$ git clone -n https://src.fedoraproject.org/rpms/weechat.git /var/lib/mock/f42-build-3299242-41426/root/chroot_tmpdir/scmroot/weechat
Cloning into '/var/lib/mock/f42-build-3299242-41426/root/chroot_tmpdir/scmroot/weechat'...
$ git fetch origin 9d9eaacd1b0559ce72b5cf648d501eba3f185be7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/weechat
 * [new ref]         9d9eaacd1b0559ce72b5cf648d501eba3f185be7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9d9eaac Update to 4.5.2