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package matrix
import (
"os"
"testing"
"golang.org/x/sys/unix"
"github.com/rfjakob/gocryptfs/v2/tests/test_helpers"
)
// TestOpenSymlink only works on Linux because is uses
// O_PATH and AT_EMPTY_PATH. These do not exist on MacOS.
func TestOpenSymlinkLinux(t *testing.T) {
path := test_helpers.DefaultPlainDir + "/TestOpenSymlink"
target := "/target/does/not/exist"
err := os.Symlink(target, path)
if err != nil {
t.Fatal(err)
}
how := unix.OpenHow{
Flags: unix.O_PATH | unix.O_NOFOLLOW,
}
fd, err := unix.Openat2(unix.AT_FDCWD, path, &how)
if err != nil {
t.Fatal(err)
}
defer unix.Close(fd)
var st unix.Stat_t
if err := unix.Fstatat(fd, "", &st, unix.AT_EMPTY_PATH); err != nil {
t.Fatal(err)
}
if st.Size != int64(len(target)) {
t.Errorf("wrong size: have=%d want=%d", st.Size, len(target))
}
if err := unix.Unlink(path); err != nil {
t.Fatal(err)
}
if err = unix.Fstatat(fd, "", &st, unix.AT_EMPTY_PATH); err != nil {
// That's a bug, but I have never heard of a use case that would break because of this.
// Also I don't see how to fix it, as gocryptfs does not get informed about the earlier
// Openat2().
t.Logf("posix compliance issue: deleted symlink cannot be accessed: Fstatat: %v", err)
}
}
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