$ git clone -n https://src.fedoraproject.org/rpms/mpibash.git /var/lib/mock/f42-build-3533013-46329/root/chroot_tmpdir/scmroot/mpibash
Cloning into '/var/lib/mock/f42-build-3533013-46329/root/chroot_tmpdir/scmroot/mpibash'...
$ git fetch origin b21c708b5b90b315453095ac4440c2e61fa4eea7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mpibash
 * [new ref]         b21c708b5b90b315453095ac4440c2e61fa4eea7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b21c708 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild