test: add basic integration tests

Signed-off-by: Justin Chadwell <me@jedevc.com>

vendor/github.com/containerd/continuity/Makefile

@@ -0,0 +1,73 @@
+#   Copyright The containerd Authors.
+
+#   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.
+
+# Set an output prefix, which is the local directory if not specified
+PREFIX?=$(shell pwd)
+
+PKG=github.com/containerd/continuity
+
+PACKAGES=$(shell go list -mod=vendor ./... | grep -v /vendor/)
+TEST_REQUIRES_ROOT_PACKAGES=$(filter \
+    ${PACKAGES}, \
+    $(shell \
+    for f in $$(git grep -l testutil.RequiresRoot | grep -v Makefile); do \
+        d="$$(dirname $$f)"; \
+        [ "$$d" = "." ] && echo "${PKG}" && continue; \
+        echo "${PKG}/$$d"; \
+    done | sort -u) \
+    )
+
+.PHONY: clean all lint build test binaries
+.DEFAULT: default
+
+all: AUTHORS clean lint build test binaries
+
+AUTHORS: .mailmap .git/HEAD
+	 git log --format='%aN <%aE>' | sort -fu > $@
+
+${PREFIX}/bin/continuity:
+	@echo "+ $@"
+	@(cd cmd/continuity && go build -mod=mod -o $@  ${GO_GCFLAGS} .)
+
+generate:
+	go generate -mod=vendor $(PACKAGES)
+
+lint:
+	@echo "+ $@"
+	@golangci-lint run
+
+build:
+	@echo "+ $@"
+	@go build -mod=vendor -v ${GO_LDFLAGS} $(PACKAGES)
+
+test:
+	@echo "+ $@"
+	@go test -mod=vendor $(PACKAGES)
+
+root-test:
+	@echo "+ $@"
+	@go test -exec sudo ${TEST_REQUIRES_ROOT_PACKAGES} -test.root
+
+test-compile:
+	@echo "+ $@"
+	@for pkg in $(PACKAGES); do go test -mod=vendor -c $$pkg; done
+
+binaries: ${PREFIX}/bin/continuity
+	@echo "+ $@"
+	@if [ x$$GOOS = xwindows ]; then echo "+ continuity -> continuity.exe"; mv ${PREFIX}/bin/continuity ${PREFIX}/bin/continuity.exe; fi
+
+clean:
+	@echo "+ $@"
+	@rm -rf "${PREFIX}/bin/continuity" "${PREFIX}/bin/continuity.exe"
+