$ git clone -n https://src.fedoraproject.org/rpms/weechat.git /var/lib/mock/f39-build-2339959-59665/root/chroot_tmpdir/scmroot/weechat
Cloning into '/var/lib/mock/f39-build-2339959-59665/root/chroot_tmpdir/scmroot/weechat'...
$ git fetch origin d497d5657373e92339f202c2c3e69bf266ab5cbe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/weechat
 * [new ref]         d497d5657373e92339f202c2c3e69bf266ab5cbe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d497d56 Update to 4.2.1