mirror of https://github.com/kubernetes/kops.git
137 lines
3.3 KiB
Go
137 lines
3.3 KiB
Go
/*
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Copyright 2016 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 fi
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import (
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"fmt"
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"io"
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"os"
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"path"
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"strconv"
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"github.com/golang/glog"
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"k8s.io/kops/util/pkg/hashing"
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)
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func WriteFile(destPath string, contents Resource, fileMode os.FileMode, dirMode os.FileMode) error {
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err := os.MkdirAll(path.Dir(destPath), dirMode)
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if err != nil {
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return fmt.Errorf("error creating directories for destination file %q: %v", destPath, err)
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}
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err = writeFileContents(destPath, contents, fileMode)
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if err != nil {
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return err
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}
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_, err = EnsureFileMode(destPath, fileMode)
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if err != nil {
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return err
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}
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return nil
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}
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func writeFileContents(destPath string, src Resource, fileMode os.FileMode) error {
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glog.Infof("Writing file %q", destPath)
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out, err := os.OpenFile(destPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, fileMode)
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if err != nil {
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return fmt.Errorf("error opening destination file %q: %v", destPath, err)
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}
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defer out.Close()
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in, err := src.Open()
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if err != nil {
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return fmt.Errorf("error opening source resource for file %q: %v", destPath, err)
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}
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defer SafeClose(in)
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_, err = io.Copy(out, in)
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if err != nil {
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return fmt.Errorf("error writing file %q: %v", destPath, err)
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}
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return nil
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}
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func EnsureFileMode(destPath string, fileMode os.FileMode) (bool, error) {
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changed := false
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stat, err := os.Lstat(destPath)
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if err != nil {
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return changed, fmt.Errorf("error getting file mode for %q: %v", destPath, err)
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}
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if (stat.Mode() & os.ModePerm) == fileMode {
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return changed, nil
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}
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glog.Infof("Changing file mode for %q to %s", destPath, fileMode)
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err = os.Chmod(destPath, fileMode)
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if err != nil {
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return changed, fmt.Errorf("error setting file mode for %q: %v", destPath, err)
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}
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changed = true
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return changed, nil
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}
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func fileHasHash(f string, expected *hashing.Hash) (bool, error) {
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actual, err := expected.Algorithm.HashFile(f)
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if err != nil {
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if os.IsNotExist(err) {
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return false, nil
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}
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return false, err
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}
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if actual.Equal(expected) {
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glog.V(2).Infof("Hash matched for %q: %v", f, expected)
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return true, nil
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} else {
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glog.V(2).Infof("Hash did not match for %q: actual=%v vs expected=%v", f, actual, expected)
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return false, nil
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}
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}
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func ParseFileMode(s string, defaultMode os.FileMode) (os.FileMode, error) {
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fileMode := defaultMode
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if s != "" {
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v, err := strconv.ParseUint(s, 8, 32)
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if err != nil {
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return fileMode, fmt.Errorf("cannot parse file mode %q", s)
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}
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fileMode = os.FileMode(v)
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}
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return fileMode, nil
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}
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func FileModeToString(mode os.FileMode) string {
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return "0" + strconv.FormatUint(uint64(mode), 8)
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}
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func SafeClose(r io.Reader) {
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if r == nil {
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return
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}
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closer, ok := r.(io.Closer)
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if !ok {
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return
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}
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err := closer.Close()
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if err != nil {
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glog.Warningf("unexpected error closing stream: %v", err)
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}
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}
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