From a05fb1ecd95f2f16a8545cab9d4aca7bd37ab4b8 Mon Sep 17 00:00:00 2001
From: Peter Cai <peter@typeblog.net>
Date: Sat, 27 Apr 2024 15:06:07 -0400
Subject: [PATCH] Add AUR as version check / cache invalidation source

---
 build-image.sh | 3 +++
 functions.sh   | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/build-image.sh b/build-image.sh
index 421a3ed..d5bf54b 100755
--- a/build-image.sh
+++ b/build-image.sh
@@ -17,6 +17,9 @@ extra_args=""
 if [ ! -z "${INVALIDATE_CACHE_UPSTREAM_ARCHLINUX+x}" ]; then
   log "Fetching upstream package version from Arch Linux"
   upstream_ver="$(get_archlinux_pkg_ver "$INVALIDATE_CACHE_UPSTREAM_ARCHLINUX")"
+elif [ ! -z "${INVALIDATE_CACHE_UPSTREAM_AUR+x}" ]; then
+  log "Fetching upstream package version from AUR"
+  upstream_ver="$(get_aur_pkg_ver "$INVALIDATE_CACHE_UPSTREAM_AUR")"
 elif [ ! -z "${INVALIDATE_CACHE_UPSTREAM_UBUNTU+x}" ]; then
   log "Fetching upstream package version from Ubuntu (Launchpad)"
   upstream_ver="$(get_ubuntu_pkg_ver "$INVALIDATE_CACHE_UPSTREAM_UBUNTU")"
diff --git a/functions.sh b/functions.sh
index 8a5e7ae..72ddcca 100644
--- a/functions.sh
+++ b/functions.sh
@@ -126,6 +126,10 @@ get_archlinux_pkg_ver() {
   curl https://archlinux.org/packages/$1/json/ 2>/dev/null | jq -r '. | .pkgver + "-" + .pkgrel'
 }
 
+get_aur_pkg_ver() {
+  curl "https://aur.archlinux.org/rpc/v5/info?arg[]=$1" 2>/dev/null | jq -r '.results[0].Version'
+}
+
 # Note: this does not specify which version of Ubuntu to use, because we don't actually care
 # this version can and will only used to invalidate Docker cache, and we only need a vague
 # idea of whether this package has been updated upstream.