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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
// Author: arnej
package util
import (
"errors"
"fmt"
"os"
"os/user"
"strings"
"github.com/vespa-engine/vespa/client/go/internal/admin/trace"
)
type FixSpec struct {
UserId int
GroupId int
DirMode os.FileMode
FileMode os.FileMode
}
func NewFixSpec() FixSpec {
return FixSpec{
UserId: -1,
GroupId: -1,
DirMode: 0755,
FileMode: 0644,
}
}
func statNoSymlinks(path string) (info os.FileInfo, err error) {
components := strings.Split(path, "/")
var name string
for idx, x := range components {
if idx == 0 {
name = x
if x == "" {
continue
}
} else {
name = name + "/" + x
}
info, err = os.Lstat(name)
if err != nil {
return
}
if (info.Mode() & os.ModeSymlink) != 0 {
return nil, fmt.Errorf("the path '%s' is a symlink, not allowed", name)
}
trace.SpamDebug("lstat", name, "=>", info.Mode(), err)
}
return info, err
}
// ensure directory exists with suitable permissions
func (spec *FixSpec) FixDir(dirName string) {
info, err := statNoSymlinks(dirName)
if errors.Is(err, os.ErrNotExist) {
trace.Trace("mkdir: ", dirName)
err = os.MkdirAll(dirName, spec.DirMode)
if err != nil {
spec.complainAndExit(err, dirName, spec.DirMode)
}
info, err = statNoSymlinks(dirName)
}
if err != nil {
spec.complainAndExit(err, dirName, spec.DirMode)
}
if !info.IsDir() {
err = fmt.Errorf("Not a directory: '%s'", dirName)
spec.complainAndExit(err, dirName, spec.DirMode)
}
trace.SpamDebug("chown: ", dirName, spec.UserId, spec.GroupId)
err = os.Chown(dirName, spec.UserId, spec.GroupId)
if err != nil {
spec.ensureWritableDir(dirName)
return
}
trace.SpamDebug("chmod: ", dirName, spec.DirMode)
err = os.Chmod(dirName, spec.DirMode)
if err != nil {
spec.ensureWritableDir(dirName)
}
trace.Debug("directory ok:", dirName)
}
// ensure file has suitable permissions if it exists
func (spec *FixSpec) FixFile(fileName string) {
info, err := statNoSymlinks(fileName)
if err != nil {
if !errors.Is(err, os.ErrNotExist) {
spec.complainAndExit(err, fileName, spec.FileMode)
}
return
}
if info.IsDir() {
err = fmt.Errorf("Should not be a directory: '%s'", fileName)
spec.complainAndExit(err, fileName, spec.FileMode)
}
trace.SpamDebug("chown: ", fileName, spec.UserId, spec.GroupId)
err = os.Chown(fileName, spec.UserId, spec.GroupId)
if err != nil {
spec.ensureWritableFile(fileName)
return
}
trace.SpamDebug("chmod: ", fileName, spec.FileMode)
err = os.Chmod(fileName, spec.FileMode)
if err != nil {
spec.ensureWritableFile(fileName)
}
}
func (spec *FixSpec) ensureWritableFile(fileName string) {
f, err := os.OpenFile(fileName, os.O_APPEND|os.O_RDWR, spec.FileMode)
if err == nil {
f.Close()
return
}
trace.Warning(err, "- will try to remove this file")
err = os.Remove(fileName)
if err != nil {
trace.Warning("Could neither write to nor remove '" + fileName + "'")
spec.complainAndExit(err, fileName, spec.FileMode)
}
}
func (spec *FixSpec) ensureWritableDir(dirName string) {
tmpFile, err := os.CreateTemp(dirName, "tmp.probe.*.tmp")
if err != nil {
trace.Warning("Could not create a file in directory '" + dirName + "'")
spec.complainAndExit(err, dirName, spec.DirMode)
}
tmpFile.Close()
err = os.Remove(tmpFile.Name())
if err != nil {
spec.complainAndExit(err, dirName, spec.DirMode)
}
}
func (spec *FixSpec) complainAndExit(got error, fn string, wanted os.FileMode) {
trace.Warning("problem:", got)
currentUser, _ := user.Current()
trace.Warning("Currently running as user:", currentUser.Username)
trace.Warning("Wanted", fn, "to be owned by user id:", spec.UserId)
trace.Warning("Wanted", fn, "to have group id:", spec.GroupId)
trace.Warning("Wanted", fn, "to have permissions:", wanted)
trace.Warning("current status of", fn, "is:")
out, _ := BackTicksWithStderr.Run("stat", "--", fn)
trace.Warning(out)
trace.Warning("this is a fatal error!")
JustExitWith(got)
}
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