$ git clone -n https://src.fedoraproject.org/rpms/isoimagewriter.git /var/lib/mock/f40-build-2274934-55042/root/chroot_tmpdir/scmroot/isoimagewriter
Cloning into '/var/lib/mock/f40-build-2274934-55042/root/chroot_tmpdir/scmroot/isoimagewriter'...
$ git fetch origin 4c453a96a605ab018ff52086e7b114183ff3676e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/isoimagewriter
 * [new ref]         4c453a96a605ab018ff52086e7b114183ff3676e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4c453a9 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild