$ git clone -n https://github.com/fedora-riscv/extlinux-bootloader /var/lib/mock/f39-build-1874301-42728/root/chroot_tmpdir/scmroot/extlinux-bootloader
Cloning into '/var/lib/mock/f39-build-1874301-42728/root/chroot_tmpdir/scmroot/extlinux-bootloader'...
$ git fetch origin b35d87745def239b318d58460ea9dc698fc34cc9:KOJI_FETCH_HEAD
From https://github.com/fedora-riscv/extlinux-bootloader
 * [new ref]         b35d87745def239b318d58460ea9dc698fc34cc9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b35d877 Update extlinux-bootloader.spec