Include agenix module and package directly

Avoids adding an extra flake input only to fetch a single module and
package.

m/common/base/agenix.nix

@@ -1,3 +1,8 @@
+{ pkgs, ... }:
+
 {
   imports = [ ../../module/agenix.nix ];
+
+  # Add agenix to system packages
+  environment.systemPackages = [ pkgs.agenix ];
 }

m/module/agenix.nix

@@ -297,9 +297,6 @@ in
         };
       };
 
-      # Add agenix to system packages
-      environment.systemPackages = [ pkgs.agenix ];
-
       # Create a new directory full of secrets for symlinking (this helps
       # ensure removed secrets are actually removed, or at least become
       # invalid symlinks).

pkgs/agenix/default.nix

@@ -27,7 +27,6 @@ stdenv.mkDerivation rec {
   doInstallCheck = true;
   installCheckInputs = [ shellcheck ];
   postInstallCheck = ''
-    set -x
     shellcheck ${bin}
     ${bin} -h | grep ${version}
 
@@ -57,7 +56,6 @@ stdenv.mkDerivation rec {
 
     cd $HOME/secrets
     test $(${bin} -d secret1.age) = "hello"
-    set +x
   '';
 
   installPhase = ''

pkgs/agenix/update.sh

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+set -e
+
+# All operations are done relative to root
+GITROOT=$(git rev-parse --show-toplevel)
+cd "$GITROOT"
+
+REVISION=${1:-main}
+
+TMPCLONE=$(mktemp -d)
+trap "rm -rf ${TMPCLONE}" EXIT
+
+git clone https://github.com/ryantm/agenix.git --revision="$REVISION" "$TMPCLONE" --depth=1
+
+cp "${TMPCLONE}/pkgs/agenix.sh" pkgs/agenix/agenix.sh
+cp "${TMPCLONE}/pkgs/agenix.nix" pkgs/agenix/default.nix
+sed -i 's#../example#./example#' pkgs/agenix/default.nix
+
+cp "${TMPCLONE}/example/"* pkgs/agenix/example/
+cp "${TMPCLONE}/example_keys/"* pkgs/agenix/example_keys/
+
+cp "${TMPCLONE}/modules/age.nix" m/module/agenix.nix