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|
// +build linux
package defaults
import (
"io/ioutil"
"os"
"strings"
"testing"
"golang.org/x/sys/unix"
"github.com/rfjakob/gocryptfs/v2/internal/syscallcompat"
"github.com/rfjakob/gocryptfs/v2/tests/test_helpers"
)
// https://github.com/rfjakob/gocryptfs/issues/641
//
// I was trying to run the Docker daemon with the recommended overlay2 storage driver, and encrypt its `/var/lib/docker` directory using gocryptfs. overlay2 was giving me the following errors:
// ```
// Jan 21 19:09:43 friedhelm.rankenste.in kernel: overlayfs: upper fs does not support tmpfile.
// Jan 21 19:09:43 friedhelm.rankenste.in kernel: overlayfs: upper fs does not support RENAME_WHITEOUT.
// Jan 21 19:09:43 friedhelm.rankenste.in kernel: overlayfs: upper fs missing required features.
// ```
func TestRenameWhiteout(t *testing.T) {
short := t.Name() + ".short"
long := t.Name() + strings.Repeat(".long", 200/len(".long"))
names := [][]string{
// short to short
{short + "s2s", short + "s2s2"},
// short to long
{short + "s2l", long + "s2l2"},
// long to short
{long + "l2s", short + "l2s2"},
// long to long
{long + "l2l", short + "l2l2"},
}
for _, flags := range []uint{syscallcompat.RENAME_WHITEOUT, syscallcompat.RENAME_WHITEOUT | syscallcompat.RENAME_NOREPLACE} {
for _, n := range names {
pSrc := test_helpers.DefaultPlainDir + "/" + n[0]
pDst := test_helpers.DefaultPlainDir + "/" + n[1]
if err := ioutil.WriteFile(pSrc, nil, 0200); err != nil {
t.Fatalf("creating empty file failed: %v", err)
}
err := unix.Renameat2(-1, pSrc, -1, pDst, flags)
if err != nil {
t.Error(err)
}
// readdir should not choke on leftover or missing .name files
_, err = os.ReadDir(test_helpers.DefaultPlainDir)
if err != nil {
t.Error(err)
}
// pSrc should now be a character device 0 file
var st unix.Stat_t
err = unix.Stat(pSrc, &st)
if err != nil {
t.Error(err)
}
if !(st.Mode&unix.S_IFMT == unix.S_IFCHR) {
t.Error("not a device file")
}
if st.Rdev != 0 {
t.Errorf("want device 0, have %d", st.Rdev)
}
unix.Unlink(pSrc)
unix.Unlink(pDst)
}
}
}
func TestRenameExchange(t *testing.T) {
short := t.Name() + ".short"
long := t.Name() + strings.Repeat(".long", 200/len(".long"))
names := [][]string{
// short to short
{short + "s2s", short + "s2s2"},
// short to long
{short + "s2l", long + "s2l2"},
// long to short
{long + "l2s", short + "l2s2"},
// long to long
{long + "l2l", short + "l2l2"},
}
for _, n := range names {
pSrc := test_helpers.DefaultPlainDir + "/" + n[0]
pDst := test_helpers.DefaultPlainDir + "/" + n[1]
if err := ioutil.WriteFile(pSrc, nil, 0200); err != nil {
t.Fatalf("creating empty file failed: %v", err)
}
if err := ioutil.WriteFile(pDst, nil, 0200); err != nil {
t.Fatalf("creating empty file failed: %v", err)
}
err := unix.Renameat2(-1, pSrc, -1, pDst, unix.RENAME_EXCHANGE)
if err != nil {
t.Error(err)
}
// readdir should not choke on leftover or missing .name files
_, err = os.ReadDir(test_helpers.DefaultPlainDir)
if err != nil {
t.Error(err)
}
}
}
|
