$ git clone -n https://src.fedoraproject.org/rpms/rust-fern.git /var/lib/mock/f38-build-side-43-rust-devel-1411749-31436/root/chroot_tmpdir/scmroot/rust-fern
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1411749-31436/root/chroot_tmpdir/scmroot/rust-fern'...
$ git fetch origin 5cfcb8cb3fbb2223f2098f4d39b54fd2f8b7648b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fern
 * [new ref]         5cfcb8cb3fbb2223f2098f4d39b54fd2f8b7648b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5cfcb8c Update to version 0.6.2; Fixes RHBZ#2181224