$ git clone -n https://src.fedoraproject.org/rpms/perl-Atomic-Pipe.git /var/lib/mock/f45-build-21775-588/root/chroot_tmpdir/scmroot/perl-Atomic-Pipe
Cloning into '/var/lib/mock/f45-build-21775-588/root/chroot_tmpdir/scmroot/perl-Atomic-Pipe'...
$ git fetch origin e7784da31fcfd034fcaf055153d1783a80f909f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Atomic-Pipe
 * [new ref]         e7784da31fcfd034fcaf055153d1783a80f909f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7784da Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild