$ git clone -n https://src.fedoraproject.org/rpms/rust-unic-char-range.git /var/lib/mock/f45-build-45859-828/root/chroot_tmpdir/scmroot/rust-unic-char-range
Cloning into '/var/lib/mock/f45-build-45859-828/root/chroot_tmpdir/scmroot/rust-unic-char-range'...
$ git fetch origin be644a1e254ebee05102a8a22dda0a722417a62f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-unic-char-range
 * [new ref]         be644a1e254ebee05102a8a22dda0a722417a62f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at be644a1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild