$ git clone -n https://src.fedoraproject.org/rpms/perl-IPC-Run.git /var/lib/mock/f45-build-24209-602/root/chroot_tmpdir/scmroot/perl-IPC-Run
Cloning into '/var/lib/mock/f45-build-24209-602/root/chroot_tmpdir/scmroot/perl-IPC-Run'...
$ git fetch origin 17a88db07ef15e03ea8ff4e3d78c333f7794c365:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-IPC-Run
 * [new ref]         17a88db07ef15e03ea8ff4e3d78c333f7794c365 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 17a88db Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild