$ git clone -n https://src.fedoraproject.org/rpms/diff-so-fancy.git /var/lib/mock/f39-build-1500918-34804/root/chroot_tmpdir/scmroot/diff-so-fancy
Cloning into '/var/lib/mock/f39-build-1500918-34804/root/chroot_tmpdir/scmroot/diff-so-fancy'...
$ git fetch origin 908881e65d36ef8700d58bd69a2f77214726acf8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/diff-so-fancy
 * [new ref]         908881e65d36ef8700d58bd69a2f77214726acf8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 908881e Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild