Support building with Go 1.17 (#66)

* Support building with Go 1.17
Fixes #65

Signed-off-by: Juraci Paixão Kröhling <juraci@kroehling.de>

* Update workflows to use Go 1.17

Signed-off-by: Juraci Paixão Kröhling <juraci@kroehling.de>

* Add gosec exceptions for exec.Command

Signed-off-by: Juraci Paixão Kröhling <juraci@kroehling.de>

.github/workflows/go.yaml

@@ -15,7 +15,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v2
       with:
-        go-version: 1.16
+        go-version: 1.17
 
     - name: Check out code into the Go module directory
       uses: actions/checkout@v2

.github/workflows/integration-test.yaml

@@ -15,7 +15,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v2
       with:
-        go-version: 1.16
+        go-version: 1.17
 
     - name: Check out code into the Go module directory
       uses: actions/checkout@v2

.github/workflows/release.yml

@@ -18,7 +18,7 @@ jobs:
         name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.16
+          go-version: 1.17
       -
         name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v2

cmd/root.go

@@ -75,7 +75,7 @@ func Execute() error {
 	cmd.Flags().BoolVar(&cfg.Distribution.IncludeCore, "include-core", true, "Whether the core components should be included in the distribution")
 	cmd.Flags().StringVar(&cfg.Distribution.OtelColVersion, "otelcol-version", cfg.Distribution.OtelColVersion, "Which version of OpenTelemetry Collector to use as base")
 	cmd.Flags().StringVar(&cfg.Distribution.OutputPath, "output-path", cfg.Distribution.OutputPath, "Where to write the resulting files")
-	cmd.Flags().StringVar(&cfg.Distribution.Go, "go", "/usr/bin/go", "The Go binary to use during the compilation phase")
+	cmd.Flags().StringVar(&cfg.Distribution.Go, "go", "", "The Go binary to use during the compilation phase. Default: go from the PATH")
 	cmd.Flags().StringVar(&cfg.Distribution.Module, "module", "github.com/open-telemetry/opentelemetry-collector-builder", "The Go module for the new distribution")
 
 	// version of this binary

go.mod

@@ -14,7 +14,7 @@
 
 module github.com/open-telemetry/opentelemetry-collector-builder
 
-go 1.16
+go 1.17
 
 require (
 	github.com/go-logr/logr v0.2.1
@@ -24,3 +24,26 @@ require (
 	github.com/stretchr/testify v1.6.1
 	go.uber.org/zap v1.10.0
 )
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/fsnotify/fsnotify v1.4.7 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/magiconair/properties v1.8.1 // indirect
+	github.com/mitchellh/mapstructure v1.1.2 // indirect
+	github.com/pelletier/go-toml v1.2.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/spf13/afero v1.1.2 // indirect
+	github.com/spf13/cast v1.3.0 // indirect
+	github.com/spf13/jwalterweatherman v1.0.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/subosito/gotenv v1.2.0 // indirect
+	go.uber.org/atomic v1.4.0 // indirect
+	go.uber.org/multierr v1.1.0 // indirect
+	golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0 // indirect
+	golang.org/x/text v0.3.2 // indirect
+	gopkg.in/ini.v1 v1.51.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+)

internal/builder/config.go

@@ -19,6 +19,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
+	"os/exec"
 	"strings"
 
 	"github.com/go-logr/logr"
@@ -89,7 +90,17 @@ func DefaultConfig() Config {
 }
 
 // Validate checks whether the current configuration is valid
-func (c Config) Validate() error {
+func (c *Config) Validate() error {
+	// #nosec G204
+	if _, err := exec.Command(c.Distribution.Go, "env").CombinedOutput(); err != nil {
+		path, err := exec.LookPath("go")
+		if err != nil {
+			return ErrGoNotFound
+		}
+		c.Distribution.Go = path
+	}
+	c.Logger.Info("Using go", "Go executable", c.Distribution.Go)
+
 	return nil
 }
 

internal/builder/main.go

@@ -95,14 +95,9 @@ func Compile(cfg Config) error {
 		return nil
 	}
 
-	// first, we test to check if we have Go at all
-	goBinary, err := getGoPath(cfg)
-	if err != nil {
-		return err
-	}
-
 	cfg.Logger.Info("Compiling")
-	cmd := exec.Command(goBinary, "build", "-ldflags=-s -w", "-trimpath", "-o", cfg.Distribution.ExeName)
+	// #nosec G204
+	cmd := exec.Command(cfg.Distribution.Go, "build", "-ldflags=-s -w", "-trimpath", "-o", cfg.Distribution.ExeName)
 	cmd.Dir = cfg.Distribution.OutputPath
 	if out, err := cmd.CombinedOutput(); err != nil {
 		return fmt.Errorf("failed to compile the OpenTelemetry Collector distribution: %w. Output: %q", err, out)
@@ -114,20 +109,21 @@ func Compile(cfg Config) error {
 
 // GetModules retrieves the go modules, updating go.mod and go.sum in the process
 func GetModules(cfg Config) error {
-	// first, we test to check if we have Go at all
-	goBinary, err := getGoPath(cfg)
-	if err != nil {
-		return err
+	// #nosec G204
+	cmd := exec.Command(cfg.Distribution.Go, "mod", "tidy")
+	cmd.Dir = cfg.Distribution.OutputPath
+	if out, err := cmd.CombinedOutput(); err != nil {
+		return fmt.Errorf("failed to update go.mod: %w. Output: %q", err, out)
 	}
 
 	cfg.Logger.Info("Getting go modules")
-
 	// basic retry if error from go mod command (in case of transient network error). This could be improved
 	// retry 3 times with 5 second spacing interval
 	retries := 3
 	failReason := "unknown"
 	for i := 1; i <= retries; i++ {
-		cmd := exec.Command(goBinary, "mod", "download", "all")
+		// #nosec G204
+		cmd := exec.Command(cfg.Distribution.Go, "mod", "download", "all")
 		cmd.Dir = cfg.Distribution.OutputPath
 		if out, err := cmd.CombinedOutput(); err != nil {
 			failReason = fmt.Sprintf("%s. Output: %q", err, out)
@@ -140,21 +136,6 @@ func GetModules(cfg Config) error {
 	return fmt.Errorf("failed to download go modules: %s", failReason)
 }
 
-// getGoPath checks if go is present and correct, and returns a useable go bin location
-func getGoPath(cfg Config) (string, error) {
-	goBinary := cfg.Distribution.Go
-	if _, err := exec.Command(goBinary, "env").CombinedOutput(); err != nil {
-		path, err := exec.LookPath("go")
-		if err != nil {
-			return "", ErrGoNotFound
-		}
-		goBinary = path
-		cfg.Logger.Info("Using go from PATH", "Go executable", path)
-	}
-
-	return goBinary, nil
-}
-
 func processAndWrite(cfg Config, tmpl string, outFile string, tmplParams interface{}) error {
 	t, err := template.New("template").Parse(tmpl)
 	if err != nil {

internal/scaffold/gomod.go

@@ -17,7 +17,7 @@ package scaffold
 const Gomod = `
 module {{.Distribution.Module}}
 
-go 1.16
+go 1.17
 
 require (
 	{{- range .Extensions}}