cmd: continue lint fixes.

cmd/pembody/main.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"encoding/pem"
+	"flag"
+	"io"
+	"os"
+
+	"git.wntrmute.dev/kyle/goutils/lib"
+)
+
+func main() {
+	flag.Parse()
+	if flag.NArg() != 1 {
+		lib.Errx(lib.ExitFailure, "a single filename is required")
+	}
+
+	var in []byte
+	var err error
+
+	path := flag.Arg(0)
+	if path == "-" {
+		in, err = io.ReadAll(os.Stdin)
+	} else {
+		in, err = os.ReadFile(flag.Arg(0))
+	}
+	if err != nil {
+		lib.Err(lib.ExitFailure, err, "couldn't read file")
+	}
+
+	p, _ := pem.Decode(in)
+	if p == nil {
+		lib.Errx(lib.ExitFailure, "%s isn't a PEM-encoded file", flag.Arg(0))
+	}
+	if _, err := os.Stdout.Write(p.Bytes); err != nil {
+		lib.Err(lib.ExitFailure, err, "writing body")
+	}
+}