fix(shutdown): be robust against forced shutdown

When a forced shutdown is issued through sending a burst of Ctrl-Alt-Del
keys, systemd sends SIGTERM to all processes. This ends up killing
dracut-initramfs-restore as well, preventing the script from detecting
that the unpack of the initramfs is incomplete, which later causes a
crash to happen when "shutdown" tries to execute from the unpacked
initramfs.

This fix makes sure dracut-initramfs-restore remains alive to detect
the unpack failed (because cpio was killed by systemd too).

Refs:
 * https://bugzilla.redhat.com/show_bug.cgi?id=2023665

diff --git a/dracut-initramfs-restore.sh b/dracut-initramfs-restore.sh
index abe6b1e206abe56c53e13680b94822af3e28120b..d97030a34fc1bafbde8558bf8b4d03f3499efbd9 100644 (file)
--- a/dracut-initramfs-restore.sh
+++ b/dracut-initramfs-restore.sh
@@ -6,6 +6,11 @@ set -e
 [ -e /run/initramfs/bin/sh ] && exit 0
 [ -e /run/initramfs/.need_shutdown ] || exit 0
 
+# SIGTERM signal is received upon forced shutdown: ignore the signal
+# We want to remain alive to be able to trap unpacking errors to avoid
+# switching root to an incompletely unpacked initramfs
+trap 'echo "Received SIGTERM signal, ignoring!" >&2' TERM
+
 KERNEL_VERSION="$(uname -r)"
 
 [[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut