$ git clone -n https://src.fedoraproject.org/rpms/harfbuzz.git /var/lib/mock/f42-build-861945-170521/root/chroot_tmpdir/scmroot/harfbuzz
Cloning into '/var/lib/mock/f42-build-861945-170521/root/chroot_tmpdir/scmroot/harfbuzz'...
$ git fetch origin 6d9f4761999c88415a70d3ca0a4c8829c33c4e9b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/harfbuzz
 * [new ref]         6d9f4761999c88415a70d3ca0a4c8829c33c4e9b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d9f476 Rebuild for ICU 76