120 lines
3.3 KiB
Go
120 lines
3.3 KiB
Go
// +build linux
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package defaults
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import (
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"io/ioutil"
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"os"
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"strings"
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"testing"
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"golang.org/x/sys/unix"
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"github.com/rfjakob/gocryptfs/v2/internal/syscallcompat"
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"github.com/rfjakob/gocryptfs/v2/tests/test_helpers"
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)
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// https://github.com/rfjakob/gocryptfs/issues/641
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//
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// 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:
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// ```
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// Jan 21 19:09:43 friedhelm.rankenste.in kernel: overlayfs: upper fs does not support tmpfile.
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// Jan 21 19:09:43 friedhelm.rankenste.in kernel: overlayfs: upper fs does not support RENAME_WHITEOUT.
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// Jan 21 19:09:43 friedhelm.rankenste.in kernel: overlayfs: upper fs missing required features.
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// ```
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func TestRenameWhiteout(t *testing.T) {
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short := t.Name() + ".short"
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long := t.Name() + strings.Repeat(".long", 200/len(".long"))
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names := [][]string{
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// short to short
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{short + "s2s", short + "s2s2"},
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// short to long
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{short + "s2l", long + "s2l2"},
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// long to short
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{long + "l2s", short + "l2s2"},
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// long to long
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{long + "l2l", short + "l2l2"},
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}
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for _, flags := range []uint{syscallcompat.RENAME_WHITEOUT, syscallcompat.RENAME_WHITEOUT | syscallcompat.RENAME_NOREPLACE} {
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for _, n := range names {
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pSrc := test_helpers.DefaultPlainDir + "/" + n[0]
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pDst := test_helpers.DefaultPlainDir + "/" + n[1]
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if err := ioutil.WriteFile(pSrc, nil, 0200); err != nil {
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t.Fatalf("creating empty file failed: %v", err)
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}
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err := unix.Renameat2(-1, pSrc, -1, pDst, flags)
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if err != nil {
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t.Error(err)
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}
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// readdir should not choke on leftover or missing .name files
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_, err = os.ReadDir(test_helpers.DefaultPlainDir)
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if err != nil {
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t.Error(err)
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}
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// pSrc should now be a character device 0 file
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var st unix.Stat_t
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err = unix.Stat(pSrc, &st)
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if err != nil {
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t.Error(err)
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}
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if !(st.Mode&unix.S_IFMT == unix.S_IFCHR) {
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t.Error("not a device file")
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}
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if st.Rdev != 0 {
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t.Errorf("want device 0, have %d", st.Rdev)
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}
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unix.Unlink(pSrc)
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unix.Unlink(pDst)
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}
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}
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}
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func TestRenameExchange(t *testing.T) {
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short := t.Name() + ".short"
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long := t.Name() + strings.Repeat(".long", 200/len(".long"))
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names := [][]string{
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// short to short
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{short + "s2s", short + "s2s2"},
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// short to long
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{short + "s2l", long + "s2l2"},
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// long to short
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{long + "l2s", short + "l2s2"},
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// long to long
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{long + "l2l", short + "l2l2"},
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}
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for _, n := range names {
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pSrc := test_helpers.DefaultPlainDir + "/" + n[0]
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pDst := test_helpers.DefaultPlainDir + "/" + n[1]
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if err := ioutil.WriteFile(pSrc, nil, 0200); err != nil {
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t.Fatalf("creating empty file failed: %v", err)
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}
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if err := ioutil.WriteFile(pDst, nil, 0200); err != nil {
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t.Fatalf("creating empty file failed: %v", err)
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}
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err := unix.Renameat2(-1, pSrc, -1, pDst, unix.RENAME_EXCHANGE)
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if err != nil {
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t.Error(err)
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}
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// readdir should not choke on leftover or missing .name files
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_, err = os.ReadDir(test_helpers.DefaultPlainDir)
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if err != nil {
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t.Error(err)
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}
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}
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}
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// Looks like the FUSE protocol does support O_TMPFILE yet
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func TestOTmpfile(t *testing.T) {
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p := test_helpers.DefaultPlainDir + "/" + t.Name()
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fd, err := unix.Openat(-1, p, unix.O_TMPFILE, 0600)
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if err != nil {
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t.Skip(err)
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}
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unix.Close(fd)
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}
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