$ git clone -n https://src.fedoraproject.org/rpms/advancecomp.git /var/lib/mock/f40-build-2194980-51502/root/chroot_tmpdir/scmroot/advancecomp
Cloning into '/var/lib/mock/f40-build-2194980-51502/root/chroot_tmpdir/scmroot/advancecomp'...
$ git fetch origin 93f35b31735e4362bcf2129cf03f6d1a6eeaaa8b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/advancecomp
 * [new ref]         93f35b31735e4362bcf2129cf03f6d1a6eeaaa8b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 93f35b3 Update to 2.6 (close RHBZ#2243085)