Move metadata package to go modules

Signed-off-by: Marcus Weiner <marcus.weiner@gmail.com>

pkg/metadata/vendor/github.com/diskfs/go-diskfs/Makefile

@@ -0,0 +1,83 @@
+.PHONY: test image unit_test
+
+PACKAGE_NAME?=github.com/diskfs/go-diskfs
+IMAGE ?= diskfs/go-diskfs:build
+GOENV ?= GO111MODULE=on CGO_ENABLED=0
+GO_FILES ?= $(shell $(GOENV) go list ./...)
+GOBIN ?= $(shell go env GOPATH)/bin
+LINTER ?= $(GOBIN)/golangci-lint
+
+
+# BUILDARCH is the host architecture
+# ARCH is the target architecture
+# we need to keep track of them separately
+BUILDARCH ?= $(shell uname -m)
+BUILDOS ?= $(shell uname -s | tr A-Z a-z)
+
+# canonicalized names for host architecture
+ifeq ($(BUILDARCH),aarch64)
+BUILDARCH=arm64
+endif
+ifeq ($(BUILDARCH),x86_64)
+BUILDARCH=amd64
+endif
+
+# unless otherwise set, I am building for my own architecture, i.e. not cross-compiling
+# and for my OS
+ARCH ?= $(BUILDARCH)
+OS ?= $(BUILDOS)
+
+# canonicalized names for target architecture
+ifeq ($(ARCH),aarch64)
+        override ARCH=arm64
+endif
+ifeq ($(ARCH),x86_64)
+    override ARCH=amd64
+endif
+
+BUILD_CMD = CGO_ENABLED=0 GOOS=$(OS) GOARCH=$(ARCH)
+ifdef DOCKERBUILD
+BUILD_CMD = docker run --rm \
+                -e GOARCH=$(ARCH) \
+                -e GOOS=linux \
+                -e CGO_ENABLED=0 \
+                -v $(CURDIR):/go/src/$(PACKAGE_NAME) \
+                -w /go/src/$(PACKAGE_NAME) \
+                $(BUILDER_IMAGE)
+endif
+
+image:
+	docker build -t $(IMAGE) testhelper/docker
+
+# because we keep making the same typo
+unit-test: unit_test
+unit_test:
+	@$(GOENV) go test $(GO_FILES)
+
+test: image
+	TEST_IMAGE=$(IMAGE) $(GOENV) go test $(GO_FILES)
+
+golangci-lint: $(LINTER)
+$(LINTER):
+	$(GOENV) go get github.com/golangci/golangci-lint/cmd/golangci-lint@v1.17.1
+
+
+## Check the file format
+fmt-check:
+	@if [ -n "$(shell $(BUILD_CMD) gofmt -l ${GO_FILES})" ]; then \
+	  $(BUILD_CMD) gofmt -s -e -d ${GO_FILES}; \
+	  exit 1; \
+	fi
+
+## Lint the files
+lint: golint golangci-lint
+	@$(BUILD_CMD) $(LINTER) run --disable-all --enable=golint ./...
+
+golint:
+ifeq (, $(shell which golint))
+	go get -u golang.org/x/lint/golint
+endif
+
+## Vet the files
+vet:
+	@$(BUILD_CMD) go vet ${GO_FILES}