$ git clone -n https://src.fedoraproject.org/rpms/objfw.git /var/lib/mock/f40-build-800555-143605/root/chroot_tmpdir/scmroot/objfw
Cloning into '/var/lib/mock/f40-build-800555-143605/root/chroot_tmpdir/scmroot/objfw'...
$ git fetch origin e1fe862f10952d1efe253e76b304a04a23302f54:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/objfw
 * [new ref]         e1fe862f10952d1efe253e76b304a04a23302f54 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e1fe862 Update to 1.0.12