$ git clone -n https://src.fedoraproject.org/rpms/ipxe.git /var/lib/mock/f40-build-2199421-51742/root/chroot_tmpdir/scmroot/ipxe
Cloning into '/var/lib/mock/f40-build-2199421-51742/root/chroot_tmpdir/scmroot/ipxe'...
$ git fetch origin 517efa2f1b38b4241a25d667e3f029fe90419fe0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ipxe
 * [new ref]         517efa2f1b38b4241a25d667e3f029fe90419fe0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 517efa2 Fix build with binutils 2.41