$ git clone -n https://src.fedoraproject.org/rpms/ytalk.git /var/lib/mock/f45-build-39274-733/root/chroot_tmpdir/scmroot/ytalk
Cloning into '/var/lib/mock/f45-build-39274-733/root/chroot_tmpdir/scmroot/ytalk'...
$ git fetch origin 8b791b928a1ba979332a278c10efa8c6d47d5d5c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ytalk
 * [new ref]         8b791b928a1ba979332a278c10efa8c6d47d5d5c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b791b9 drop ix86 support