$ git clone -n https://src.fedoraproject.org/rpms/chocolate-doom.git /var/lib/mock/f41-build-side-1-2633020-25878/root/chroot_tmpdir/scmroot/chocolate-doom
Cloning into '/var/lib/mock/f41-build-side-1-2633020-25878/root/chroot_tmpdir/scmroot/chocolate-doom'...
$ git fetch origin 54dfbf0eb7deeaec4b8d690e8c5694d014a910ee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/chocolate-doom
 * [new ref]         54dfbf0eb7deeaec4b8d690e8c5694d014a910ee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 54dfbf0 Fix .desktop files of non-existent executables