$ git clone -n https://src.fedoraproject.org/rpms/julia.git /var/lib/mock/f39-build-2512941-61701/root/chroot_tmpdir/scmroot/julia
Cloning into '/var/lib/mock/f39-build-2512941-61701/root/chroot_tmpdir/scmroot/julia'...
$ git fetch origin 54145347e78de47bdc630256caf6fb52b8231ae4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/julia
 * [new ref]         54145347e78de47bdc630256caf6fb52b8231ae4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5414534 Another attempt