mirror of https://github.com/k3s-io/k3s.git
90 lines
1.8 KiB
Go
90 lines
1.8 KiB
Go
package util
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import (
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"os"
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"os/user"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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)
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func SetFileModeForPath(name string, mode os.FileMode) error {
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return os.Chmod(name, mode)
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}
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func SetFileGroupForPath(name string, group string) error {
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// Try to use as group id
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gid, err := strconv.Atoi(group)
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if err == nil {
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return os.Chown(name, -1, gid)
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}
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// Otherwise, it must be a group name
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g, err := user.LookupGroup(group)
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if err != nil {
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return err
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}
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gid, err = strconv.Atoi(g.Gid)
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if err != nil {
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return err
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}
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return os.Chown(name, -1, gid)
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}
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func SetFileModeForFile(file *os.File, mode os.FileMode) error {
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return file.Chmod(mode)
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}
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// ReadFile reads from a file
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func ReadFile(path string) (string, error) {
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if path == "" {
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return "", nil
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}
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for start := time.Now(); time.Since(start) < 4*time.Minute; {
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vpnBytes, err := os.ReadFile(path)
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if err == nil {
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return strings.TrimSpace(string(vpnBytes)), nil
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} else if os.IsNotExist(err) {
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logrus.Infof("Waiting for %s to be available\n", path)
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time.Sleep(2 * time.Second)
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} else {
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return "", err
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}
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}
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return "", errors.New("Timeout while trying to read the file")
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}
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// AtomicWrite firsts writes data to a temp file, then renames to the destination file.
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// This ensures that the destination file is never partially written.
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func AtomicWrite(fileName string, data []byte, perm os.FileMode) error {
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f, err := os.CreateTemp(filepath.Dir(fileName), filepath.Base(fileName)+".tmp")
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if err != nil {
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return err
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}
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tmpName := f.Name()
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defer os.Remove(tmpName)
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if _, err := f.Write(data); err != nil {
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f.Close()
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return err
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}
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if err := f.Chmod(perm); err != nil {
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return err
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}
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if err := f.Sync(); err != nil {
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return err
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}
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if err := f.Close(); err != nil {
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return err
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}
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return os.Rename(tmpName, fileName)
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}
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