$ git clone -n https://src.fedoraproject.org/rpms/ldc.git /var/lib/mock/f39-build-2354083-60268/root/chroot_tmpdir/scmroot/ldc
Cloning into '/var/lib/mock/f39-build-2354083-60268/root/chroot_tmpdir/scmroot/ldc'...
$ git fetch origin 8938f27048508398481a92ae8fcf379ecd0c5a1e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ldc
 * [new ref]         8938f27048508398481a92ae8fcf379ecd0c5a1e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8938f27 Disable bootstrap