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package root_test
import (
"os"
"os/exec"
"path/filepath"
"syscall"
"testing"
"github.com/rfjakob/gocryptfs/v2/internal/syscallcompat"
"github.com/rfjakob/gocryptfs/v2/tests/test_helpers"
)
// createBtrfsImage creates a btrfs image file, formats it, and mounts it.
// Returns the mount path and a cleanup function.
func createBtrfsImage(t *testing.T) (mnt string, cleanup func()) {
t.Helper()
if os.Getuid() != 0 {
t.Skip("must run as root")
}
_, err := exec.LookPath("mkfs.btrfs")
if err != nil {
t.Skip("mkfs.btrfs not found, skipping test")
}
img := filepath.Join(test_helpers.TmpDir, t.Name()+".img")
f, err := os.Create(img)
if err != nil {
t.Fatal(err)
}
defer f.Close()
// minimum size for each btrfs device is 114294784
err = f.Truncate(200 * 1024 * 1024)
if err != nil {
t.Fatal(err)
}
// Format as Btrfs
cmd := exec.Command("mkfs.btrfs", img)
out, err := cmd.CombinedOutput()
if err != nil {
t.Logf("%q", cmd.Args)
t.Log(string(out))
t.Fatal(err)
}
// Mount
mnt = img + ".mnt"
err = os.Mkdir(mnt, 0600)
if err != nil {
t.Fatal(err)
}
cmd = exec.Command("mount", img, mnt)
out, err = cmd.CombinedOutput()
if err != nil {
t.Log(string(out))
t.Fatal(err)
}
cleanup = func() {
syscall.Unmount(mnt, 0)
syscall.Unlink(img)
}
return mnt, cleanup
}
// TestBtrfsQuirks needs root permissions because it creates a loop disk
func TestBtrfsQuirks(t *testing.T) {
mnt, cleanup := createBtrfsImage(t)
defer cleanup()
quirk := syscallcompat.DetectQuirks(mnt)
if quirk != syscallcompat.QuirkBtrfsBrokenFalloc {
t.Errorf("wrong quirk: %v", quirk)
}
}
// TestBtrfsQuirksNoCow verifies that when the backing directory has
// the NOCOW attribute (chattr +C), the QuirkBtrfsBrokenFalloc quirk
// is NOT set, because fallocate works correctly with NOCOW.
func TestBtrfsQuirksNoCow(t *testing.T) {
mnt, cleanup := createBtrfsImage(t)
defer cleanup()
_, err := exec.LookPath("chattr")
if err != nil {
t.Skip("chattr not found, skipping test")
}
// Create a subdirectory with NOCOW attribute
nocowDir := filepath.Join(mnt, "nocow")
err = os.Mkdir(nocowDir, 0700)
if err != nil {
t.Fatal(err)
}
cmd := exec.Command("chattr", "+C", nocowDir)
out, err := cmd.CombinedOutput()
if err != nil {
t.Log(string(out))
t.Fatal(err)
}
quirk := syscallcompat.DetectQuirks(nocowDir)
if quirk&syscallcompat.QuirkBtrfsBrokenFalloc != 0 {
t.Errorf("QuirkBtrfsBrokenFalloc should not be set on NOCOW directory, got quirks: %v", quirk)
}
}
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