list keys and refactor

agent.go

@@ -4,7 +4,10 @@ import (
 	"fmt"
 	"net"
 	"os"
+	"os/exec"
+	"os/signal"
 	"path/filepath"
+	"strings"
 	"syscall"
 
 	"golang.org/x/crypto/ssh"
@@ -13,7 +16,7 @@ import (
 )
 
 func startEphemeralAgent(pemData []byte, target string) (string, func(), error) {
-	var key interface{}
+	var key any
 	var err error
 
 	key, err = ssh.ParseRawPrivateKey(pemData)
@@ -75,3 +78,75 @@ func startEphemeralAgent(pemData []byte, target string) (string, func(), error)
 	}
 	return sockPath, cleanup, nil
 }
+
+func startSSH(dbPath string, args []string) {
+	user, host := parseDestination(args)
+	env := os.Environ()
+
+	if host != "" {
+		db, err := initDB(dbPath)
+		if err != nil {
+			fmt.Println("Error:", err)
+			os.Exit(1)
+		}
+
+		pemData, err := findKey(db, user, host)
+		if err != nil {
+			fmt.Println("Error:", err)
+			os.Exit(1)
+		}
+
+		db.Close()
+
+		targetName := host
+		if user != "" {
+			targetName = user + "@" + host
+		}
+
+		socketPath, cleanup, err := startEphemeralAgent(pemData, targetName)
+		if err != nil {
+			fmt.Println("Error:", err)
+			os.Exit(1)
+		}
+		defer cleanup()
+
+		newEnv := []string{"SSH_AUTH_SOCK=" + socketPath}
+		for _, e := range env {
+			if !strings.HasPrefix(e, "SSH_AUTH_SOCK=") {
+				newEnv = append(newEnv, e)
+			}
+		}
+		env = newEnv
+	}
+
+	sshPath, err := exec.LookPath("ssh")
+	if err != nil {
+		fmt.Println("Error:", err)
+		os.Exit(1)
+	}
+
+	sshCmd := exec.Command(sshPath, args...)
+	sshCmd.Env = env
+	sshCmd.Stdin = os.Stdin
+	sshCmd.Stdout = os.Stdout
+	sshCmd.Stderr = os.Stderr
+
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, os.Interrupt, syscall.SIGTERM)
+	go func() {
+		for sig := range c {
+			if sshCmd.Process != nil {
+				sshCmd.Process.Signal(sig)
+			}
+		}
+	}()
+
+	err = sshCmd.Run()
+	if err != nil {
+		fmt.Println("Error:", err)
+		if exitErr, ok := err.(*exec.ExitError); ok {
+			os.Exit(exitErr.ExitCode())
+		}
+		os.Exit(1)
+	}
+}

cmd.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"text/tabwriter"
+)
+
+func handleAddKey(dbPath, userPattern, hostPattern, keyPath string) error {
+	db, err := initDB(dbPath)
+	if err != nil {
+		return err
+	}
+	defer db.Close()
+
+	err = addKey(db, userPattern, hostPattern, keyPath)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func handleListKey(dbPath string) error {
+	db, err := initDB(dbPath)
+	if err != nil {
+		return err
+	}
+	defer db.Close()
+
+	keys, err := listkeys(db)
+	if err != nil {
+		return err
+	}
+
+	w := tabwriter.NewWriter(os.Stdout, 0, 0, 3, ' ', 0)
+	fmt.Fprintln(w, "UD\tUser Pattern\tHost Pattern\tComment")
+	fmt.Fprintln(w, "--\t------------\t------------\t-------")
+	for _, k := range keys {
+		fmt.Fprintf(w, "%d\t%s\t%s\t%s\n", k.ID, k.UserPattern, k.HostPattern, k.Comment)
+	}
+	w.Flush()
+	return nil
+}

db.go

@@ -9,6 +9,13 @@ import (
 	_ "modernc.org/sqlite"
 )
 
+type KeyRecord struct {
+	ID          int
+	HostPattern string
+	UserPattern string
+	Comment     string
+}
+
 func getDBPath() string {
 	home, _ := os.UserHomeDir()
 	localDataDir := filepath.Join(home, ".local", "share", "gosh")
@@ -67,3 +74,22 @@ func addKey(db *sql.DB, userPattern, hostPattern, keyPath string) error {
 
 	return nil
 }
+
+func listkeys(db *sql.DB) ([]KeyRecord, error) {
+	rows, err := db.Query("SELECT id, host_pattern, user_pattern, comment FROM keys;")
+	if err != nil {
+		return nil, fmt.Errorf("failed to query keys: %w", err)
+	}
+	defer rows.Close()
+
+	var keys []KeyRecord
+	for rows.Next() {
+		var k KeyRecord
+		if err := rows.Scan(&k.ID, &k.HostPattern, &k.UserPattern, &k.Comment); err != nil {
+			return nil, fmt.Errorf("failed to scan row: %w", err)
+		}
+		keys = append(keys, k)
+	}
+
+	return keys, nil
+}

main.go

@@ -4,16 +4,13 @@ import (
 	"flag"
 	"fmt"
 	"os"
-	"os/exec"
-	"os/signal"
-	"strings"
-	"syscall"
 )
 
 func main() {
 	flag.Usage = func() {
 		fmt.Fprintf(os.Stderr, "Usage: %s [gosh-flags] [user@host] [ssh-flags]\n", os.Args[0])
 		fmt.Fprintf(os.Stderr, "\nManagement Commands:\n")
+		fmt.Fprintf(os.Stderr, "  %s [flags] list-keys\n", os.Args[0])
 		fmt.Fprintf(os.Stderr, "  %s [flags] add-key <user_pattern> <host_pattern> <path_to_key>\n", os.Args[0])
 		fmt.Fprintf(os.Stderr, "\nFlags:\n")
 		flag.PrintDefaults()
@@ -32,98 +29,29 @@ func main() {
 
 	cmd := args[0]
 
-	if cmd == "add-key" {
+	switch cmd {
+	case "add-key":
 		if argc != 4 {
 			fmt.Println("Error: Incorrect arguments for add-key.")
 			fmt.Println("Try: gosh [--db path] add-key <user_pattern> <host_pattern> <path_to_key>")
 			os.Exit(1)
 		}
 
-		db, err := initDB(*dbPath)
+		err := handleAddKey(*dbPath, args[1], args[2], args[3])
 		if err != nil {
 			fmt.Println("Error:", err)
 			os.Exit(1)
 		}
-		defer db.Close()
+		os.Exit(0)
 
-		userPattern := args[1]
-		hostPattern := args[2]
-		keyPath := args[3]
-		err = addKey(db, userPattern, hostPattern, keyPath)
+	case "list-keys":
+		err := handleListKey(*dbPath)
 		if err != nil {
 			fmt.Println("Error:", err)
 			os.Exit(1)
 		}
-		return
+		os.Exit(0)
 	}
 
-	user, host := parseDestination(args)
-	env := os.Environ()
-
-	if host != "" {
-		db, err := initDB(*dbPath)
-		if err != nil {
-			fmt.Println("Error:", err)
-			os.Exit(1)
-		}
-
-		pemData, err := findKey(db, user, host)
-		if err != nil {
-			fmt.Println("Error:", err)
-			os.Exit(1)
-		}
-
-		db.Close()
-
-		targetName := host
-		if user != "" {
-			targetName = user + "@" + host
-		}
-
-		socketPath, cleanup, err := startEphemeralAgent(pemData, targetName)
-		if err != nil {
-			fmt.Println("Error:", err)
-			os.Exit(1)
-		}
-		defer cleanup()
-
-		newEnv := []string{"SSH_AUTH_SOCK=" + socketPath}
-		for _, e := range env {
-			if !strings.HasPrefix(e, "SSH_AUTH_SOCK=") {
-				newEnv = append(newEnv, e)
-			}
-		}
-		env = newEnv
-	}
-
-	sshPath, err := exec.LookPath("ssh")
-	if err != nil {
-		fmt.Println("Error:", err)
-		os.Exit(1)
-	}
-
-	sshCmd := exec.Command(sshPath, args...)
-	sshCmd.Env = env
-	sshCmd.Stdin = os.Stdin
-	sshCmd.Stdout = os.Stdout
-	sshCmd.Stderr = os.Stderr
-
-	c := make(chan os.Signal, 1)
-	signal.Notify(c, os.Interrupt, syscall.SIGTERM)
-	go func() {
-		for sig := range c {
-			if sshCmd.Process != nil {
-				sshCmd.Process.Signal(sig)
-			}
-		}
-	}()
-
-	err = sshCmd.Run()
-	if err != nil {
-		fmt.Println("Error:", err)
-		if exitErr, ok := err.(*exec.ExitError); ok {
-			os.Exit(exitErr.ExitCode())
-		}
-		os.Exit(1)
-	}
+	startSSH(*dbPath, args)
 }