$ git clone -n https://src.fedoraproject.org/rpms/gentoo.git /var/lib/mock/f42-build-3364203-45044/root/chroot_tmpdir/scmroot/gentoo
Cloning into '/var/lib/mock/f42-build-3364203-45044/root/chroot_tmpdir/scmroot/gentoo'...
$ git fetch origin 5f1b4794c2d9be3593715ae174432b968c9eead6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gentoo
 * [new ref]         5f1b4794c2d9be3593715ae174432b968c9eead6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f1b479 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild