$ git clone -n https://src.fedoraproject.org/rpms/rust-bit-set.git /var/lib/mock/f40-build-2224308-52778/root/chroot_tmpdir/scmroot/rust-bit-set
Cloning into '/var/lib/mock/f40-build-2224308-52778/root/chroot_tmpdir/scmroot/rust-bit-set'...
$ git fetch origin 1870b95129b811861bc0d39c5a3f1eb4cbf16e70:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bit-set
 * [new ref]         1870b95129b811861bc0d39c5a3f1eb4cbf16e70 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1870b95 Regenerate with rust2rpm v25