Add FreeBSD support

.gitignore

@@ -3,3 +3,4 @@
 /umoci.cov*
 /.cache
 /release
+*.swp

Dockerfile

@@ -45,7 +45,8 @@ RUN zypper -n in \
 		python-xattr \
 		runc \
 		skopeo \
-		tar
+		tar \
+		which
 RUN useradd -u 1000 -m -d /home/rootless -s /bin/bash rootless
 
 ENV GOPATH=/go PATH=/go/bin:$PATH

Makefile

@@ -14,11 +14,13 @@
 # limitations under the License.
 
 # Use bash, so that we can do process substitution.
-SHELL = /bin/bash
+SHELL := $(shell which bash)
 
 # Go tools.
 GO ?= go
 GO_MD2MAN ?= go-md2man
+GOOS ?= $(shell go env GOOS)
+GOARCH ?= $(shell go env GOARCH)
 export GO111MODULE=on
 
 # Set up the ... lovely ... GOPATH hacks.
@@ -68,13 +70,20 @@ BASE_FLAGS := ${BUILD_FLAGS} -tags "${BUILDTAGS}"
 BASE_LDFLAGS := -s -w -X ${PROJECT}.gitCommit=${COMMIT} -X ${PROJECT}.version=${VERSION}
 
 # Specific build flags for build type.
-DYN_BUILD_FLAGS := ${BASE_FLAGS} -buildmode=pie -ldflags "${BASE_LDFLAGS}"
-TEST_BUILD_FLAGS := ${BASE_FLAGS} -buildmode=pie -ldflags "${BASE_LDFLAGS} -X ${PROJECT}/pkg/testutils.binaryType=test"
+ifeq ($(GOOS), linux)
+	TEST_BUILD_FLAGS := ${BASE_FLAGS} -buildmode=pie -ldflags "${BASE_LDFLAGS} -X ${PROJECT}/pkg/testutils.binaryType=test"		   DYN_BUILD_FLAGS := ${BASE_FLAGS} -buildmode=pie -ldflags "${BASE_LDFLAGS}"
+	TEST_BUILD_FLAGS := ${BASE_FLAGS} -buildmode=pie -ldflags "${BASE_LDFLAGS} -X ${PROJECT}/pkg/testutils.binaryType=test"
+else
+	DYN_BUILD_FLAGS := ${BASE_FLAGS} -ldflags "${BASE_LDFLAGS}"
+	TEST_BUILD_FLAGS := ${BASE_FLAGS} -ldflags "${BASE_LDFLAGS} -X ${PROJECT}/pkg/testutils.binaryType=test"
+endif
+
+
 STATIC_BUILD_FLAGS := ${BASE_FLAGS} -ldflags "${BASE_LDFLAGS} -extldflags '-static'"
 
 # Installation directories.
 DESTDIR ?=
-PREFIX ?=/usr
+PREFIX ?=/usr/local
 BINDIR ?=$(PREFIX)/bin
 MANDIR ?=$(PREFIX)/share/man
 
@@ -85,7 +94,7 @@ GO_SRC = $(shell find . -type f -name '*.go')
 # NOTE: If you change these make sure you also update local-validate-build.
 
 umoci: $(GO_SRC)
-	$(GO) build ${DYN_BUILD_FLAGS} -o $(BUILD_DIR)/$@ ${CMD}
+	GOOS=$(GOOS) GOARCH=$(GOARCH) $(GO) build ${DYN_BUILD_FLAGS} -o $(BUILD_DIR)/$@ ${CMD}
 
 umoci.static: $(GO_SRC)
 	env CGO_ENABLED=0 $(GO) build ${STATIC_BUILD_FLAGS} -o $(BUILD_DIR)/$@ ${CMD}

oci/layer/generate_linux_test.go

@@ -11,6 +11,7 @@ import (
 	"testing"
 
 	"github.com/opencontainers/umoci/pkg/fseval"
+	"github.com/opencontainers/umoci/pkg/system"
 	"github.com/stretchr/testify/assert"
 	"github.com/vbatts/go-mtree"
 	"golang.org/x/sys/unix"
@@ -32,7 +33,7 @@ func TestInsertLayerTranslateOverlayWhiteouts(t *testing.T) {
 	}
 
 	testNode := path.Join(dir, "test")
-	err = unix.Mknod(testNode, unix.S_IFCHR|0666, int(unix.Mkdev(0, 0)))
+	err = system.Mknod(testNode, unix.S_IFCHR|0666, unix.Mkdev(0, 0))
 	assert.NoError(err)
 
 	packOptions := RepackOptions{TranslateOverlayWhiteouts: true}
@@ -69,7 +70,7 @@ func TestGenerateLayerTranslateOverlayWhiteouts(t *testing.T) {
 	}
 
 	testNode := path.Join(dir, "test")
-	err = unix.Mknod(testNode, unix.S_IFCHR|0666, int(unix.Mkdev(0, 0)))
+	err = system.Mknod(testNode, unix.S_IFCHR|0666, unix.Mkdev(0, 0))
 	assert.NoError(err)
 
 	packOptions := RepackOptions{TranslateOverlayWhiteouts: true}

oci/layer/tar_extract_linux_test.go

@@ -26,12 +26,13 @@ import (
 	"path/filepath"
 	"testing"
 
+	"github.com/opencontainers/umoci/pkg/system"
 	"golang.org/x/sys/unix"
 )
 
 func canMknod(dir string) (bool, error) {
 	testNode := filepath.Join(dir, "test")
-	err := unix.Mknod(testNode, unix.S_IFCHR|0666, int(unix.Mkdev(0, 0)))
+	err := system.Mknod(testNode, unix.S_IFCHR|0666, unix.Mkdev(0, 0))
 	if err != nil {
 		if os.IsPermission(err) {
 			return false, nil

pkg/fseval/fseval_default.go

@@ -105,7 +105,7 @@ func (fs osFsEval) RemoveAll(path string) error {
 
 // Mknod is equivalent to unix.Mknod.
 func (fs osFsEval) Mknod(path string, mode os.FileMode, dev uint64) error {
-	return unix.Mknod(path, uint32(mode), int(dev))
+	return system.Mknod(path, uint32(mode), dev)
 }
 
 // MkdirAll is equivalent to os.MkdirAll.

pkg/system/mknod_freebsd.go

@@ -0,0 +1,28 @@
+/*
+ * umoci: Umoci Modifies Open Containers' Images
+ * Copyright (C) 2016-2020 SUSE LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package system
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+// Mknod creates a filesystem node (file, device special file or named pipe) named path
+// with attributes specified by mode and dev.
+func Mknod(path string, mode uint32, dev uint64) error {
+	return unix.Mknod(path, mode, dev)
+}

pkg/system/mknod_unix.go

@@ -1,3 +1,5 @@
+// +build !freebsd
+
 /*
  * umoci: Umoci Modifies Open Containers' Images
  * Copyright (C) 2016-2020 SUSE LLC
@@ -18,26 +20,11 @@
 package system
 
 import (
-	"archive/tar"
-
 	"golang.org/x/sys/unix"
 )
 
-// Tarmode takes a Typeflag (from a tar.Header for example) and returns the
-// corresponding os.Filemode bit. Unknown typeflags are treated like regular
-// files.
-func Tarmode(typeflag byte) uint32 {
-	switch typeflag {
-	case tar.TypeSymlink:
-		return unix.S_IFLNK
-	case tar.TypeChar:
-		return unix.S_IFCHR
-	case tar.TypeBlock:
-		return unix.S_IFBLK
-	case tar.TypeFifo:
-		return unix.S_IFIFO
-	case tar.TypeDir:
-		return unix.S_IFDIR
-	}
-	return 0
+// Mknod creates a filesystem node (file, device special file or named pipe) named path
+// with attributes specified by mode and dev.
+func Mknod(path string, mode uint32, dev uint64) error {
+	return unix.Mknod(path, mode, int(dev))
 }

pkg/system/tarmode_unix.go

@@ -0,0 +1,43 @@
+/*
+ * umoci: Umoci Modifies Open Containers' Images
+ * Copyright (C) 2016-2020 SUSE LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package system
+
+import (
+	"archive/tar"
+
+	"golang.org/x/sys/unix"
+)
+
+// Tarmode takes a Typeflag (from a tar.Header for example) and returns the
+// corresponding os.Filemode bit. Unknown typeflags are treated like regular
+// files.
+func Tarmode(typeflag byte) uint32 {
+	switch typeflag {
+	case tar.TypeSymlink:
+		return unix.S_IFLNK
+	case tar.TypeChar:
+		return unix.S_IFCHR
+	case tar.TypeBlock:
+		return unix.S_IFBLK
+	case tar.TypeFifo:
+		return unix.S_IFIFO
+	case tar.TypeDir:
+		return unix.S_IFDIR
+	}
+	return 0
+}

pkg/unpriv/unpriv.go

@@ -451,7 +451,7 @@ func MkdirAll(path string, perm os.FileMode) error {
 // required access bits to modify or resolve the path.
 func Mknod(path string, mode os.FileMode, dev uint64) error {
 	return errors.Wrap(Wrap(path, func(path string) error {
-		return unix.Mknod(path, uint32(mode), int(dev))
+		return system.Mknod(path, uint32(mode), dev)
 	}), "unpriv.mknod")
 }