$ git clone -n https://src.fedoraproject.org/rpms/rust-cfg-if0.1.git /var/lib/mock/f45-build-40739-775/root/chroot_tmpdir/scmroot/rust-cfg-if0.1
Cloning into '/var/lib/mock/f45-build-40739-775/root/chroot_tmpdir/scmroot/rust-cfg-if0.1'...
$ git fetch origin 5b6a558d5cabd64fa61008146eade2d474f4df52:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cfg-if0.1
 * [new ref]         5b6a558d5cabd64fa61008146eade2d474f4df52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b6a558 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild