$ git clone -n https://src.fedoraproject.org/rpms/rust-icu_locid.git /var/lib/mock/f42-build-side-1-3588915-46951/root/chroot_tmpdir/scmroot/rust-icu_locid
Cloning into '/var/lib/mock/f42-build-side-1-3588915-46951/root/chroot_tmpdir/scmroot/rust-icu_locid'...
$ git fetch origin f9ffddd50f4c05a0a674c2e71df6dd28e235cf4a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-icu_locid
 * [new ref]         f9ffddd50f4c05a0a674c2e71df6dd28e235cf4a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f9ffddd Finish restoring postcard dev-dependency