package syscallcompat import ( "os" "runtime" "syscall" "testing" "golang.org/x/sys/unix" ) func TestEmulateOpenat(t *testing.T) { _, err := emulateOpenat(tmpDirFd, "testOpenAt", 0, 0) if err == nil { t.Errorf("should have failed") } fd, err := os.Create(tmpDir + "/testOpenAt") if err != nil { t.Fatal(err) } fd.Close() rawFd, err := emulateOpenat(tmpDirFd, "testOpenAt", 0, 0) if err != nil { t.Fatal(err) } defer syscall.Close(rawFd) if rawFd < 0 { t.Fatalf("rawFd=%d", rawFd) } // Test with absolute path rawFd, err = emulateOpenat(-1, tmpDir+"/testOpenAt", 0, 0) if err != nil { t.Fatal(err) } defer syscall.Close(rawFd) if rawFd < 0 { t.Fatalf("rawFd=%d", rawFd) } } func TestEmulateRenameat(t *testing.T) { os.Mkdir(tmpDir+"/dir1", 0700) dir1, err := os.Open(tmpDir + "/dir1") if err != nil { t.Fatal(err) } defer dir1.Close() os.Mkdir(tmpDir+"/dir2", 0700) dir2, err := os.Open(tmpDir + "/dir2") if err != nil { t.Fatal(err) } defer dir2.Close() fd, err := os.Create(tmpDir + "/dir1/f1") if err != nil { t.Fatal(err) } fd.Close() err = emulateRenameat(int(dir1.Fd()), "f1", int(dir2.Fd()), "f2") if err != nil { t.Fatal(err) } _, err = os.Stat(tmpDir + "/dir2/f2") if err != nil { t.Fatal(err) } // Test with absolute path err = emulateRenameat(-1, tmpDir+"/dir2/f2", -1, tmpDir+"/dir2/f1") if err != nil { t.Fatal(err) } _, err = os.Stat(tmpDir + "/dir2/f1") if err != nil { t.Fatal(err) } } func TestEmulateUnlinkat(t *testing.T) { os.Mkdir(tmpDir+"/unlink1", 0700) dirfd, err := os.Open(tmpDir + "/unlink1") if err != nil { t.Fatal(err) } defer dirfd.Close() // Try to delete file fd, err := os.Create(tmpDir + "/unlink1/f1") if err != nil { t.Fatal(err) } fd.Close() err = emulateUnlinkat(int(dirfd.Fd()), "f1", 0) if err != nil { t.Fatal(err) } _, err = os.Stat(tmpDir + "/unlink1/f1") if err == nil { t.Fatalf("file not deleted!") } // Try to delete dir err = os.Mkdir(tmpDir+"/unlink1/d1", 0700) if err != nil { t.Fatal(err) } err = emulateUnlinkat(int(dirfd.Fd()), "d1", 0) if err == nil { t.Fatalf("this should fail due to missing AT_REMOVEDIR flag") } err = emulateUnlinkat(int(dirfd.Fd()), "d1", unix.AT_REMOVEDIR) if err != nil { t.Fatal(err) } _, err = os.Stat(tmpDir + "/unlink1/d1") if err == nil { t.Fatalf("dir not deleted!") } // Test with absolute path err = os.Mkdir(tmpDir+"/unlink1/d1", 0700) if err != nil { t.Fatal(err) } err = emulateUnlinkat(-1, tmpDir+"/unlink1/d1", unix.AT_REMOVEDIR) if err != nil { t.Fatal(err) } _, err = os.Stat(tmpDir + "/unlink1/d1") if err == nil { t.Fatalf("dir not deleted!") } } func TestEmulateMknodat(t *testing.T) { err := emulateMknodat(tmpDirFd, "fifo1", unix.S_IFIFO, 0) if err != nil { t.Fatal(err) } _, err = os.Stat(tmpDir + "/fifo1") if err != nil { t.Fatal(err) } // Test with absolute path err = emulateMknodat(-1, tmpDir+"/fifo2", unix.S_IFIFO, 0) if err != nil { t.Fatal(err) } _, err = os.Stat(tmpDir + "/fifo2") if err != nil { t.Fatal(err) } } func TestEmulateFchmodat(t *testing.T) { fd, err := os.Create(tmpDir + "/chmod") if err != nil { t.Fatal(err) } err = fd.Chmod(0654) if err != nil { t.Fatal(err) } fd.Close() // Chmod a normal file err = emulateFchmodat(tmpDirFd, "chmod", 0600, 0) if err != nil { t.Fatal(err) } var st syscall.Stat_t err = syscall.Lstat(tmpDir+"/chmod", &st) if err != nil { t.Fatal(err) } if st.Mode != 0100600 { t.Fatalf("Wrong mode: have %o, want %o", st.Mode, 0100600) } // Chmod a symlink (original file should not change) err = os.Symlink(tmpDir+"/chmod", tmpDir+"/chmodSymlink") if err != nil { t.Fatal(err) } err = emulateFchmodat(tmpDirFd, "chmodSymlink", 0123, unix.AT_SYMLINK_NOFOLLOW) if err != nil { t.Fatal(err) } err = syscall.Lstat(tmpDir+"/chmod", &st) if err != nil { t.Fatal(err) } if st.Mode != 0100600 { t.Fatalf("Wrong mode: have %o, want %o", st.Mode, 0100600) } // Test with absolute path err = emulateFchmodat(-1, tmpDir+"/chmod", 0400, 0) if err != nil { t.Fatal(err) } err = syscall.Lstat(tmpDir+"/chmod", &st) if err != nil { t.Fatal(err) } if st.Mode != 0100400 { t.Fatalf("Wrong mode: have %o, want %o", st.Mode, 0100400) } } func TestEmulateFchownat(t *testing.T) { t.Skipf("TODO") } // symlinkCheckMode looks if the mode bits in "st" say that this is a symlink. // Calls t.Fatal() if not. func symlinkCheckMode(t *testing.T, st syscall.Stat_t) { if runtime.GOOS == "darwin" { // On MacOS, symlinks don't carry their own permissions, so // only check the file type. if st.Mode&syscall.S_IFMT != syscall.S_IFLNK { t.Fatalf("This is not a symlink: mode = 0%o", st.Mode) } return } if st.Mode != 0120777 { t.Fatalf("Wrong mode, have 0%o, want 0120777", st.Mode) } } func TestEmulateSymlinkat(t *testing.T) { err := emulateSymlinkat("/foo/bar/baz", tmpDirFd, "symlink1") if err != nil { t.Fatal(err) } var st syscall.Stat_t err = syscall.Lstat(tmpDir+"/symlink1", &st) if err != nil { t.Fatal(err) } symlinkCheckMode(t, st) // Test with absolute path err = emulateSymlinkat("/foo/bar/baz", -1, tmpDir+"/symlink2") if err != nil { t.Fatal(err) } err = syscall.Lstat(tmpDir+"/symlink2", &st) if err != nil { t.Fatal(err) } symlinkCheckMode(t, st) } func TestEmulateMkdirat(t *testing.T) { err := emulateMkdirat(tmpDirFd, "mkdirat", 0700) if err != nil { t.Fatal(err) } fi, err := os.Stat(tmpDir + "/mkdirat") if err != nil { t.Fatal(err) } if !fi.IsDir() { t.Fatalf("mkdirat did not create a directory") } // Test with absolute path err = emulateMkdirat(-1, tmpDir+"/mkdirat2", 0700) if err != nil { t.Fatal(err) } fi, err = os.Stat(tmpDir + "/mkdirat2") if err != nil { t.Fatal(err) } if !fi.IsDir() { t.Fatalf("mkdirat did not create a directory") } } func TestEmulateFstatat(t *testing.T) { var st unix.Stat_t // stat a normal file (size 3) f, err := os.Create(tmpDir + "/fstatat") if err != nil { t.Fatal(err) } _, err = f.Write([]byte("foo")) if err != nil { t.Fatal(err) } f.Close() err = emulateFstatat(tmpDirFd, "fstatat", &st, unix.AT_SYMLINK_NOFOLLOW) if err != nil { t.Fatal(err) } if st.Size != 3 { t.Errorf("wrong file size: %d", st.Size) } // stat a symlink and check that the size matches the length of the // symlink target. This proves that we have stat'ed the symlink itself. err = os.Symlink(tmpDir+"/fstatat", tmpDir+"/fstatatSymlink") if err != nil { t.Fatal(err) } err = emulateFstatat(tmpDirFd, "fstatatSymlink", &st, unix.AT_SYMLINK_NOFOLLOW) if err != nil { t.Fatal(err) } expectedSize := int64(len(tmpDir + "/fstatat")) if st.Size != expectedSize { t.Errorf("symlink size: expected=%d, got=%d", expectedSize, st.Size) } }