feat(security/gopass): manage SSH keys from the gopass store

3 files changed, 35 insertions, 5 deletions

diff --git a/modules/security/gopass/default.nix b/modules/security/gopass/default.nix
index 341c901..e543c03 100644
--- a/modules/security/gopass/default.nix
+++ b/modules/security/gopass/default.nix
@@ -10,11 +10,11 @@ let
 
   gopassSshLoadScript = pkgs.writeShellApplication {
     name = "gopass-ssh-load";
-    runtimeInputs = with pkgs; [
+    runtimeInputs = [
       config.security.gopass.package
-      gnupg
-      openssh
-      bash
+      config.security.gpg.package
+      config.security.ssh.package
+      pkgs.bash
     ];
     text =
       builtins.replaceStrings
diff --git a/modules/security/gopass/gopass-ssh-load.sh b/modules/security/gopass/gopass-ssh-load.sh
index e974713..b9a06e9 100644
--- a/modules/security/gopass/gopass-ssh-load.sh
+++ b/modules/security/gopass/gopass-ssh-load.sh
@@ -1,9 +1,30 @@
 #!/usr/bin/env bash
+
+# gopass-ssh-load
+#
+# Load SSH keys into the SSH agent from the gopass password store.
+#
+# This script reads private keys and (optionally) their passphrases from gopass
+# entries under the `ssh/` directory and adds them to the SSH agent served by
+# gpg-agent. It is meant to be run manually whenever a key is imported into or
+# rotated within the gopass store, so the SSH agent picks up the change.
+#
+# Behaviour:
+#   * It first verifies that a usable SSH agent socket exists and bails out if
+#     not.
+#   * It exits early (without doing anything) when the agent already has at
+#     least one Ed25519/RSA/ECDSA identity loaded, to avoid useless work and
+#     unnecessary gpg passphrase prompts.
+#   * For each key listed in GOPASS_SSH_KEYS it writes the corresponding
+#     `ssh/<key>` entry to a temporary file, strips the passphrase using the
+#     `ssh/<key>/passphrase` entry, and registers the key with `ssh-add`.
+#
+# Temporary key files are written with mode 600 and removed afterwards.
+
 set -o errexit
 set -o nounset
 set -o pipefail
 
-# Load SSH keys from gopass password store
 export GNUPGHOME="@@GNUPGHOME@@"
 export GOPASS_SSH_KEYS="@@GOPASS_SSH_KEYS@@"
 
diff --git a/modules/security/gopass/gopass-sync-init.sh b/modules/security/gopass/gopass-sync-init.sh
index 6fe4f8a..c7767f9 100644
--- a/modules/security/gopass/gopass-sync-init.sh
+++ b/modules/security/gopass/gopass-sync-init.sh
@@ -1,5 +1,14 @@
 #!/usr/bin/env bash
 
+# gopass-sync-init
+#
+# Prepare the gopass password store directory for git-backed syncing.
+#
+# This runs during home-manager activation. It ensures the store directory
+# exists, initializes it as a git repository if it is not already one, and adds
+# the configured git remote as `origin` if no remote is set yet. It is a no-op
+# (and thus safe to rerun) when the store is already set up.
+
 STORE_DIR="@@PASSWORD_STORE_DIR@@"
 
 mkdir -p "$STORE_DIR"