$ git clone -n https://src.fedoraproject.org/rpms/rust-libcst_derive.git /var/lib/mock/f45-build-42877-797/root/chroot_tmpdir/scmroot/rust-libcst_derive
Cloning into '/var/lib/mock/f45-build-42877-797/root/chroot_tmpdir/scmroot/rust-libcst_derive'...
$ git fetch origin 1a2f1b2e555233179ac425f08dd96c4a3e989457:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-libcst_derive
 * [new ref]         1a2f1b2e555233179ac425f08dd96c4a3e989457 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a2f1b2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild