libgocryptfs/internal/syscallcompat/sys_common_test.go

package syscallcompat

import (
	"bytes"
	"syscall"
	"testing"
)

func TestReadlinkat(t *testing.T) {
	for _, targetLen := range []int{100, 500, 4000} {
		target := string(bytes.Repeat([]byte("x"), targetLen))
		err := syscall.Symlink(target, tmpDir+"/readlinkat")
		if err != nil {
			if targetLen > 1000 {
				// Symlinks longer than 1024 (?) bytes are not supported on
				// MacOS and XFS
				t.Logf("skipping targetLen=%d: %v", targetLen, err)
				continue
			}
			t.Fatalf("targetLen=%d: %v", targetLen, err)
		}
		target2, err := Readlinkat(tmpDirFd, "readlinkat")
		if err != nil {
			t.Fatal(err)
		}
		if target != target2 {
			t.Errorf("target=%q != target2=%q", target, target2)
		}
		err = syscall.Unlink(tmpDir + "/readlinkat")
		if err != nil {
			t.Fatal(err)
		}
	}
}