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ignition-ostree: make sure we don't mount /sysroot before transposefs #2526

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Aug 1, 2023
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ignition-ostree: make sure we don't mount /sysroot before transposefs #2526

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5 changes: 5 additions & 0 deletions ...r/lib/dracut/modules.d/40ignition-ostree/ignition-ostree-transposefs-autosave-xfs.service
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,11 @@ After=ignition-disks.service
# Avoid racing with UUID regeneration
After=ignition-ostree-uuid-root.service
After=ignition-ostree-growfs.service
Before=initrd-root-fs.target
Comment on lines 7 to +8
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OK now that I look I think I'm starting to understand this better. Before this PR, we only had Before=ignition-ostree-transposefs-restore.service on this service, which is itself just Before=ignition-ostree-mount-firstboot-sysroot.service.

Yet that service is just a no-op if we have a root kernel argument.

So there were no constraints and we just end up racing.

So the multipath bits exposed this core race condition because it is done via a root= karg.

# https://issues.redhat.com/browse/OCPBUGS-16157
# On multipath systems mounting the /sysroot before
# the ignition-ostree services causes the transpose to fai.
Before=sysroot.mount
Before=ignition-ostree-transposefs-restore.service
OnFailure=emergency.target
OnFailureJobMode=isolate
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5 changes: 5 additions & 0 deletions ...re/usr/lib/dracut/modules.d/40ignition-ostree/ignition-ostree-transposefs-restore.service
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,11 @@ After=ignition-disks.service
After=ignition-ostree-uuid-root.service
After=ignition-ostree-growfs.service
Before=ignition-ostree-mount-firstboot-sysroot.service
# https://issues.redhat.com/browse/OCPBUGS-16157
# On multipath systems mounting the /sysroot before
# the ignition-ostree services causes the transpose to fai.
Before=initrd-root-fs.target
Before=sysroot.mount
Comment on lines +12 to +13
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This is 100% fine, but I'd note that normally sysroot.mount is itself Before=initrd-root-fs.target, so we could just be Before=sysroot.mount too.

Or maybe the simple way to say it is: anywhere we have Before=ignition-ostree-mount-firstboot-sysroot.service we also need Before=sysroot.mount.

OnFailure=emergency.target
OnFailureJobMode=isolate

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5 changes: 5 additions & 0 deletions ...5core/usr/lib/dracut/modules.d/40ignition-ostree/ignition-ostree-transposefs-save.service
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,11 @@ ConditionKernelCommandLine=ostree
ConditionPathIsDirectory=/run/ignition-ostree-transposefs
# Any services looking at mounts need to order after this
# because it causes device re-probing.
# https://issues.redhat.com/browse/OCPBUGS-16157
# On multipath systems mounting the /sysroot before
# the ignition-ostree services causes the transpose to fai.
Before=initrd-root-fs.target
Before=sysroot.mount
After=coreos-gpt-setup.service
OnFailure=emergency.target
OnFailureJobMode=isolate
Expand Down