$ git clone -n https://src.fedoraproject.org/rpms/rubygem-jekyll.git /var/lib/mock/f38-build-side-42-init-devel-662546-26636/root/chroot_tmpdir/scmroot/rubygem-jekyll
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-662546-26636/root/chroot_tmpdir/scmroot/rubygem-jekyll'...
$ git fetch origin e2402c15d1187c245672a06bde3adb4ec6265ae6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-jekyll
 * [new ref]         e2402c15d1187c245672a06bde3adb4ec6265ae6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e2402c1 Update to 4.3.2 (rhbz#2162783)