$ git clone -n https://src.fedoraproject.org/rpms/webkitgtk.git /var/lib/mock/f42-build-3347412-45004/root/chroot_tmpdir/scmroot/webkitgtk
Cloning into '/var/lib/mock/f42-build-3347412-45004/root/chroot_tmpdir/scmroot/webkitgtk'...
$ git fetch origin ad45dc979525a3a69314ff1c8a97b47ccbae848d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/webkitgtk
 * [new ref]         ad45dc979525a3a69314ff1c8a97b47ccbae848d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad45dc9 Update to 2.47.90