2 files changed, 19 insertions, 6 deletions

diff --git a/src/luarocks/command_line.lua b/src/luarocks/command_line.lua
index d16ef8e2..63b918b5 100644
--- a/src/luarocks/command_line.lua
+++ b/src/luarocks/command_line.lua
@@ -98,9 +98,22 @@ function run_command(...)
       if flags["tree"] == true or flags["tree"] == "" then
          die("Argument error: use --tree=<path>")
       end
-      local fs = require("luarocks.fs")
-      local root_dir = fs.absolute_name(flags["tree"])
-      path.use_tree(root_dir)
+      local named = false
+      for _, tree in ipairs(cfg.rocks_trees) do
+         if type(tree) == "table" and flags["tree"] == tree.name then
+            if not tree.root then
+               die("Configuration error: tree '"..tree.name.."' has no 'root' field.")
+            end
+            path.use_tree(dir.normalize(tree.root))
+            named = true
+            break
+         end
+      end
+      if not named then
+         local fs = require("luarocks.fs")
+         local root_dir = fs.absolute_name(flags["tree"])
+         path.use_tree(root_dir)
+      end
    elseif flags["local"] then
       path.use_tree(cfg.home_tree)
    else
diff --git a/test/testing.sh b/test/testing.sh
index 0fa40e53..d3ab3308 100755
--- a/test/testing.sh
+++ b/test/testing.sh
@@ -59,7 +59,7 @@ mkdir -p "$testing_cache"
 cat <<EOF > $testing_dir/testing_config.lua
 rocks_trees = {
    "$testing_tree",
-   "$testing_sys_tree",
+   { name = "system", root = "$testing_sys_tree" },
 }
 rocks_servers = {
    "$testing_server"
@@ -398,8 +398,8 @@ test_admin_remove() { if [ "$travis" ]; then return; fi; $luarocks_admin --serve
 fail_admin_remove_missing() { $luarocks_admin --server=testing remove; }
 
 fail_deps_mode_invalid_arg() { $luarocks remove luacov --deps-mode; }
-test_deps_mode_one() { $luarocks build --tree="$testing_sys_tree" lpeg && $luarocks list && $luarocks build --deps-mode=one --tree="$testing_tree" lxsh && [ `$luarocks_noecho list --tree="$testing_tree" --porcelain lpeg | wc -l` = 1 ]; }
-test_deps_mode_order() { $luarocks build --tree="$testing_sys_tree" lpeg && $luarocks build --deps-mode=order --tree="$testing_tree" lxsh && [ `$luarocks_noecho list --tree="$testing_tree" --porcelain lpeg | wc -l` = 0 ]; }
+test_deps_mode_one() { $luarocks build --tree="system" lpeg && $luarocks list && $luarocks build --deps-mode=one --tree="$testing_tree" lxsh && [ `$luarocks_noecho list --tree="$testing_tree" --porcelain lpeg | wc -l` = 1 ]; }
+test_deps_mode_order() { $luarocks build --tree="system" lpeg && $luarocks build --deps-mode=order --tree="$testing_tree" lxsh && [ `$luarocks_noecho list --tree="$testing_tree" --porcelain lpeg | wc -l` = 0 ]; }
 test_deps_mode_order_sys() { $luarocks build --tree="$testing_tree" lpeg && $luarocks build --deps-mode=order --tree="$testing_sys_tree" lxsh && [ `$luarocks_noecho list --tree="$testing_sys_tree" --porcelain lpeg | wc -l` = 1 ]; }
 test_deps_mode_all_sys() { $luarocks build --tree="$testing_tree" lpeg && $luarocks build --deps-mode=all --tree="$testing_sys_tree" lxsh && [ `$luarocks_noecho list --tree="$testing_sys_tree" --porcelain lpeg | wc -l` = 0 ]; }
 test_deps_mode_none() { $luarocks build --tree="$testing_tree" --deps-mode=none lxsh; [ `$luarocks_noecho list --tree="$testing_tree" --porcelain lpeg | wc -l` = 0 ]; }