$ git clone -n https://src.fedoraproject.org/rpms/chemtool.git /var/lib/mock/f40-build-2208944-52148/root/chroot_tmpdir/scmroot/chemtool
Cloning into '/var/lib/mock/f40-build-2208944-52148/root/chroot_tmpdir/scmroot/chemtool'...
$ git fetch origin c6dcd0259c9f734bf0a4ac3765f40ddc750443eb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/chemtool
 * [new ref]         c6dcd0259c9f734bf0a4ac3765f40ddc750443eb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c6dcd02 correct build requirement on KDE