Re: [PATCH 04/13] libsemanage: split final files into /var/lib/selinux/tmp

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On Wed, 2009-12-23 at 18:25 -0500, Caleb Case wrote:
> This patch moves the final files from inside
> /var/lib/selinux/<store>/[active|previous|tmp] to
> /var/lib/selinux/tmp/<store>. The move is done to facilitate using
> source control management on the /var/lib/selinux/<store> directory. If
> these files remain in /var/lib/selinux/<store> they will pose a size
> problem if an SCM like git is used as we'd be storing lots of binary
> diffs. We are suggesting making this change now, rather than later when
> source policy, SCM, and CIL[1] support are available, to ease the
> migration burden.
> 
> These are the files that have been moved:
> 
> /var/lib/selinux/<store>/active/...	/var/lib/selinux/tmp/<store>/...
> 
> file_contexts				contexts/files/file_contexts
> file_contexts.homedirs			contexts/files/file_contexts.homedirs
> file_contexts.local			contexts/files/file_contexts.local
> netfilter_contexts			contexts/netfilter_contexts
> policy.kern				policy/policy.<policyversion>
> seusers.final				seusers
> 
> The layout of these files in /var/lib/selinux/tmp/<store> is designed to
> mirror their locations in /etc/selinux/<store>. This should help clarify
> the relationship between these final files and the files installed in
> etc.
> 
> One consequence of this move is that reverting to the previous policy
> version requires a policy rebuild. Currently you can revert without
> rebuilding.

That seems a little worrisome to me, as a rebuild might fail, e.g. what
happens if we abort a transaction due to a lack of disk space and then
try to revert, requiring a rebuild, only to run out of space during the
rebuild?

-- 
Stephen Smalley
National Security Agency


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