$ git clone -n https://src.fedoraproject.org/rpms/rust-rustflags.git /var/lib/mock/f45-build-44554-815/root/chroot_tmpdir/scmroot/rust-rustflags
Cloning into '/var/lib/mock/f45-build-44554-815/root/chroot_tmpdir/scmroot/rust-rustflags'...
$ git fetch origin 31dd1717916e5dc64315d3269da241d680ed7c67:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustflags
 * [new ref]         31dd1717916e5dc64315d3269da241d680ed7c67 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31dd171 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild