os: add Root.Remove

For #67002

Change-Id: Ibbf44c0bf62f53695a7399ba0dae5b84d5efd374
Reviewed-on: https://go-review.googlesource.com/c/go/+/627076
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/os/root_openat.go b/src/os/root_openat.go
index 7f6619bab4..a03208b4c1 100644
--- a/src/os/root_openat.go
+++ b/src/os/root_openat.go
@@ -74,6 +74,16 @@ func rootMkdir(r *Root, name string, perm FileMode) error {
 	return err
 }
 
+func rootRemove(r *Root, name string) error {
+	_, err := doInRoot(r, name, func(parent sysfdType, name string) (struct{}, error) {
+		return struct{}{}, removeat(parent, name)
+	})
+	if err != nil {
+		return &PathError{Op: "removeat", Path: name, Err: err}
+	}
+	return err
+}
+
 // doInRoot performs an operation on a path in a Root.
 //
 // It opens the directory containing the final element of the path,