$ git clone -n https://src.fedoraproject.org/rpms/rust-idna0.1.git /var/lib/mock/f41-build-side-1-3098656-39333/root/chroot_tmpdir/scmroot/rust-idna0.1
Cloning into '/var/lib/mock/f41-build-side-1-3098656-39333/root/chroot_tmpdir/scmroot/rust-idna0.1'...
$ git fetch origin f0a54bdc4f577222807b7955d73aa1757b8a35de:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-idna0.1
 * [new ref]         f0a54bdc4f577222807b7955d73aa1757b8a35de -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f0a54bd compat package no longer needed