$ git clone -n https://src.fedoraproject.org/rpms/rust-nix0.28.git /var/lib/mock/f45-build-43362-802/root/chroot_tmpdir/scmroot/rust-nix0.28
Cloning into '/var/lib/mock/f45-build-43362-802/root/chroot_tmpdir/scmroot/rust-nix0.28'...
$ git fetch origin 411dd782b9a394e13f74e815f4abf0272c277c4c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nix0.28
 * [new ref]         411dd782b9a394e13f74e815f4abf0272c277c4c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 411dd78 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild