use os.path.join instead of join_path in core

- Spack core has long used llnl.util.filesystem.join_path, but
  os.path.join is pretty much the same thing, and is more efficient.

- Use os.path.join in the core Spack code from now on.

34 files changed, 141 insertions, 156 deletions

diff --git a/lib/spack/spack/architecture.py b/lib/spack/spack/architecture.py
index a3407b95d1..f7b1946c46 100644
--- a/lib/spack/spack/architecture.py
+++ b/lib/spack/spack/architecture.py
@@ -80,7 +80,6 @@ import inspect
 import platform as py_platform
 
 from llnl.util.lang import memoized, list_modules, key_ordering
-from llnl.util.filesystem import join_path
 import llnl.util.tty as tty
 
 import spack.paths
@@ -271,7 +270,7 @@ class OperatingSystem(object):
             filtered_path.append(p)
 
             # Check for a bin directory, add it if it exists
-            bin = join_path(p, 'bin')
+            bin = os.path.join(p, 'bin')
             if os.path.isdir(bin):
                 filtered_path.append(os.path.realpath(bin))
 
diff --git a/lib/spack/spack/binary_distribution.py b/lib/spack/spack/binary_distribution.py
index 5c4e913692..5ca6fe54e6 100644
--- a/lib/spack/spack/binary_distribution.py
+++ b/lib/spack/spack/binary_distribution.py
@@ -35,7 +35,7 @@ from contextlib import closing
 import yaml
 
 import llnl.util.tty as tty
-from llnl.util.filesystem import mkdirp, join_path, install_tree
+from llnl.util.filesystem import mkdirp, install_tree
 
 import spack
 import spack.cmd
@@ -264,9 +264,9 @@ def build_tarball(spec, outdir, force=False, rel=False, unsigned=False,
     """
     # set up some paths
     tarfile_name = tarball_name(spec, '.tar.gz')
-    tarfile_dir = join_path(outdir, "build_cache",
-                            tarball_directory_name(spec))
-    tarfile_path = join_path(tarfile_dir, tarfile_name)
+    tarfile_dir = os.path.join(outdir, "build_cache",
+                               tarball_directory_name(spec))
+    tarfile_path = os.path.join(tarfile_dir, tarfile_name)
     mkdirp(tarfile_dir)
     spackfile_path = os.path.join(
         outdir, "build_cache", tarball_path_name(spec, '.spack'))
@@ -278,18 +278,18 @@ def build_tarball(spec, outdir, force=False, rel=False, unsigned=False,
     # need to copy the spec file so the build cache can be downloaded
     # without concretizing with the current spack packages
     # and preferences
-    spec_file = join_path(spec.prefix, ".spack", "spec.yaml")
+    spec_file = os.path.join(spec.prefix, ".spack", "spec.yaml")
     specfile_name = tarball_name(spec, '.spec.yaml')
     specfile_path = os.path.realpath(
-        join_path(outdir, "build_cache", specfile_name))
-    indexfile_path = join_path(outdir, "build_cache", "index.html")
+        os.path.join(outdir, "build_cache", specfile_name))
+    indexfile_path = os.path.join(outdir, "build_cache", "index.html")
     if os.path.exists(specfile_path):
         if force:
             os.remove(specfile_path)
         else:
             raise NoOverwriteException(str(specfile_path))
     # make a copy of the install directory to work with
-    workdir = join_path(tempfile.mkdtemp(), os.path.basename(spec.prefix))
+    workdir = os.path.join(tempfile.mkdtemp(), os.path.basename(spec.prefix))
     install_tree(spec.prefix, workdir, symlinks=True)
 
     # create info for later relocation and create tar
@@ -512,7 +512,7 @@ def extract_tarball(spec, filename, allow_root=False, unsigned=False,
     # the base of the install prefix is used when creating the tarball
     # so the pathname should be the same now that the directory layout
     # is confirmed
-    workdir = join_path(tmpdir, os.path.basename(spec.prefix))
+    workdir = os.path.join(tmpdir, os.path.basename(spec.prefix))
 
     # cleanup
     os.remove(tarfile_path)
diff --git a/lib/spack/spack/build_systems/autotools.py b/lib/spack/spack/build_systems/autotools.py
index 0c9760faa5..21fe7c4c5b 100644
--- a/lib/spack/spack/build_systems/autotools.py
+++ b/lib/spack/spack/build_systems/autotools.py
@@ -32,7 +32,7 @@ from subprocess import PIPE
 from subprocess import check_call
 
 import llnl.util.tty as tty
-from llnl.util.filesystem import working_dir, join_path, force_remove
+from llnl.util.filesystem import working_dir, force_remove
 from spack.package import PackageBase, run_after, run_before
 from spack.util.executable import Executable
 
@@ -177,7 +177,7 @@ class AutotoolsPackage(PackageBase):
     @property
     def configure_abs_path(self):
         # Absolute path to configure
-        configure_abs_path = join_path(
+        configure_abs_path = os.path.join(
             os.path.abspath(self.configure_directory), 'configure'
         )
         return configure_abs_path
@@ -220,7 +220,7 @@ class AutotoolsPackage(PackageBase):
             if 'pkgconfig' in spec:
                 autoreconf_args += [
                     '-I',
-                    join_path(spec['pkgconfig'].prefix, 'share', 'aclocal'),
+                    os.path.join(spec['pkgconfig'].prefix, 'share', 'aclocal'),
                 ]
             autoreconf_args += self.autoreconf_extra_args
             m.autoreconf(*autoreconf_args)
diff --git a/lib/spack/spack/build_systems/cmake.py b/lib/spack/spack/build_systems/cmake.py
index 27b3e56a81..c60f649fa5 100644
--- a/lib/spack/spack/build_systems/cmake.py
+++ b/lib/spack/spack/build_systems/cmake.py
@@ -28,7 +28,7 @@ import os
 import platform
 
 import spack.build_environment
-from llnl.util.filesystem import working_dir, join_path
+from llnl.util.filesystem import working_dir
 from spack.util.environment import filter_system_paths
 from spack.directives import depends_on, variant
 from spack.package import PackageBase, InstallError, run_after
@@ -208,7 +208,7 @@ class CMakePackage(PackageBase):
 
         :return: directory where to build the package
         """
-        return join_path(self.stage.source_path, 'spack-build')
+        return os.path.join(self.stage.source_path, 'spack-build')
 
     def cmake_args(self):
         """Produces a list containing all the arguments that must be passed to
diff --git a/lib/spack/spack/build_systems/intel.py b/lib/spack/spack/build_systems/intel.py
index 0218be59bc..3a67da7e09 100644
--- a/lib/spack/spack/build_systems/intel.py
+++ b/lib/spack/spack/build_systems/intel.py
@@ -26,7 +26,7 @@
 import os
 import xml.etree.ElementTree as ET
 
-from llnl.util.filesystem import install, join_path
+from llnl.util.filesystem import install
 from spack.package import PackageBase, run_after
 from spack.util.executable import Executable
 
@@ -109,8 +109,8 @@ class IntelPackage(PackageBase):
 
         All Intel software shares the same license, so we store it in a
         common 'intel' directory."""
-        return join_path(self.global_license_dir, 'intel',
-                         os.path.basename(self.license_files[0]))
+        return os.path.join(self.global_license_dir, 'intel',
+                            os.path.basename(self.license_files[0]))
 
     def configure(self, spec, prefix):
         """Writes the ``silent.cfg`` file used to configure the installation.
@@ -186,7 +186,7 @@ class IntelPackage(PackageBase):
     @run_after('install')
     def save_silent_cfg(self):
         """Copies the silent.cfg configuration file to ``<prefix>/.spack``."""
-        install('silent.cfg', join_path(self.prefix, '.spack'))
+        install('silent.cfg', os.path.join(self.prefix, '.spack'))
 
     # Check that self.prefix is there after installation
     run_after('install')(PackageBase.sanity_check_prefix)
diff --git a/lib/spack/spack/build_systems/perl.py b/lib/spack/spack/build_systems/perl.py
index 9e2bf0fddb..eb6d2f05a4 100644
--- a/lib/spack/spack/build_systems/perl.py
+++ b/lib/spack/spack/build_systems/perl.py
@@ -26,7 +26,6 @@
 import inspect
 import os
 
-from llnl.util.filesystem import join_path
 from spack.directives import depends_on, extends
 from spack.package import PackageBase, run_after
 from spack.util.executable import Executable
@@ -88,7 +87,7 @@ class PerlPackage(PackageBase):
         elif os.path.isfile('Build.PL'):
             self.build_method = 'Build.PL'
             self.build_executable = Executable(
-                join_path(self.stage.source_path, 'Build'))
+                os.path.join(self.stage.source_path, 'Build'))
         else:
             raise RuntimeError('Unknown build_method for perl package')
 
diff --git a/lib/spack/spack/cmd/install.py b/lib/spack/spack/cmd/install.py
index 93aeb1009a..6404ca81a3 100644
--- a/lib/spack/spack/cmd/install.py
+++ b/lib/spack/spack/cmd/install.py
@@ -135,9 +135,9 @@ def default_log_file(spec):
     """
     fmt = 'test-{x.name}-{x.version}-{hash}.xml'
     basename = fmt.format(x=spec, hash=spec.dag_hash())
-    dirname = fs.join_path(spack.paths.var_path, 'junit-report')
+    dirname = fs.os.path.join(spack.paths.var_path, 'junit-report')
     fs.mkdirp(dirname)
-    return fs.join_path(dirname, basename)
+    return fs.os.path.join(dirname, basename)
 
 
 def install_spec(cli_args, kwargs, spec):
diff --git a/lib/spack/spack/compiler.py b/lib/spack/spack/compiler.py
index f6f5a4d4dc..6d9742150e 100644
--- a/lib/spack/spack/compiler.py
+++ b/lib/spack/spack/compiler.py
@@ -27,7 +27,6 @@ import re
 import itertools
 
 import llnl.util.tty as tty
-from llnl.util.filesystem import join_path
 
 import spack.error
 import spack.spec
@@ -270,7 +269,7 @@ class Compiler(object):
 
             files = os.listdir(directory)
             for exe in files:
-                full_path = join_path(directory, exe)
+                full_path = os.path.join(directory, exe)
 
                 prod = itertools.product(prefixes, compiler_names, suffixes)
                 for pre, name, suf in prod:
diff --git a/lib/spack/spack/database.py b/lib/spack/spack/database.py
index 3a5f4b73cb..3c62cc588f 100644
--- a/lib/spack/spack/database.py
+++ b/lib/spack/spack/database.py
@@ -51,7 +51,7 @@ from six import iteritems
 from yaml.error import MarkedYAMLError, YAMLError
 
 import llnl.util.tty as tty
-from llnl.util.filesystem import join_path, mkdirp
+from llnl.util.filesystem import mkdirp
 from llnl.util.lock import Lock, WriteTransaction, ReadTransaction
 
 import spack.store
@@ -184,18 +184,18 @@ class Database(object):
 
         if db_dir is None:
             # If the db_dir is not provided, default to within the db root.
-            self._db_dir = join_path(self.root, _db_dirname)
+            self._db_dir = os.path.join(self.root, _db_dirname)
         else:
             # Allow customizing the database directory location for testing.
             self._db_dir = db_dir
 
         # Set up layout of database files within the db dir
-        self._old_yaml_index_path = join_path(self._db_dir, 'index.yaml')
-        self._index_path = join_path(self._db_dir, 'index.json')
-        self._lock_path = join_path(self._db_dir, 'lock')
+        self._old_yaml_index_path = os.path.join(self._db_dir, 'index.yaml')
+        self._index_path = os.path.join(self._db_dir, 'index.json')
+        self._lock_path = os.path.join(self._db_dir, 'lock')
 
         # This is for other classes to use to lock prefix directories.
-        self.prefix_lock_path = join_path(self._db_dir, 'prefix_lock')
+        self.prefix_lock_path = os.path.join(self._db_dir, 'prefix_lock')
 
         # Create needed directories and files
         if not os.path.exists(self._db_dir):
diff --git a/lib/spack/spack/directives.py b/lib/spack/spack/directives.py
index eca984093d..2c270e7448 100644
--- a/lib/spack/spack/directives.py
+++ b/lib/spack/spack/directives.py
@@ -54,7 +54,6 @@ import re
 from six import string_types
 
 import llnl.util.lang
-from llnl.util.filesystem import join_path
 
 import spack
 import spack.error
@@ -530,7 +529,7 @@ def resource(**kwargs):
         # Check if the path falls within the main package stage area
         test_path = 'stage_folder_root'
         normalized_destination = os.path.normpath(
-            join_path(test_path, destination)
+            os.path.join(test_path, destination)
         )  # Normalized absolute path
 
         if test_path not in normalized_destination:
diff --git a/lib/spack/spack/directory_layout.py b/lib/spack/spack/directory_layout.py
index 6c38b9f077..b392af01eb 100644
--- a/lib/spack/spack/directory_layout.py
+++ b/lib/spack/spack/directory_layout.py
@@ -29,7 +29,7 @@ import tempfile
 import yaml
 import re
 
-from llnl.util.filesystem import join_path, mkdirp
+from llnl.util.filesystem import mkdirp
 
 import spack.config
 import spack.spec
@@ -239,22 +239,22 @@ class YamlDirectoryLayout(DirectoryLayout):
     def spec_file_path(self, spec):
         """Gets full path to spec file"""
         _check_concrete(spec)
-        return join_path(self.metadata_path(spec), self.spec_file_name)
+        return os.path.join(self.metadata_path(spec), self.spec_file_name)
 
     def metadata_path(self, spec):
-        return join_path(self.path_for_spec(spec), self.metadata_dir)
+        return os.path.join(self.path_for_spec(spec), self.metadata_dir)
 
     def build_log_path(self, spec):
-        return join_path(self.path_for_spec(spec), self.metadata_dir,
-                         self.build_log_name)
+        return os.path.join(self.path_for_spec(spec), self.metadata_dir,
+                            self.build_log_name)
 
     def build_env_path(self, spec):
-        return join_path(self.path_for_spec(spec), self.metadata_dir,
-                         self.build_env_name)
+        return os.path.join(self.path_for_spec(spec), self.metadata_dir,
+                            self.build_env_name)
 
     def build_packages_path(self, spec):
-        return join_path(self.path_for_spec(spec), self.metadata_dir,
-                         self.packages_dir)
+        return os.path.join(self.path_for_spec(spec), self.metadata_dir,
+                            self.packages_dir)
 
     def create_install_directory(self, spec):
         _check_concrete(spec)
@@ -302,7 +302,7 @@ class YamlDirectoryLayout(DirectoryLayout):
 
         path_elems = ["*"] * len(self.path_scheme.split(os.sep))
         path_elems += [self.metadata_dir, self.spec_file_name]
-        pattern = join_path(self.root, *path_elems)
+        pattern = os.path.join(self.root, *path_elems)
         spec_files = glob.glob(pattern)
         return [self.read_spec(s) for s in spec_files]
 
@@ -356,8 +356,8 @@ class YamlExtensionsLayout(ExtensionsLayout):
     def extension_file_path(self, spec):
         """Gets full path to an installed package's extension file"""
         _check_concrete(spec)
-        return join_path(self.layout.metadata_path(spec),
-                         self.extension_file_name)
+        return os.path.join(self.layout.metadata_path(spec),
+                            self.extension_file_name)
 
     def extension_map(self, spec):
         """Defensive copying version of _extension_map() for external API."""
@@ -446,8 +446,8 @@ class YamlViewExtensionsLayout(YamlExtensionsLayout):
     def extension_file_path(self, spec):
         """Gets the full path to an installed package's extension file."""
         _check_concrete(spec)
-        return join_path(self.root, self.layout.metadata_dir, spec.name,
-                         self.extension_file_name)
+        return os.path.join(self.root, self.layout.metadata_dir, spec.name,
+                            self.extension_file_name)
 
     def extendee_target_directory(self, extendee):
         return self.root
diff --git a/lib/spack/spack/fetch_strategy.py b/lib/spack/spack/fetch_strategy.py
index 7931dd65d2..423cccbb0b 100644
--- a/lib/spack/spack/fetch_strategy.py
+++ b/lib/spack/spack/fetch_strategy.py
@@ -49,7 +49,7 @@ from functools import wraps
 from six import string_types, with_metaclass
 
 import llnl.util.tty as tty
-from llnl.util.filesystem import working_dir, mkdirp, join_path
+from llnl.util.filesystem import working_dir, mkdirp
 
 import spack.config
 import spack.error
@@ -1035,12 +1035,12 @@ class FsCache(object):
         if isinstance(fetcher, CacheURLFetchStrategy):
             return
 
-        dst = join_path(self.root, relativeDst)
+        dst = os.path.join(self.root, relativeDst)
         mkdirp(os.path.dirname(dst))
         fetcher.archive(dst)
 
     def fetcher(self, targetPath, digest, **kwargs):
-        path = join_path(self.root, targetPath)
+        path = os.path.join(self.root, targetPath)
         return CacheURLFetchStrategy(path, digest, **kwargs)
 
     def destroy(self):
diff --git a/lib/spack/spack/filesystem_view.py b/lib/spack/spack/filesystem_view.py
index 51a673d486..c7646d1120 100644
--- a/lib/spack/spack/filesystem_view.py
+++ b/lib/spack/spack/filesystem_view.py
@@ -28,7 +28,6 @@ import re
 import shutil
 import sys
 
-from llnl.util.filesystem import join_path
 from llnl.util.link_tree import LinkTree
 from llnl.util import tty
 
@@ -390,8 +389,8 @@ class YamlFilesystemView(FilesystemView):
             tty.info(self._croot + 'Removed package: %s' % colorize_spec(spec))
 
     def get_all_specs(self):
-        dotspack = join_path(self.root,
-                             spack.store.layout.metadata_dir)
+        dotspack = os.path.join(self.root,
+                                spack.store.layout.metadata_dir)
         if os.path.exists(dotspack):
             return list(filter(None, map(self.get_spec, os.listdir(dotspack))))
         else:
@@ -408,14 +407,14 @@ class YamlFilesystemView(FilesystemView):
 
     def get_path_meta_folder(self, spec):
         "Get path to meta folder for either spec or spec name."
-        return join_path(self.root,
-                         spack.store.layout.metadata_dir,
-                         getattr(spec, "name", spec))
+        return os.path.join(self.root,
+                            spack.store.layout.metadata_dir,
+                            getattr(spec, "name", spec))
 
     def get_spec(self, spec):
         dotspack = self.get_path_meta_folder(spec)
-        filename = join_path(dotspack,
-                             spack.store.layout.spec_file_name)
+        filename = os.path.join(dotspack,
+                                spack.store.layout.spec_file_name)
 
         try:
             with open(filename, "r") as f:
diff --git a/lib/spack/spack/hooks/__init__.py b/lib/spack/spack/hooks/__init__.py
index 66386c6d22..8a4b8ada76 100644
--- a/lib/spack/spack/hooks/__init__.py
+++ b/lib/spack/spack/hooks/__init__.py
@@ -42,9 +42,9 @@
    features.
 """
 import imp
+import os.path
 
 import spack.paths
-from llnl.util.filesystem import join_path
 from llnl.util.lang import memoized, list_modules
 
 
@@ -53,7 +53,7 @@ def all_hook_modules():
     modules = []
     for name in list_modules(spack.paths.hooks_path):
         mod_name = __name__ + '.' + name
-        path = join_path(spack.paths.hooks_path, name) + ".py"
+        path = os.path.join(spack.paths.hooks_path, name) + ".py"
         mod = imp.load_source(mod_name, path)
         modules.append(mod)
 
diff --git a/lib/spack/spack/hooks/licensing.py b/lib/spack/spack/hooks/licensing.py
index 02c27b1ec0..6c4224b47c 100644
--- a/lib/spack/spack/hooks/licensing.py
+++ b/lib/spack/spack/hooks/licensing.py
@@ -26,7 +26,7 @@ import os
 
 import spack
 import llnl.util.tty as tty
-from llnl.util.filesystem import join_path, mkdirp
+from llnl.util.filesystem import mkdirp
 
 
 def pre_install(spec):
@@ -156,7 +156,7 @@ def symlink_license(pkg):
     """Create local symlinks that point to the global license file."""
     target = pkg.global_license_file
     for filename in pkg.license_files:
-        link_name = join_path(pkg.prefix, filename)
+        link_name = os.path.join(pkg.prefix, filename)
         link_name = os.path.abspath(link_name)
         license_dir = os.path.dirname(link_name)
         if not os.path.exists(license_dir):
diff --git a/lib/spack/spack/mirror.py b/lib/spack/spack/mirror.py
index 56b02831d6..14e4b482ef 100644
--- a/lib/spack/spack/mirror.py
+++ b/lib/spack/spack/mirror.py
@@ -33,7 +33,7 @@ to download packages directly from a mirror (e.g., on an intranet).
 import sys
 import os
 import llnl.util.tty as tty
-from llnl.util.filesystem import mkdirp, join_path
+from llnl.util.filesystem import mkdirp
 
 import spack.config
 import spack.error
@@ -97,7 +97,7 @@ Spack not to expand it with the following syntax:
 
 def mirror_archive_path(spec, fetcher, resourceId=None):
     """Get the relative path to the spec's archive within a mirror."""
-    return join_path(
+    return os.path.join(
         spec.name, mirror_archive_filename(spec, fetcher, resourceId))
 
 
@@ -222,12 +222,12 @@ def add_single_spec(spec, mirror_root, categories, **kwargs):
                 fetcher = stage.fetcher
                 if ii == 0:
                     # create a subdirectory for the current package@version
-                    archive_path = os.path.abspath(join_path(
+                    archive_path = os.path.abspath(os.path.join(
                         mirror_root, mirror_archive_path(spec, fetcher)))
                     name = spec.cformat("$_$@")
                 else:
                     resource = stage.resource
-                    archive_path = os.path.abspath(join_path(
+                    archive_path = os.path.abspath(os.path.join(
                         mirror_root,
                         mirror_archive_path(spec, fetcher, resource.name)))
                     name = "{resource} ({pkg}).".format(
diff --git a/lib/spack/spack/package.py b/lib/spack/spack/package.py
index 9e4150b9b3..3fdaf56b8d 100644
--- a/lib/spack/spack/package.py
+++ b/lib/spack/spack/package.py
@@ -69,7 +69,7 @@ import spack.util.web
 import spack.multimethod
 import spack.binary_distribution as binary_distribution
 
-from llnl.util.filesystem import mkdirp, join_path, touch
+from llnl.util.filesystem import mkdirp, touch
 from llnl.util.filesystem import working_dir, install_tree, install
 from llnl.util.lang import memoized
 from llnl.util.link_tree import LinkTree
@@ -1226,17 +1226,17 @@ class PackageBase(with_metaclass(PackageMeta, object)):
 
         # Install fake command
         mkdirp(self.prefix.bin)
-        touch(join_path(self.prefix.bin, command))
-        chmod('+x', join_path(self.prefix.bin, command))
+        touch(os.path.join(self.prefix.bin, command))
+        chmod('+x', os.path.join(self.prefix.bin, command))
 
         # Install fake header file
         mkdirp(self.prefix.include)
-        touch(join_path(self.prefix.include, header + '.h'))
+        touch(os.path.join(self.prefix.include, header + '.h'))
 
         # Install fake shared and static libraries
         mkdirp(self.prefix.lib)
         for suffix in [dso_suffix, '.a']:
-            touch(join_path(self.prefix.lib, library + suffix))
+            touch(os.path.join(self.prefix.lib, library + suffix))
 
         # Install fake man page
         mkdirp(self.prefix.man.man1)
@@ -1516,7 +1516,7 @@ class PackageBase(with_metaclass(PackageMeta, object)):
                 else:
                     source_path = self.stage.source_path
                     if install_source and os.path.isdir(source_path):
-                        src_target = join_path(
+                        src_target = os.path.join(
                             self.spec.prefix, 'share', self.name, 'src')
                         tty.msg('Copying source to {0}'.format(src_target))
                         install_tree(self.stage.source_path, src_target)
@@ -1762,7 +1762,7 @@ class PackageBase(with_metaclass(PackageMeta, object)):
         if self.installed:
             return spack.store.layout.build_log_path(self.spec)
         else:
-            return join_path(self.stage.source_path, 'spack-build.out')
+            return os.path.join(self.stage.source_path, 'spack-build.out')
 
     @property
     def module(self):
@@ -2305,7 +2305,7 @@ def dump_packages(spec, path):
             # Locate the dependency package in the install tree and find
             # its provenance information.
             source = spack.store.layout.build_packages_path(node)
-            source_repo_root = join_path(source, node.namespace)
+            source_repo_root = os.path.join(source, node.namespace)
 
             # There's no provenance installed for the source package.  Skip it.
             # User can always get something current from the builtin repo.
@@ -2322,7 +2322,7 @@ def dump_packages(spec, path):
                          node.name)
 
         # Create a destination repository
-        dest_repo_root = join_path(path, node.namespace)
+        dest_repo_root = os.path.join(path, node.namespace)
         if not os.path.exists(dest_repo_root):
             spack.repo.create_repo(dest_repo_root)
         repo = spack.repo.Repo(dest_repo_root)
diff --git a/lib/spack/spack/platforms/cray.py b/lib/spack/spack/platforms/cray.py
index 92f2254429..80bf023ab2 100644
--- a/lib/spack/spack/platforms/cray.py
+++ b/lib/spack/spack/platforms/cray.py
@@ -30,7 +30,6 @@ from spack.util.executable import which
 from spack.architecture import Platform, Target, NoPlatformError
 from spack.operating_systems.cray_frontend import CrayFrontend
 from spack.operating_systems.cnl import Cnl
-from llnl.util.filesystem import join_path
 from spack.util.module_cmd import get_module_cmd, unload_module
 
 
@@ -110,7 +109,7 @@ class Cray(Platform):
             unload_module(module)
 
         env.set('CRAYPE_LINK_TYPE', 'dynamic')
-        cray_wrapper_names = join_path(build_env_path, 'cray')
+        cray_wrapper_names = os.path.join(build_env_path, 'cray')
 
         if os.path.isdir(cray_wrapper_names):
             env.prepend_path('PATH', cray_wrapper_names)
diff --git a/lib/spack/spack/repo.py b/lib/spack/spack/repo.py
index dd6b6ac71d..d0cf1b0ce1 100644
--- a/lib/spack/spack/repo.py
+++ b/lib/spack/spack/repo.py
@@ -47,7 +47,7 @@ import yaml
 
 import llnl.util.lang
 import llnl.util.tty as tty
-from llnl.util.filesystem import mkdirp, join_path, install
+from llnl.util.filesystem import mkdirp, install
 
 import spack
 import spack.config
@@ -142,7 +142,7 @@ class FastPackageChecker(Mapping):
         cache = {}
         for pkg_name in os.listdir(self.packages_path):
             # Skip non-directories in the package root.
-            pkg_dir = join_path(self.packages_path, pkg_name)
+            pkg_dir = os.path.join(self.packages_path, pkg_name)
 
             # Warn about invalid names that look like packages.
             if not valid_module_name(pkg_name):
@@ -635,18 +635,18 @@ class Repo(object):
                 raise BadRepoError(msg)
 
         # Validate repository layout.
-        self.config_file = join_path(self.root, repo_config_name)
+        self.config_file = os.path.join(self.root, repo_config_name)
         check(os.path.isfile(self.config_file),
               "No %s found in '%s'" % (repo_config_name, root))
 
-        self.packages_path = join_path(self.root, packages_dir_name)
+        self.packages_path = os.path.join(self.root, packages_dir_name)
         check(os.path.isdir(self.packages_path),
               "No directory '%s' found in '%s'" % (repo_config_name, root))
 
         # Read configuration and validate namespace
         config = self._read_config()
         check('namespace' in config, '%s must define a namespace.'
-              % join_path(root, repo_config_name))
+              % os.path.join(root, repo_config_name))
 
         self.namespace = config['namespace']
         check(re.match(r'[a-zA-Z][a-zA-Z0-9_.]+', self.namespace),
@@ -899,7 +899,7 @@ class Repo(object):
         """Get the directory name for a particular package.  This is the
            directory that contains its package.py file."""
         self._check_namespace(spec)
-        return join_path(self.packages_path, spec.name)
+        return os.path.join(self.packages_path, spec.name)
 
     @_autospec
     def filename_for_package_name(self, spec):
@@ -913,7 +913,7 @@ class Repo(object):
         """
         self._check_namespace(spec)
         pkg_dir = self.dirname_for_package_name(spec.name)
-        return join_path(pkg_dir, package_file_name)
+        return os.path.join(pkg_dir, package_file_name)
 
     @property
     def _pkg_checker(self):
diff --git a/lib/spack/spack/stage.py b/lib/spack/spack/stage.py
index 9c384d8aec..0c460ddf5f 100644
--- a/lib/spack/spack/stage.py
+++ b/lib/spack/spack/stage.py
@@ -35,7 +35,7 @@ from six.moves.urllib.parse import urljoin
 
 import llnl.util.tty as tty
 import llnl.util.lock
-from llnl.util.filesystem import mkdirp, join_path, can_access
+from llnl.util.filesystem import mkdirp, can_access
 from llnl.util.filesystem import remove_if_dead_link, remove_linked_tree
 
 import spack.paths
@@ -216,7 +216,7 @@ class Stage(object):
         if path is not None:
             self.path = path
         else:
-            self.path = join_path(spack.paths.stage_path, self.name)
+            self.path = os.path.join(spack.paths.stage_path, self.name)
 
         # Flag to decide whether to delete the stage folder on exit or not
         self.keep = keep
@@ -229,7 +229,7 @@ class Stage(object):
             if self.name not in Stage.stage_locks:
                 sha1 = hashlib.sha1(self.name.encode('utf-8')).digest()
                 lock_id = prefix_bits(sha1, bit_length(sys.maxsize))
-                stage_lock_path = join_path(spack.paths.stage_path, '.lock')
+                stage_lock_path = os.path.join(spack.paths.stage_path, '.lock')
 
                 Stage.stage_locks[self.name] = llnl.util.lock.Lock(
                     stage_lock_path, lock_id, 1)
@@ -546,7 +546,7 @@ class ResourceStage(Stage):
         if not isinstance(placement, dict):
             placement = {'': placement}
 
-        target_path = join_path(
+        target_path = os.path.join(
             root_stage.source_path, resource.destination)
 
         try:
@@ -558,8 +558,8 @@ class ResourceStage(Stage):
                 raise
 
         for key, value in iteritems(placement):
-            destination_path = join_path(target_path, value)
-            source_path = join_path(self.source_path, key)
+            destination_path = os.path.join(target_path, value)
+            source_path = os.path.join(self.source_path, key)
 
             if not os.path.exists(destination_path):
                 tty.info('Moving resource stage\n\tsource : '
@@ -665,7 +665,7 @@ def purge():
     """Remove all build directories in the top-level stage path."""
     if os.path.isdir(spack.paths.stage_path):
         for stage_dir in os.listdir(spack.paths.stage_path):
-            stage_path = join_path(spack.paths.stage_path, stage_dir)
+            stage_path = os.path.join(spack.paths.stage_path, stage_dir)
             remove_linked_tree(stage_path)
 
 
diff --git a/lib/spack/spack/test/build_environment.py b/lib/spack/spack/test/build_environment.py
index 653a283b1b..504febffac 100644
--- a/lib/spack/spack/test/build_environment.py
+++ b/lib/spack/spack/test/build_environment.py
@@ -26,16 +26,15 @@ import os
 import pytest
 
 from spack.paths import build_env_path
-from llnl.util.filesystem import join_path
 from spack.build_environment import dso_suffix, _static_to_shared_library
 from spack.util.executable import Executable
 
 
 @pytest.fixture
 def build_environment():
-    cc = Executable(join_path(build_env_path, "cc"))
-    cxx = Executable(join_path(build_env_path, "c++"))
-    fc = Executable(join_path(build_env_path, "fc"))
+    cc = Executable(os.path.join(build_env_path, "cc"))
+    cxx = Executable(os.path.join(build_env_path, "c++"))
+    fc = Executable(os.path.join(build_env_path, "fc"))
 
     realcc = "/bin/mycc"
     prefix = "/spack-test-prefix"
diff --git a/lib/spack/spack/test/cc.py b/lib/spack/spack/test/cc.py
index 25bb01cd05..adc5bfd71b 100644
--- a/lib/spack/spack/test/cc.py
+++ b/lib/spack/spack/test/cc.py
@@ -32,7 +32,7 @@ import tempfile
 import shutil
 
 from spack.paths import build_env_path
-from llnl.util.filesystem import mkdirp, join_path
+from llnl.util.filesystem import mkdirp
 from spack.util.executable import Executable
 
 # Complicated compiler test command
@@ -54,11 +54,11 @@ test_command = [
 class CompilerWrapperTest(unittest.TestCase):
 
     def setUp(self):
-        self.cc = Executable(join_path(build_env_path, "cc"))
-        self.ld = Executable(join_path(build_env_path, "ld"))
-        self.cpp = Executable(join_path(build_env_path, "cpp"))
-        self.cxx = Executable(join_path(build_env_path, "c++"))
-        self.fc = Executable(join_path(build_env_path, "fc"))
+        self.cc = Executable(os.path.join(build_env_path, "cc"))
+        self.ld = Executable(os.path.join(build_env_path, "ld"))
+        self.cpp = Executable(os.path.join(build_env_path, "cpp"))
+        self.cxx = Executable(os.path.join(build_env_path, "c++"))
+        self.fc = Executable(os.path.join(build_env_path, "fc"))
 
         self.realcc = "/bin/mycc"
         self.prefix = "/spack-test-prefix"
@@ -82,20 +82,20 @@ class CompilerWrapperTest(unittest.TestCase):
 
         # Make some fake dependencies
         self.tmp_deps = tempfile.mkdtemp()
-        self.dep1 = join_path(self.tmp_deps, 'dep1')
-        self.dep2 = join_path(self.tmp_deps, 'dep2')
-        self.dep3 = join_path(self.tmp_deps, 'dep3')
-        self.dep4 = join_path(self.tmp_deps, 'dep4')
+        self.dep1 = os.path.join(self.tmp_deps, 'dep1')
+        self.dep2 = os.path.join(self.tmp_deps, 'dep2')
+        self.dep3 = os.path.join(self.tmp_deps, 'dep3')
+        self.dep4 = os.path.join(self.tmp_deps, 'dep4')
 
-        mkdirp(join_path(self.dep1, 'include'))
-        mkdirp(join_path(self.dep1, 'lib'))
+        mkdirp(os.path.join(self.dep1, 'include'))
+        mkdirp(os.path.join(self.dep1, 'lib'))
 
-        mkdirp(join_path(self.dep2, 'lib64'))
+        mkdirp(os.path.join(self.dep2, 'lib64'))
 
-        mkdirp(join_path(self.dep3, 'include'))
-        mkdirp(join_path(self.dep3, 'lib64'))
+        mkdirp(os.path.join(self.dep3, 'include'))
+        mkdirp(os.path.join(self.dep3, 'lib64'))
 
-        mkdirp(join_path(self.dep4, 'include'))
+        mkdirp(os.path.join(self.dep4, 'include'))
 
         if 'SPACK_DEPENDENCIES' in os.environ:
             del os.environ['SPACK_DEPENDENCIES']
diff --git a/lib/spack/spack/test/cmd/install.py b/lib/spack/spack/test/cmd/install.py
index 88f0247cfa..a5448797bd 100644
--- a/lib/spack/spack/test/cmd/install.py
+++ b/lib/spack/spack/test/cmd/install.py
@@ -318,7 +318,7 @@ def test_junit_output_with_failures(tmpdir, exc_typename, msg):
 
 @pytest.mark.disable_clean_stage_check
 @pytest.mark.parametrize('exc_typename,msg', [
-#    ('RuntimeError', 'something weird happened'),
+    ('RuntimeError', 'something weird happened'),
     ('KeyboardInterrupt', 'Ctrl-C strikes again')
 ])
 def test_junit_output_with_errors(
diff --git a/lib/spack/spack/test/directory_layout.py b/lib/spack/spack/test/directory_layout.py
index ac12381e75..2277196a05 100644
--- a/lib/spack/spack/test/directory_layout.py
+++ b/lib/spack/spack/test/directory_layout.py
@@ -28,8 +28,6 @@ This test verifies that the Spack directory layout works properly.
 import os
 import pytest
 
-from llnl.util.filesystem import join_path
-
 import spack.paths
 import spack.repo
 from spack.directory_layout import YamlDirectoryLayout
@@ -213,7 +211,7 @@ def test_handle_unknown_package(
         # enough to read a spec from the spec file.
         for spec, path in installed_specs.items():
             spec_from_file = layout.read_spec(
-                join_path(path, '.spack', 'spec.yaml'))
+                os.path.join(path, '.spack', 'spec.yaml'))
 
             # To satisfy these conditions, directory layouts need to
             # read in concrete specs from their install dirs somehow.
diff --git a/lib/spack/spack/test/git_fetch.py b/lib/spack/spack/test/git_fetch.py
index 127096b52b..dc925286ba 100644
--- a/lib/spack/spack/test/git_fetch.py
+++ b/lib/spack/spack/test/git_fetch.py
@@ -26,7 +26,7 @@ import os
 
 import pytest
 
-from llnl.util.filesystem import working_dir, join_path, touch
+from llnl.util.filesystem import working_dir, touch
 
 import spack.repo
 import spack.config
@@ -103,7 +103,7 @@ def test_fetch(type_of_test,
         with working_dir(pkg.stage.source_path):
             assert h('HEAD') == h(t.revision)
 
-            file_path = join_path(pkg.stage.source_path, t.file)
+            file_path = os.path.join(pkg.stage.source_path, t.file)
             assert os.path.isdir(pkg.stage.source_path)
             assert os.path.isfile(file_path)
 
diff --git a/lib/spack/spack/test/hg_fetch.py b/lib/spack/spack/test/hg_fetch.py
index 7c3878e9f9..e36f1ebb84 100644
--- a/lib/spack/spack/test/hg_fetch.py
+++ b/lib/spack/spack/test/hg_fetch.py
@@ -26,7 +26,7 @@ import os
 
 import pytest
 
-from llnl.util.filesystem import working_dir, join_path, touch
+from llnl.util.filesystem import working_dir, touch
 
 import spack.repo
 import spack.config
@@ -75,7 +75,7 @@ def test_fetch(
         with working_dir(pkg.stage.source_path):
             assert h() == t.revision
 
-            file_path = join_path(pkg.stage.source_path, t.file)
+            file_path = os.path.join(pkg.stage.source_path, t.file)
             assert os.path.isdir(pkg.stage.source_path)
             assert os.path.isfile(file_path)
 
diff --git a/lib/spack/spack/test/llnl/util/lock.py b/lib/spack/spack/test/llnl/util/lock.py
index 5c30650a23..c84573e75e 100644
--- a/lib/spack/spack/test/llnl/util/lock.py
+++ b/lib/spack/spack/test/llnl/util/lock.py
@@ -72,7 +72,7 @@ from multiprocessing import Process
 
 import pytest
 
-from llnl.util.filesystem import join_path, touch
+from llnl.util.filesystem import touch
 from spack.util.multiproc import Barrier
 from llnl.util.lock import Lock, WriteTransaction, ReadTransaction, LockError
 
@@ -180,7 +180,7 @@ def private_lock_path(lock_dir):
 
     For other modes, it is the same as a shared lock.
     """
-    lock_file = join_path(lock_dir, 'lockfile')
+    lock_file = os.path.join(lock_dir, 'lockfile')
     if mpi:
         lock_file += '.%s' % comm.rank
     yield lock_file
@@ -189,7 +189,7 @@ def private_lock_path(lock_dir):
 @pytest.fixture
 def lock_path(lock_dir):
     """This lock is shared among all processes in a multiproc test."""
-    lock_file = join_path(lock_dir, 'lockfile')
+    lock_file = os.path.join(lock_dir, 'lockfile')
     yield lock_file
 
 
diff --git a/lib/spack/spack/test/make_executable.py b/lib/spack/spack/test/make_executable.py
index 23df9ca1e4..e6593b8ffa 100644
--- a/lib/spack/spack/test/make_executable.py
+++ b/lib/spack/spack/test/make_executable.py
@@ -32,7 +32,6 @@ import shutil
 import tempfile
 import unittest
 
-from llnl.util.filesystem import join_path
 from spack.build_environment import MakeExecutable
 from spack.util.environment import path_put_first
 
@@ -42,7 +41,7 @@ class MakeExecutableTest(unittest.TestCase):
     def setUp(self):
         self.tmpdir = tempfile.mkdtemp()
 
-        make_exe = join_path(self.tmpdir, 'make')
+        make_exe = os.path.join(self.tmpdir, 'make')
         with open(make_exe, 'w') as f:
             f.write('#!/bin/sh\n')
             f.write('echo "$@"')
diff --git a/lib/spack/spack/test/mirror.py b/lib/spack/spack/test/mirror.py
index 5b397cc129..2df15c1486 100644
--- a/lib/spack/spack/test/mirror.py
+++ b/lib/spack/spack/test/mirror.py
@@ -26,8 +26,6 @@ import filecmp
 import os
 import pytest
 
-from llnl.util.filesystem import join_path
-
 import spack.repo
 import spack.mirror
 import spack.util.executable
@@ -66,7 +64,7 @@ def set_up_package(name, repository, url_attr):
 
 def check_mirror():
     with Stage('spack-mirror-test') as stage:
-        mirror_root = join_path(stage.path, 'test-mirror')
+        mirror_root = os.path.join(stage.path, 'test-mirror')
         # register mirror with spack config
         mirrors = {'spack-mirror-test': 'file://' + mirror_root}
         spack.config.set('mirrors', mirrors)
@@ -77,7 +75,7 @@ def check_mirror():
 
         # check that there are subdirs for each package
         for name in repos:
-            subdir = join_path(mirror_root, name)
+            subdir = os.path.join(mirror_root, name)
             assert os.path.isdir(subdir)
 
             files = os.listdir(subdir)
@@ -96,7 +94,7 @@ def check_mirror():
                         original_path = mock_repo.path
                         if 'svn' in name:
                             # have to check out the svn repo to compare.
-                            original_path = join_path(
+                            original_path = os.path.join(
                                 mock_repo.path, 'checked_out')
 
                             svn = which('svn', required=True)
diff --git a/lib/spack/spack/test/packages.py b/lib/spack/spack/test/packages.py
index 5c71a81101..2d9878ed96 100644
--- a/lib/spack/spack/test/packages.py
+++ b/lib/spack/spack/test/packages.py
@@ -22,10 +22,9 @@
 # License along with this program; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ##############################################################################
+import os.path
 import pytest
 
-from llnl.util.filesystem import join_path
-
 import spack.repo
 from spack.paths import mock_packages_path
 from spack.util.naming import mod_to_class
@@ -45,7 +44,7 @@ class TestPackage(object):
     def test_package_filename(self):
         repo = spack.repo.Repo(mock_packages_path)
         filename = repo.filename_for_package_name('mpich')
-        assert filename == join_path(
+        assert filename == os.path.join(
             mock_packages_path,
             'packages',
             'mpich',
@@ -55,7 +54,7 @@ class TestPackage(object):
     def test_nonexisting_package_filename(self):
         repo = spack.repo.Repo(mock_packages_path)
         filename = repo.filename_for_package_name('some-nonexisting-package')
-        assert filename == join_path(
+        assert filename == os.path.join(
             mock_packages_path,
             'packages',
             'some-nonexisting-package',
diff --git a/lib/spack/spack/test/stage.py b/lib/spack/spack/test/stage.py
index 01b4fa9e90..0d76fe5ede 100644
--- a/lib/spack/spack/test/stage.py
+++ b/lib/spack/spack/test/stage.py
@@ -28,7 +28,7 @@ import collections
 
 import pytest
 
-from llnl.util.filesystem import join_path, working_dir
+from llnl.util.filesystem import working_dir
 
 import spack.paths
 import spack.stage
@@ -43,9 +43,9 @@ def check_expand_archive(stage, stage_name, mock_archive):
     assert archive_name in os.listdir(stage_path)
     assert archive_dir in os.listdir(stage_path)
 
-    assert join_path(stage_path, archive_dir) == stage.source_path
+    assert os.path.join(stage_path, archive_dir) == stage.source_path
 
-    readme = join_path(stage_path, archive_dir, 'README.txt')
+    readme = os.path.join(stage_path, archive_dir, 'README.txt')
     assert os.path.isfile(readme)
     with open(readme) as file:
         'hello world!\n' == file.read()
@@ -55,7 +55,7 @@ def check_fetch(stage, stage_name):
     archive_name = 'test-files.tar.gz'
     stage_path = get_stage_path(stage, stage_name)
     assert archive_name in os.listdir(stage_path)
-    assert join_path(stage_path, archive_name) == stage.fetcher.archive_file
+    assert os.path.join(stage_path, archive_name) == stage.fetcher.archive_file
 
 
 def check_destroy(stage, stage_name):
diff --git a/lib/spack/spack/test/svn_fetch.py b/lib/spack/spack/test/svn_fetch.py
index 323fb7ddf8..fc86c0ae0d 100644
--- a/lib/spack/spack/test/svn_fetch.py
+++ b/lib/spack/spack/test/svn_fetch.py
@@ -26,7 +26,7 @@ import os
 
 import pytest
 
-from llnl.util.filesystem import join_path, touch, working_dir
+from llnl.util.filesystem import touch, working_dir
 
 import spack.repo
 import spack.config
@@ -75,7 +75,7 @@ def test_fetch(
         with working_dir(pkg.stage.source_path):
             assert h() == t.revision
 
-            file_path = join_path(pkg.stage.source_path, t.file)
+            file_path = os.path.join(pkg.stage.source_path, t.file)
             assert os.path.isdir(pkg.stage.source_path)
             assert os.path.isfile(file_path)
 
diff --git a/lib/spack/spack/test/test_activations.py b/lib/spack/spack/test/test_activations.py
index 34e5c8d0b3..dcccbaa05d 100644
--- a/lib/spack/spack/test/test_activations.py
+++ b/lib/spack/spack/test/test_activations.py
@@ -22,15 +22,13 @@
 # License along with this program; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ##############################################################################
+import os
+import pytest
 
 import spack
-from llnl.util.filesystem import join_path
 from spack.directory_layout import YamlDirectoryLayout
 from spack.filesystem_view import YamlFilesystemView
 
-import os
-import pytest
-
 
 class FakeExtensionPackage(object):
     def __init__(self, name, prefix):
@@ -97,7 +95,7 @@ def python_and_extension_dirs(tmpdir):
     create_dir_structure(ext_prefix, ext_dirs)
 
     easy_install_location = 'lib/python2.7/site-packages/easy-install.pth'
-    with open(join_path(ext_prefix, easy_install_location), 'w') as F:
+    with open(str(ext_prefix.join(easy_install_location)), 'w') as F:
         F.write("""path/to/ext1.egg
 path/to/setuptools.egg""")
 
@@ -137,10 +135,10 @@ def test_python_activation_with_files(tmpdir, python_and_extension_dirs):
     python_pkg = python_spec.package
     python_pkg.activate(ext_pkg)
 
-    assert os.path.exists(join_path(python_prefix, 'bin/py-ext-tool'))
+    assert os.path.exists(os.path.join(python_prefix, 'bin/py-ext-tool'))
 
     easy_install_location = 'lib/python2.7/site-packages/easy-install.pth'
-    with open(join_path(python_prefix, easy_install_location), 'r') as F:
+    with open(os.path.join(python_prefix, easy_install_location), 'r') as F:
         easy_install_contents = F.read()
 
     assert 'ext1.egg' in easy_install_contents
@@ -163,9 +161,9 @@ def test_python_activation_view(tmpdir, python_and_extension_dirs):
     python_pkg = python_spec.package
     python_pkg.activate(ext_pkg, extensions_layout=view.extensions_layout)
 
-    assert not os.path.exists(join_path(python_prefix, 'bin/py-ext-tool'))
+    assert not os.path.exists(os.path.join(python_prefix, 'bin/py-ext-tool'))
 
-    assert os.path.exists(join_path(view_dir, 'bin/py-ext-tool'))
+    assert os.path.exists(os.path.join(view_dir, 'bin/py-ext-tool'))
 
 
 @pytest.fixture()
@@ -247,7 +245,7 @@ def test_perl_activation_with_files(tmpdir, perl_and_extension_dirs):
     perl_pkg = perl_spec.package
     perl_pkg.activate(ext_pkg)
 
-    assert os.path.exists(join_path(perl_prefix, 'bin/perl-ext-tool'))
+    assert os.path.exists(os.path.join(perl_prefix, 'bin/perl-ext-tool'))
 
 
 def test_perl_activation_view(tmpdir, perl_and_extension_dirs):
@@ -266,6 +264,6 @@ def test_perl_activation_view(tmpdir, perl_and_extension_dirs):
     perl_pkg = perl_spec.package
     perl_pkg.activate(ext_pkg, extensions_layout=view.extensions_layout)
 
-    assert not os.path.exists(join_path(perl_prefix, 'bin/perl-ext-tool'))
+    assert not os.path.exists(os.path.join(perl_prefix, 'bin/perl-ext-tool'))
 
-    assert os.path.exists(join_path(view_dir, 'bin/perl-ext-tool'))
+    assert os.path.exists(os.path.join(view_dir, 'bin/perl-ext-tool'))
diff --git a/lib/spack/spack/util/file_cache.py b/lib/spack/spack/util/file_cache.py
index 37e2bcf0a6..d0551faff9 100644
--- a/lib/spack/spack/util/file_cache.py
+++ b/lib/spack/spack/util/file_cache.py
@@ -25,7 +25,7 @@
 import os
 import shutil
 
-from llnl.util.filesystem import mkdirp, join_path
+from llnl.util.filesystem import mkdirp
 from llnl.util.lock import Lock, ReadTransaction, WriteTransaction
 
 from spack.error import SpackError
@@ -57,7 +57,7 @@ class FileCache(object):
     def destroy(self):
         """Remove all files under the cache root."""
         for f in os.listdir(self.root):
-            path = join_path(self.root, f)
+            path = os.path.join(self.root, f)
             if os.path.isdir(path):
                 shutil.rmtree(path, True)
             else:
@@ -65,14 +65,14 @@ class FileCache(object):
 
     def cache_path(self, key):
         """Path to the file in the cache for a particular key."""
-        return join_path(self.root, key)
+        return os.path.join(self.root, key)
 
     def _lock_path(self, key):
         """Path to the file in the cache for a particular key."""
         keyfile = os.path.basename(key)
         keydir = os.path.dirname(key)
 
-        return join_path(self.root, keydir, '.' + keyfile + '.lock')
+        return os.path.join(self.root, keydir, '.' + keyfile + '.lock')
 
     def _get_lock(self, key):
         """Create a lock for a key, if necessary, and return a lock object."""