$ git clone -n https://src.fedoraproject.org/rpms/rust-unicode-bom.git /var/lib/mock/f40-build-2040491-48360/root/chroot_tmpdir/scmroot/rust-unicode-bom
Cloning into '/var/lib/mock/f40-build-2040491-48360/root/chroot_tmpdir/scmroot/rust-unicode-bom'...
$ git fetch origin b43e7e01999fda610e552bba724db67ff160a2c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-unicode-bom
 * [new ref]         b43e7e01999fda610e552bba724db67ff160a2c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b43e7e0 Update to version 2.0.3 (rhbz#2249544)