       return true
diff --git a/src/luarocks/fs/unix.lua b/src/luarocks/fs/unix.lua
index 6ad5a678..8eb3386a 100644
--- a/src/luarocks/fs/unix.lua
+++ b/src/luarocks/fs/unix.lua
@@ -36,6 +36,14 @@ function unix.absolute_name(pathname, relative_to)
    end
 end
 
+--- Return the root directory for the given path.
+-- In Unix, root is always "/".
+-- @param pathname string: pathname to use.
+-- @return string: The root of the given pathname.
+function unix.root_of(_)
+   return "/"
+end
+
 --- Create a wrapper to make a script executable from the command-line.
 -- @param file string: Pathname of script to be made executable.
 -- @param dest string: Directory where to put the wrapper.
diff --git a/src/luarocks/fs/win32.lua b/src/luarocks/fs/win32.lua
index 32766e53..0c8cc9e9 100644
--- a/src/luarocks/fs/win32.lua
+++ b/src/luarocks/fs/win32.lua
@@ -18,7 +18,6 @@ local _popen, _execute = io.popen, os.execute
 io.popen = function(cmd, ...) return _popen(_prefix..cmd, ...) end
 os.execute = function(cmd, ...) return _execute(_prefix..cmd, ...) end
 
-
 --- Annotate command string for quiet execution.
 -- @param cmd string: A command-line string.
 -- @return string: The command-line, with silencing annotation.
@@ -26,6 +25,7 @@ function win32.quiet(cmd)
    return cmd.." 2> NUL 1> NUL"
 end
 
+local drive_letter = "[%.a-zA-Z]?:?[\\/]"
 
 local win_escape_chars = {
   ["%"] = "%%",
@@ -47,7 +47,7 @@ end
 function win32.Q(arg)
    assert(type(arg) == "string")
    -- Quote DIR for Windows
-   if arg:match("^[%.a-zA-Z]?:?[\\/]")  then
+   if arg:match("^"..drive_letter)  then
       arg = arg:gsub("/", "\\")
    end
    if arg == "\\" then
@@ -68,7 +68,7 @@ end
 function win32.Qb(arg)
    assert(type(arg) == "string")
    -- Quote DIR for Windows
-   if arg:match("^[%.a-zA-Z]?:?[\\/]")  then
+   if arg:match("^"..drive_letter)  then
       arg = arg:gsub("/", "\\")
    end
    if arg == "\\" then
@@ -92,15 +92,21 @@ function win32.absolute_name(pathname, relative_to)
    assert(type(relative_to) == "string" or not relative_to)
 
    relative_to = relative_to or fs.current_dir()
-   -- FIXME I'm not sure this first \\ should be there at all.
-   -- What are the Windows rules for drive letters?
-   if pathname:match("^[\\.a-zA-Z]?:?[\\/]") then
+   if pathname:match("^"..drive_letter) then
       return pathname
    else
       return relative_to .. "/" .. pathname
    end
 end
 
+--- Return the root directory for the given path.
+-- For example, for "c:\hello", returns "c:\"
+-- @param pathname string: pathname to use.
+-- @return string: The root of the given pathname.
+function win32.root_of(pathname)
+   return (fs.absolute_name(pathname):match("^("..drive_letter..")"))
+end
+
 --- Create a wrapper to make a script executable from the command-line.
 -- @param file string: Pathname of script to be made executable.
 -- @param dest string: Directory where to put the wrapper.