$ git clone -n https://src.fedoraproject.org/rpms/rust-struct-patch.git /var/lib/mock/f45-build-45221-821/root/chroot_tmpdir/scmroot/rust-struct-patch
Cloning into '/var/lib/mock/f45-build-45221-821/root/chroot_tmpdir/scmroot/rust-struct-patch'...
$ git fetch origin ebc3c71726cccdf44619212ddae49d0c1f58088e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-struct-patch
 * [new ref]         ebc3c71726cccdf44619212ddae49d0c1f58088e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ebc3c71 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild