$ git clone -n https://src.fedoraproject.org/rpms/rust-rustc-hash1.git /var/lib/mock/f45-build-44565-815/root/chroot_tmpdir/scmroot/rust-rustc-hash1
Cloning into '/var/lib/mock/f45-build-44565-815/root/chroot_tmpdir/scmroot/rust-rustc-hash1'...
$ git fetch origin 44af54c4b1cb1c2aeebf747906b9755bf28d3acd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustc-hash1
 * [new ref]         44af54c4b1cb1c2aeebf747906b9755bf28d3acd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 44af54c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild