$ git clone -n https://github.com/xcp-ng-rpms/autoconf.git /var/lib/mock/v8.3-incoming-11000-29436/root/chroot_tmpdir/scmroot/autoconf
Cloning into '/var/lib/mock/v8.3-incoming-11000-29436/root/chroot_tmpdir/scmroot/autoconf'...
$ git fetch origin d820692fee7b2a0ab49a31a7544e9750e41afd14:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/autoconf
 * [new ref]         d820692fee7b2a0ab49a31a7544e9750e41afd14 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d820692 Import autoconf-2.71-2.xs8.src.rpm