3 files changed, 111 insertions, 0 deletions
diff --git a/assemble.go b/assemble.go
new file mode 100644
index 0000000..246ba6e
--- /dev/null
+++ b/assemble.go
@@ -0,0 +1,7 @@
+package main
+
+import "fmt"
+
+func assemble(opts options) error {
+	return fmt.Errorf("TODO")
+}
diff --git a/go.mod b/go.mod
index 9622183..400b49a 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,5 @@
 module git.cs.kau.se/rasmoste/ct-sans
 
 go 1.19
+
+require gitlab.torproject.org/rgdd/ct v0.0.0-20230115071200-fa4d0bcd1cab // indirect
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..3e71076
--- /dev/null
+++ b/main.go
@@ -0,0 +1,102 @@
+// Package main provides a utility named ct-sans.
+//
+// Install:
+//
+//	go install gitlab.torproject.org/rgdd/ct/cmd/ct-sans@latest
+//
+// Usage:
+//
+//	$ ct-sans -h
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"git.cs.kau.se/rasmoste/ct-sans/internal/ctflag"
+)
+
+const usage = `ct-sans collects SANs in CT-logged certificates
+
+Usage:
+
+  ct-sans snapshot [-d DIRECTORY]
+    Refresh log lists, signed tree heads, and timestamps
+
+  ct-sans collect [-d DIRECTORY]
+    Collect SANs with regards to the current snapshot
+
+  ct-sans assemble [-d DIRECTORY]
+    Assemble a dataset manifest and print a command that combines,
+    sorts, and removes duplicate SANs that were collected.
+
+Help:
+
+  ct-sans [-h] [--help]
+
+Options:
+
+  -d, --directory:  The ct-sans working directory (Default: "ct-sans")
+
+`
+
+type options struct {
+	Directory string
+
+	logDirectory          string
+	metadataFile          string
+	metadataSignatureFile string
+	metadataTimestampFile string
+	sthFile               string
+	stateFile             string
+	sansFile              string
+}
+
+func main() {
+	if ctflag.WantHelp(os.Args, 1) {
+		fmt.Fprintf(os.Stderr, usage)
+		os.Exit(1)
+	}
+
+	// Define command-line options
+	fs := ctflag.NewFlagSet()
+	opts := options{}
+	ctflag.String(&fs, &opts.Directory, "directory", "d", "ct-sans")
+
+	// Parse command-line options and hardcode default values
+	if err := ctflag.Parse(fs, os.Args[2:]); err != nil {
+		if err == flag.ErrHelp {
+			fmt.Fprintf(os.Stderr, usage)
+			os.Exit(1)
+		}
+
+		fmt.Fprintf(os.Stderr, "error: %v\n\n", err)
+		os.Exit(2)
+	}
+	opts.logDirectory = opts.Directory + "/" + "logs"
+	opts.metadataFile = "metadata.json"
+	opts.metadataSignatureFile = "metadata.sig"
+	opts.metadataTimestampFile = "metadata.sig"
+	opts.sthFile = "sth.json"
+	opts.stateFile = "th.json"
+	opts.sansFile = "sans.lst"
+
+	// Hand-over to the respective subcommands
+	var err error
+	switch cmd := os.Args[1]; cmd {
+	//case "snapshot":
+	//	err = snapshot(opts)
+	//case "collect":
+	//	err = collect(opts)
+	case "assemble":
+		err = assemble(opts)
+	default:
+		fmt.Fprintf(os.Stderr, "ct-sans: unknown command %q\n\n", cmd)
+		os.Exit(3)
+	}
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "ct-sans %s: error: %v\n", os.Args[1], err)
+		os.Exit(4)
+	}
+}