Add checkout --unstaged flag

commands/command_checkout.go

@@ -20,6 +20,7 @@ var (
 		Use: "checkout",
 		Run: checkoutCommand,
 	}
+	checkoutUnstagedArg bool
 )
 
 func checkoutCommand(cmd *cobra.Command, args []string) {
@@ -43,6 +44,7 @@ func checkoutCommand(cmd *cobra.Command, args []string) {
 }
 
 func init() {
+	checkoutCmd.Flags().BoolVarP(&checkoutUnstagedArg, "unstaged", "u", false, "Do not add files to the index")
 	RootCmd.AddCommand(checkoutCmd)
 }
 
@@ -207,7 +209,7 @@ func checkoutWithChan(in <-chan *lfs.WrappedPointer) {
 			}
 		}
 
-		if cmd == nil {
+		if cmd == nil && !checkoutUnstagedArg {
 			// Fire up the update-index command
 			cmd = exec.Command("git", "update-index", "-q", "--refresh", "--stdin")
 			updateIdxStdin, err = cmd.StdinPipe()
@@ -221,7 +223,9 @@ func checkoutWithChan(in <-chan *lfs.WrappedPointer) {
 
 		}
 
-		updateIdxStdin.Write([]byte(cwdfilepath + "\n"))
+		if updateIdxStdin != nil {
+			updateIdxStdin.Write([]byte(cwdfilepath + "\n"))
+		}
 	}
 	close(repopathchan)
 

docs/man/git-lfs-checkout.1.ronn

@@ -3,7 +3,7 @@ git-lfs-checkout(1) -- Update working copy with file content if available
 
 ## SYNOPSIS
 
-`git lfs checkout` <filespec>...
+`git lfs checkout` [options] <filespec>...
 
 ## DESCRIPTION
 
@@ -18,6 +18,11 @@ we have it in the local store. Modified files are never overwritten.
 
 Filespecs can be provided as arguments to restrict the files which are updated.
 
+## OPTIONS
+
+* `--unstaged` `-u`:
+  Do not add files to the index, keeping them unstaged.
+
 ## EXAMPLES
 
 * Checkout all files that are missing or placeholders

test/test-checkout.sh

@@ -119,3 +119,34 @@ begin_test "checkout: outside git repository"
   grep "Not in a git repository" checkout.log
 )
 end_test
+
+begin_test "checkout --unstaged"
+(
+  set -e
+
+  reponame="$(basename "$0" ".sh")-unstaged"
+  setup_remote_repo "$reponame"
+
+  clone_repo "$reponame" repo-unstaged
+
+  git lfs track "*.dat" 2>&1 | tee track.log
+
+  contents="something something"
+
+  printf "$contents" > file1.dat
+  git add file1.dat
+  git add .gitattributes
+  git commit -m "add files"
+
+  # Remove the working directory
+  rm -f file1.dat
+
+  echo "checkout should replace all"
+  git lfs checkout --unstaged
+  [ "$contents" = "$(cat file1.dat)" ]
+
+  echo "large files should not be staged"
+  git diff-files
+  git diff-files | grep file1.dat
+)
+end_test