$ git clone -n https://src.fedoraproject.org/rpms/perl-Fedora-VSP.git /var/lib/mock/f45-build-23456-597/root/chroot_tmpdir/scmroot/perl-Fedora-VSP
Cloning into '/var/lib/mock/f45-build-23456-597/root/chroot_tmpdir/scmroot/perl-Fedora-VSP'...
$ git fetch origin eca9896aa1b9b3a7dab270907ef6c3ad975118ac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Fedora-VSP
 * [new ref]         eca9896aa1b9b3a7dab270907ef6c3ad975118ac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eca9896 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild