$ git clone -n https://src.fedoraproject.org/rpms/rust-pollster-macro.git /var/lib/mock/f45-build-43920-809/root/chroot_tmpdir/scmroot/rust-pollster-macro
Cloning into '/var/lib/mock/f45-build-43920-809/root/chroot_tmpdir/scmroot/rust-pollster-macro'...
$ git fetch origin d5d2e4b6ca137f7462690d028f8ffba39348ec60:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pollster-macro
 * [new ref]         d5d2e4b6ca137f7462690d028f8ffba39348ec60 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5d2e4b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild