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//go:build !windows
package homedir
// Copyright 2013-2018 Docker, Inc.
// NOTE: this package has originally been copied from github.com/docker/docker.
import (
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
"sync"
"syscall"
"github.com/containers/storage/pkg/unshare"
"github.com/sirupsen/logrus"
)
// Key returns the env var name for the user's home dir based on
// the platform being run on
func Key() string {
return "HOME"
}
// Get returns the home directory of the current user with the help of
// environment variables depending on the target operating system.
// Returned path should be used with "path/filepath" to form new paths.
//
// If linking statically with cgo enabled against glibc, ensure the
// osusergo build tag is used.
//
// If needing to do nss lookups, do not disable cgo or set osusergo.
func Get() string {
homedir, _ := unshare.HomeDir()
return homedir
}
// GetShortcutString returns the string that is shortcut to user's home directory
// in the native shell of the platform running on.
func GetShortcutString() string {
return "~"
}
// StickRuntimeDirContents sets the sticky bit on files that are under
// XDG_RUNTIME_DIR, so that the files won't be periodically removed by the system.
//
// StickyRuntimeDir returns slice of sticked files.
// StickyRuntimeDir returns nil error if XDG_RUNTIME_DIR is not set.
//
// See also https://standards.freedesktop.org/basedir-spec/latest/ar01s03.html
func StickRuntimeDirContents(files []string) ([]string, error) {
runtimeDir, err := GetRuntimeDir()
if err != nil {
// ignore error if runtimeDir is empty
return nil, nil //nolint: nilerr
}
runtimeDir, err = filepath.Abs(runtimeDir)
if err != nil {
return nil, err
}
var sticked []string
for _, f := range files {
f, err = filepath.Abs(f)
if err != nil {
return sticked, err
}
if strings.HasPrefix(f, runtimeDir+"/") {
if err = stick(f); err != nil {
return sticked, err
}
sticked = append(sticked, f)
}
}
return sticked, nil
}
func stick(f string) error {
st, err := os.Stat(f)
if err != nil {
return err
}
m := st.Mode()
m |= os.ModeSticky
return os.Chmod(f, m)
}
var (
rootlessConfigHomeDirError error
rootlessConfigHomeDirOnce sync.Once
rootlessConfigHomeDir string
rootlessRuntimeDirOnce sync.Once
rootlessRuntimeDir string
)
// isWriteableOnlyByOwner checks that the specified permission mask allows write
// access only to the owner.
func isWriteableOnlyByOwner(perm os.FileMode) bool {
return (perm & 0o722) == 0o700
}
// GetConfigHome returns XDG_CONFIG_HOME.
// GetConfigHome returns $HOME/.config and nil error if XDG_CONFIG_HOME is not set.
//
// See also https://standards.freedesktop.org/basedir-spec/latest/ar01s03.html
func GetConfigHome() (string, error) {
rootlessConfigHomeDirOnce.Do(func() {
cfgHomeDir := os.Getenv("XDG_CONFIG_HOME")
if cfgHomeDir == "" {
home := Get()
resolvedHome, err := filepath.EvalSymlinks(home)
if err != nil {
rootlessConfigHomeDirError = fmt.Errorf("cannot resolve %s: %w", home, err)
return
}
tmpDir := filepath.Join(resolvedHome, ".config")
_ = os.MkdirAll(tmpDir, 0o700)
st, err := os.Stat(tmpDir)
if err != nil {
rootlessConfigHomeDirError = err
return
} else if int(st.Sys().(*syscall.Stat_t).Uid) == os.Geteuid() {
cfgHomeDir = tmpDir
} else {
rootlessConfigHomeDirError = fmt.Errorf("path %q exists and it is not owned by the current user", tmpDir)
return
}
}
rootlessConfigHomeDir = cfgHomeDir
})
return rootlessConfigHomeDir, rootlessConfigHomeDirError
}
// GetRuntimeDir returns a directory suitable to store runtime files.
// The function will try to use the XDG_RUNTIME_DIR env variable if it is set.
// XDG_RUNTIME_DIR is typically configured via pam_systemd.
// If XDG_RUNTIME_DIR is not set, GetRuntimeDir will try to find a suitable
// directory for the current user.
//
// See also https://standards.freedesktop.org/basedir-spec/latest/ar01s03.html
func GetRuntimeDir() (string, error) {
var rootlessRuntimeDirError error
rootlessRuntimeDirOnce.Do(func() {
runtimeDir := os.Getenv("XDG_RUNTIME_DIR")
if runtimeDir != "" {
rootlessRuntimeDir, rootlessRuntimeDirError = filepath.EvalSymlinks(runtimeDir)
return
}
uid := strconv.Itoa(unshare.GetRootlessUID())
if runtimeDir == "" {
tmpDir := filepath.Join("/run", "user", uid)
if err := os.MkdirAll(tmpDir, 0o700); err != nil {
logrus.Debug(err)
}
st, err := os.Lstat(tmpDir)
if err == nil && int(st.Sys().(*syscall.Stat_t).Uid) == os.Geteuid() && isWriteableOnlyByOwner(st.Mode().Perm()) {
runtimeDir = tmpDir
}
}
if runtimeDir == "" {
tmpDir := filepath.Join(os.TempDir(), fmt.Sprintf("storage-run-%s", uid))
if err := os.MkdirAll(tmpDir, 0o700); err != nil {
logrus.Debug(err)
}
st, err := os.Lstat(tmpDir)
if err == nil && int(st.Sys().(*syscall.Stat_t).Uid) == os.Geteuid() && isWriteableOnlyByOwner(st.Mode().Perm()) {
runtimeDir = tmpDir
} else {
rootlessRuntimeDirError = fmt.Errorf("path %q exists and it is not writeable only by the current user", tmpDir)
return
}
}
rootlessRuntimeDir = runtimeDir
})
return rootlessRuntimeDir, rootlessRuntimeDirError
}
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