On Thu, 2013-09-05 at 11:45 +0100, Burton, Ross wrote: > On 5 September 2013 11:20, Burton, Ross <ross.bur...@intel.com> wrote: > > I've also decided that maybe systemd isn't being quite as clever as it > > should and maybe fixing it there is the real fix. > > s/systemd/Linux/. > > The bug is that doing a "df" on a qemu systemd image results in it > attempting to automount /proc/sys/fs/binfmt_misc. The automount unit > has ConditionPathExists=/proc/sys/fs/binfmt_misc/ to stop it > attempting to automount when binfmt is disabled but hooray Linux if > binfmt_misc is a module that directory exists even when the module > isn't actually loaded, giving a no such device error when accessed. > The intention here I believe is so that an access to that directory > can invoke an automounter (systemd, in this case) which can then load > the modules and mount the virtual filesystem. > > There appear to be two options. > > 1) The QA scripts ignore any binfmt_misc unit mounts failing > 2) systemd RRECOMMENDS kernel-module-binfmt-misc > > (the third option of teaching systemd how to recognise this situation > and refuse to start the unit appears impossible) >
I honestly like second option more. And the third even better :) (sure changing the test to ignore binfmt_misc unit from systemctl --failed output can be easily done, but seems like just hiding the fail to me). I just tested that the third option can be done (for this case at least) by changing ConditionPathExists=/proc/sys/fs/binfmt_misc/ to ConditionDirectoryNotEmpty=/proc/sys/fs/binfmt_misc/ for proc-sys-fs-binfmt_misc.automount unit file and "df" doesn't complain as it doesn't attempt to automount anymore. On a system which does have that module loaded there are two files there so that's why the condition works. Cheers, Stefan > (CCing Stefan for his input) > > To be honest I'm leaning towards (1) right now as binfmt_misc is only > required in specific situations. > > Ross _______________________________________________ Openembedded-core mailing list Openembedded-core@lists.openembedded.org http://lists.openembedded.org/mailman/listinfo/openembedded-core
