$ git clone -n https://src.fedoraproject.org/rpms/rubygem-gist.git /var/lib/mock/f40-build-2322690-58675/root/chroot_tmpdir/scmroot/rubygem-gist
Cloning into '/var/lib/mock/f40-build-2322690-58675/root/chroot_tmpdir/scmroot/rubygem-gist'...
$ git fetch origin b4fa056fa680e1a959a77a2f8b3d7f2e6a75cebf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-gist
 * [new ref]         b4fa056fa680e1a959a77a2f8b3d7f2e6a75cebf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4fa056 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild