Add stub implementations to make buildkitd build for Darwin

Signed-off-by: Marat Radchenko <marat@slonopotamus.org>

.github/workflows/test-os.yml

@@ -33,6 +33,7 @@ jobs:
         platform:
           - windows/amd64
           - freebsd/amd64
+          - darwin/arm64
     steps:
       -
         name: Prepare

Dockerfile

@@ -175,6 +175,7 @@ COPY --link --from=buildctl /usr/bin/buildctl /
 COPY --link --from=buildkitd /usr/bin/buildkitd /
 
 FROM scratch AS binaries-darwin
+COPY --link --from=buildkitd /usr/bin/buildkitd /
 COPY --link --from=buildctl /usr/bin/buildctl /
 
 FROM scratch AS binaries-windows

cmd/buildkitd/main_containerd_worker.go

@@ -1,6 +1,3 @@
-//go:build linux || windows || freebsd
-// +build linux windows freebsd
-
 package main
 
 import (

executor/oci/spec_darwin.go

@@ -0,0 +1,64 @@
+package oci
+
+import (
+	"github.com/containerd/containerd/mount"
+	"github.com/containerd/containerd/oci"
+	"github.com/containerd/continuity/fs"
+	"github.com/docker/docker/pkg/idtools"
+	"github.com/moby/buildkit/solver/pb"
+	"github.com/opencontainers/runtime-spec/specs-go"
+	"github.com/pkg/errors"
+)
+
+func withProcessArgs(args ...string) oci.SpecOpts {
+	return oci.WithProcessArgs(args...)
+}
+
+func generateMountOpts(_, _ string) []oci.SpecOpts {
+	return nil
+}
+
+func generateSecurityOpts(mode pb.SecurityMode, _ string, _ bool) ([]oci.SpecOpts, error) {
+	return nil, nil
+}
+
+func generateProcessModeOpts(mode ProcessMode) ([]oci.SpecOpts, error) {
+	return nil, nil
+}
+
+func generateIDmapOpts(idmap *idtools.IdentityMapping) ([]oci.SpecOpts, error) {
+	if idmap == nil {
+		return nil, nil
+	}
+	return nil, errors.New("no support for IdentityMapping on Darwin")
+}
+
+func generateRlimitOpts(ulimits []*pb.Ulimit) ([]oci.SpecOpts, error) {
+	if len(ulimits) == 0 {
+		return nil, nil
+	}
+	return nil, errors.New("no support for POSIXRlimit on Darwin")
+}
+
+// tracing is not implemented on Darwin
+func getTracingSocketMount(_ string) *specs.Mount {
+	return nil
+}
+
+// tracing is not implemented on Darwin
+func getTracingSocket() string {
+	return ""
+}
+
+func cgroupV2NamespaceSupported() bool {
+	return false
+}
+
+func sub(m mount.Mount, subPath string) (mount.Mount, func() error, error) {
+	src, err := fs.RootPath(m.Source, subPath)
+	if err != nil {
+		return mount.Mount{}, nil, err
+	}
+	m.Source = src
+	return m, func() error { return nil }, nil
+}

snapshot/localmounter_darwin.go

@@ -0,0 +1,67 @@
+package snapshot
+
+import (
+	"os"
+
+	"github.com/containerd/containerd/mount"
+	"github.com/pkg/errors"
+	"golang.org/x/sys/unix"
+)
+
+func (lm *localMounter) Mount() (string, error) {
+	lm.mu.Lock()
+	defer lm.mu.Unlock()
+
+	if lm.mounts == nil && lm.mountable != nil {
+		mounts, release, err := lm.mountable.Mount()
+		if err != nil {
+			return "", err
+		}
+		lm.mounts = mounts
+		lm.release = release
+	}
+
+	if len(lm.mounts) == 1 && lm.mounts[0].Type == "bind" {
+		ro := false
+		for _, opt := range lm.mounts[0].Options {
+			if opt == "ro" {
+				ro = true
+				break
+			}
+		}
+		if !ro {
+			return lm.mounts[0].Source, nil
+		}
+	}
+
+	dir, err := os.MkdirTemp("", "buildkit-mount")
+	if err != nil {
+		return "", errors.Wrap(err, "failed to create temp dir")
+	}
+
+	if err := mount.All(lm.mounts, dir); err != nil {
+		os.RemoveAll(dir)
+		return "", errors.Wrapf(err, "failed to mount %s: %+v", dir, lm.mounts)
+	}
+	lm.target = dir
+	return dir, nil
+}
+
+func (lm *localMounter) Unmount() error {
+	lm.mu.Lock()
+	defer lm.mu.Unlock()
+
+	if lm.target != "" {
+		if err := mount.UnmountRecursive(lm.target, unix.MNT_FORCE); err != nil {
+			return err
+		}
+		os.RemoveAll(lm.target)
+		lm.target = ""
+	}
+
+	if lm.release != nil {
+		return lm.release()
+	}
+
+	return nil
+}

source/git/source_darwin.go

@@ -0,0 +1,12 @@
+package git
+
+import (
+	"context"
+	"errors"
+	"os/exec"
+	"runtime"
+)
+
+func runWithStandardUmask(_ context.Context, _ *exec.Cmd) error {
+	return errors.New("runWithStandardUmask not supported on " + runtime.GOOS)
+}

util/network/netproviders/network_nobridge.go

@@ -1,5 +1,5 @@
-//go:build freebsd || windows
-// +build freebsd windows
+//go:build !linux
+// +build !linux
 
 package netproviders