From e68758043b5c49ff9b9f28c14a7000952bf2c246 Mon Sep 17 00:00:00 2001
From: Jose Diaz-Gonzalez <email@josediazgonzalez.com>
Date: Sat, 14 Sep 2024 00:48:22 -0400
Subject: [PATCH] feat: add support for setting an ssh passphrase to use for
 ssh commands

Closes #116
---
 README.md     | 4 ++++
 bin/setup-ssh | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/README.md b/README.md
index 598c649..831d2d7 100644
--- a/README.md
+++ b/README.md
@@ -87,6 +87,10 @@ The following environment variables are supported:
 - `SSH_PRIVATE_KEY`:
   - description: A private SSH key that has push acces to your Dokku instance
   - required: true
+- `SSH_PASSPHRASE`:
+  - description: If set, the passphrase to use when interacting with an SSH key that has a passphrase
+  - required: false
+  - default: ''
 - `TRACE`:
   - description: Allows users to debug what the action is performing by enabling shell trace mode
   - required: false
diff --git a/bin/setup-ssh b/bin/setup-ssh
index f711bbd..675edf7 100755
--- a/bin/setup-ssh
+++ b/bin/setup-ssh
@@ -38,6 +38,14 @@ else
   chmod 600 "/root/.ssh/known_hosts"
 fi
 
+if [ -n "$SSH_PASSPRHASE" ]; then
+  export SSH_ASKPASS="/root/.ssh/askpass.sh"
+  export SSH_ASKPASS_REQUIRE=force
+  # shellcheck disable=SC2016
+  printf '#!/bin/sh\necho "$SSH_PASSPRHASE"\n' >"$SSH_ASKPASS"
+  chmod +x "$SSH_ASKPASS"
+fi
+
 log-info "Adding SSH Key to ssh-agent"
 eval "$(ssh-agent -s)"
 ssh-add /root/.ssh/id_rsa