$ git clone -n https://src.fedoraproject.org/rpms/rust-bit-vec.git /var/lib/mock/f45-build-40436-772/root/chroot_tmpdir/scmroot/rust-bit-vec
Cloning into '/var/lib/mock/f45-build-40436-772/root/chroot_tmpdir/scmroot/rust-bit-vec'...
$ git fetch origin 2dceb921c2c8c4899e616d0c4f1859cb9a7c3b5f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bit-vec
 * [new ref]         2dceb921c2c8c4899e616d0c4f1859cb9a7c3b5f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2dceb92 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild