Remove case consistency check at startup. (#7585)

- This was needed when we transitioned to all lowercase packages because
  git didn't handle case changes well on case-insensitive filesystems.

- Now it just adds extra stat calls to startup, and we check for
  all-lowercase package names in tests, so we'll remove it.

- people using really old versions of Spack can re-clone.

lib/spack/spack/hooks/case_consistency.py

@@ -1,110 +0,0 @@
-##############################################################################
-# Copyright (c) 2013-2017, Lawrence Livermore National Security, LLC.
-# Produced at the Lawrence Livermore National Laboratory.
-#
-# This file is part of Spack.
-# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
-# LLNL-CODE-647188
-#
-# For details, see https://github.com/spack/spack
-# Please also see the NOTICE and LICENSE files for our notice and the LGPL.
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU Lesser General Public License (as
-# published by the Free Software Foundation) version 2.1, February 1999.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
-# conditions of the GNU Lesser General Public License for more details.
-#
-# You should have received a copy of the GNU Lesser General Public
-# License along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-##############################################################################
-from __future__ import absolute_import
-
-import os
-import re
-import platform
-
-from llnl.util.filesystem import working_dir
-
-import spack
-from spack.cmd import spack_is_git_repo
-from spack.util.executable import which, ProcessError
-
-
-def pre_run():
-    if platform.system() != "Darwin":
-        return
-
-    try:
-        repo = spack.repo.get_repo('builtin')
-        git_case_consistency_check(repo.packages_path)
-    except spack.repository.UnknownNamespaceError:
-        pass
-
-
-def git_case_consistency_check(path):
-    """Re-sync case of files in a directory with git.
-
-    On case-insensitive but case-preserving filesystems like Mac OS X,
-    Git doesn't properly rename files that only had their case changed.
-
-    This checks files in a directory against git and does a
-    case-restoring rename (actually two renames, e.g.::
-
-        name -> tmp -> NAME
-
-    We use this in Spack to ensure package directories are named
-    correctly.
-
-    TODO: this check can probably be removed once package names have been
-    TODO: lowercase for a long while.
-
-    """
-    # Don't bother fixing case if Spack isn't in a git repository
-    if not spack_is_git_repo():
-        return
-
-    git = which('git', required=False)
-    if not git:
-        return
-
-    with working_dir(path):
-        try:
-            git_filenames = git('ls-tree', '--name-only', 'HEAD', output=str)
-            git_filenames = set(re.split(r'\s+', git_filenames.strip()))
-        except ProcessError:
-            return  # Ignore errors calling git
-
-        lower_to_mixed = {}
-        for fn in git_filenames:
-            lower = fn.lower()
-            mixed = lower_to_mixed.setdefault(lower, [])
-            mixed.append(fn)
-
-        # Iterate through all actual files and make sure their names are
-        # the same as corresponding names in git
-        actual_filenames = os.listdir('.')
-        for actual in actual_filenames:
-            lower = actual.lower()
-
-            # not tracked by git
-            if lower not in lower_to_mixed:
-                continue
-
-            # Don't know what to do with multiple matches
-            if len(lower_to_mixed[lower]) != 1:
-                continue
-
-            # Skip if case is already correct
-            git_name = lower_to_mixed[lower][0]
-            if git_name == actual:
-                continue
-
-            # restore case with two renames
-            tmp_name = actual + '.spack.tmp'
-            os.rename(actual, tmp_name)
-            os.rename(tmp_name, git_name)