Use cobra to turn linkctl into a proper cli

Most commands are currently placeholders but version and db init work

cmd/linkctl/db.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"fmt"
+
+	"git.omicron.one/omicron/linkshare/internal/database"
+	"git.omicron.one/omicron/linkshare/internal/util"
+	"git.omicron.one/omicron/linkshare/internal/version"
+	"github.com/spf13/cobra"
+)
+
+func openDB() (*database.DB, error) {
+	paths, err := util.FindDirectories(dbPath)
+	if err != nil {
+		return nil, err
+	}
+	return database.Open(paths.DatabaseFile)
+}
+
+func dbPreRun(cmd *cobra.Command, args []string) error {
+	return setupDb()
+}
+
+func dbPostRun(cmd *cobra.Command, args []string) error {
+	return cleanupDb()
+}
+
+func dbInitHandler(cmd *cobra.Command, args []string) {
+	err := db.Initialize(paths.SchemaDir)
+	if err == database.ErrAlreadyInitialized {
+		fmt.Printf("Database %q is already initialized\n", dbPath)
+		return
+	}
+	if err == nil {
+		fmt.Printf("Initialized database %q with schema version %d\n", dbPath, version.SchemaVersion)
+		return
+	}
+
+	fmt.Printf("Failed to initialize database %q: %v\n", dbPath, err)
+}
+
+func dbBackupHandler(cmd *cobra.Command, args []string) {
+	fmt.Println("Not implemented")
+}
+
+func dbUpdateHandler(cmd *cobra.Command, args []string) {
+	fmt.Println("Not implemented")
+}