tests/frontend/buildcheckout.py: Fix bad filename issue for Windows

In BuildStream/buildstream!1028, we added a test specifically to test
that BuildStream correctly raises an warning when the name of an element
contains characters that are invalid on Windows. Unfortunately, we
didn't see it coming that it would make it impossible to checkout this
branch on Windows.

Fix it by generating this file, only if we are not running on Windows.

* tests/testutils/site.py: Add `IS_WINDOWS` check
* tests/frontend/buildcheckout.py: Generate file with invalid filename
  on the fly
* Remove tests/frontend/project/elements/invalid-chars.

Fixes #842.

Note that this may still cause issues on WSL when running tests on a
shared filesystem, but that seems to be a generic issue on WSL with
`os.rename`.

3 files changed, 24 insertions, 5 deletions

diff --git a/tests/frontend/buildcheckout.py b/tests/frontend/buildcheckout.py
index dc7ce6847..287fb6034 100644
--- a/tests/frontend/buildcheckout.py
+++ b/tests/frontend/buildcheckout.py
@@ -3,6 +3,7 @@ import tarfile
 import hashlib
 import pytest
 from tests.testutils import cli, create_repo, ALL_REPO_KINDS, generate_junction
+from tests.testutils.site import IS_WINDOWS
 
 from buildstream import _yaml
 from buildstream._exceptions import ErrorDomain, LoadErrorReason
@@ -85,16 +86,37 @@ def test_build_invalid_suffix_dep(datafiles, cli, strict, hardlinks):
     result.assert_main_error(ErrorDomain.LOAD, "bad-element-suffix")
 
 
+@pytest.mark.skipif(IS_WINDOWS, reason='Not available on Windows')
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_invalid_filename_chars(datafiles, cli):
     project = os.path.join(datafiles.dirname, datafiles.basename)
-    result = cli.run(project=project, args=strict_args(['build', 'invalid-chars|<>-in-name.bst'], 'non-strict'))
+    element_name = 'invalid-chars|<>-in-name.bst'
+
+    # The name of this file contains characters that are not allowed by
+    # BuildStream, using it should raise a warning.
+    element = {
+        'kind': 'stack',
+    }
+    _yaml.dump(element, os.path.join(project, 'elements', element_name))
+
+    result = cli.run(project=project, args=strict_args(['build', element_name], 'non-strict'))
     result.assert_main_error(ErrorDomain.LOAD, "bad-characters-in-name")
 
 
+@pytest.mark.skipif(IS_WINDOWS, reason='Not available on Windows')
 @pytest.mark.datafiles(DATA_DIR)
 def test_build_invalid_filename_chars_dep(datafiles, cli):
     project = os.path.join(datafiles.dirname, datafiles.basename)
+    element_name = 'invalid-chars|<>-in-name.bst'
+
+    # The name of this file contains characters that are not allowed by
+    # BuildStream, and is listed as a dependency of 'invalid-chars-in-dep.bst'.
+    # This should also raise a warning.
+    element = {
+        'kind': 'stack',
+    }
+    _yaml.dump(element, os.path.join(project, 'elements', element_name))
+
     result = cli.run(project=project, args=strict_args(['build', 'invalid-chars-in-dep.bst'], 'non-strict'))
     result.assert_main_error(ErrorDomain.LOAD, "bad-characters-in-name")
 
diff --git a/tests/frontend/project/elements/invalid-chars|<>-in-name.bst b/tests/frontend/project/elements/invalid-chars|<>-in-name.bst
deleted file mode 100644
index bc6a13110..000000000
--- a/tests/frontend/project/elements/invalid-chars|<>-in-name.bst
+++ /dev/null
@@ -1,4 +0,0 @@
-kind: stack
-description: |
-  The name of this files contains characters that are not allowed by
-  BuildStream, using it should raise a warning.
diff --git a/tests/testutils/site.py b/tests/testutils/site.py
index c7625cccf..6ef22babb 100644
--- a/tests/testutils/site.py
+++ b/tests/testutils/site.py
@@ -52,5 +52,6 @@ except ImportError:
     HAVE_ARPY = False
 
 IS_LINUX = os.getenv('BST_FORCE_BACKEND', sys.platform).startswith('linux')
+IS_WINDOWS = (os.name == 'nt')
 
 MACHINE_ARCH = Platform.get_host_arch()