Raise specific NoSuchFileError for missing files

lib/linux_admin/common.rb

@@ -24,7 +24,10 @@ def run(cmd, options = {})
         error  ||= ""
         self.exitstatus = nil
       end
-
+    rescue Errno::ENOENT => err
+      raise NoSuchFileError.new(err.message) if NoSuchFileError.detected?(err.message)
+      raise
+    else
       CommandResult.new(output, error, status)
     end
 

lib/linux_admin/exceptions.rb

@@ -8,6 +8,16 @@ def initialize(message, result)
 end
 
 class LinuxAdmin
+  class NoSuchFileError < Errno::ENOENT
+    def initialize(message)
+      super(message.split("No such file or directory -").last.split(" ").first)
+    end
+
+    def self.detected?(message)
+      message.start_with?("No such file or directory -")
+    end
+  end
+
   class CredentialError < CommandResultError
     def initialize(result)
       super("Invalid username or password", result)

spec/common_spec.rb

@@ -100,7 +100,7 @@ class TestClass
       end
 
       it "command bad" do
-        expect {subject.send(run_method, "XXXXX")}.to raise_error(Errno::ENOENT)
+        expect {subject.send(run_method, "XXXXX --user=bob")}.to raise_error(LinuxAdmin::NoSuchFileError, "No such file or directory - XXXXX")
       end
 
       context "#exit_status" do