$ git clone -n https://src.fedoraproject.org/rpms/magic.git /var/lib/mock/f38-build-728038-100999/root/chroot_tmpdir/scmroot/magic
Cloning into '/var/lib/mock/f38-build-728038-100999/root/chroot_tmpdir/scmroot/magic'...
$ git fetch origin 4c467912c90c1fc885dd6aab0d79c4c14e5258fc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/magic
 * [new ref]         4c467912c90c1fc885dd6aab0d79c4c14e5258fc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4c46791 8.3.402