70 lines
2.6 KiB
Diff
70 lines
2.6 KiB
Diff
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From 4c2d98c75b0dd3dad45430becb78c9d40bc6be1b Mon Sep 17 00:00:00 2001
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From: Martin Wilck <mwilck@suse.com>
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Date: Mon, 9 Oct 2017 14:39:12 +0200
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Subject: [PATCH] emergency.service: use Type=idle
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Type=oneshot, as currently set in dracut's emergency service file,
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causes an awkward situation if emergency mode is entered e.g. because
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of a root device timeout, and the root device appears later because it
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just has taken longer than the timeout. In that situation, my
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expectation (backed by past positive experience) is that the user should
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be able to simply exit the emergency shell and resume normal boot.
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:/# systemctl status sysroot.mount
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● sysroot.mount - /sysroot
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Loaded: loaded (/proc/cmdline; bad; vendor preset: enabled)
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Active: active (mounted) since Mon 2017-10-09 14:32:15 CEST; 16s ago
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Where: /sysroot
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What: /dev/mapper/3600601600a30200024fbbaf3f500e411-part5
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Docs: man:fstab(5)
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man:systemd-fstab-generator(8)
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Process: 1873 ExecMount=/usr/bin/mount /dev/disk/by-uuid/63751805-6abc-46a3-a66f-427920dece4d /sysroot -o ro (code=exited, status=0/SUCCESS)
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Tasks: 0 (limit: 512)
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:/# systemctl list-jobs
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JOB UNIT TYPE STATE
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56 emergency.target start waiting
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57 emergency.service start running
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2 jobs listed.
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:/# exit
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logout
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Failed to start default.target: Transaction is destructive.
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(system keeps idling from this point on, user has no chance to
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do anything).
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This results from the combination of two effects:
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1) initrd-root-fs.target sets "OnFailureJobMode=replace-irreversibly",
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2) emergency.service's Type=oneshot causes the start jobs for both
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emergency.service and emergency.target to persist while the user is in
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the emergency shell.
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When the shell is exited, systemd tries to isolate "initrd.target"
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again, but this fails with "the transaction is destructive" error
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because of the still pending jobs.
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This patch fixes this by changing the Type of "emergency.service" from
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"oneshot" to "idle".
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---
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modules.d/98dracut-systemd/emergency.service | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/modules.d/98dracut-systemd/emergency.service b/modules.d/98dracut-systemd/emergency.service
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index 288aac39..100146a3 100644
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--- a/modules.d/98dracut-systemd/emergency.service
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+++ b/modules.d/98dracut-systemd/emergency.service
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@@ -17,7 +17,7 @@ Environment=NEWROOT=/sysroot
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WorkingDirectory=/
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ExecStart=/bin/dracut-emergency
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ExecStopPost=-/usr/bin/systemctl --fail --no-block default
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-Type=oneshot
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+Type=idle
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StandardInput=tty-force
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StandardOutput=inherit
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StandardError=inherit
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