$ git clone -n https://src.fedoraproject.org/rpms/rust-pin-project.git /var/lib/mock/f45-build-43851-807/root/chroot_tmpdir/scmroot/rust-pin-project
Cloning into '/var/lib/mock/f45-build-43851-807/root/chroot_tmpdir/scmroot/rust-pin-project'...
$ git fetch origin 8f8f4c902a914690523b2658d935757df7c53c3d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pin-project
 * [new ref]         8f8f4c902a914690523b2658d935757df7c53c3d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8f8f4c9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild