$ git clone -n https://src.fedoraproject.org/rpms/ghc-magic.git /var/lib/mock/f38-build-side-42-init-devel-567660-25904/root/chroot_tmpdir/scmroot/ghc-magic
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-567660-25904/root/chroot_tmpdir/scmroot/ghc-magic'...
$ git fetch origin 5cb51c51c4c1a0a2dda270a49d9700d71748f9a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-magic
 * [new ref]         5cb51c51c4c1a0a2dda270a49d9700d71748f9a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5cb51c5 Convert to %autorelease and %autochangelog