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If emergency.target is started while initrd-parse-etc.service/start is queued, the initrd-parse-etc job did not get canceled. In parallel to the emergency units, it eventually runs the service, which starts initrd-cleanup.service, which in turn isolates initrd-switch-root.target. This stops the emergency units and effectively starts the initrd boot process again, which likely fails again like the initial attempt. The system is thus stuck in an endless loop, never really reaching emergency.target. With this conflict added, starting emergency.target automatically cancels initrd-parse-etc.service/start, avoiding the loop.
36 lines
1.2 KiB
SYSTEMD
36 lines
1.2 KiB
SYSTEMD
# SPDX-License-Identifier: LGPL-2.1-or-later
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#
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# This file is part of systemd.
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#
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# systemd is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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[Unit]
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Description=Mountpoints Configured in the Real Root
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AssertPathExists=/etc/initrd-release
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DefaultDependencies=no
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Requires=initrd-root-fs.target
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After=initrd-root-fs.target
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Conflicts=emergency.target
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OnFailure=emergency.target
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OnFailureJobMode=replace-irreversibly
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[Service]
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Type=oneshot
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# FIXME: once dracut is patched to install the symlink, change to:
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# ExecStart={{LIBEXECDIR}}/systemd-sysroot-fstab-check
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ExecStart=@{{SYSTEM_GENERATOR_DIR}}/systemd-fstab-generator systemd-sysroot-fstab-check
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# We want to enqueue initrd-cleanup.service/start after we finished the part
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# above. It can't be part of the initial transaction, because non-oneshot units
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# use Conflicts=initrd-cleanup.service to be terminated before we switch root.
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# Effectively, initrd-parse-etc.service acts as a synchronization point after
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# which cleanup of the initrd processes starts.
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ExecStart=systemctl --no-block start initrd-cleanup.service
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