$ git clone -n https://src.fedoraproject.org/rpms/perl-Alien-Libxml2.git /var/lib/mock/f33-build-632757-68296/root/chroot_tmpdir/scmroot/perl-Alien-Libxml2
Cloning into '/var/lib/mock/f33-build-632757-68296/root/chroot_tmpdir/scmroot/perl-Alien-Libxml2'...
$ git reset --hard cd93ead8ec96ee6c2d28ebec30f3a3635dc5e6a8
HEAD is now at cd93ead Rebuild against libxml2-2.9.12