$ git clone -n https://src.fedoraproject.org/rpms/rust-icu_provider.git /var/lib/mock/f42-build-side-1-3582483-46885/root/chroot_tmpdir/scmroot/rust-icu_provider
Cloning into '/var/lib/mock/f42-build-side-1-3582483-46885/root/chroot_tmpdir/scmroot/rust-icu_provider'...
$ git fetch origin 1966d742bac98a52419fa01c4ff88df8f548fb0f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-icu_provider
 * [new ref]         1966d742bac98a52419fa01c4ff88df8f548fb0f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1966d74 Stop hiding the deserialize_postcard_1 feature