$ git clone -n https://src.fedoraproject.org/rpms/penguin-command.git /var/lib/mock/f45-build-21526-586/root/chroot_tmpdir/scmroot/penguin-command
Cloning into '/var/lib/mock/f45-build-21526-586/root/chroot_tmpdir/scmroot/penguin-command'...
$ git fetch origin 711d95ecd1b09e0274bdcc8287979c556685cc10:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/penguin-command
 * [new ref]         711d95ecd1b09e0274bdcc8287979c556685cc10 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 711d95e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild