staticcheck (#313)

* CI: use staticcheck for linting

This commit switches the linter for Go code from golint to staticcheck.
Golint has been deprecated since last year and staticcheck is a
recommended replacement.

Signed-off-by: Lucas Servén Marín <lserven@gmail.com>

* revendor

Signed-off-by: Lucas Servén Marín <lserven@gmail.com>

* cmd,pkg: fix lint warnings

Signed-off-by: Lucas Servén Marín <lserven@gmail.com>

vendor/honnef.co/go/tools/lintcmd/version/buildinfo.go

@@ -0,0 +1,44 @@
+package version
+
+import (
+	"fmt"
+	"runtime/debug"
+)
+
+func printBuildInfo() {
+	if info, ok := debug.ReadBuildInfo(); ok {
+		fmt.Println("Main module:")
+		printModule(&info.Main)
+		fmt.Println("Dependencies:")
+		for _, dep := range info.Deps {
+			printModule(dep)
+		}
+	} else {
+		fmt.Println("Built without Go modules")
+	}
+}
+
+func buildInfoVersion() (string, bool) {
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return "", false
+	}
+	if info.Main.Version == "(devel)" {
+		return "", false
+	}
+	return info.Main.Version, true
+}
+
+func printModule(m *debug.Module) {
+	fmt.Printf("\t%s", m.Path)
+	if m.Version != "(devel)" {
+		fmt.Printf("@%s", m.Version)
+	}
+	if m.Sum != "" {
+		fmt.Printf(" (sum: %s)", m.Sum)
+	}
+	if m.Replace != nil {
+		fmt.Printf(" (replace: %s)", m.Replace.Path)
+	}
+	fmt.Println()
+}

vendor/honnef.co/go/tools/lintcmd/version/version.go

@@ -0,0 +1,43 @@
+package version
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+)
+
+const Version = "2022.1.1"
+const MachineVersion = "v0.3.1"
+
+// version returns a version descriptor and reports whether the
+// version is a known release.
+func version(human, machine string) (human_, machine_ string, known bool) {
+	if human != "devel" {
+		return human, machine, true
+	}
+	v, ok := buildInfoVersion()
+	if ok {
+		return v, "", false
+	}
+	return "devel", "", false
+}
+
+func Print(human, machine string) {
+	human, machine, release := version(human, machine)
+
+	if release {
+		fmt.Printf("%s %s (%s)\n", filepath.Base(os.Args[0]), human, machine)
+	} else if human == "devel" {
+		fmt.Printf("%s (no version)\n", filepath.Base(os.Args[0]))
+	} else {
+		fmt.Printf("%s (devel, %s)\n", filepath.Base(os.Args[0]), human)
+	}
+}
+
+func Verbose(human, machine string) {
+	Print(human, machine)
+	fmt.Println()
+	fmt.Println("Compiled with Go version:", runtime.Version())
+	printBuildInfo()
+}