$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Most.git /var/lib/mock/f45-build-26767-619/root/chroot_tmpdir/scmroot/perl-Test-Most
Cloning into '/var/lib/mock/f45-build-26767-619/root/chroot_tmpdir/scmroot/perl-Test-Most'...
$ git fetch origin 4f5f366b75ba6203799fde0243100914ada787a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Most
 * [new ref]         4f5f366b75ba6203799fde0243100914ada787a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4f5f366 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild