$ git clone -n https://src.fedoraproject.org/rpms/yasm.git /var/lib/mock/f45-build-39257-733/root/chroot_tmpdir/scmroot/yasm
Cloning into '/var/lib/mock/f45-build-39257-733/root/chroot_tmpdir/scmroot/yasm'...
$ git fetch origin 6436ea0d411936b71257c663949115539078433f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/yasm
 * [new ref]         6436ea0d411936b71257c663949115539078433f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6436ea0 Remove stale 'xmlto' BuildRequires