$ git clone -n https://src.fedoraproject.org/rpms/rust-weezl.git /var/lib/mock/f42-build-side-1-3586721-46924/root/chroot_tmpdir/scmroot/rust-weezl
Cloning into '/var/lib/mock/f42-build-side-1-3586721-46924/root/chroot_tmpdir/scmroot/rust-weezl'...
$ git fetch origin 1763fac0bc89c7249eea69373d78e9fb9a48dc1c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-weezl
 * [new ref]         1763fac0bc89c7249eea69373d78e9fb9a48dc1c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1763fac Update to version 0.1.10; Fixes RHBZ#2368083