$ git clone -n https://src.fedoraproject.org/rpms/rust-struct-field-names-as-array-derive.git /var/lib/mock/f45-build-45217-821/root/chroot_tmpdir/scmroot/rust-struct-field-names-as-array-derive
Cloning into '/var/lib/mock/f45-build-45217-821/root/chroot_tmpdir/scmroot/rust-struct-field-names-as-array-derive'...
$ git fetch origin 767f30ab5a8d18f3a0b861f85341151aaad42a1c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-struct-field-names-as-array-derive
 * [new ref]         767f30ab5a8d18f3a0b861f85341151aaad42a1c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 767f30a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild