$ git clone -n https://src.fedoraproject.org/rpms/rust-proc-macro-error2.git /var/lib/mock/f45-build-44028-809/root/chroot_tmpdir/scmroot/rust-proc-macro-error2
Cloning into '/var/lib/mock/f45-build-44028-809/root/chroot_tmpdir/scmroot/rust-proc-macro-error2'...
$ git fetch origin 03c1349bd0aa43f375c4a676edbf2d3d9aac80f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-proc-macro-error2
 * [new ref]         03c1349bd0aa43f375c4a676edbf2d3d9aac80f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 03c1349 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild