$ git clone -n https://src.fedoraproject.org/rpms/rust-toml_datetime.git /var/lib/mock/f39-build-1506662-35204/root/chroot_tmpdir/scmroot/rust-toml_datetime
Cloning into '/var/lib/mock/f39-build-1506662-35204/root/chroot_tmpdir/scmroot/rust-toml_datetime'...
$ git fetch origin 8feb4b80e02d84f27ea09235cc0d02f3d6b1f65b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-toml_datetime
 * [new ref]         8feb4b80e02d84f27ea09235cc0d02f3d6b1f65b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8feb4b8 Update to version 0.6.5; Fixes RHBZ#2245687