From 5a08cc71a068545032e2a1c1bb189a73cd8559f6 Mon Sep 17 00:00:00 2001
From: Roland Clobus <rclobus@rclobus.nl>
Date: Wed, 19 Jan 2022 22:30:18 +0100
Subject: [PATCH] Add hook for libxmlb2 (used by appstream)

Caused by appstreamcli refresh-cache in package appstream (the
apt-conf/50appstream file)
Fixed upstream in libxmlb in https://github.com/hughsie/libxmlb/commit/0652ec042cc0611b9b98e080e64e1025db9b4183
---
 ...eproducible-libxmlb2-appstream.hook.chroot | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100755 examples/hooks/reproducible/1005-reproducible-libxmlb2-appstream.hook.chroot

diff --git a/examples/hooks/reproducible/1005-reproducible-libxmlb2-appstream.hook.chroot b/examples/hooks/reproducible/1005-reproducible-libxmlb2-appstream.hook.chroot
new file mode 100755
index 000000000..9d786de60
--- /dev/null
+++ b/examples/hooks/reproducible/1005-reproducible-libxmlb2-appstream.hook.chroot
@@ -0,0 +1,53 @@
+#!/bin/sh
+set -e
+
+# libxmlb2 creates random GUIDs
+# See https://github.com/hughsie/libxmlb/issues/110
+# Fixed upstream: https://github.com/hughsie/libxmlb/commit/0652ec042cc0611b9b98e080e64e1025db9b4183
+# Not released in Debian yet
+#
+# Until a sufficiently new version is installed, apply the work-around
+
+# Don't run if libxmlb2 is not installed
+if [ ! -e /usr/share/doc/libxmlb2 ];
+then
+  exit 0
+fi
+
+# Don't run if AppStream is not installed
+if [ ! -e /usr/bin/appstreamcli ];
+then
+  exit 0
+fi
+
+# Don't run if the version of libxmlb2 is sufficiently new
+if [ $(dpkg --compare-versions $(dpkg-query --show --showformat '${Version}\n' libxmlb2 | head -1) le 0.3.6-2) ];
+then
+  exit 0
+fi
+
+# Refresh the compressed XML files
+appstreamcli refresh --force > /dev/null
+
+# Set the GUID field for each compressed XML file to zero
+for f in $(ls /var/cache/app-info/cache/*.xb);
+do
+  dd if=$f of=tmp.xb count=8 iflag=count_bytes status=none
+  dd if=/dev/zero of=tmp.xb count=16 iflag=count_bytes status=none oflag=append conv=notrunc
+  dd if=$f of=tmp.xb skip=24 iflag=skip_bytes status=none oflag=append conv=notrunc
+  rm $f
+  mv tmp.xb $f
+done
+
+# When apt update is invoked, 50appstream calls 'appstreamcli refresh'
+# so add another hook to reset the guid again
+#
+# Before the chroot is finalised, 'apt update' is invoked again, so the reset guid step needs to be re-applied
+cat << EOF > /etc/apt/apt.conf.d/51appstream_reset_guid
+# Reset the GUID of the AppStream cache files when APT's cache is updated (i.e. apt update)
+APT::Update::Post-Invoke-Success {
+    "if /usr/bin/test -w /var/cache/app-info -a -e /usr/bin/appstreamcli; then for f in \$(ls /var/cache/app-info/cache/*.xb); do dd if=\$f of=tmp.xb count=8 iflag=count_bytes status=none; dd if=/dev/zero of=tmp.xb count=16 iflag=count_bytes status=none oflag=append conv=notrunc; dd if=\$f of=tmp.xb skip=24 iflag=skip_bytes status=none oflag=append conv=notrunc; rm \$f; mv tmp.xb \$f; done; fi";
+};
+EOF
+
+echo "P: $(basename $0) Reproducible hook has been applied"