$ git clone -n https://src.fedoraproject.org/rpms/rust-const-random.git /var/lib/mock/f40-build-2260033-54393/root/chroot_tmpdir/scmroot/rust-const-random
Cloning into '/var/lib/mock/f40-build-2260033-54393/root/chroot_tmpdir/scmroot/rust-const-random'...
$ git fetch origin 70a26a1c5a1e328a2243c9dc220c408154fbbee9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-const-random
 * [new ref]         70a26a1c5a1e328a2243c9dc220c408154fbbee9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 70a26a1 Update to version 0.1.17; Fixes RHBZ#2245737