6 files changed, 26 insertions, 10 deletions

diff --git a/src/luarocks/build.lua b/src/luarocks/build.lua
index 5555d94a..cee65781 100644
--- a/src/luarocks/build.lua
+++ b/src/luarocks/build.lua
@@ -364,7 +364,7 @@ function run(...)
       return pack.pack_binary_rock(name, version, do_build, name, version, deps.get_deps_mode(flags))
    else
       local ok, err = fs.check_command_permissions(flags)
-      if not ok then return nil, err end
+      if not ok then return nil, err, cfg.errorcodes.PERMISSIONDENIED end
       ok, err = do_build(name, version, deps.get_deps_mode(flags))
       if not ok then return nil, err end
       local name, version = ok, err
diff --git a/src/luarocks/cfg.lua b/src/luarocks/cfg.lua
index 2904146b..87777b86 100644
--- a/src/luarocks/cfg.lua
+++ b/src/luarocks/cfg.lua
@@ -35,6 +35,21 @@ major_version = program_version:match("([^.]%.[^.])")
 
 local persist = require("luarocks.persist")
 
+_M.errorcodes = setmetatable({
+   OK = 0,
+   UNSPECIFIED = 1,
+   PERMISSIONDENIED = 2,
+},{
+   __index = function(t, key)
+      local val = rawget(t, key)
+      if not val then
+         error("'"..tostring(key).."' is not a valid errorcode", 2)
+      end
+      return val
+   end
+})
+
+
 local popen_ok, popen_result = pcall(io.popen, "")
 if popen_ok then
    if popen_result then
@@ -43,7 +58,7 @@ if popen_ok then
 else
    io.stderr:write("Your version of Lua does not support io.popen,\n")
    io.stderr:write("which is required by LuaRocks. Please check your Lua installation.\n")
-   os.exit(1)
+   os.exit(_M.errorcodes.UNSPECIFIED)
 end
 
 -- System detection:
diff --git a/src/luarocks/command_line.lua b/src/luarocks/command_line.lua
index b98084e0..e79b1442 100644
--- a/src/luarocks/command_line.lua
+++ b/src/luarocks/command_line.lua
@@ -12,7 +12,8 @@ local program = util.this_program("luarocks")
 
 --- Display an error message and exit.
 -- @param message string: The error message.
-local function die(message)
+-- @param exitcode number: the exitcode to use
+local function die(message, exitcode)
    assert(type(message) == "string")
 
    local ok, err = pcall(util.run_scheduled_functions)
@@ -20,7 +21,7 @@ local function die(message)
       util.printerr("\nLuaRocks "..cfg.program_version.." internal bug (please report at luarocks-developers@lists.sourceforge.net):\n"..err)
    end
    util.printerr("\nError: "..message)
-   os.exit(1)
+   os.exit(exitcode or cfg.errorcodes.UNSPECIFIED)
 end
 
 local function replace_tree(flags, args, tree)
@@ -83,7 +84,7 @@ function run_command(...)
       util.printout(program.." "..cfg.program_version)
       util.printout(program_description)
       util.printout()
-      os.exit(0)
+      os.exit(cfg.errorcodes.OK)
    elseif flags["help"] or #nonflags == 0 then
       command = "help"
       args = nonflags
@@ -184,13 +185,13 @@ function run_command(...)
       -- I'm not changing this now to avoid messing with the run()
       -- interface, which I know some people use (even though
       -- I never published it as a public API...)
-      local xp, ok, err = xpcall(function() return commands[command].run(unpack(args)) end, function(err)
+      local xp, ok, err, exitcode = xpcall(function() return commands[command].run(unpack(args)) end, function(err)
          die(debug.traceback("LuaRocks "..cfg.program_version
             .." bug (please report at luarocks-developers@lists.sourceforge.net).\n"
             ..err, 2))
       end)
       if xp and (not ok) then
-         die(err)
+         die(err, exitcode)
       end
    else
       die("Unknown command: "..command)
diff --git a/src/luarocks/install.lua b/src/luarocks/install.lua
index c181d612..041d8ca2 100644
--- a/src/luarocks/install.lua
+++ b/src/luarocks/install.lua
@@ -129,7 +129,7 @@ function run(...)
    end
 
    local ok, err = fs.check_command_permissions(flags)
-   if not ok then return nil, err end
+   if not ok then return nil, err, cfg.errorcodes.PERMISSIONDENIED end
 
    if name:match("%.rockspec$") or name:match("%.src%.rock$") then
       util.printout("Using "..name.."... switching to 'build' mode")
diff --git a/src/luarocks/make.lua b/src/luarocks/make.lua
index eef49d0c..aff4f93c 100644
--- a/src/luarocks/make.lua
+++ b/src/luarocks/make.lua
@@ -73,7 +73,7 @@ function run(...)
       return pack.pack_binary_rock(rspec.name, rspec.version, build.build_rockspec, rockspec, false, true, deps.get_deps_mode(flags))
    else
       local ok, err = fs.check_command_permissions(flags)
-      if not ok then return nil, err end
+      if not ok then return nil, err, cfg.errorcodes.PERMISSIONDENIED end
       ok, err = build.build_rockspec(rockspec, false, true, deps.get_deps_mode(flags))
       if not ok then return nil, err end
       local name, version = ok, err
diff --git a/src/luarocks/remove.lua b/src/luarocks/remove.lua
index 5a6e4dc5..9ab6d11f 100644
--- a/src/luarocks/remove.lua
+++ b/src/luarocks/remove.lua
@@ -144,7 +144,7 @@ function run(...)
    local deps_mode = flags["deps-mode"] or cfg.deps_mode
    
    local ok, err = fs.check_command_permissions(flags)
-   if not ok then return nil, err end
+   if not ok then return nil, err, cfg.errorcodes.PERMISSIONDENIED end
    
    local rock_type = name:match("%.(rock)$") or name:match("%.(rockspec)$")
    local filename = name