$ git clone -n https://src.fedoraproject.org/rpms/rust-hkdf.git /var/lib/mock/f40-build-2082392-49836/root/chroot_tmpdir/scmroot/rust-hkdf
Cloning into '/var/lib/mock/f40-build-2082392-49836/root/chroot_tmpdir/scmroot/rust-hkdf'...
$ git fetch origin f73dd034e82a3dafb149ecc81df24353ddda8d0e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-hkdf
 * [new ref]         f73dd034e82a3dafb149ecc81df24353ddda8d0e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f73dd03 Regenerate with rust2rpm v24