Skip fetch tests for tools that are not installed. (#4059)

This allows people on systems that don't have all the fetchers to still
run Spack tests. Mark tests that require git, subversion, or mercurial to
be skipped if they're not installed.

lib/spack/spack/test/git_fetch.py

@@ -29,6 +29,11 @@
 from llnl.util.filesystem import *
 from spack.spec import Spec
 from spack.version import ver
+from spack.util.executable import which
+
+
+pytestmark = pytest.mark.skipif(
+    not which('git'), reason='requires git to be installed')
 
 
 @pytest.mark.parametrize("type_of_test", ['master', 'branch', 'tag', 'commit'])

lib/spack/spack/test/hg_fetch.py

@@ -29,6 +29,11 @@
 from llnl.util.filesystem import *
 from spack.spec import Spec
 from spack.version import ver
+from spack.util.executable import which
+
+
+pytestmark = pytest.mark.skipif(
+    not which('hg'), reason='requires mercurial to be installed')
 
 
 @pytest.mark.parametrize("type_of_test", ['default', 'rev0'])

lib/spack/spack/test/mirror.py

@@ -26,18 +26,20 @@
 import os
 import pytest
 
+from llnl.util.filesystem import join_path
+
 import spack
 import spack.mirror
 import spack.util.executable
-from llnl.util.filesystem import join_path
 from spack.spec import Spec
 from spack.stage import Stage
+from spack.util.executable import which
 
 # paths in repos that shouldn't be in the mirror tarballs.
 exclude = ['.hg', '.git', '.svn']
 
+
 repos = {}
-svn = spack.util.executable.which('svn', required=True)
 
 
 def set_up_package(name, repository, url_attr):
@@ -95,13 +97,17 @@ def check_mirror():
                     # Stage the archive from the mirror and cd to it.
                     spack.do_checksum = False
                     pkg.do_stage(mirror_only=True)
+
                     # Compare the original repo with the expanded archive
                     original_path = mock_repo.path
                     if 'svn' in name:
                         # have to check out the svn repo to compare.
                         original_path = join_path(
                             mock_repo.path, 'checked_out')
+
+                        svn = which('svn', required=True)
                         svn('checkout', mock_repo.url, original_path)
+
                     dcmp = filecmp.dircmp(original_path, pkg.stage.source_path)
                     # make sure there are no new files in the expanded
                     # tarball
@@ -113,33 +119,42 @@ def check_mirror():
 
 @pytest.mark.usefixtures('config', 'refresh_builtin_mock')
 class TestMirror(object):
+    def test_url_mirror(self, mock_archive):
+        set_up_package('trivial-install-test-package', mock_archive, 'url')
+        check_mirror()
+        repos.clear()
+
+    @pytest.mark.skipif(
+        not which('git'), reason='requires git to be installed')
     def test_git_mirror(self, mock_git_repository):
         set_up_package('git-test', mock_git_repository, 'git')
         check_mirror()
         repos.clear()
 
+    @pytest.mark.skipif(
+        not which('svn'), reason='requires subversion to be installed')
     def test_svn_mirror(self, mock_svn_repository):
         set_up_package('svn-test', mock_svn_repository, 'svn')
         check_mirror()
         repos.clear()
 
+    @pytest.mark.skipif(
+        not which('hg'), reason='requires mercurial to be installed')
     def test_hg_mirror(self, mock_hg_repository):
         set_up_package('hg-test', mock_hg_repository, 'hg')
         check_mirror()
         repos.clear()
 
-    def test_url_mirror(self, mock_archive):
-        set_up_package('trivial-install-test-package', mock_archive, 'url')
-        check_mirror()
-        repos.clear()
-
+    @pytest.mark.skipif(
+        not all([which('svn'), which('hg'), which('git')]),
+        reason='requires subversion, git, and mercurial to be installed')
     def test_all_mirror(
             self,
             mock_git_repository,
             mock_svn_repository,
             mock_hg_repository,
-            mock_archive,
-    ):
+            mock_archive):
+
         set_up_package('git-test', mock_git_repository, 'git')
         set_up_package('svn-test', mock_svn_repository, 'svn')
         set_up_package('hg-test', mock_hg_repository, 'hg')

lib/spack/spack/test/svn_fetch.py

@@ -29,6 +29,11 @@
 from llnl.util.filesystem import *
 from spack.spec import Spec
 from spack.version import ver
+from spack.util.executable import which
+
+
+pytestmark = pytest.mark.skipif(
+    not which('svn'), reason='requires subversion to be installed')
 
 
 @pytest.mark.parametrize("type_of_test", ['default', 'rev0'])