core: Implement FastAbs to avoid repeated os.Getwd calls (#6687)

* core: Implement FastAbs to avoid repeated os.Getwd calls

* Lint

* Rename files

1 files changed, 14 insertions, 0 deletions

diff --git a/filesystem.go b/filesystem.go
index 9785f57d4..d6679e90b 100644
--- a/filesystem.go
+++ b/filesystem.go
@@ -1,3 +1,17 @@
+// Copyright 2015 Matthew Holt and The Caddy Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package caddy
 
 import "io/fs"