$ git clone -n https://src.fedoraproject.org/rpms/gnuchess.git /var/lib/mock/f42-flatpak-app-build-59204029-6571838/root/chroot_tmpdir/scmroot/gnuchess
Cloning into '/var/lib/mock/f42-flatpak-app-build-59204029-6571838/root/chroot_tmpdir/scmroot/gnuchess'...
$ git fetch origin 5a09a85e83172cde7f8cc9767893855675bc6359:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnuchess
 * [new ref]         5a09a85e83172cde7f8cc9767893855675bc6359 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a09a85 6.2.11