$ git clone -n https://src.fedoraproject.org/rpms/rust-language-tags.git /var/lib/mock/f45-build-42823-796/root/chroot_tmpdir/scmroot/rust-language-tags
Cloning into '/var/lib/mock/f45-build-42823-796/root/chroot_tmpdir/scmroot/rust-language-tags'...
$ git fetch origin 7baebe51ef5d6a38a29c7de65c9a1d45175afe8c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-language-tags
 * [new ref]         7baebe51ef5d6a38a29c7de65c9a1d45175afe8c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7baebe5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild