Re: [libvirt] [PATCH] tests: Put a mock library at the start of LD_PRELOAD
On Tue, Jul 30, 2013 at 10:37:40 +0100, Daniel Berrange wrote:
On Tue, Jul 30, 2013 at 11:29:11AM +0200, Jiri Denemark wrote:
> This fixes vircgrouptest when run in a sandbox which already overrides
> open() and others.
In general I think that having multiple LD_PRELOADS overriding the
same symbols may well lead to pain.
We try to make it at least chain up the libraries by using the
'RTLD_NEXT' handle when looking up the "real" symbol, which
should make it forward to the next preloaded library. From
the sound of it, your sandbox tool isn't using RTLD_NEXT,
causing the libvirt override to be skipped when the order was
reversed.
I did some investigation and the sandbox actually uses RTLD_NEXT but
unfortunately searches for full symbols including their versions. Thus,
e.g., our implementation of fopen() is ignored because the sandbox wants
fopen(a)GLIBC_2.2.5.
ACK
Thanks and pushed.
Jirka