117 lines
2.8 KiB
Go
117 lines
2.8 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package system
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import (
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"os/exec"
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"path"
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"strconv"
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"github.com/coreos/coreos-cloudinit/config"
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)
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// File is a top-level structure which embeds its underlying configuration,
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// config.File, and provides the system-specific Permissions().
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type File struct {
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config.File
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}
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func (f *File) Permissions() (os.FileMode, error) {
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if f.RawFilePermissions == "" {
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return os.FileMode(0644), nil
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}
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// Parse string representation of file mode as integer
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perm, err := strconv.ParseInt(f.RawFilePermissions, 8, 32)
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if err != nil {
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return 0, fmt.Errorf("Unable to parse file permissions %q as integer", f.RawFilePermissions)
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}
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return os.FileMode(perm), nil
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}
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func WriteFile(f *File, root string) (string, error) {
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fullpath := path.Join(root, f.Path)
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dir := path.Dir(fullpath)
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log.Printf("Writing file to %q", fullpath)
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content, err := config.DecodeContent(f.Content, f.Encoding)
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if err != nil {
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return "", fmt.Errorf("Unable to decode %s (%v)", f.Path, err)
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}
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if err := EnsureDirectoryExists(dir); err != nil {
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return "", err
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}
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perm, err := f.Permissions()
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if err != nil {
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return "", err
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}
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var tmp *os.File
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// Create a temporary file in the same directory to ensure it's on the same filesystem
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if tmp, err = ioutil.TempFile(dir, "cloudinit-temp"); err != nil {
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return "", err
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}
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if err := ioutil.WriteFile(tmp.Name(), content, perm); err != nil {
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return "", err
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}
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if err := tmp.Close(); err != nil {
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return "", err
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}
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// Ensure the permissions are as requested (since WriteFile can be affected by sticky bit)
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if err := os.Chmod(tmp.Name(), perm); err != nil {
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return "", err
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}
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if f.Owner != "" {
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// We shell out since we don't have a way to look up unix groups natively
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cmd := exec.Command("chown", f.Owner, tmp.Name())
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if err := cmd.Run(); err != nil {
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return "", err
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}
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}
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if err := os.Rename(tmp.Name(), fullpath); err != nil {
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return "", err
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}
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log.Printf("Wrote file to %q", fullpath)
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return fullpath, nil
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}
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func EnsureDirectoryExists(dir string) error {
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info, err := os.Stat(dir)
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if err == nil {
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if !info.IsDir() {
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return fmt.Errorf("%s is not a directory", dir)
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}
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} else {
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err = os.MkdirAll(dir, 0755)
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if err != nil {
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return err
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}
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}
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return nil
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}
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