$ git clone -n https://src.fedoraproject.org/rpms/google-gson.git /var/lib/mock/f40-build-2314475-57810/root/chroot_tmpdir/scmroot/google-gson
Cloning into '/var/lib/mock/f40-build-2314475-57810/root/chroot_tmpdir/scmroot/google-gson'...
$ git fetch origin 21f999a8e586bed8725ae668ccc80e90fdb9c0bb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/google-gson
 * [new ref]         21f999a8e586bed8725ae668ccc80e90fdb9c0bb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21f999a Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild