From 670630de57469d90826cc3d46924530e8578b0b3 Mon Sep 17 00:00:00 2001
From: Dominik Schulz <dominik.schulz@gauner.org>
Date: Mon, 18 Jan 2021 23:02:53 +0100
Subject: [PATCH] Add Pinentry CLI fallback (#1697)

Fixes #1655

RELEASE_NOTES=[ENHANCEMENT] Add Pinentry CLI fallback

Signed-off-by: Dominik Schulz <dominik.schulz@gauner.org>
---
 internal/backend/crypto/age/askpass.go |  8 ++++-
 pkg/pinentry/cli/fallback.go           | 42 ++++++++++++++++++++++++++
 2 files changed, 49 insertions(+), 1 deletion(-)
 create mode 100644 pkg/pinentry/cli/fallback.go

diff --git a/internal/backend/crypto/age/askpass.go b/internal/backend/crypto/age/askpass.go
index a6d5df023d..95eea9d6c9 100644
--- a/internal/backend/crypto/age/askpass.go
+++ b/internal/backend/crypto/age/askpass.go
@@ -8,6 +8,7 @@ import (
 	"github.com/gopasspw/gopass/internal/cache"
 	"github.com/gopasspw/gopass/pkg/debug"
 	"github.com/gopasspw/gopass/pkg/pinentry"
+	"github.com/gopasspw/gopass/pkg/pinentry/cli"
 )
 
 type piner interface {
@@ -38,7 +39,12 @@ func newAskPass() *askPass {
 	return &askPass{
 		cache: cache.NewInMemTTL(time.Hour, 24*time.Hour),
 		pinentry: func() (piner, error) {
-			return pinentry.New()
+			p, err := pinentry.New()
+			if err == nil {
+				return p, nil
+			}
+			debug.Log("Pinentry not found: %q", err)
+			return cli.New()
 		},
 	}
 }
diff --git a/pkg/pinentry/cli/fallback.go b/pkg/pinentry/cli/fallback.go
new file mode 100644
index 0000000000..bc229b24c9
--- /dev/null
+++ b/pkg/pinentry/cli/fallback.go
@@ -0,0 +1,42 @@
+package cli
+
+import (
+	"context"
+
+	"github.com/gopasspw/gopass/pkg/termio"
+)
+
+// Client is pinentry CLI drop-in
+type Client struct{}
+
+// New creates a new client
+func New() (*Client, error) {
+	return &Client{}, nil
+}
+
+// Close is a no-op
+func (c *Client) Close() {}
+
+// Confirm is a no-op
+func (c *Client) Confirm() bool {
+	return true
+}
+
+// Set is a no-op
+func (c *Client) Set(string, string) error {
+	return nil
+}
+
+// Option is a no-op
+func (c *Client) Option(string) error {
+	return nil
+}
+
+// GetPin prompts for the pin in the termnial and returns the output
+func (c *Client) GetPin() ([]byte, error) {
+	pw, err := termio.AskForPassword(context.TODO(), "Please enter your PIN")
+	if err != nil {
+		return nil, err
+	}
+	return []byte(pw), nil
+}