Honor CGO_ENABLED environment variable (fix #17)

Author: mholt

builder.go

@@ -83,7 +83,7 @@ func (b Builder) Build(ctx context.Context, outputFile string) error {
 	env = setEnv(env, "GOOS="+b.OS)
 	env = setEnv(env, "GOARCH="+b.Arch)
 	env = setEnv(env, "GOARM="+b.ARM)
-	env = setEnv(env, fmt.Sprintf("CGO_ENABLED=%t", b.Cgo))
+	env = setEnv(env, fmt.Sprintf("CGO_ENABLED=%s", b.Compile.CgoEnabled()))
 
 	log.Println("[INFO] Building Caddy")
 

cmd/xcaddy/main.go

@@ -109,6 +109,9 @@ func runBuild(ctx context.Context, args []string) error {
 
 	// perform the build
 	builder := xcaddy.Builder{
+		Compile: xcaddy.Compile{
+			Cgo: os.Getenv("CGO_ENABLED") == "1",
+		},
 		CaddyVersion: caddyVersion,
 		Plugins:      plugins,
 		Replacements: replacements,

platforms.go

@@ -11,6 +11,15 @@ type Compile struct {
 	Cgo bool `json:"cgo,omitempty"`
 }
 
+// CgoEnabled returns "1" if c.Cgo is true, "0" otherwise.
+// This is used for setting the CGO_ENABLED env variable.
+func (c Compile) CgoEnabled() string {
+	if c.Cgo {
+		return "1"
+	}
+	return "0"
+}
+
 // Platform represents a build target.
 type Platform struct {
 	OS   string `json:"os,omitempty"`