From 65c8e0638b90d619ea8450f37af832af9b657fd1 Mon Sep 17 00:00:00 2001
From: Christian Hesse <mail@eworm.de>
Date: Tue, 28 Jan 2020 11:16:55 +0100
Subject: act on specific packages on offline action only

This adds a configuration file /etc/pacman.d/offline.conf that can be
included to global pacman configuration file /etc/pacman.conf. By default
it contains configuration to ignore linux packages.

On offline action this include is removed, allowing to update linux
packages on offline action only. This prevents from breaking module
loading in a running system.
---
 Makefile               | 1 +
 bin/pacman-offline     | 9 +++++++--
 config/offline.conf    | 6 ++++++
 systemd/pacman-offline | 7 ++++++-
 4 files changed, 20 insertions(+), 3 deletions(-)
 create mode 100644 config/offline.conf

diff --git a/Makefile b/Makefile
index e587c7b..37bf3cb 100644
--- a/Makefile
+++ b/Makefile
@@ -17,6 +17,7 @@ all: README.html
 
 install:
 	$(INSTALL) -D -m0755 bin/pacman-offline $(DESTDIR)/usr/bin/pacman-offline
+	$(INSTALL) -D -m0644 config/offline.conf $(DESTDIR)/etc/pacman.d/offline.conf
 	$(INSTALL) -D -m0644 hook/99-pacman-offline.hook $(DESTDIR)/usr/share/libalpm/hooks/99-pacman-offline.hook
 	$(INSTALL) -D -m0644 systemd/pacman-offline.service $(DESTDIR)/usr/lib/systemd/system/pacman-offline.service
 	$(INSTALL) -D -m0755 systemd/pacman-offline $(DESTDIR)/usr/lib/systemd/scripts/pacman-offline
diff --git a/bin/pacman-offline b/bin/pacman-offline
index 534a0a9..0105f54 100755
--- a/bin/pacman-offline
+++ b/bin/pacman-offline
@@ -37,17 +37,22 @@ if [ -e '/system-update' -a "$(readlink '/system-update')" != '/var/cache/pacman
 	exit 1
 fi
 
+# exclude /etc/pacman.d/offline.conf
+function finish { rm -f /run/pacman.conf; }
+trap finish EXIT
+sed '/^Include *= *\/etc\/pacman\.d\/offline\.conf$/s|^|#|' < /etc/pacman.conf > /run/pacman.conf
+
 # remove the symlink for now, will be recreated it later
 rm -f /system-update
 
 # check for available updates
-if [ "$(pacman --sync --sysupgrade --print | wc -l)" -eq 0 ]; then
+if [ "$(pacman --config /run/pacman.conf --sync --sysupgrade --print | wc -l)" -eq 0 ]; then
 	echo "No updates available."
 	exit 0
 fi
 
 # download packages
-pacman --sync --noconfirm --sysupgrade --downloadonly
+pacman --config /run/pacman.conf --sync --noconfirm --sysupgrade --downloadonly
 
 # enable system update
 ln -sf /var/cache/pacman/pkg /system-update
diff --git a/config/offline.conf b/config/offline.conf
new file mode 100644
index 0000000..56f8b76
--- /dev/null
+++ b/config/offline.conf
@@ -0,0 +1,6 @@
+# Ingore linux packages and prevent breaking module loading. The include of
+# this configuration file is removed on offline action.
+IgnorePkg = linux linux-headers linux-docs
+IgnorePkg = linux-lts linux-lts-headers linux-lts-docs
+IgnorePkg = linux-zen linux-zen-headers linux-zen-docs
+IgnorePkg = linux-hardened linux-hardened-headers linux-hardened-docs
diff --git a/systemd/pacman-offline b/systemd/pacman-offline
index 3e9133b..39ed094 100755
--- a/systemd/pacman-offline
+++ b/systemd/pacman-offline
@@ -7,6 +7,11 @@ if [ "$(readlink '/system-update')" != '/var/cache/pacman/pkg' ]; then
 	exit 0
 fi
 
+# exclude /etc/pacman.d/offline.conf
+function finish { rm -f /run/pacman.conf; }
+trap finish EXIT
+sed '/^Include *= *\/etc\/pacman\.d\/offline\.conf$/s|^|#|' < /etc/pacman.conf > /run/pacman.conf
+
 # remove triggering symlink
 rm -f /system-update
 
@@ -14,7 +19,7 @@ rm -f /system-update
 if [ "$(pacman --sync  --print --needed archlinux-keyring | wc -l)" -gt 0 ]; then
 	pacman --sync --noconfirm archlinux-keyring
 fi
-pacman --sync --noconfirm --sysupgrade
+pacman --config /run/pacman.conf --sync --noconfirm --sysupgrade
 
 # clean up package cache
 pacman --sync --noconfirm --clean
-- 
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