$ git clone -n https://src.fedoraproject.org/rpms/perl-Future-IO.git /var/lib/mock/f45-build-23762-599/root/chroot_tmpdir/scmroot/perl-Future-IO
Cloning into '/var/lib/mock/f45-build-23762-599/root/chroot_tmpdir/scmroot/perl-Future-IO'...
$ git fetch origin 1c1c1a9e0b56bfb95c8c6cc4e02a0667854456f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Future-IO
 * [new ref]         1c1c1a9e0b56bfb95c8c6cc4e02a0667854456f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1c1c1a9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild