use CGO to enable fsevent on OSX

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>

Dockerfile

@@ -27,12 +27,16 @@ ARG LICENSE_FILES=".*\(Dockerfile\|Makefile\|\.go\|\.hcl\|\.sh\)"
 # xx is a helper for cross-compilation
 FROM --platform=${BUILDPLATFORM} tonistiigi/xx:${XX_VERSION} AS xx
 
+# osxcross contains the MacOSX cross toolchain for xx
+FROM crazymax/osxcross:11.3-alpine AS osxcross
+
 FROM golangci/golangci-lint:${GOLANGCI_LINT_VERSION}-alpine AS golangci-lint
 FROM ghcr.io/google/addlicense:${ADDLICENSE_VERSION} AS addlicense
 
 FROM --platform=${BUILDPLATFORM} golang:${GO_VERSION}-alpine AS base
 COPY --from=xx / /
 RUN apk add --no-cache \
+      clang \
       docker \
       file \
       findutils \
@@ -73,10 +77,12 @@ EOT
 FROM build-base AS build
 ARG BUILD_TAGS
 ARG TARGETPLATFORM
-RUN xx-go --wrap
 RUN --mount=type=bind,target=. \
     --mount=type=cache,target=/root/.cache \
     --mount=type=cache,target=/go/pkg/mod \
+    --mount=type=bind,from=osxcross,src=/osxsdk,target=/xx-sdk \
+    xx-go --wrap && \
+    if [ "$(xx-info os)" == "darwin" ]; then export CGO_ENABLED=1; fi && \
     make build GO_BUILDTAGS="$BUILD_TAGS" DESTDIR=/usr/bin && \
     xx-verify --static /usr/bin/docker-compose
 

Makefile

@@ -53,7 +53,7 @@ all: build
 
 .PHONY: build ## Build the compose cli-plugin
 build:
-	CGO_ENABLED=0 GO111MODULE=on go build -trimpath -tags "$(GO_BUILDTAGS)" -ldflags "$(GO_LDFLAGS)" -o "$(DESTDIR)/docker-compose$(BINARY_EXT)" ./cmd
+	GO111MODULE=on go build -trimpath -tags "$(GO_BUILDTAGS)" -ldflags "$(GO_LDFLAGS)" -o "$(DESTDIR)/docker-compose$(BINARY_EXT)" ./cmd
 
 .PHONY: binary
 binary:

go.mod

@@ -59,6 +59,7 @@ require (
 	github.com/docker/go v1.5.1-1.0.20160303222718-d30aec9fd63c // indirect
 	github.com/docker/go-metrics v0.0.1 // indirect
 	github.com/felixge/httpsnoop v1.0.2 // indirect
+	github.com/fsnotify/fsevents v0.1.1
 	github.com/fvbommel/sortorder v1.0.2 // indirect
 	github.com/go-logr/logr v1.2.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect

go.sum

@@ -254,6 +254,8 @@ github.com/felixge/httpsnoop v1.0.2/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSw
 github.com/form3tech-oss/jwt-go v3.2.2+incompatible/go.mod h1:pbq4aXjuKjdthFRnoDwaVPLA+WlJuPGy+QneDUgJi2k=
 github.com/form3tech-oss/jwt-go v3.2.3+incompatible/go.mod h1:pbq4aXjuKjdthFRnoDwaVPLA+WlJuPGy+QneDUgJi2k=
 github.com/frankban/quicktest v1.11.3/go.mod h1:wRf/ReqHper53s+kmmSZizM8NamnL3IM0I9ntUbOk+k=
+github.com/fsnotify/fsevents v0.1.1 h1:/125uxJvvoSDDBPen6yUZbil8J9ydKZnnl3TWWmvnkw=
+github.com/fsnotify/fsevents v0.1.1/go.mod h1:+d+hS27T6k5J8CRaPLKFgwKYcpS7GwW3Ule9+SC2ZRc=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
 github.com/fsnotify/fsnotify v1.6.0 h1:n+5WquG0fcWoWp6xPWfHdbskMCQaFnG6PfBrh1Ky4HY=

pkg/watch/notify_test.go

@@ -435,7 +435,7 @@ func TestWatchNonexistentDirectory(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	// for directories that were the root of an Add, we don't report creation, cf. watcher_fsevent.go
+	// for directories that were the root of an Add, we don't report creation, cf. watcher_darwin.go
 	f.assertEvents()
 
 	f.events = nil

pkg/watch/watcher_darwin.go

@@ -19,9 +19,6 @@
 
 package watch
 
-/**
-FIXME this implementation requires CGO
-
 import (
 	"path/filepath"
 	"time"
@@ -130,7 +127,7 @@ func (d *fseventNotify) Errors() chan error {
 	return d.errors
 }
 
-func newFSEventWatcher(paths []string, ignore PathMatcher) (*fseventNotify, error) {
+func newWatcher(paths []string, ignore PathMatcher) (Notify, error) {
 	dw := &fseventNotify{
 		ignore: ignore,
 		stream: &fsevents.EventStream{
@@ -158,4 +155,3 @@ func newFSEventWatcher(paths []string, ignore PathMatcher) (*fseventNotify, erro
 }
 
 var _ Notify = &fseventNotify{}
-**/

pkg/watch/watcher_naive.go

@@ -1,3 +1,6 @@
+//go:build !darwin
+// +build !darwin
+
 /*
    Copyright 2020 Docker Compose CLI authors
 
@@ -294,7 +297,7 @@ func (d *naiveNotify) add(path string) error {
 	return nil
 }
 
-func newWatcher(paths []string, ignore PathMatcher) (*naiveNotify, error) {
+func newWatcher(paths []string, ignore PathMatcher) (Notify, error) {
 	if ignore == nil {
 		return nil, fmt.Errorf("newWatcher: ignore is nil")
 	}