$ git clone -n https://src.fedoraproject.org/rpms/rust-diesel_derives.git /var/lib/mock/f39-build-1446005-32654/root/chroot_tmpdir/scmroot/rust-diesel_derives
Cloning into '/var/lib/mock/f39-build-1446005-32654/root/chroot_tmpdir/scmroot/rust-diesel_derives'...
$ git fetch origin 2e533be99d6097fc8a8914a76401671308c9d6cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-diesel_derives
 * [new ref]         2e533be99d6097fc8a8914a76401671308c9d6cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2e533be Update to version 2.1.2; Fixes RHBZ#2240657