From 4efd9c440b9b2cc5e74e4e1721c01afc908b8bdc Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Sun, 22 Jan 2023 08:32:20 +0000
Subject: [PATCH] postfix: add trivial updater

---
 pkgs/servers/mail/postfix/default.nix |  6 +++++-
 pkgs/servers/mail/postfix/update.sh   | 10 ++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100755 pkgs/servers/mail/postfix/update.sh

diff --git a/pkgs/servers/mail/postfix/default.nix b/pkgs/servers/mail/postfix/default.nix
index 1093e8a8d1ce..684e8ade5226 100644
--- a/pkgs/servers/mail/postfix/default.nix
+++ b/pkgs/servers/mail/postfix/default.nix
@@ -104,7 +104,11 @@ in stdenv.mkDerivation rec {
       --prefix PATH ":" ${lib.makeBinPath [ coreutils findutils gnugrep gawk gnused ]}
   '';
 
-  passthru.tests = { inherit (nixosTests) postfix postfix-raise-smtpd-tls-security-level; };
+  passthru = {
+    tests = { inherit (nixosTests) postfix postfix-raise-smtpd-tls-security-level; };
+
+    updateScript = ./update.sh;
+  };
 
   meta = with lib; {
     homepage = "http://www.postfix.org/";
diff --git a/pkgs/servers/mail/postfix/update.sh b/pkgs/servers/mail/postfix/update.sh
new file mode 100755
index 000000000000..eacb548bc002
--- /dev/null
+++ b/pkgs/servers/mail/postfix/update.sh
@@ -0,0 +1,10 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p curl pcre common-updater-scripts
+
+set -eu -o pipefail
+
+# Expect the text in format of '<a href="official/postfix-3.7.4.tar.gz">Source code</a> |'
+# Stable release goes first.
+new_version="$(curl -s http://cdn.postfix.johnriley.me/mirrors/postfix-release/index.html |
+    pcregrep -o1 '"official/postfix-([0-9.]+)[.]tar[.]gz">' | head -n1)"
+update-source-version postfix "$new_version"