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From cecc1fbae879c189739691ecff3df67d20b0899a Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Renaud=20M=C3=A9trich?= <rmetrich@redhat.com>
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Date: Tue, 16 Nov 2021 11:15:52 +0100
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Subject: [PATCH] fix(shutdown): be robust against forced shutdown
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When a forced shutdown is issued through sending a burst of Ctrl-Alt-Del
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keys, systemd sends SIGTERM to all processes. This ends up killing
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dracut-initramfs-restore as well, preventing the script from detecting
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that the unpack of the initramfs is incomplete, which later causes a
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crash to happen when "shutdown" tries to execute from the unpacked
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initramfs.
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This fix makes sure dracut-initramfs-restore remains alive to detect
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the unpack failed (because cpio was killed by systemd too).
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Refs:
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* https://bugzilla.redhat.com/show_bug.cgi?id=2023665
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(cherry picked from commit b9ba3c8bb8f0f1328cd1ffaa8dbf64585b28c474)
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Resolves: #2024502
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---
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dracut-initramfs-restore.sh | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/dracut-initramfs-restore.sh b/dracut-initramfs-restore.sh
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index abe6b1e2..d97030a3 100644
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--- a/dracut-initramfs-restore.sh
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+++ b/dracut-initramfs-restore.sh
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@@ -6,6 +6,11 @@ set -e
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[ -e /run/initramfs/bin/sh ] && exit 0
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[ -e /run/initramfs/.need_shutdown ] || exit 0
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+# SIGTERM signal is received upon forced shutdown: ignore the signal
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+# We want to remain alive to be able to trap unpacking errors to avoid
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+# switching root to an incompletely unpacked initramfs
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+trap 'echo "Received SIGTERM signal, ignoring!" >&2' TERM
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+
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KERNEL_VERSION="$(uname -r)"
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[[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
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