$ git clone -n https://src.fedoraproject.org/rpms/rust-const-random.git /var/lib/mock/f38-build-side-43-rust-devel-1411014-31424/root/chroot_tmpdir/scmroot/rust-const-random
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1411014-31424/root/chroot_tmpdir/scmroot/rust-const-random'...
$ git fetch origin 589d0cb3454a0ddc59c607bebec942f71efe2621:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-const-random
 * [new ref]         589d0cb3454a0ddc59c607bebec942f71efe2621 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 589d0cb Update to version 0.1.15; Fixes RHBZ#2137489