$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-Stream.git /var/lib/mock/f45-build-27544-624/root/chroot_tmpdir/scmroot/perl-XML-Stream
Cloning into '/var/lib/mock/f45-build-27544-624/root/chroot_tmpdir/scmroot/perl-XML-Stream'...
$ git fetch origin f5bfeff40386120ee7d3b43111a93b87c77834bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-Stream
 * [new ref]         f5bfeff40386120ee7d3b43111a93b87c77834bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f5bfeff Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild