$ git clone -n https://src.fedoraproject.org/rpms/rust-icu_datetime_data.git /var/lib/mock/f45-build-42457-794/root/chroot_tmpdir/scmroot/rust-icu_datetime_data
Cloning into '/var/lib/mock/f45-build-42457-794/root/chroot_tmpdir/scmroot/rust-icu_datetime_data'...
$ git fetch origin 5fadac82dd225af529e18c8897df4b8d1d0d69f8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-icu_datetime_data
 * [new ref]         5fadac82dd225af529e18c8897df4b8d1d0d69f8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5fadac8 Update to version 2.3.0; Fixes RHBZ#2515883