lib/schema_dev/gemfiles.rb in schema_dev-1.2.5 vs lib/schema_dev/gemfiles.rb in schema_dev-1.3.0

@@ -6,41 +6,50 @@
     extend self
 
     TEMPLATES_ROOT = Pathname.new(__FILE__).dirname.parent.parent + "templates"
 
     def build(config)
-      @src_root = TEMPLATES_ROOT
-      @dst_root = Pathname.new('.')
+      Dir.mktmpdir do |tmpdir|
+        @src_root = TEMPLATES_ROOT
+        @dst_root = Pathname.new(tmpdir).realpath
 
-      path = Pathname.new("gemfiles")
+        relpath = Pathname.new("gemfiles")
+        abspath = @dst_root + relpath
+        target_abspath = Pathname.new(".").realpath + relpath
 
-      _blow_away(path)
+        _copy(relpath, 'Gemfile.base')
 
-      _copy(path, 'Gemfile.base')
+        config.rails.each do |rails|
 
-      config.rails.each do |rails|
+          rails_path = relpath + "rails-#{rails}"
+          _copy(rails_path, 'Gemfile.base')
 
-        rails_path = path + "rails-#{rails}"
-        _copy(rails_path, 'Gemfile.base')
+          config.db.each do |db|
+            _copy(rails_path, "Gemfile.#{db}")
+          end
+        end
 
-        config.db.each do |db|
-          _copy(rails_path, "Gemfile.#{db}")
+        if `diff -rq #{abspath} gemfiles 2>&1 | grep -v lock`.length == 0
+          return false
         end
+
+        _blow_away(target_abspath)
+        abspath.rename(target_abspath)
+        return true
       end
-      return true
     end
 
-    def _copy(path, filename)
-      srcfile = @src_root + path + filename
-      dstfile = @dst_root + path + filename
+    def _copy(relpath, filename)
+      srcfile = @src_root + relpath + filename
+      dstfile = @dst_root + relpath + filename
       return unless srcfile.exist?
 
       dstfile.dirname.mkpath
       FileUtils.copy_file(srcfile, dstfile)
     end
 
-    def _blow_away(path)
-      (@dst_root + path).rmtree
+    def _blow_away(relpath)
+      (@dst_root + relpath).rmtree
     rescue Errno::ENOENT
     end
   end
 end