Added golangci-lint with most linters disabled

.golangci.yaml

@@ -0,0 +1,81 @@
+# This file contains all available configuration options
+# with their default values.
+
+# options for analysis running
+run:
+  # default concurrency is a available CPU number
+  concurrency: 4
+
+  # timeout for analysis, e.g. 30s, 5m, default is 1m
+  timeout: 1m
+
+  # exit code when at least one issue was found, default is 1
+  issues-exit-code: 1
+
+  # include test files or not, default is true
+  tests: true
+
+  # which dirs to skip: issues from them won't be reported;
+  # can use regexp here: generated.*, regexp is applied on full path;
+  # default value is empty list, but default dirs are skipped independently
+  # from this option's value (see skip-dirs-use-default).
+  # "/" will be replaced by current OS file path separator to properly work
+  # on Windows.
+  skip-dirs:
+    - vendor
+
+  # default is true. Enables skipping of directories:
+  #   vendor$, third_party$, testdata$, examples$, Godeps$, builtin$
+  skip-dirs-use-default: true
+
+  # by default isn't set. If set we pass it to "go list -mod={option}". From "go help modules":
+  # If invoked with -mod=readonly, the go command is disallowed from the implicit
+  # automatic updating of go.mod described above. Instead, it fails when any changes
+  # to go.mod are needed. This setting is most useful to check that go.mod does
+  # not need updates, such as in a continuous integration and testing system.
+  # If invoked with -mod=vendor, the go command assumes that the vendor
+  # directory holds the correct copies of dependencies and ignores
+  # the dependency descriptions in go.mod.
+  modules-download-mode: vendor
+
+  # Allow multiple parallel golangci-lint instances running.
+  # If false (default) - golangci-lint acquires file lock on start.
+  allow-parallel-runners: false
+
+
+# output configuration options
+output:
+  # colored-line-number|line-number|json|tab|checkstyle|code-climate|junit-xml|github-actions
+  # default is "colored-line-number"
+  format: tab
+
+  # print lines of code with issue, default is true
+  print-issued-lines: true
+
+  # print linter name in the end of issue text, default is true
+  print-linter-name: true
+
+  # make issues output unique by line, default is true
+  uniq-by-line: true
+
+  # add a prefix to the output file references; default is no prefix
+  path-prefix: ""
+
+  # sorts results by: filepath, line and column
+  sort-results: false
+
+linters:
+  disable-all: true
+  enable:
+    # - deadcode
+    # - errcheck
+    # - gofmt
+    # - gosimple
+    # - govet
+    - ineffassign
+    # - staticcheck
+    # - structcheck
+    - typecheck
+    # - unused
+    - varcheck
+  fast: false

Makefile

@@ -1,3 +1,7 @@
+BIN_DIR?=./bin
+GOLANGCI_LINT_BIN=$(BIN_DIR)/golangci-lint
+GOLANGCI_LINT_VERSION=v1.40.1
+
 all: build
 .PHONY: all
 
@@ -11,6 +15,7 @@ test:
 
 clean:
 	rm -rf _output/
+	rm -rf bin
 .PHONY: clean
 
 update-codegen-crds:
@@ -21,3 +26,13 @@ verify-codegen-crds:
 verify-codegen: verify-codegen-crds
 verify: verify-codegen
 .PHONY: update-codegen-crds update-codegen verify-codegen-crds verify-codegen verify
+
+
+.PHONY: lint
+## Checks the code with golangci-lint
+lint: $(GOLANGCI_LINT_BIN)
+	$(GOLANGCI_LINT_BIN) run -c .golangci.yaml --deadline=30m
+
+$(GOLANGCI_LINT_BIN):
+	mkdir -p $(BIN_DIR)
+	hack/golangci-lint.sh $(GOLANGCI_LINT_BIN)

hack/golangci-lint.sh

@@ -0,0 +1,37 @@
+#!/bin/sh
+set -e
+
+GOLANGCI_VERSION="1.40.1"
+
+OUTPUT_PATH=${1:-./bin/golangci-lint}
+
+GOOS=$(go env GOOS)
+GOARCH=$(go env GOARCH)
+
+case $GOOS in
+  linux)
+    CHECKSUM="7c133b4b39c0a46cf8d67265da651f169079d137ae71aee9b5934e2281bd18d3"
+    ;;
+  darwin)
+    CHECKSUM="04715fb08566d7342a51352e36a544f246f632ec6bb7f4d7144d6c9e3a2ada7d"
+    ;;
+    *)
+    echo "Unsupported OS $GOOS"
+    exit 1
+    ;;
+esac
+
+if [ "$GOARCH" != "amd64" ]; then
+  echo "Unsupported architecture $GOARCH"
+  exit 1
+fi
+
+TEMPDIR=$(mktemp -d)
+curl --silent --location -o "$TEMPDIR/golangci-lint.tar.gz" "https://github.com/golangci/golangci-lint/releases/download/v$GOLANGCI_VERSION/golangci-lint-$GOLANGCI_VERSION-$GOOS-$GOARCH.tar.gz"
+tar xzf "$TEMPDIR/golangci-lint.tar.gz" --directory="$TEMPDIR"
+
+echo "$CHECKSUM" "$TEMPDIR/golangci-lint.tar.gz" | sha256sum -c --quiet
+
+BIN=$TEMPDIR/golangci-lint-$GOLANGCI_VERSION-$GOOS-$GOARCH/golangci-lint
+mv "$BIN" "$OUTPUT_PATH"
+rm -rf "$TEMPDIR"