$ git clone -n https://src.fedoraproject.org/rpms/libx86emu.git /var/lib/mock/f42-build-side-1-3498662-45963/root/chroot_tmpdir/scmroot/libx86emu
Cloning into '/var/lib/mock/f42-build-side-1-3498662-45963/root/chroot_tmpdir/scmroot/libx86emu'...
$ git fetch origin 5e330997c2846f2208f74bcb404a4e497a8fbbd6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libx86emu
 * [new ref]         5e330997c2846f2208f74bcb404a4e497a8fbbd6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5e33099 Update to 3.7