$ git clone -n https://src.fedoraproject.org/rpms/libbpf.git /var/lib/mock/f40-build-2241925-53669/root/chroot_tmpdir/scmroot/libbpf
Cloning into '/var/lib/mock/f40-build-2241925-53669/root/chroot_tmpdir/scmroot/libbpf'...
$ git fetch origin 70cfc1bd1de0f949020335b77480088058a11e5f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libbpf
 * [new ref]         70cfc1bd1de0f949020335b77480088058a11e5f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 70cfc1b fix changelog version