$ git clone -n https://src.fedoraproject.org/rpms/rust-orion.git /var/lib/mock/f41-build-side-1-2759483-31622/root/chroot_tmpdir/scmroot/rust-orion
Cloning into '/var/lib/mock/f41-build-side-1-2759483-31622/root/chroot_tmpdir/scmroot/rust-orion'...
$ git fetch origin 20b328dcec54640dddbc25033b45e01fe79a41f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-orion
 * [new ref]         20b328dcec54640dddbc25033b45e01fe79a41f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20b328d Update to version 0.17.7; Fixes RHBZ#2311159