$ git clone -n https://src.fedoraproject.org/rpms/rust-bit-vec0.6.git /var/lib/mock/f45-build-40477-772/root/chroot_tmpdir/scmroot/rust-bit-vec0.6
Cloning into '/var/lib/mock/f45-build-40477-772/root/chroot_tmpdir/scmroot/rust-bit-vec0.6'...
$ git fetch origin 2d7fcbbd0cc90281427416314f5d19773b8b1a82:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bit-vec0.6
 * [new ref]         2d7fcbbd0cc90281427416314f5d19773b8b1a82 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2d7fcbb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild