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// +build linux darwin
package config
import (
"fmt"
"os"
"path/filepath"
"sync"
"syscall"
"github.com/containers/storage/pkg/unshare"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
var (
rootlessRuntimeDirOnce sync.Once
rootlessRuntimeDir string
)
// getRuntimeDir returns the runtime directory
func getRuntimeDir() (string, error) {
var rootlessRuntimeDirError error
rootlessRuntimeDirOnce.Do(func() {
runtimeDir := os.Getenv("XDG_RUNTIME_DIR")
if runtimeDir != "" {
st, err := os.Stat(runtimeDir)
if err != nil {
rootlessRuntimeDirError = err
return
}
if int(st.Sys().(*syscall.Stat_t).Uid) != os.Geteuid() {
rootlessRuntimeDirError = fmt.Errorf("XDG_RUNTIME_DIR directory %q is not owned by the current user", runtimeDir)
return
}
}
uid := fmt.Sprintf("%d", unshare.GetRootlessUID())
if runtimeDir == "" {
tmpDir := filepath.Join("/run", "user", uid)
if err := os.MkdirAll(tmpDir, 0700); err != nil {
logrus.Debugf("unable to make temp dir %s", tmpDir)
}
st, err := os.Stat(tmpDir)
if err == nil && int(st.Sys().(*syscall.Stat_t).Uid) == os.Geteuid() && st.Mode().Perm() == 0700 {
runtimeDir = tmpDir
}
}
if runtimeDir == "" {
tmpDir := filepath.Join(os.TempDir(), fmt.Sprintf("run-%s", uid))
if err := os.MkdirAll(tmpDir, 0700); err != nil {
logrus.Debugf("unable to make temp dir %s", tmpDir)
}
st, err := os.Stat(tmpDir)
if err == nil && int(st.Sys().(*syscall.Stat_t).Uid) == os.Geteuid() && st.Mode().Perm() == 0700 {
runtimeDir = tmpDir
}
}
if runtimeDir == "" {
home := os.Getenv("HOME")
if home == "" {
rootlessRuntimeDirError = errors.New("neither XDG_RUNTIME_DIR nor HOME was set non-empty")
return
}
resolvedHome, err := filepath.EvalSymlinks(home)
if err != nil {
rootlessRuntimeDirError = errors.Wrapf(err, "cannot resolve %s", home)
return
}
runtimeDir = filepath.Join(resolvedHome, "rundir")
}
rootlessRuntimeDir = runtimeDir
})
if rootlessRuntimeDirError != nil {
return "", rootlessRuntimeDirError
}
return rootlessRuntimeDir, nil
}
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