$ git clone -n https://src.fedoraproject.org/rpms/perl-Email-Address-XS.git /var/lib/mock/f45-build-23286-596/root/chroot_tmpdir/scmroot/perl-Email-Address-XS
Cloning into '/var/lib/mock/f45-build-23286-596/root/chroot_tmpdir/scmroot/perl-Email-Address-XS'...
$ git fetch origin 8e15474fa1e1021c2348a461652da4bb0fc06dc9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Email-Address-XS
 * [new ref]         8e15474fa1e1021c2348a461652da4bb0fc06dc9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8e15474 Perl 5.44 rebuild