$ git clone -n https://src.fedoraproject.org/rpms/phasex.git /var/lib/mock/f38-build-side-42-init-devel-686935-26759/root/chroot_tmpdir/scmroot/phasex
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-686935-26759/root/chroot_tmpdir/scmroot/phasex'...
$ git fetch origin 2e1b1a2bb5daccc817f0f72ad9a71b9df19a23db:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/phasex
 * [new ref]         2e1b1a2bb5daccc817f0f72ad9a71b9df19a23db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2e1b1a2 Fix FTBFS on i686