$ git clone -n https://src.fedoraproject.org/rpms/bcc.git /var/lib/mock/eln-build-side-110632-59045238-6570607/root/chroot_tmpdir/scmroot/bcc
Cloning into '/var/lib/mock/eln-build-side-110632-59045238-6570607/root/chroot_tmpdir/scmroot/bcc'...
$ git fetch origin e0ae3bc731c7f91ca9a1ca2ff5c6bcdc2ec5e192:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bcc
 * [new ref]         e0ae3bc731c7f91ca9a1ca2ff5c6bcdc2ec5e192 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e0ae3bc Rebase bcc to version 0.34.0