On Wed, 2016-06-29 at 11:34 +0100, Daniel P. Berrange wrote: > 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
Just an idea: Would it make sense to build the qemu-user binary so that it looks in a different /lib directory (using rpath) like /lib/qemu-user-systemlib, and then symlink into that directory the libraries it needs from the host ? That way if you use chroot and bind mount in that directory in the right place the qemu-user binary uses different libraries from the emulated binaries yet you do not have to resort to static linking. Simo. -- Simo Sorce * Red Hat, Inc * New York -- devel mailing list devel@lists.fedoraproject.org https://lists.fedoraproject.org/admin/lists/devel@lists.fedoraproject.org
