$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-Smart.git /var/lib/mock/f45-build-27539-624/root/chroot_tmpdir/scmroot/perl-XML-Smart
Cloning into '/var/lib/mock/f45-build-27539-624/root/chroot_tmpdir/scmroot/perl-XML-Smart'...
$ git fetch origin 1ffe466bf233705b3a9f2102ab673ea9c6dea1f9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-Smart
 * [new ref]         1ffe466bf233705b3a9f2102ab673ea9c6dea1f9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ffe466 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild