$ git clone -n https://src.fedoraproject.org/rpms/libbs2b.git /var/lib/mock/f41-build-1028899-18369/root/chroot_tmpdir/scmroot/libbs2b
Cloning into '/var/lib/mock/f41-build-1028899-18369/root/chroot_tmpdir/scmroot/libbs2b'...
$ git fetch origin 7ac2ba65ef5ae30cadabea4196b3883ad2b6a83f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libbs2b
 * [new ref]         7ac2ba65ef5ae30cadabea4196b3883ad2b6a83f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7ac2ba6 Eliminate use of obsolete %patchN syntax (#2283636)