$ git clone -n https://src.fedoraproject.org/rpms/ldc.git /var/lib/mock/f38-build-side-42-init-devel-1052356-29763/root/chroot_tmpdir/scmroot/ldc
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1052356-29763/root/chroot_tmpdir/scmroot/ldc'...
$ git fetch origin 42f2f788053aadc7ef5a23f848cb3cca05c226c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ldc
 * [new ref]         42f2f788053aadc7ef5a23f848cb3cca05c226c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 42f2f78 Disable bootstrap