$ git clone -n https://src.fedoraproject.org/rpms/perl-Text-vCard.git /var/lib/mock/f45-build-27169-621/root/chroot_tmpdir/scmroot/perl-Text-vCard
Cloning into '/var/lib/mock/f45-build-27169-621/root/chroot_tmpdir/scmroot/perl-Text-vCard'...
$ git fetch origin 2480e50108e0d0c75f718b9507f9d1f2c99ff001:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Text-vCard
 * [new ref]         2480e50108e0d0c75f718b9507f9d1f2c99ff001 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2480e50 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild