Re: RFC: static builds for user emulators in Fedora QEMU RPMs

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On Wed, Jun 29, 2016 at 12:15:02PM +0200, Florian Weimer wrote:
> On 06/29/2016 12:03 PM, Daniel P. Berrange wrote:
> > Debian handles this by having several packages [1]
> > 
> >  - qemu-user - the dynamic linked qemu user binaries
> >  - qemu-binfmt - binfmt rules registering the dynamic linked binaries
> >  - qemu-user-static - the static linked qemu user binaries *and* binfmt
> >                       rules to register them. The static binaries all
> > 		      have -static suffix on their name
> 
> Debian builds static libraries and puts them into their -dev packages.
> Fedora does not do this systematically.  Are all the static libraries you
> need actually available in Fedora?

Yes, everything we need exists - as mentioned its only glibc-static,
glib2-static, zlib-static and pcre-static that we need for this.

> An alternative would be to bind-mount the real file system into the chroot
> and run the native dynamic linker with a --library-path command line
> argument that specifies the library directories in the bind mount. (It's
> reasonable to specify --inhibit-cache as well.)  This would need some
> adjustments in the binfmt wrapper.

The binfmt registrations are global to the OS, so the same binfmt command
needs to work whether inside or outside the chroot. So a scheme which
requires us to pass special args to make the linker looks elsewhere when
inside the chroot is not so easy. We'd have to create a wrapper program
around the real qemu user binary that decides which args to pass to the
linker, and that wrapper would then have to be statically linked

Regards,
Daniel
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