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From 1e7a27bd5f463409392d34816a10bf108ee896c6 Mon Sep 17 00:00:00 2001
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From: Jonathan Lebon <jonathan@jlebon.com>
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Date: Fri, 9 Oct 2020 19:44:35 -0400
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Subject: [PATCH] 98dracut-systemd: don't wait for root device if remote
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cryptsetup active
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This is a plain and simple hack around dependency issues between dracut
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and systemd.
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When using Tang-pinned LUKS root devices, we want to rely on
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`systemd-cryptsetup@.service` to unlock it. However, that service only
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runs `After=remote-fs-pre.target`, while `dracut-initqueue.service` has
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`Before=remote-fs-pre.target` (which makes sense because we don't want
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to attempt networked root devices before networking is up).
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However, the rootfs-generator here wants to make sure that the root
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device exists *before* exiting the initqueue via an initqueue/finished
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"devexists" hook. This will never work though because by design
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`systemd-cryptsetup@.service`, which unlocks the root device, won't run
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until after we exit.
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So we have a dependency cycle:
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initqueue -> devexists hook -> root device ->
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systemd-cryptsetup@.service -> remote-fs-pre.target -> initqueue
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There's no clean way to break this. The root issue is that there's no
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way right now to split sequencing of systemd services across the
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initqueue/online and initqueue/finished events because it's all bundled
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in a single service. (The deeper root issue of course is that we have
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two init systems. :) ).
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Here we do a tactical fix: if there's a `systemd-cryptsetup@.service`
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instance, let's assume it's for the root device and skip waiting for it
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to show up if it depends on `remote-fs-pre.target`.
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(cherry picked from commit 512c51d2677dd1637cc203e3676fefb50a3d73d0)
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Resolves: #1897384
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---
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modules.d/98dracut-systemd/rootfs-generator.sh | 11 +++++++++--
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1 file changed, 9 insertions(+), 2 deletions(-)
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diff --git a/modules.d/98dracut-systemd/rootfs-generator.sh b/modules.d/98dracut-systemd/rootfs-generator.sh
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index 4ae693bb..bb376c0f 100755
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--- a/modules.d/98dracut-systemd/rootfs-generator.sh
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+++ b/modules.d/98dracut-systemd/rootfs-generator.sh
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@@ -13,8 +13,15 @@ generator_wait_for_dev()
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if ! [ -e "$hookdir/initqueue/finished/devexists-${_name}.sh" ]; then
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- printf '[ -e "%s" ]\n' $1 \
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- >> "$hookdir/initqueue/finished/devexists-${_name}.sh"
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+ # If a LUKS device needs unlocking via systemd in the initrd, assume
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+ # it's for the root device. In that case, don't block on it if it's
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+ # after remote-fs-pre.target since the initqueue is ordered before it so
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+ # it will never actually show up (think Tang-pinned rootfs).
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+ cat > "$hookdir/initqueue/finished/devexists-${_name}.sh" << EOF
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+if ! grep -q After=remote-fs-pre.target /run/systemd/generator/systemd-cryptsetup@*.service 2>/dev/null; then
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+ [ -e "$1" ]
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+fi
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+EOF
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{
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printf '[ -e "%s" ] || ' $1
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printf 'warn "\"%s\" does not exist"\n' $1
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