$ git clone -n https://src.fedoraproject.org/rpms/marble.git /var/lib/mock/f38-build-side-42-init-devel-627798-26370/root/chroot_tmpdir/scmroot/marble
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-627798-26370/root/chroot_tmpdir/scmroot/marble'...
$ git fetch origin 0252a0456947f5cd01a5fd795123392c4093406e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/marble
 * [new ref]         0252a0456947f5cd01a5fd795123392c4093406e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0252a04 Fix flatpak build