$ git clone -n https://src.fedoraproject.org/rpms/spherical-cow-backgrounds.git /var/lib/mock/f40-build-2326633-58839/root/chroot_tmpdir/scmroot/spherical-cow-backgrounds
Cloning into '/var/lib/mock/f40-build-2326633-58839/root/chroot_tmpdir/scmroot/spherical-cow-backgrounds'...
$ git fetch origin 4d134319aaa0bc1254601447fff878ade3cefe18:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/spherical-cow-backgrounds
 * [new ref]         4d134319aaa0bc1254601447fff878ade3cefe18 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4d13431 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild