16 files changed, 190 insertions, 107 deletions

diff --git a/src/bin/luarocks b/src/bin/luarocks
index 6ab27fa3..72f04c83 100755
--- a/src/bin/luarocks
+++ b/src/bin/luarocks
@@ -5,22 +5,23 @@ local command_line = require("luarocks.command_line")
 
 program_description = "LuaRocks main command-line interface"
 
-commands = {}
-commands.help = require("luarocks.help")
-commands.pack = require("luarocks.pack")
-commands.unpack = require("luarocks.unpack")
-commands.build = require("luarocks.build")
-commands.install = require("luarocks.install")
-commands.search = require("luarocks.search")
-commands.list = require("luarocks.list")
-commands.remove = require("luarocks.remove")
-commands.make = require("luarocks.make")
-commands.download = require("luarocks.download")
-commands.path = require("luarocks.path")
-commands.show = require("luarocks.show")
-commands.new_version = require("luarocks.new_version")
-commands.lint = require("luarocks.lint")
-commands.write_rockspec = require("luarocks.write_rockspec")
-commands.purge = require("luarocks.purge")
+commands = {
+   help = "luarocks.help",
+   pack = "luarocks.pack",
+   unpack = "luarocks.unpack",
+   build = "luarocks.build",
+   install = "luarocks.install",
+   search = "luarocks.search",
+   list = "luarocks.list",
+   remove = "luarocks.remove",
+   make = "luarocks.make",
+   download = "luarocks.download",
+   path = "luarocks.path",
+   show = "luarocks.show",
+   new_version = "luarocks.new_version",
+   lint = "luarocks.lint",
+   write_rockspec = "luarocks.write_rockspec",
+   purge = "luarocks.purge",
+}
 
 command_line.run_command(...)
diff --git a/src/bin/luarocks-admin b/src/bin/luarocks-admin
index 983dda87..e7f49c25 100755
--- a/src/bin/luarocks-admin
+++ b/src/bin/luarocks-admin
@@ -6,12 +6,11 @@ local command_line = require("luarocks.command_line")
 program_description = "LuaRocks repository administration interface"
 
 commands = {
+   help = "luarocks.help",
+   make_manifest = "luarocks.make_manifest",
+   add = "luarocks.add",
+   remove = "luarocks.admin_remove",
+   refresh_cache = "luarocks.refresh_cache",
 }
 
-commands.help = require("luarocks.help")
-commands.make_manifest = require("luarocks.make_manifest")
-commands.add = require("luarocks.add")
-commands.remove = require("luarocks.admin_remove")
-commands.refresh_cache = require("luarocks.refresh_cache")
-
 command_line.run_command(...)
diff --git a/src/luarocks/build.lua b/src/luarocks/build.lua
index ec269023..72b5649e 100644
--- a/src/luarocks/build.lua
+++ b/src/luarocks/build.lua
@@ -31,7 +31,8 @@ or the name of a rock to be fetched from a repository.
                     rock after building a new one. This behavior can
                     be made permanent by setting keep_other_versions=true
                     in the configuration file.
-]]
+
+]]..util.deps_mode_help()
 
 --- Install files to a given location.
 -- Takes a table where the array part is a list of filenames to be copied.
diff --git a/src/luarocks/build/builtin.lua b/src/luarocks/build/builtin.lua
index f9ef4c44..5c58265a 100644
--- a/src/luarocks/build/builtin.lua
+++ b/src/luarocks/build/builtin.lua
@@ -235,8 +235,9 @@ function run(rockspec)
             table.insert(objects, object)
          end
          if not ok then break end
-         local module_name = dir.path(moddir, name:match("([^.]*)$").."."..util.matchquote(cfg.lib_extension)):gsub("//", "/")
+         local module_name = name:match("([^.]*)$").."."..util.matchquote(cfg.lib_extension)
          if moddir ~= "" then
+            module_name = dir.path(moddir, module_name)
             local ok, err = fs.make_dir(moddir)
             if not ok then return nil, err end
          end
diff --git a/src/luarocks/command_line.lua b/src/luarocks/command_line.lua
index e79b1442..19d04290 100644
--- a/src/luarocks/command_line.lua
+++ b/src/luarocks/command_line.lua
@@ -185,7 +185,8 @@ 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, exitcode = xpcall(function() return commands[command].run(unpack(args)) end, function(err)
+      local cmd = require(commands[command])
+      local xp, ok, err, exitcode = xpcall(function() return cmd.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))
diff --git a/src/luarocks/deps.lua b/src/luarocks/deps.lua
index 116b4bbb..0adb5834 100644
--- a/src/luarocks/deps.lua
+++ b/src/luarocks/deps.lua
@@ -689,7 +689,7 @@ function scan_deps(results, missing, manifest, name, version, deps_mode)
    local deplist = dependencies_name[version]
    local rockspec, err
    if not deplist then
-      rockspec, err = fetch.load_local_rockspec(path.rockspec_file(name, version))
+      rockspec, err = fetch.load_local_rockspec(path.rockspec_file(name, version), false)
       if err then
          missing[name.." "..version] = err
          return results, missing
diff --git a/src/luarocks/dir.lua b/src/luarocks/dir.lua
index e8cd746e..1f3b5c3d 100644
--- a/src/luarocks/dir.lua
+++ b/src/luarocks/dir.lua
@@ -35,17 +35,11 @@ end
 -- @return string: a string with a platform-specific representation
 -- of the path.
 function path(...)
-   local items = {...}
-   local i = 1
-   while items[i] do
-      items[i] = items[i]:gsub("(.+)/+$", "%1")
-      if items[i] == "" then
-         table.remove(items, i)
-      else
-         i = i + 1
-      end
+   local t = {...}
+   while t[1] == "" do
+      table.remove(t, 1)
    end
-   return (table.concat(items, "/"):gsub("(.+)/+$", "%1"))
+   return (table.concat(t, "/"):gsub("([^:])/+", "%1/"):gsub("^/+", "/"):gsub("/*$", ""))
 end
 
 --- Split protocol and path from an URL or local pathname.
diff --git a/src/luarocks/fetch.lua b/src/luarocks/fetch.lua
index 53c9d748..83ab6fa9 100644
--- a/src/luarocks/fetch.lua
+++ b/src/luarocks/fetch.lua
@@ -137,9 +137,11 @@ end
 --- Back-end function that actually loads the local rockspec.
 -- Performs some validation and postprocessing of the rockspec contents.
 -- @param filename string: The local filename of the rockspec file.
+-- @param quick boolean: if true, skips some steps when loading
+-- rockspec.
 -- @return table or (nil, string): A table representing the rockspec
 -- or nil followed by an error message.
-function load_local_rockspec(filename)
+function load_local_rockspec(filename, quick)
    assert(type(filename) == "string")
    filename = fs.absolute_name(filename)
    local rockspec, err = persist.load_into_table(filename)
@@ -147,9 +149,12 @@ function load_local_rockspec(filename)
       return nil, "Could not load rockspec file "..filename.." ("..err..")"
    end
 
-   local ok, err = type_check.type_check_rockspec(rockspec)
-   if not ok then
-      return nil, filename..": "..err
+   local ok, err = true, nil
+   if not quick then
+      ok, err = type_check.type_check_rockspec(rockspec)
+      if not ok then
+         return nil, filename..": "..err
+      end
    end
    
    if rockspec.rockspec_format then
@@ -207,9 +212,8 @@ function load_local_rockspec(filename)
    else
       rockspec.dependencies = {}
    end
-   local ok, err = path.configure_paths(rockspec)
-   if err then
-      return nil, "Error verifying paths: "..err
+   if not quick then
+      path.configure_paths(rockspec)
    end
 
    return rockspec
diff --git a/src/luarocks/help.lua b/src/luarocks/help.lua
index 2774dc41..2136f5da 100644
--- a/src/luarocks/help.lua
+++ b/src/luarocks/help.lua
@@ -71,14 +71,10 @@ function run(...)
         can be overriden with VAR=VALUE assignments.]])
       print_section("COMMANDS")
       local names = {}
-      for name, command in pairs(commands) do
-         table.insert(names, name)
-      end
-      table.sort(names)
-      for _, name in ipairs(names) do
-         local command = commands[name]
+      for name, command in util.sortedpairs(commands) do
+         local cmd = require(command)
          util.printout("", name)
-         util.printout("\t", command.help_summary)
+         util.printout("\t", cmd.help_summary)
       end
       print_section("CONFIGURATION")
       util.printout("\tLua version: " .. cfg.lua_version)
@@ -100,15 +96,16 @@ function run(...)
       end
    else
       command = command:gsub("-", "_")
-      if commands[command] then
-         local arguments = commands[command].help_arguments or "<argument>"
+      local cmd = require(commands[command])
+      if cmd then
+         local arguments = cmd.help_arguments or "<argument>"
          print_banner()
          print_section("NAME")
-         util.printout("\t"..program.." "..command.." - "..commands[command].help_summary)
+         util.printout("\t"..program.." "..command.." - "..cmd.help_summary)
          print_section("SYNOPSIS")
          util.printout("\t"..program.." "..command.." "..arguments)
          print_section("DESCRIPTION")
-         util.printout("",(commands[command].help:gsub("\n","\n\t"):gsub("\n\t$","")))
+         util.printout("",(cmd.help:gsub("\n","\n\t"):gsub("\n\t$","")))
          print_section("SEE ALSO")
          util.printout("","'"..program.." help' for general options and configuration.\n")
       else
diff --git a/src/luarocks/index.lua b/src/luarocks/index.lua
index e0785d9c..1ce66f70 100644
--- a/src/luarocks/index.lua
+++ b/src/luarocks/index.lua
@@ -139,15 +139,14 @@ function make_index(repo)
          output = output..version..':&nbsp;'
          table.sort(data, function(a,b) return a.arch < b.arch end)
          for _, item in ipairs(data) do
-            local link = '<a href="$url">'..item.arch..'</a>'
+            local file
             if item.arch == 'rockspec' then
-               local rs = ("%s-%s.rockspec"):format(package, version)
-               if not latest_rockspec then latest_rockspec = rs end
-               link = link:gsub("$url", rs)
+               file = ("%s-%s.rockspec"):format(package, version)
+               if not latest_rockspec then latest_rockspec = file end
             else
-               link = link:gsub("$url", ("%s-%s.%s.rock"):format(package, version, item.arch))
+               file = ("%s-%s.%s.rock"):format(package, version, item.arch)
             end
-            table.insert(versions, link)
+            table.insert(versions, '<a href="'..file..'">'..item.arch..'</a>')
          end
          output = output .. table.concat(versions, ',&nbsp;') .. '<br/>'
       end
diff --git a/src/luarocks/install.lua b/src/luarocks/install.lua
index b28e6282..7458ec8e 100644
--- a/src/luarocks/install.lua
+++ b/src/luarocks/install.lua
@@ -25,7 +25,8 @@ or a filename of a locally available rock.
                     rock after installing a new one. This behavior can
                     be made permanent by setting keep_other_versions=true
                     in the configuration file.
-]]
+]]..util.deps_mode_help()
+
 
 --- Install a binary rock.
 -- @param rock_file string: local or remote filename of a rock.
diff --git a/src/luarocks/manif.lua b/src/luarocks/manif.lua
index 238c4056..ed1780b3 100644
--- a/src/luarocks/manif.lua
+++ b/src/luarocks/manif.lua
@@ -231,18 +231,11 @@ end
 -- @param deps_mode string: Dependency mode: "one" for the current default tree,
 -- "all" for all trees, "order" for all trees with priority >= the current default,
 -- "none" for no trees.
--- @param repodir string: directory of repository being scanned
--- @param filter_lua string or nil: filter by Lua version
--- @param cache table: temporary rockspec cache table
-local function update_dependencies(manifest, deps_mode, repodir, filter_lua, cache)
+local function update_dependencies(manifest, deps_mode)
    assert(type(manifest) == "table")
    assert(type(deps_mode) == "string")
    
-   cache = cache or {}
-   local lua_version = filter_lua and deps.parse_version(filter_lua)
-   
    for pkg, versions in pairs(manifest.repository) do
-      local to_remove = {}
       for version, repositories in pairs(versions) do
          local current = pkg.." "..version
          for _, repo in ipairs(repositories) do
@@ -259,11 +252,34 @@ local function update_dependencies(manifest, deps_mode, repodir, filter_lua, cac
                      end
                   end
                end
-            elseif filter_lua and repo.arch == "rockspec" then
+            end
+         end
+      end
+   end
+end
+
+--- Filter manifest table by Lua version, removing rockspecs whose Lua version
+-- does not match.
+-- @param manifest table: a manifest table.
+-- @param lua_version string or nil: filter by Lua version
+-- @param repodir string: directory of repository being scanned
+-- @param cache table: temporary rockspec cache table
+local function filter_by_lua_version(manifest, lua_version, repodir, cache)
+   assert(type(manifest) == "table")
+   assert(type(repodir) == "string")
+   assert((not cache) or type(cache) == "table")
+   
+   cache = cache or {}
+   lua_version = deps.parse_version(lua_version)
+   for pkg, versions in pairs(manifest.repository) do
+      local to_remove = {}
+      for version, repositories in pairs(versions) do
+         for _, repo in ipairs(repositories) do
+            if repo.arch == "rockspec" then
                local pathname = dir.path(repodir, pkg.."-"..version..".rockspec")
                local rockspec, err = cache[pathname]
                if not rockspec then
-                  rockspec, err = fetch.load_local_rockspec(pathname)
+                  rockspec, err = fetch.load_local_rockspec(pathname, true)
                end
                if rockspec then
                   cache[pathname] = rockspec
@@ -283,9 +299,9 @@ local function update_dependencies(manifest, deps_mode, repodir, filter_lua, cac
       end
       if next(to_remove) then
          for _, incompat in ipairs(to_remove) do
-            manifest.repository[pkg][incompat] = nil
+            versions[incompat] = nil
          end
-         if not next(manifest.repository[pkg]) then
+         if not next(versions) then
             manifest.repository[pkg] = nil
          end
       end
@@ -296,17 +312,12 @@ end
 -- @param results table: The search results as returned by search.disk_search.
 -- @param manifest table: A manifest table (must contain repository, modules, commands tables).
 -- It will be altered to include the search results.
--- @param deps_mode string: Dependency mode: "one" for the current default tree,
--- "all" for all trees, "order" for all trees with priority >= the current default,
--- "none" for no trees.
--- @param repo string: directory of repository
--- @param filter_lua string or nil: filter by Lua version
--- @param cache table: temporary rockspec cache table
+-- @param dep_handler: dependency handler function
 -- @return boolean or (nil, string): true in case of success, or nil followed by an error message.
-local function store_results(results, manifest, deps_mode, repo, filter_lua, cache)
+local function store_results(results, manifest, dep_handler)
    assert(type(results) == "table")
    assert(type(manifest) == "table")
-   assert(type(deps_mode) == "string")
+   assert((not dep_handler) or type(dep_handler) == "function")
 
    for name, versions in pairs(results) do
       local pkgtable = manifest.repository[name] or {}
@@ -329,7 +340,9 @@ local function store_results(results, manifest, deps_mode, repo, filter_lua, cac
       end
       manifest.repository[name] = pkgtable
    end
-   update_dependencies(manifest, deps_mode, repo, filter_lua, cache)
+   if dep_handler then
+      dep_handler(manifest)
+   end
    sort_package_matching_table(manifest.modules)
    sort_package_matching_table(manifest.commands)
    return true
@@ -345,7 +358,7 @@ end
 -- @param versioned boolean: if versioned versions of the manifest should be created.
 -- @return boolean or (nil, string): True if manifest was generated,
 -- or nil and an error message.
-function make_manifest(repo, deps_mode, versioned)
+function make_manifest(repo, deps_mode, remote)
    assert(type(repo) == "string")
    assert(type(deps_mode) == "string")
 
@@ -363,14 +376,23 @@ function make_manifest(repo, deps_mode, versioned)
 
    manif_core.manifest_cache[repo] = manifest
 
-   local cache = {}
-   local ok, err = store_results(results, manifest, deps_mode, repo, nil, cache)
+   local dep_handler = nil
+   if not remote then
+      dep_handler = function(manifest)
+         update_dependencies(manifest, deps_mode)
+      end
+   end
+   local ok, err = store_results(results, manifest, dep_handler)
    if not ok then return nil, err end
 
-   if versioned then
+   if remote then
+      local cache = {}
       for luaver in util.lua_versions() do
          local vmanifest = { repository = {}, modules = {}, commands = {} }
-         local ok, err = store_results(results, vmanifest, deps_mode, repo, luaver, cache)
+         local dep_handler = function(manifest)
+            filter_by_lua_version(manifest, luaver, repo, cache)
+         end
+         local ok, err = store_results(results, vmanifest, dep_handler)
          save_table(repo, "manifest-"..luaver, vmanifest)
       end
    end
@@ -416,7 +438,10 @@ function update_manifest(name, version, repo, deps_mode)
 
    local results = {[name] = {[version] = {{arch = "installed", repo = repo}}}}
 
-   local ok, err = store_results(results, manifest, deps_mode, repo)
+   local dep_handler = function(manifest)
+      update_dependencies(manifest, deps_mode)
+   end
+   local ok, err = store_results(results, manifest, dep_handler)
    if not ok then return nil, err end
 
    return save_table(repo, "manifest", manifest)
diff --git a/src/luarocks/remove.lua b/src/luarocks/remove.lua
index f2f6997b..8f751a93 100644
--- a/src/luarocks/remove.lua
+++ b/src/luarocks/remove.lua
@@ -22,7 +22,8 @@ Will only perform the removal if it does not break dependencies.
 To override this check and force the removal, use --force.
 To perform a forced removal without reporting dependency issues,
 use --force=fast.
-]]
+
+]]..util.deps_mode_help()
 
 --- Obtain a list of packages that depend on the given set of packages
 -- (where all packages of the set are versions of one program).
diff --git a/src/luarocks/search.lua b/src/luarocks/search.lua
index 76ea6815..ad205d6a 100644
--- a/src/luarocks/search.lua
+++ b/src/luarocks/search.lua
@@ -139,14 +139,15 @@ function disk_search(repo, query, results)
    for _, name in pairs(fs.list_dir(repo)) do
       local pathname = dir.path(repo, name)
       local rname, rversion, rarch = path.parse_name(name)
-      if fs.is_dir(pathname) then
+
+      if rname and (pathname:match(".rockspec$") or pathname:match(".rock$")) then
+         store_if_match(results, repo, rname, rversion, rarch, query)
+      elseif fs.is_dir(pathname) then
          for _, version in pairs(fs.list_dir(pathname)) do
             if version:match("-%d+$") then
                store_if_match(results, repo, name, version, "installed", query)
             end
          end
-      elseif rname then
-         store_if_match(results, repo, rname, rversion, rarch, query)
       end
    end
    return results
diff --git a/src/luarocks/util.lua b/src/luarocks/util.lua
index 1a60fd9c..4b138516 100644
--- a/src/luarocks/util.lua
+++ b/src/luarocks/util.lua
@@ -8,6 +8,8 @@ local global_env = _G
 
 module("luarocks.util", package.seeall)
 
+local cfg = require("luarocks.cfg")
+
 local scheduled_functions = {}
 local debug = require("debug")
 
@@ -371,6 +373,24 @@ function this_program(default)
    return last:sub(2)
 end
 
+function deps_mode_help(program)
+   return [[
+--deps-mode=<mode>  How to handle dependencies. Four modes are supported:
+                    * all - use all trees from the rocks_trees list
+                      for finding dependencies
+                    * one - use only the current tree (possibly set
+                      with --tree)
+                    * order - use trees based on order (use the current
+                      tree and all trees below it on the rocks_trees list)
+                    * none - ignore dependencies altogether.
+                    The default mode may be set with the deps_mode entry
+                    in the configuration file.
+                    The current default is "]]..cfg.deps_mode..[[".
+                    Type ']]..this_program(program or "luarocks")..[[' with no arguments to see
+                    your list of rocks trees.
+]]
+end
+
 function see_help(command, program)
    return "See '"..this_program(program or "luarocks")..' help '..command.."'."
 end
diff --git a/src/luarocks/write_rockspec.lua b/src/luarocks/write_rockspec.lua
index f8035b8d..a27f0b63 100644
--- a/src/luarocks/write_rockspec.lua
+++ b/src/luarocks/write_rockspec.lua
@@ -31,10 +31,14 @@ rockspec, and is not guaranteed to be complete or correct.
 --homepage=<url>      Project homepage.
 --lua-version=<ver>   Supported Lua versions. Accepted values are "5.1", "5.2"
                       or "5.1,5.2".
+--tag=<tag>           Tag to use. Will attempt to extract version number from it.
 --lib=<lib>[,<lib>]   A comma-separated list of libraries that C files need to
                       link to.
 ]]
 
+local function open_file(name)
+   return io.open(dir.path(fs.current_dir(), name), "r")
+end
 
 local function get_url(rockspec)
    local url = rockspec.source.url
@@ -79,12 +83,11 @@ local function configure_lua_version(rockspec, luaver)
 end
 
 local function detect_description(rockspec)
-   local fd = io.open("README.md", "r")
-   if not fd then fd = io.open("README", "r") end
+   local fd = open_file("README.md") or open_file("README")
    if not fd then return end
    local data = fd:read("*a")
    fd:close()
-   local paragraph = data:match("\n\n(.-)\n\n")
+   local paragraph = data:match("\n\n([^%[].-)\n\n")
    if not paragraph then paragraph = data:match("\n\n(.*)") end
    if paragraph then
       if #paragraph < 80 then
@@ -100,19 +103,32 @@ local function detect_description(rockspec)
    end
 end
 
+local function detect_mit_license(data)
+   local strip_copyright = (data:gsub("Copyright [^\n]*\n", ""))
+   local sum = 0
+   for i = 1, #strip_copyright do
+      local num = string.byte(strip_copyright:sub(i,i))
+      if num > 32 and num <= 128 then
+         sum = sum + num
+      end
+   end
+   return sum == 78656
+end
+
 local function show_license(rockspec)
-   local fd = io.open("COPYING", "r")
-   if not fd then fd = io.open("LICENSE", "r") end
-   if not fd then return end
+   local fd = open_file("COPYING") or open_file("LICENSE") or open_file("MIT-LICENSE.txt")
+   if not fd then return nil end
    local data = fd:read("*a")
    fd:close()
+   local is_mit = detect_mit_license(data)
    util.title("License for "..rockspec.package..":")
    util.printout(data)
    util.printout()
+   return is_mit
 end
 
 local function get_cmod_name(file)
-   local fd = io.open(file, "r")
+   local fd = open_file(file)
    if not fd then return nil end
    local data = fd:read("*a")
    fd:close()
@@ -199,22 +215,35 @@ function run(...)
    elseif not url_or_dir then
       url_or_dir = version
    end
+
+   if flags["tag"] == true then
+      return nil, "Incorrect usage: --tag requires an argument. "..util.see_help("write_rockspec")
+   end
+   
+   if flags["tag"] then
+      if not version then
+         version = flags["tag"]:gsub("^v", "")
+      end
+   end
    
    local protocol, pathname = dir.split_url(url_or_dir)
    if not fetch.is_basic_protocol(protocol) then
-      version = "scm"
       if not name then
          name = dir.base_name(url_or_dir):gsub("%.[^.]+$", "")
       end
+      if not version then
+         version = "scm"
+      end
    elseif protocol ~= "file" then
       local filename = dir.base_name(url_or_dir)
       local newname, newversion = filename:match("(.*)-([^-]+)")
-      if not name then
+      if (not name) and newname then
          name = newname
       end
-      if newversion then
+      if (not version) and newversion then
          version = newversion:gsub(".[a-z]+$", ""):gsub(".tar$", "")
-      else
+      end
+      if not (name and version) then
          return nil, "Missing name and version arguments. "..util.see_help("write_rockspec")
       end
    elseif not version then
@@ -222,13 +251,18 @@ function run(...)
    end
 
    local filename = flags["output"] or dir.path(fs.current_dir(), name:lower().."-"..version.."-1.rockspec")
+   
+   if not flags["homepage"] and url_or_dir:match("^git://github.com") then
+      flags["homepage"] = "http://"..url_or_dir:match("^[^:]+://(.*)")
+   end
 
    local rockspec = {
       package = name,
       name = name:lower(),
       version = version.."-1",
       source = {
-         url = "*** please add URL for source tarball, zip or repository here ***"
+         url = "*** please add URL for source tarball, zip or repository here ***",
+         tag = flags["tag"],
       },
       description = {
          summary = flags["summary"] or "*** please specify description summary ***",
@@ -252,7 +286,7 @@ function run(...)
       rockspec.source.dir = "dummy"
       if not fetch.is_basic_protocol(rockspec.source.protocol) then
          if version ~= "scm" then
-            rockspec.source.tag = "v" .. version
+            rockspec.source.tag = flags["tag"] or "v" .. version
          end
       end
       rockspec.source.dir = nil
@@ -290,7 +324,11 @@ function run(...)
 
    detect_description(rockspec)
 
-   show_license(rockspec)
+   local is_mit = show_license(rockspec)
+   
+   if is_mit and not flags["license"] then
+      rockspec.description.license = "MIT"
+   end
    
    fill_as_builtin(rockspec, libs)