mirror of
https://github.com/k3s-io/k3s.git
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94 lines
2.7 KiB
Go
94 lines
2.7 KiB
Go
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/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package fs
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import (
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"io/ioutil"
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"path/filepath"
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"strings"
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)
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// ConfirmedDir is a clean, absolute, delinkified path
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// that was confirmed to point to an existing directory.
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type ConfirmedDir string
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// NewTmpConfirmedDir returns a temporary dir, else error.
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// The directory is cleaned, no symlinks, etc. so its
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// returned as a ConfirmedDir.
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func NewTmpConfirmedDir() (ConfirmedDir, error) {
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n, err := ioutil.TempDir("", "kustomize-")
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if err != nil {
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return "", err
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}
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// In MacOs `ioutil.TempDir` creates a directory
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// with root in the `/var` folder, which is in turn a symlinked path
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// to `/private/var`.
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// Function `filepath.EvalSymlinks`is used to
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// resolve the real absolute path.
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deLinked, err := filepath.EvalSymlinks(n)
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return ConfirmedDir(deLinked), err
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}
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// HasPrefix returns true if the directory argument
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// is a prefix of self (d) from the point of view of
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// a file system.
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//
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// I.e., it's true if the argument equals or contains
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// self (d) in a file path sense.
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//
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// HasPrefix emulates the semantics of strings.HasPrefix
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// such that the following are true:
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//
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// strings.HasPrefix("foobar", "foobar")
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// strings.HasPrefix("foobar", "foo")
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// strings.HasPrefix("foobar", "")
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//
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// d := fSys.ConfirmDir("/foo/bar")
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// d.HasPrefix("/foo/bar")
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// d.HasPrefix("/foo")
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// d.HasPrefix("/")
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//
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// Not contacting a file system here to check for
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// actual path existence.
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//
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// This is tested on linux, but will have trouble
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// on other operating systems.
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// TODO(monopole) Refactor when #golang/go/18358 closes.
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// See also:
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// https://github.com/golang/go/issues/18358
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// https://github.com/golang/dep/issues/296
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// https://github.com/golang/dep/blob/master/internal/fs/fs.go#L33
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// https://codereview.appspot.com/5712045
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func (d ConfirmedDir) HasPrefix(path ConfirmedDir) bool {
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if path.String() == string(filepath.Separator) || path == d {
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return true
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}
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return strings.HasPrefix(
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string(d),
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string(path)+string(filepath.Separator))
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}
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func (d ConfirmedDir) Join(path string) string {
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return filepath.Join(string(d), path)
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}
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func (d ConfirmedDir) String() string {
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return string(d)
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}
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