Fix import cycle (over SSH keyfile passphrase input)

src/sync/input.go

@@ -0,0 +1,16 @@
+package sync
+
+import (
+	"fmt"
+	"golang.org/x/crypto/ssh/terminal"
+	"os"
+)
+
+// inputKeyFilePassphrase prompts the user for a passphrase for an SSH key file
+// TODO support non-CLI implementations
+func inputKeyFilePassphrase() []byte {
+	fmt.Print("\nEnter passphrase for your SSH keyfile: ")
+	passphrase, _ := terminal.ReadPassword(int(os.Stdin.Fd()))
+	fmt.Println()
+	return passphrase
+}