refactor: add more linters and fix findings (#195)

.drone.yml

@@ -8,7 +8,7 @@ platform:
 
 steps:
   - name: deps
-    image: golang:1.19
+    image: golang:1.20
     commands:
       - make deps
     volumes:
@@ -16,7 +16,7 @@ steps:
         path: /go
 
   - name: lint
-    image: golang:1.19
+    image: golang:1.20
     commands:
       - make lint
     volumes:
@@ -24,7 +24,7 @@ steps:
         path: /go
 
   - name: test
-    image: golang:1.19
+    image: golang:1.20
     commands:
       - make test
     volumes:
@@ -51,7 +51,7 @@ platform:
 
 steps:
   - name: build
-    image: techknowlogick/xgo:go-1.19.x
+    image: techknowlogick/xgo:go-1.20.x
     commands:
       - ln -s /drone/src /source
       - make release
@@ -286,6 +286,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: 5e54d2041c971a61b9545f50d3eb303541de10ef02f6ecf9f5043c49e2827657
+hmac: 99430572409aea6256230c2812e815fc98a8f5bba518455a4472f981817eba77
 
 ...

.golangci.yml

@@ -1,25 +1,92 @@
 linters:
-  enable:
-    - gosimple
-    - deadcode
-    - typecheck
-    - govet
-    - errcheck
-    - staticcheck
-    - unused
-    - structcheck
-    - varcheck
-    - dupl
-    - gofmt
-    - misspell
-    - gocritic
-    - bidichk
-    - ineffassign
-    - revive
-    - gofumpt
-    - depguard
   enable-all: false
   disable-all: true
+  enable:
+    - errcheck
+    - gosimple
+    - govet
+    - ineffassign
+    - staticcheck
+    - typecheck
+    - unused
+    - asasalint
+    - asciicheck
+    - bidichk
+    - bodyclose
+    - containedctx
+    - contextcheck
+    - decorder
+    - depguard
+    - dogsled
+    - dupl
+    - dupword
+    - durationcheck
+    - errchkjson
+    - errname
+    - errorlint
+    - execinquery
+    - exhaustive
+    - exportloopref
+    - forcetypeassert
+    - ginkgolinter
+    - gocheckcompilerdirectives
+    - gochecknoglobals
+    - gochecknoinits
+    - gocognit
+    - goconst
+    - gocritic
+    - gocyclo
+    - godot
+    - godox
+    - goerr113
+    - gofmt
+    - gofumpt
+    - goheader
+    - goimports
+    - gomnd
+    - gomoddirectives
+    - gomodguard
+    - goprintffuncname
+    - gosec
+    - grouper
+    - importas
+    - interfacebloat
+    - ireturn
+    - lll
+    - loggercheck
+    - maintidx
+    - makezero
+    - misspell
+    - musttag
+    - nakedret
+    - nestif
+    - nilerr
+    - nilnil
+    - nlreturn
+    - noctx
+    - nolintlint
+    - nonamedreturns
+    - nosprintfhostport
+    - prealloc
+    - predeclared
+    - promlinter
+    - reassign
+    - revive
+    # - rowserrcheck
+    # - sqlclosecheck
+    # - structcheck
+    - stylecheck
+    - tagliatelle
+    - tenv
+    - testableexamples
+    - thelper
+    - tparallel
+    - unconvert
+    - unparam
+    - usestdlibvars
+    # - wastedassign
+    - whitespace
+    - wsl
   fast: false
 
 run:
@@ -28,4 +95,4 @@ run:
 linters-settings:
   gofumpt:
     extra-rules: true
-    lang-version: "1.18"
+    lang-version: "1.20"

Makefile

@@ -19,7 +19,7 @@ GOLANGCI_LINT_PACKAGE ?= github.com/golangci/golangci-lint/cmd/golangci-lint@$(G
 XGO_PACKAGE ?= src.techknowlogick.com/xgo@latest
 
 GENERATE ?=
-XGO_VERSION := go-1.19.x
+XGO_VERSION := go-1.20.x
 XGO_TARGETS ?= linux/amd64,linux/arm64
 
 TARGETOS ?= linux

cmd/drone-docker-buildx/config.go

@@ -7,6 +7,8 @@ import (
 )
 
 // settingsFlags has the cli.Flags for the plugin.Settings.
+//
+//nolint:maintidx
 func settingsFlags(settings *plugin.Settings, category string) []cli.Flag {
 	return []cli.Flag{
 		&cli.BoolFlag{

cmd/drone-docker-buildx/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"os"
 
@@ -13,11 +14,14 @@ import (
 	"github.com/thegeeklab/drone-plugin-lib/v2/urfave"
 )
 
+//nolint:gochecknoglobals
 var (
 	BuildVersion = "devel"
 	BuildDate    = "00000000"
 )
 
+var ErrTypeAssertionFailed = errors.New("type assertion failed")
+
 func main() {
 	settings := &plugin.Settings{}
 
@@ -46,7 +50,12 @@ func run(settings *plugin.Settings) cli.ActionFunc {
 	return func(ctx *cli.Context) error {
 		urfave.LoggingFromContext(ctx)
 
-		settings.Build.CacheFrom = ctx.Generic("cache-from").(*drone.StringSliceFlag).Get()
+		cacheFrom, ok := ctx.Generic("cache-from").(*drone.StringSliceFlag)
+		if !ok {
+			return fmt.Errorf("%w: failed to read cache-from input", ErrTypeAssertionFailed)
+		}
+
+		settings.Build.CacheFrom = cacheFrom.Get()
 
 		plugin := plugin.New(
 			*settings,

go.mod

@@ -1,6 +1,6 @@
 module github.com/thegeeklab/drone-docker-buildx
 
-go 1.19
+go 1.20
 
 require (
 	github.com/coreos/go-semver v0.3.1
@@ -8,11 +8,11 @@ require (
 	github.com/sirupsen/logrus v1.9.0
 	github.com/thegeeklab/drone-plugin-lib/v2 v2.2.1
 	github.com/urfave/cli/v2 v2.24.3
+	golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8
 )
 
 require (
 	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
-	golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect
 )

plugin/daemon.go

@@ -6,8 +6,8 @@ import (
 )
 
 const (
-	dockerExe      = "/usr/local/bin/docker"
-	dockerdExe     = "/usr/local/bin/dockerd"
+	dockerBin      = "/usr/local/bin/docker"
+	dockerdBin     = "/usr/local/bin/dockerd"
 	dockerHome     = "/root/.docker/"
 	buildkitConfig = "/tmp/buildkit.toml"
 )
@@ -21,6 +21,7 @@ func (p Plugin) startDaemon() {
 		cmd.Stdout = io.Discard
 		cmd.Stderr = io.Discard
 	}
+
 	go func() {
 		trace(cmd)
 		_ = cmd.Run()

plugin/docker.go

@@ -3,47 +3,56 @@ package plugin
 import (
 	"fmt"
 	"os"
-	"os/exec"
 	"strings"
 	"time"
 
 	"github.com/urfave/cli/v2"
+	"golang.org/x/sys/execabs"
 )
 
 // helper function to create the docker login command.
-func commandLogin(login Login) *exec.Cmd {
+func commandLogin(login Login) *execabs.Cmd {
 	if login.Email != "" {
 		return commandLoginEmail(login)
 	}
-	return exec.Command(
-		dockerExe, "login",
+
+	args := []string{
+		"login",
 		"-u", login.Username,
 		"-p", login.Password,
 		login.Registry,
+	}
+
+	return execabs.Command(
+		dockerBin, args...,
 	)
 }
 
-func commandLoginEmail(login Login) *exec.Cmd {
-	return exec.Command(
-		dockerExe, "login",
+func commandLoginEmail(login Login) *execabs.Cmd {
+	args := []string{
+		"login",
 		"-u", login.Username,
 		"-p", login.Password,
 		"-e", login.Email,
 		login.Registry,
+	}
+
+	return execabs.Command(
+		dockerBin, args...,
 	)
 }
 
 // helper function to create the docker info command.
-func commandVersion() *exec.Cmd {
-	return exec.Command(dockerExe, "version")
+func commandVersion() *execabs.Cmd {
+	return execabs.Command(dockerBin, "version")
 }
 
 // helper function to create the docker info command.
-func commandInfo() *exec.Cmd {
-	return exec.Command(dockerExe, "info")
+func commandInfo() *execabs.Cmd {
+	return execabs.Command(dockerBin, "info")
 }
 
-func commandBuilder(daemon Daemon) *exec.Cmd {
+func commandBuilder(daemon Daemon) *execabs.Cmd {
 	args := []string{
 		"buildx",
 		"create",
@@ -54,15 +63,15 @@ func commandBuilder(daemon Daemon) *exec.Cmd {
 		args = append(args, "--config", buildkitConfig)
 	}
 
-	return exec.Command(dockerExe, args...)
+	return execabs.Command(dockerBin, args...)
 }
 
-func commandBuildx() *exec.Cmd {
-	return exec.Command(dockerExe, "buildx", "ls")
+func commandBuildx() *execabs.Cmd {
+	return execabs.Command(dockerBin, "buildx", "ls")
 }
 
 // helper function to create the docker build command.
-func commandBuild(build Build, dryrun bool) *exec.Cmd {
+func commandBuild(build Build, dryrun bool) *execabs.Cmd {
 	args := []string{
 		"buildx",
 		"build",
@@ -78,39 +87,51 @@ func commandBuild(build Build, dryrun bool) *exec.Cmd {
 	if !dryrun && build.Output == "" && len(build.Tags.Value()) > 0 {
 		args = append(args, "--push")
 	}
+
 	if build.Compress {
 		args = append(args, "--compress")
 	}
+
 	if build.Pull {
 		args = append(args, "--pull=true")
 	}
+
 	if build.NoCache {
 		args = append(args, "--no-cache")
 	}
+
 	for _, arg := range build.CacheFrom {
 		args = append(args, "--cache-from", arg)
 	}
+
 	if build.CacheTo != "" {
 		args = append(args, "--cache-to", build.CacheTo)
 	}
+
 	for _, arg := range build.ArgsEnv.Value() {
 		addProxyValue(&build, arg)
 	}
+
 	for _, arg := range append(defaultBuildArgs, build.Args.Value()...) {
 		args = append(args, "--build-arg", arg)
 	}
+
 	for _, host := range build.AddHost.Value() {
 		args = append(args, "--add-host", host)
 	}
+
 	if build.Target != "" {
 		args = append(args, "--target", build.Target)
 	}
+
 	if build.Quiet {
 		args = append(args, "--quiet")
 	}
+
 	if build.Output != "" {
 		args = append(args, "--output", build.Output)
 	}
+
 	for _, arg := range build.NamedContext.Value() {
 		args = append(args, "--build-context", arg)
 	}
@@ -135,10 +156,10 @@ func commandBuild(build Build, dryrun bool) *exec.Cmd {
 		args = append(args, "--provenance", build.Provenance)
 	}
 
-	return exec.Command(dockerExe, args...)
+	return execabs.Command(dockerBin, args...)
 }
 
-// helper function to add proxy values from the environment
+// helper function to add proxy values from the environment.
 func addProxyBuildArgs(build *Build) {
 	addProxyValue(build, "http_proxy")
 	addProxyValue(build, "https_proxy")
@@ -182,7 +203,7 @@ func hasProxyBuildArg(build *Build, key string) bool {
 }
 
 // helper function to create the docker daemon command.
-func commandDaemon(daemon Daemon) *exec.Cmd {
+func commandDaemon(daemon Daemon) *execabs.Cmd {
 	args := []string{
 		"--data-root", daemon.StoragePath,
 		"--host=unix:///var/run/docker.sock",
@@ -191,35 +212,44 @@ func commandDaemon(daemon Daemon) *exec.Cmd {
 	if daemon.StorageDriver != "" {
 		args = append(args, "-s", daemon.StorageDriver)
 	}
+
 	if daemon.Insecure && daemon.Registry != "" {
 		args = append(args, "--insecure-registry", daemon.Registry)
 	}
+
 	if daemon.IPv6 {
 		args = append(args, "--ipv6")
 	}
+
 	if len(daemon.Mirror) != 0 {
 		args = append(args, "--registry-mirror", daemon.Mirror)
 	}
+
 	if len(daemon.Bip) != 0 {
 		args = append(args, "--bip", daemon.Bip)
 	}
+
 	for _, dns := range daemon.DNS.Value() {
 		args = append(args, "--dns", dns)
 	}
+
 	for _, dnsSearch := range daemon.DNSSearch.Value() {
 		args = append(args, "--dns-search", dnsSearch)
 	}
+
 	if len(daemon.MTU) != 0 {
 		args = append(args, "--mtu", daemon.MTU)
 	}
+
 	if daemon.Experimental {
 		args = append(args, "--experimental")
 	}
-	return exec.Command(dockerdExe, args...)
+
+	return execabs.Command(dockerdBin, args...)
 }
 
 // trace writes each command to stdout with the command wrapped in an xml
 // tag so that it can be extracted and displayed in the logs.
-func trace(cmd *exec.Cmd) {
+func trace(cmd *execabs.Cmd) {
 	fmt.Fprintf(os.Stdout, "+ %s\n", strings.Join(cmd.Args, " "))
 }

plugin/docker_test.go

@@ -1 +0,0 @@
-package plugin

plugin/impl.go

@@ -3,12 +3,12 @@ package plugin
 import (
 	"fmt"
 	"os"
-	"os/exec"
 	"path/filepath"
 	"time"
 
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli/v2"
+	"golang.org/x/sys/execabs"
 )
 
 // Daemon defines Docker daemon parameters.
@@ -74,6 +74,8 @@ type Settings struct {
 	Dryrun bool
 }
 
+const strictFilePerm = 0o600
+
 // Validate handles the settings validation of the plugin.
 func (p *Plugin) Validate() error {
 	p.settings.Build.Branch = p.pipeline.Repo.Branch
@@ -92,11 +94,14 @@ func (p *Plugin) Validate() error {
 			)
 			if err != nil {
 				logrus.Infof("cannot generate tags from %s, invalid semantic version", p.settings.Build.Ref)
+
 				return err
 			}
+
 			p.settings.Build.Tags = *cli.NewStringSlice(tag...)
 		} else {
 			logrus.Infof("skip auto-tagging for %s, not on default branch or tag", p.settings.Build.Ref)
+
 			return nil
 		}
 	}
@@ -115,55 +120,59 @@ func (p *Plugin) Execute() error {
 	// ready to accept connections before we proceed.
 	for i := 0; i < 15; i++ {
 		cmd := commandInfo()
+
 		err := cmd.Run()
 		if err == nil {
 			break
 		}
+
 		time.Sleep(time.Second * 1)
 	}
 
 	// Create Auth Config File
 	if p.settings.Login.Config != "" {
-		if err := os.MkdirAll(dockerHome, 0o600); err != nil {
-			return fmt.Errorf("failed to create docker home: %s", err)
+		if err := os.MkdirAll(dockerHome, strictFilePerm); err != nil {
+			return fmt.Errorf("failed to create docker home: %w", err)
 		}
 
 		path := filepath.Join(dockerHome, "config.json")
-		err := os.WriteFile(path, []byte(p.settings.Login.Config), 0o600)
+
+		err := os.WriteFile(path, []byte(p.settings.Login.Config), strictFilePerm)
 		if err != nil {
-			return fmt.Errorf("error writing config.json: %s", err)
+			return fmt.Errorf("error writing config.json: %w", err)
 		}
 	}
 
 	// login to the Docker registry
 	if p.settings.Login.Password != "" {
 		cmd := commandLogin(p.settings.Login)
+
 		err := cmd.Run()
 		if err != nil {
-			return fmt.Errorf("error authenticating: %s", err)
+			return fmt.Errorf("error authenticating: %w", err)
 		}
 	}
 
 	if p.settings.Daemon.BuildkitConfig != "" {
-		err := os.WriteFile(buildkitConfig, []byte(p.settings.Daemon.BuildkitConfig), 0o600)
+		err := os.WriteFile(buildkitConfig, []byte(p.settings.Daemon.BuildkitConfig), strictFilePerm)
 		if err != nil {
-			return fmt.Errorf("error writing buildkit.toml: %s", err)
+			return fmt.Errorf("error writing buildkit.toml: %w", err)
 		}
 	}
 
 	switch {
 	case p.settings.Login.Password != "":
-		fmt.Println("Detected registry credentials")
+		logrus.Info("Detected registry credentials")
 	case p.settings.Login.Config != "":
-		fmt.Println("Detected registry credentials file")
+		logrus.Info("Detected registry credentials file")
 	default:
-		fmt.Println("Registry credentials or Docker config not provided. Guest mode enabled.")
+		logrus.Info("Registry credentials or Docker config not provided. Guest mode enabled.")
 	}
 
 	// add proxy build args
 	addProxyBuildArgs(&p.settings.Build)
 
-	var cmds []*exec.Cmd
+	var cmds []*execabs.Cmd
 	cmds = append(cmds, commandVersion()) // docker version
 	cmds = append(cmds, commandInfo())    // docker info
 	cmds = append(cmds, commandBuilder(p.settings.Daemon))

plugin/plugin.go

@@ -12,7 +12,7 @@ type Plugin struct {
 }
 
 // New initializes a plugin from the given Settings, Pipeline, and Network.
-func New(settings Settings, pipeline drone.Pipeline, network drone.Network) drone.Plugin {
+func New(settings Settings, pipeline drone.Pipeline, network drone.Network) *Plugin {
 	return &Plugin{
 		settings: settings,
 		pipeline: pipeline,

plugin/tags.go

@@ -14,9 +14,11 @@ func DefaultTagSuffix(ref, suffix string) ([]string, error) {
 	if err != nil {
 		return nil, err
 	}
+
 	if len(suffix) == 0 {
 		return tags, nil
 	}
+
 	for i, tag := range tags {
 		if tag == "latest" {
 			tags[i] = suffix
@@ -24,13 +26,15 @@ func DefaultTagSuffix(ref, suffix string) ([]string, error) {
 			tags[i] = fmt.Sprintf("%s-%s", tag, suffix)
 		}
 	}
+
 	return tags, nil
 }
 
 func splitOff(input, delim string) string {
-	parts := strings.SplitN(input, delim, 2)
+	const splits = 2
+	parts := strings.SplitN(input, delim, splits)
 
-	if len(parts) == 2 {
+	if len(parts) == splits {
 		return parts[0]
 	}
 
@@ -43,42 +47,65 @@ func DefaultTags(ref string) ([]string, error) {
 	if !strings.HasPrefix(ref, "refs/tags/") {
 		return []string{"latest"}, nil
 	}
-	v := stripTagPrefix(ref)
-	version, err := semver.NewVersion(v)
+
+	rawVersion := stripTagPrefix(ref)
+
+	version, err := semver.NewVersion(rawVersion)
 	if err != nil {
 		return []string{"latest"}, err
 	}
+
 	if version.PreRelease != "" || version.Metadata != "" {
 		return []string{
 			version.String(),
 		}, nil
 	}
 
-	v = stripTagPrefix(ref)
-	v = splitOff(splitOff(v, "+"), "-")
-	dotParts := strings.SplitN(v, ".", 3)
+	rawVersion = stripTagPrefix(ref)
+	rawVersion = splitOff(splitOff(rawVersion, "+"), "-")
+	//nolint:gomnd
+	dotParts := strings.SplitN(rawVersion, ".", 3)
 
 	if version.Major == 0 {
 		return []string{
 			fmt.Sprintf("%0*d.%0*d", len(dotParts[0]), version.Major, len(dotParts[1]), version.Minor),
-			fmt.Sprintf("%0*d.%0*d.%0*d", len(dotParts[0]), version.Major, len(dotParts[1]), version.Minor, len(dotParts[2]), version.Patch),
-		}, nil
-	}
-	return []string{
-		fmt.Sprintf("%0*d", len(dotParts[0]), version.Major),
-		fmt.Sprintf("%0*d.%0*d", len(dotParts[0]), version.Major, len(dotParts[1]), version.Minor),
-		fmt.Sprintf("%0*d.%0*d.%0*d", len(dotParts[0]), version.Major, len(dotParts[1]), version.Minor, len(dotParts[2]), version.Patch),
+			fmt.Sprintf(
+				"%0*d.%0*d.%0*d",
+				len(dotParts[0]),
+				version.Major,
+				len(dotParts[1]),
+				version.Minor,
+				len(dotParts[2]),
+				version.Patch,
+			),
 		}, nil
 	}
 
-// UseDefaultTag for keep only default branch for latest tag
+	return []string{
+		fmt.Sprintf("%0*d", len(dotParts[0]), version.Major),
+		fmt.Sprintf("%0*d.%0*d", len(dotParts[0]), version.Major, len(dotParts[1]), version.Minor),
+		fmt.Sprintf(
+			"%0*d.%0*d.%0*d",
+			len(dotParts[0]),
+			version.Major,
+			len(dotParts[1]),
+			version.Minor,
+			len(dotParts[2]),
+			version.Patch,
+		),
+	}, nil
+}
+
+// UseDefaultTag to keep only default branch for latest tag.
 func UseDefaultTag(ref, defaultBranch string) bool {
 	if strings.HasPrefix(ref, "refs/tags/") {
 		return true
 	}
+
 	if stripHeadPrefix(ref) == defaultBranch {
 		return true
 	}
+
 	return false
 }
 
@@ -89,5 +116,6 @@ func stripHeadPrefix(ref string) string {
 func stripTagPrefix(ref string) string {
 	ref = strings.TrimPrefix(ref, "refs/tags/")
 	ref = strings.TrimPrefix(ref, "v")
+
 	return ref
 }

plugin/tags_test.go

@@ -40,8 +40,10 @@ func TestDefaultTags(t *testing.T) {
 		tags, err := DefaultTags(test.Before)
 		if err != nil {
 			t.Error(err)
+
 			continue
 		}
+
 		got, want := tags, test.After
 		if !reflect.DeepEqual(got, want) {
 			t.Errorf("Got tag %v, want %v", got, want)
@@ -123,8 +125,10 @@ func TestDefaultTagSuffix(t *testing.T) {
 		tag, err := DefaultTagSuffix(test.Before, test.Suffix)
 		if err != nil {
 			t.Error(err)
+
 			continue
 		}
+
 		got, want := tag, test.After
 		if !reflect.DeepEqual(got, want) {
 			t.Errorf("Got tag %v, want %v", got, want)
@@ -136,6 +140,7 @@ func Test_stripHeadPrefix(t *testing.T) {
 	type args struct {
 		ref string
 	}
+
 	tests := []struct {
 		args args
 		want string
@@ -147,6 +152,7 @@ func Test_stripHeadPrefix(t *testing.T) {
 			want: "main",
 		},
 	}
+
 	for _, tt := range tests {
 		if got := stripHeadPrefix(tt.args.ref); got != tt.want {
 			t.Errorf("stripHeadPrefix() = %v, want %v", got, tt.want)
@@ -159,6 +165,7 @@ func TestUseDefaultTag(t *testing.T) {
 		ref           string
 		defaultBranch string
 	}
+
 	tests := []struct {
 		name string
 		args args
@@ -189,6 +196,7 @@ func TestUseDefaultTag(t *testing.T) {
 			want: false,
 		},
 	}
+
 	for _, tt := range tests {
 		if got := UseDefaultTag(tt.args.ref, tt.args.defaultBranch); got != tt.want {
 			t.Errorf("%q. UseDefaultTag() = %v, want %v", tt.name, got, tt.want)