$ git clone -n https://src.fedoraproject.org/rpms/rust-deflate64.git /var/lib/mock/f40-build-2571731-62241/root/chroot_tmpdir/scmroot/rust-deflate64
Cloning into '/var/lib/mock/f40-build-2571731-62241/root/chroot_tmpdir/scmroot/rust-deflate64'...
$ git fetch origin 83360ad3a7a0861500886245c6cc941ef50bb88e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-deflate64
 * [new ref]         83360ad3a7a0861500886245c6cc941ef50bb88e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 83360ad Update to version 0.1.7; Fixes RHBZ#2260604