$ git clone -n https://src.fedoraproject.org/rpms/rust-cookie_store.git /var/lib/mock/f39-build-2261136-54414/root/chroot_tmpdir/scmroot/rust-cookie_store
Cloning into '/var/lib/mock/f39-build-2261136-54414/root/chroot_tmpdir/scmroot/rust-cookie_store'...
$ git fetch origin bb41db4d431a34a5f46a691888c705ea6cab76d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cookie_store
 * [new ref]         bb41db4d431a34a5f46a691888c705ea6cab76d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bb41db4 Update to version 0.20.0; Fixes RHBZ#2122457