Re: [uml-devel] /var/run vs hostfs

[Jeff D. <jd...@ka...>]

mc...@sa... said:
> If you have / as a hostfs (via ubd0=somedir), then daemons which wish
> to open Unix domain sockets in /var/run fail because one is not
> permitted to make sockets via mknod(2) on the host file system...

Yup.  The semantics of hostfs inside UML are not a perfect match for the local 
filesystem on the host, mostly due to permissions.  You are root in UML, but 
there are things you can't do in a hostfs filesystem.  hostfs is similar to
NFS in this regard.

There's been some mumbling here about fixing that by putting changes that you 
aren't allowed to do for real inside magic files and having hostfs use the
information in those file over what's in the actual filesystem.  So, if you 
mknod a device file, this will cause a new entry to go in a file rather than 
attempting (and failing) to do a mknod on the host.  Then readdir will see 
that a device node "exists" and make it appear to be real.

				Jeff