$ git clone -n https://src.fedoraproject.org/rpms/rust-env_proxy.git /var/lib/mock/f45-build-41598-784/root/chroot_tmpdir/scmroot/rust-env_proxy
Cloning into '/var/lib/mock/f45-build-41598-784/root/chroot_tmpdir/scmroot/rust-env_proxy'...
$ git fetch origin 65ad64bca1314b1238278cb5b8aa4c3c5cd1bdde:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-env_proxy
 * [new ref]         65ad64bca1314b1238278cb5b8aa4c3c5cd1bdde -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 65ad64b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild