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CAP_MKNOD
npsawn containers generally have CAP_MKNOD, since this is required
to make PrviateDevices= work. Thus, it's not useful anymore to
conditionalize the kmod static device node units.
Use CAP_SYS_MODULES instead which is not available for nspawn
containers. However, the static device node logic is only done for being
able to autoload modules with it, and if we can't do that there's no
point in doing it.
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This is no longer necessary with kmod-15. Bump the requirement.
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Fixes errors seen when booting VMs on QEMU like
systemd[1]: kmod-static-nodes.service: main process exited, code=exited, status=203/EXEC
systemd[1]: Failed to start Create list of required static device nodes for the current kernel.
systemd[1]: Unit kmod-static-nodes.service entered failed state.
Make sure that mknod capability is available
Signed-off-by: Khem Raj <raj.khem@gmail.com>
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Fixes https://bugzilla.redhat.com/show_bug.cgi?id=998122.
Note: upstream kmod has a patch [1] to exit with a warning if
modules.devname is missing. We could use new %v specifier to make this
service conditional on the existence of this file, but this could
mask a kernel installation error, hence we should let kmod run
even if the file doesn't exist.
[1] http://git.kernel.org/cgit/utils/kernel/kmod/kmod.git/commit/?id=ae17710117
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As of kmod v14, it is possible to export the static node information from
/lib/modules/`uname -r`/modules.devname in tmpfiles.d(5) format.
Use this functionality to let systemd-tmpfilesd create the static device nodes
at boot, and drop the functionality from systemd-udevd.
As an effect of this we can move from systemd-udevd to systemd-tmpfiles-setup-dev:
* the conditional CAP_MKNOD (replaced by checking if /sys is mounted rw)
* ordering before local-fs-pre.target (see 89d09e1b5c65a2d97840f682e0932c8bb499f166)
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