$ git clone -n https://src.fedoraproject.org/rpms/rust-weezl.git /var/lib/mock/f40-build-781368-131566/root/chroot_tmpdir/scmroot/rust-weezl
Cloning into '/var/lib/mock/f40-build-781368-131566/root/chroot_tmpdir/scmroot/rust-weezl'...
$ git fetch origin da70ef87924e496affa5576cff4e471978d0667d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-weezl
 * [new ref]         da70ef87924e496affa5576cff4e471978d0667d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at da70ef8 Update to version 0.1.8; Fixes RHBZ#2259502