local: fix mac issues in bazel (#1893)

disk-mapper/internal/setup/BUILD.bazel

@@ -5,6 +5,8 @@ go_library(
     name = "setup",
     srcs = [
         "interface.go",
+        "mount_cross.go",
+        "mount_linux.go",
         "setup.go",
     ],
     importpath = "github.com/edgelesssys/constellation/v2/disk-mapper/internal/setup",

disk-mapper/internal/setup/interface.go

@@ -9,7 +9,6 @@ package setup
 import (
 	"io/fs"
 	"os"
-	"syscall"
 
 	"github.com/edgelesssys/constellation/v2/internal/cloud/metadata"
 )
@@ -49,16 +48,6 @@ type RecoveryDoer interface {
 // DiskMounter uses the syscall package to mount disks.
 type DiskMounter struct{}
 
-// Mount performs a mount syscall.
-func (m DiskMounter) Mount(source string, target string, fstype string, flags uintptr, data string) error {
-	return syscall.Mount(source, target, fstype, flags, data)
-}
-
-// Unmount performs an unmount syscall.
-func (m DiskMounter) Unmount(target string, flags int) error {
-	return syscall.Unmount(target, flags)
-}
-
 // MkdirAll uses os.MkdirAll to create the directory.
 func (m DiskMounter) MkdirAll(path string, perm fs.FileMode) error {
 	return os.MkdirAll(path, perm)

disk-mapper/internal/setup/mount_cross.go

@@ -0,0 +1,22 @@
+//go:build !linux
+
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+package setup
+
+import (
+	"errors"
+)
+
+// Mount performs a mount syscall.
+func (m DiskMounter) Mount(_ string, _ string, _ string, _ uintptr, _ string) error {
+	return errors.New("mount not implemented on this platform")
+}
+
+// Unmount performs an unmount syscall.
+func (m DiskMounter) Unmount(_ string, _ int) error {
+	return errors.New("mount not implemented on this platform")
+}

disk-mapper/internal/setup/mount_linux.go

@@ -0,0 +1,22 @@
+//go:build linux
+
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+package setup
+
+import (
+	"syscall"
+)
+
+// Mount performs a mount syscall.
+func (m DiskMounter) Mount(source string, target string, fstype string, flags uintptr, data string) error {
+	return syscall.Mount(source, target, fstype, flags, data)
+}
+
+// Unmount performs an unmount syscall.
+func (m DiskMounter) Unmount(target string, flags int) error {
+	return syscall.Unmount(target, flags)
+}

disk-mapper/internal/setup/setup.go

@@ -44,6 +44,7 @@ const (
 	stateDiskMountPath  = "/var/run/state"
 	cryptsetupOptions   = "cipher=aes-xts-plain64,integrity=hmac-sha256"
 	stateInfoPath       = stateDiskMountPath + "/constellation/node_state.json"
+	msrdonly            = 0x1 // same as syscall.MS_RDONLY
 )
 
 // Manager handles formatting, mapping, mounting and unmounting of state disks.
@@ -95,7 +96,7 @@ func (s *Manager) PrepareExistingDisk(recover RecoveryDoer) error {
 	}
 
 	// we do not care about cleaning up the mount point on error, since any errors returned here should cause a boot failure
-	if err := s.mounter.Mount(filepath.Join("/dev/mapper/", stateDiskMappedName), stateDiskMountPath, "ext4", syscall.MS_RDONLY, ""); err != nil {
+	if err := s.mounter.Mount(filepath.Join("/dev/mapper/", stateDiskMappedName), stateDiskMountPath, "ext4", msrdonly, ""); err != nil {
 		return err
 	}
 

disk-mapper/internal/test/benchmark_test.go

@@ -1,4 +1,4 @@
-//go:build integration && cgo
+//go:build integration && cgo && linux
 
 /*
 Copyright (c) Edgeless Systems GmbH