mirror of https://github.com/helm/helm
refactor symWalk() into pkg/sympath (#3199)
* refactor symWalk() into pkg/sympath * add Go copyright * remove dead codepull/3323/head v2.8.0-rc.1
parent
9d0f9a24fd
commit
e1027fae73
@ -0,0 +1,115 @@
|
|||||||
|
/*
|
||||||
|
Copyright (c) for portions of walk.go are held by The Go Authors, 2009 and are provided under
|
||||||
|
the BSD license.
|
||||||
|
|
||||||
|
https://github.com/golang/go/blob/master/LICENSE
|
||||||
|
|
||||||
|
Copyright 2017 The Kubernetes Authors All rights reserved.
|
||||||
|
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 sympath
|
||||||
|
|
||||||
|
import (
|
||||||
|
"fmt"
|
||||||
|
"os"
|
||||||
|
"path/filepath"
|
||||||
|
"sort"
|
||||||
|
)
|
||||||
|
|
||||||
|
// Walk walks the file tree rooted at root, calling walkFn for each file or directory
|
||||||
|
// in the tree, including root. All errors that arise visiting files and directories
|
||||||
|
// are filtered by walkFn. The files are walked in lexical order, which makes the
|
||||||
|
// output deterministic but means that for very large directories Walk can be
|
||||||
|
// inefficient. Walk follows symbolic links.
|
||||||
|
func Walk(root string, walkFn filepath.WalkFunc) error {
|
||||||
|
info, err := os.Lstat(root)
|
||||||
|
if err != nil {
|
||||||
|
err = walkFn(root, nil, err)
|
||||||
|
} else {
|
||||||
|
err = symwalk(root, info, walkFn)
|
||||||
|
}
|
||||||
|
if err == filepath.SkipDir {
|
||||||
|
return nil
|
||||||
|
}
|
||||||
|
return err
|
||||||
|
}
|
||||||
|
|
||||||
|
// readDirNames reads the directory named by dirname and returns
|
||||||
|
// a sorted list of directory entries.
|
||||||
|
func readDirNames(dirname string) ([]string, error) {
|
||||||
|
f, err := os.Open(dirname)
|
||||||
|
if err != nil {
|
||||||
|
return nil, err
|
||||||
|
}
|
||||||
|
names, err := f.Readdirnames(-1)
|
||||||
|
f.Close()
|
||||||
|
if err != nil {
|
||||||
|
return nil, err
|
||||||
|
}
|
||||||
|
sort.Strings(names)
|
||||||
|
return names, nil
|
||||||
|
}
|
||||||
|
|
||||||
|
// symwalk recursively descends path, calling walkFn.
|
||||||
|
func symwalk(path string, info os.FileInfo, walkFn filepath.WalkFunc) error {
|
||||||
|
// Recursively walk symlinked directories.
|
||||||
|
if IsSymlink(info) {
|
||||||
|
resolved, err := filepath.EvalSymlinks(path)
|
||||||
|
if err != nil {
|
||||||
|
return fmt.Errorf("error evaluating symlink %s: %s", path, err)
|
||||||
|
}
|
||||||
|
if info, err = os.Lstat(resolved); err != nil {
|
||||||
|
return err
|
||||||
|
}
|
||||||
|
if err := symwalk(resolved, info, walkFn); err != nil && err != filepath.SkipDir {
|
||||||
|
return err
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if err := walkFn(path, info, nil); err != nil {
|
||||||
|
return err
|
||||||
|
}
|
||||||
|
|
||||||
|
if !info.IsDir() {
|
||||||
|
return nil
|
||||||
|
}
|
||||||
|
|
||||||
|
names, err := readDirNames(path)
|
||||||
|
if err != nil {
|
||||||
|
return walkFn(path, info, err)
|
||||||
|
}
|
||||||
|
|
||||||
|
for _, name := range names {
|
||||||
|
filename := filepath.Join(path, name)
|
||||||
|
fileInfo, err := os.Lstat(filename)
|
||||||
|
if err != nil {
|
||||||
|
if err := walkFn(filename, fileInfo, err); err != nil && err != filepath.SkipDir {
|
||||||
|
return err
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
err = symwalk(filename, fileInfo, walkFn)
|
||||||
|
if err != nil {
|
||||||
|
if (!fileInfo.IsDir() && !IsSymlink(fileInfo)) || err != filepath.SkipDir {
|
||||||
|
return err
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return nil
|
||||||
|
}
|
||||||
|
|
||||||
|
// IsSymlink is used to determine if the fileinfo is a symbolic link.
|
||||||
|
func IsSymlink(fi os.FileInfo) bool {
|
||||||
|
return fi.Mode()&os.ModeSymlink != 0
|
||||||
|
}
|
@ -0,0 +1,134 @@
|
|||||||
|
/*
|
||||||
|
Copyright (c) for portions of walk_test.go are held by The Go Authors, 2009 and are provided under
|
||||||
|
the BSD license.
|
||||||
|
|
||||||
|
https://github.com/golang/go/blob/master/LICENSE
|
||||||
|
|
||||||
|
Copyright 2017 The Kubernetes Authors All rights reserved.
|
||||||
|
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 sympath
|
||||||
|
|
||||||
|
import (
|
||||||
|
"os"
|
||||||
|
"path/filepath"
|
||||||
|
"testing"
|
||||||
|
)
|
||||||
|
|
||||||
|
type Node struct {
|
||||||
|
name string
|
||||||
|
entries []*Node // nil if the entry is a file
|
||||||
|
mark int
|
||||||
|
}
|
||||||
|
|
||||||
|
var tree = &Node{
|
||||||
|
"testdata",
|
||||||
|
[]*Node{
|
||||||
|
{"a", nil, 0},
|
||||||
|
{"b", []*Node{}, 0},
|
||||||
|
{"c", nil, 0},
|
||||||
|
{
|
||||||
|
"d",
|
||||||
|
[]*Node{
|
||||||
|
{"x", nil, 0},
|
||||||
|
{"y", []*Node{}, 0},
|
||||||
|
{
|
||||||
|
"z",
|
||||||
|
[]*Node{
|
||||||
|
{"u", nil, 0},
|
||||||
|
{"v", nil, 0},
|
||||||
|
{"w", nil, 0},
|
||||||
|
},
|
||||||
|
0,
|
||||||
|
},
|
||||||
|
},
|
||||||
|
0,
|
||||||
|
},
|
||||||
|
},
|
||||||
|
0,
|
||||||
|
}
|
||||||
|
|
||||||
|
func walkTree(n *Node, path string, f func(path string, n *Node)) {
|
||||||
|
f(path, n)
|
||||||
|
for _, e := range n.entries {
|
||||||
|
walkTree(e, filepath.Join(path, e.name), f)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func makeTree(t *testing.T) {
|
||||||
|
walkTree(tree, tree.name, func(path string, n *Node) {
|
||||||
|
if n.entries == nil {
|
||||||
|
fd, err := os.Create(path)
|
||||||
|
if err != nil {
|
||||||
|
t.Errorf("makeTree: %v", err)
|
||||||
|
return
|
||||||
|
}
|
||||||
|
fd.Close()
|
||||||
|
} else {
|
||||||
|
os.Mkdir(path, 0770)
|
||||||
|
}
|
||||||
|
})
|
||||||
|
}
|
||||||
|
|
||||||
|
func checkMarks(t *testing.T, report bool) {
|
||||||
|
walkTree(tree, tree.name, func(path string, n *Node) {
|
||||||
|
if n.mark != 1 && report {
|
||||||
|
t.Errorf("node %s mark = %d; expected 1", path, n.mark)
|
||||||
|
}
|
||||||
|
n.mark = 0
|
||||||
|
})
|
||||||
|
}
|
||||||
|
|
||||||
|
// Assumes that each node name is unique. Good enough for a test.
|
||||||
|
// If clear is true, any incoming error is cleared before return. The errors
|
||||||
|
// are always accumulated, though.
|
||||||
|
func mark(info os.FileInfo, err error, errors *[]error, clear bool) error {
|
||||||
|
if err != nil {
|
||||||
|
*errors = append(*errors, err)
|
||||||
|
if clear {
|
||||||
|
return nil
|
||||||
|
}
|
||||||
|
return err
|
||||||
|
}
|
||||||
|
name := info.Name()
|
||||||
|
walkTree(tree, tree.name, func(path string, n *Node) {
|
||||||
|
if n.name == name {
|
||||||
|
n.mark++
|
||||||
|
}
|
||||||
|
})
|
||||||
|
return nil
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestWalk(t *testing.T) {
|
||||||
|
makeTree(t)
|
||||||
|
errors := make([]error, 0, 10)
|
||||||
|
clear := true
|
||||||
|
markFn := func(path string, info os.FileInfo, err error) error {
|
||||||
|
return mark(info, err, &errors, clear)
|
||||||
|
}
|
||||||
|
// Expect no errors.
|
||||||
|
err := Walk(tree.name, markFn)
|
||||||
|
if err != nil {
|
||||||
|
t.Fatalf("no error expected, found: %s", err)
|
||||||
|
}
|
||||||
|
if len(errors) != 0 {
|
||||||
|
t.Fatalf("unexpected errors: %s", errors)
|
||||||
|
}
|
||||||
|
checkMarks(t, true)
|
||||||
|
|
||||||
|
// cleanup
|
||||||
|
if err := os.RemoveAll(tree.name); err != nil {
|
||||||
|
t.Errorf("removeTree: %v", err)
|
||||||
|
}
|
||||||
|
}
|
Loading…
Reference in new issue