2 files changed, 13 insertions, 1 deletions

diff --git a/src/luarocks/command_line.lua b/src/luarocks/command_line.lua
index 19d04290..f9fba300 100644
--- a/src/luarocks/command_line.lua
+++ b/src/luarocks/command_line.lua
@@ -113,6 +113,13 @@ function run_command(...)
       die("Invalid entry for --deps-mode.")
    end
    
+   if flags["branch"] then
+     if flags["branch"] == true or flags["branch"] == "" then
+       die("Argument error: use --branch=<branch-name>")
+     end
+     cfg.branch = flags["branch"]
+   end
+   
    if flags["tree"] then
       if flags["tree"] == true or flags["tree"] == "" then
          die("Argument error: use --tree=<path>")
diff --git a/src/luarocks/fetch.lua b/src/luarocks/fetch.lua
index 7960acb4..e0525dde 100644
--- a/src/luarocks/fetch.lua
+++ b/src/luarocks/fetch.lua
@@ -144,10 +144,15 @@ end
 function load_local_rockspec(filename, quick)
    assert(type(filename) == "string")
    filename = fs.absolute_name(filename)
-   local rockspec, err = persist.load_into_table(filename)
+   local rockspec, err = persist.load_into_table(filename, {BRANCH = cfg.branch})  -- temp add BRANCH
    if not rockspec then
       return nil, "Could not load rockspec file "..filename.." ("..err..")"
    end
+   if rockspec.BRANCH ~= cfg.branch then
+      return nil, "Invalid rockspec, BRANCH constant was illegally modified by rockspec"
+   else
+      rockspec.BRANCH = nil   -- remove temporary added field
+   end
    local globals = err
 
    local ok, err = true, nil