$ git clone -n https://src.fedoraproject.org/rpms/erlang-ranch.git /var/lib/mock/f41-build-1093663-19988/root/chroot_tmpdir/scmroot/erlang-ranch
Cloning into '/var/lib/mock/f41-build-1093663-19988/root/chroot_tmpdir/scmroot/erlang-ranch'...
$ git fetch origin 7a4008151321641e7cc956ad219221377fc80857:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-ranch
 * [new ref]         7a4008151321641e7cc956ad219221377fc80857 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7a40081 Ranch ver. 2.1.0-git-current