$ git clone -n https://src.fedoraproject.org/rpms/american-fuzzy-lop.git /var/lib/mock/f40-build-801068-143697/root/chroot_tmpdir/scmroot/american-fuzzy-lop
Cloning into '/var/lib/mock/f40-build-801068-143697/root/chroot_tmpdir/scmroot/american-fuzzy-lop'...
$ git fetch origin 8bdb70bd778635494eff36e70d3ca4d77d675bab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/american-fuzzy-lop
 * [new ref]         8bdb70bd778635494eff36e70d3ca4d77d675bab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8bdb70b New upstream release 4.10c (RHBZ#2262539)