trezor: show support in version string

Show enable_trezor in the version string if we were compiled
with `-tags enable_trezor`. And hide the `-trezor` flag from
the help output if we were not.

1 files changed, 3 insertions, 1 deletions

diff --git a/internal/readpassword/trezor_disabled.go b/internal/readpassword/trezor_disabled.go
index c512f1b..96a6082 100644
--- a/internal/readpassword/trezor_disabled.go
+++ b/internal/readpassword/trezor_disabled.go
@@ -12,12 +12,14 @@ const (
 	// TrezorPayloadLen is the length of the payload data passed to Trezor's
 	// CipherKeyValue function.
 	TrezorPayloadLen = 32
+	// TrezorSupport is true when gocryptfs has been compile with -tags enable_trezor
+	TrezorSupport = false
 )
 
 // Trezor determinitically derives 32 bytes from the payload and the connected
 // USB security module.
 func Trezor(payload []byte) []byte {
-	tlog.Fatal.Printf("\"-trezor\" is not implemented yet.")
+	tlog.Fatal.Printf("This binary has been compiled without Trezor support")
 	os.Exit(1)
 	return nil
 }