update to Go 1.18

.golangci.yml

@@ -0,0 +1,37 @@
+run:
+  timeout: 10m
+
+linters:
+  enable:
+    - deadcode
+    - depguard
+    - gofmt
+    - goimports
+    - revive
+    - govet
+    - importas
+    - ineffassign
+    - misspell
+    - typecheck
+    - varcheck
+    - errname
+    - makezero
+    - whitespace
+  disable-all: true
+
+linters-settings:
+  depguard:
+    list-type: blacklist
+    include-go-root: true
+    packages:
+      # The io/ioutil package has been deprecated.
+      # https://go.dev/doc/go1.16#ioutil
+      - io/ioutil
+  importas:
+    no-unaliased: true
+
+issues:
+  exclude-rules:
+    - linters:
+        - revive
+      text: "stutters"

Dockerfile

@@ -0,0 +1,86 @@
+# syntax=docker/dockerfile:1
+
+# Copyright 2021 cli-docs-tool 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.
+
+ARG GO_VERSION="1.18"
+ARG GOLANGCI_LINT_VERSION="v1.45"
+ARG ADDLICENSE_VERSION="v1.0.0"
+
+ARG LICENSE_ARGS="-c cli-docs-tool -l apache"
+ARG LICENSE_FILES=".*\(Dockerfile\|\.go\|\.hcl\|\.sh\)"
+
+FROM golangci/golangci-lint:${GOLANGCI_LINT_VERSION}-alpine AS golangci-lint
+FROM ghcr.io/google/addlicense:${ADDLICENSE_VERSION} AS addlicense
+
+FROM golang:${GO_VERSION}-alpine AS base
+RUN apk add --no-cache cpio findutils git linux-headers
+ENV CGO_ENABLED=0
+WORKDIR /src
+
+FROM base AS vendored
+RUN --mount=type=bind,target=.,rw \
+  --mount=type=cache,target=/go/pkg/mod \
+  go mod tidy && go mod download && \
+  mkdir /out && cp go.mod go.sum /out
+
+FROM scratch AS vendor-update
+COPY --from=vendored /out /
+
+FROM vendored AS vendor-validate
+RUN --mount=type=bind,target=.,rw <<EOT
+set -e
+git add -A
+cp -rf /out/* .
+diff=$(git status --porcelain -- go.mod go.sum)
+if [ -n "$diff" ]; then
+  echo >&2 'ERROR: Vendor result differs. Please vendor your package with "docker buildx bake vendor"'
+  echo "$diff"
+  exit 1
+fi
+EOT
+
+FROM base AS lint
+RUN --mount=type=bind,target=. \
+  --mount=type=cache,target=/root/.cache \
+  --mount=from=golangci-lint,source=/usr/bin/golangci-lint,target=/usr/bin/golangci-lint \
+  golangci-lint run ./...
+
+FROM base AS license-set
+ARG LICENSE_ARGS
+ARG LICENSE_FILES
+RUN --mount=type=bind,target=.,rw \
+  --mount=from=addlicense,source=/app/addlicense,target=/usr/bin/addlicense \
+  find . -regex "${LICENSE_FILES}" | xargs addlicense ${LICENSE_ARGS} \
+  && mkdir /out \
+  && find . -regex "${LICENSE_FILES}" | cpio -pdm /out
+
+FROM scratch AS license-update
+COPY --from=set /out /
+
+FROM base AS license-validate
+ARG LICENSE_ARGS
+ARG LICENSE_FILES
+RUN --mount=type=bind,target=. \
+  --mount=from=addlicense,source=/app/addlicense,target=/usr/bin/addlicense \
+  find . -regex "${LICENSE_FILES}" | xargs addlicense -check ${LICENSE_ARGS}
+
+FROM vendored AS test
+RUN --mount=type=bind,target=. \
+  --mount=type=cache,target=/root/.cache \
+  --mount=type=cache,target=/go/pkg/mod \
+  go test -v -coverprofile=/tmp/coverage.txt -covermode=atomic ./...
+
+FROM scratch AS test-coverage
+COPY --from=test /tmp/coverage.txt /coverage.txt

docker-bake.hcl

@@ -12,10 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-variable "GO_VERSION" {
-  default = "1.16"
-}
-
 group "default" {
   targets = ["test"]
 }
@@ -25,49 +21,31 @@ group "validate" {
 }
 
 target "lint" {
-  args = {
-    GO_VERSION = GO_VERSION
-  }
-  dockerfile = "./hack/lint.Dockerfile"
   target = "lint"
   output = ["type=cacheonly"]
 }
 
 target "vendor-validate" {
-  args = {
-    GO_VERSION = GO_VERSION
-  }
-  dockerfile = "./hack/vendor.Dockerfile"
-  target = "validate"
+  target = "vendor-validate"
   output = ["type=cacheonly"]
 }
 
 target "vendor-update" {
-  args = {
-    GO_VERSION = GO_VERSION
-  }
-  dockerfile = "./hack/vendor.Dockerfile"
-  target = "update"
+  target = "vendor-update"
   output = ["."]
 }
 
 target "test" {
-  args = {
-    GO_VERSION = GO_VERSION
-  }
-  dockerfile = "./hack/test.Dockerfile"
   target = "test-coverage"
   output = ["."]
 }
 
 target "license-validate" {
-  dockerfile = "./hack/license.Dockerfile"
-  target = "validate"
+  target = "license-validate"
   output = ["type=cacheonly"]
 }
 
 target "license-update" {
-  dockerfile = "./hack/license.Dockerfile"
-  target = "update"
+  target = "license-update"
   output = ["."]
 }

go.mod

@@ -1,10 +1,17 @@
 module github.com/docker/cli-docs-tool
 
-go 1.16
+go 1.18
 
 require (
 	github.com/spf13/cobra v1.2.1
 	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.7.0
 	gopkg.in/yaml.v2 v2.4.0
 )
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
+)