$ git clone -n https://src.fedoraproject.org/rpms/rust-bit-set.git /var/lib/mock/f45-build-40442-772/root/chroot_tmpdir/scmroot/rust-bit-set
Cloning into '/var/lib/mock/f45-build-40442-772/root/chroot_tmpdir/scmroot/rust-bit-set'...
$ git fetch origin c9f3957d856712c2435b884a2306a4799786c8d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bit-set
 * [new ref]         c9f3957d856712c2435b884a2306a4799786c8d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c9f3957 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild