$ git clone -n https://src.fedoraproject.org/rpms/rust-rustc_version.git /var/lib/mock/f38-build-side-43-rust-devel-1414766-31450/root/chroot_tmpdir/scmroot/rust-rustc_version
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1414766-31450/root/chroot_tmpdir/scmroot/rust-rustc_version'...
$ git fetch origin 920149b4a52e42f627159c68707f22132aad30fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustc_version
 * [new ref]         920149b4a52e42f627159c68707f22132aad30fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 920149b Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild