1 files changed, 92 insertions, 0 deletions
diff --git a/cmd/sigsum-debug/main.go b/cmd/sigsum-debug/main.go
new file mode 100644
index 0000000..1d9e769
--- /dev/null
+++ b/cmd/sigsum-debug/main.go
@@ -0,0 +1,92 @@
+// package main provides a tool named sigsum-debug.
+//
+// Install as follows:
+//
+//     $ go install -ldflags="-X 'main.someVersion=git commit $(git rev-list -1 HEAD)'"
+//
+// Usage:
+//
+//     $ sigsum-debug help
+//
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+)
+
+const usage = `sigsum-debug version %s
+
+Usage:
+    sigsum-debug help
+        Outputs a usage message.
+
+    sigsum-debug genkey
+        Outputs a new private key.
+
+    sigsum-debug pubkey
+        Reads a private key from stdin and output its public key.
+
+    sigsum-debug hashkey
+        Reads a public key from stdin and output its key hash.
+`
+
+var (
+	someVersion = "unknown"
+)
+
+func main() {
+	log.SetFlags(0)
+
+	var err error
+	switch cmd := parseCommand(); cmd.Name() {
+	case "help":
+		cmd.Usage()
+	case "genkey":
+		err = CmdGenKey()
+	case "pubkey":
+		err = CmdPubKey()
+	case "hashkey":
+		err = CmdHashKey()
+	default:
+		err = fmt.Errorf("invalid command %q, try %q", cmd.Name(), "sigsum help")
+	}
+
+	if err != nil {
+		log.Printf("%s", err)
+		os.Exit(1)
+	}
+}
+
+func parseCommand() *flag.FlagSet {
+	args := os.Args
+	if len(args) < 2 {
+		args = append(args, "")
+	}
+
+	fs := flag.NewFlagSet(args[1], flag.ExitOnError)
+	fs.Usage = func() {
+		log.Printf(usage, someVersion)
+	}
+	registerOptions(fs)
+	fs.Parse(args[2:])
+	return fs
+}
+
+func registerOptions(fs *flag.FlagSet) {
+	switch cmd := fs.Name(); cmd {
+	default:
+	}
+}
+
+func registerStringOption(fs *flag.FlagSet, opt *string, short, long, value string) {
+	fs.StringVar(opt, short, value, "")
+	fs.StringVar(opt, long, value, "")
+}
+
+func registerUint64Option(fs *flag.FlagSet, opt *uint64, short, long string, value uint64) {
+	fs.Uint64Var(opt, short, value, "")
+	fs.Uint64Var(opt, long, value, "")
+}