$ git clone -n https://src.fedoraproject.org/rpms/ocaml-cryptokit.git /var/lib/mock/f39-build-1769068-41501/root/chroot_tmpdir/scmroot/ocaml-cryptokit
Cloning into '/var/lib/mock/f39-build-1769068-41501/root/chroot_tmpdir/scmroot/ocaml-cryptokit'...
$ git fetch origin 05112d5cf955bc85ebed15ccf778236523d7bcd0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-cryptokit
 * [new ref]         05112d5cf955bc85ebed15ccf778236523d7bcd0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 05112d5 Rebuild for ocaml-zarith 1.13