$ git clone -n https://src.fedoraproject.org/rpms/webkitgtk.git /var/lib/mock/f41-build-side-1-3136322-39772/root/chroot_tmpdir/scmroot/webkitgtk
Cloning into '/var/lib/mock/f41-build-side-1-3136322-39772/root/chroot_tmpdir/scmroot/webkitgtk'...
$ git fetch origin 4a989df4aecc81bb19247d277d035c36cae123c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/webkitgtk
 * [new ref]         4a989df4aecc81bb19247d277d035c36cae123c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4a989df Update gitignore