--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/python3.8/site-packages/pip/_vendor/pep517/check.py	Mon Jul 27 03:47:31 2020 -0400
@@ -0,0 +1,203 @@
+"""Check a project and backend by attempting to build using PEP 517 hooks.
+"""
+import argparse
+import logging
+import os
+from os.path import isfile, join as pjoin
+from toml import TomlDecodeError, load as toml_load
+import shutil
+from subprocess import CalledProcessError
+import sys
+import tarfile
+from tempfile import mkdtemp
+import zipfile
+
+from .colorlog import enable_colourful_output
+from .envbuild import BuildEnvironment
+from .wrappers import Pep517HookCaller
+
+log = logging.getLogger(__name__)
+
+
+def check_build_sdist(hooks, build_sys_requires):
+    with BuildEnvironment() as env:
+        try:
+            env.pip_install(build_sys_requires)
+            log.info('Installed static build dependencies')
+        except CalledProcessError:
+            log.error('Failed to install static build dependencies')
+            return False
+
+        try:
+            reqs = hooks.get_requires_for_build_sdist({})
+            log.info('Got build requires: %s', reqs)
+        except Exception:
+            log.error('Failure in get_requires_for_build_sdist', exc_info=True)
+            return False
+
+        try:
+            env.pip_install(reqs)
+            log.info('Installed dynamic build dependencies')
+        except CalledProcessError:
+            log.error('Failed to install dynamic build dependencies')
+            return False
+
+        td = mkdtemp()
+        log.info('Trying to build sdist in %s', td)
+        try:
+            try:
+                filename = hooks.build_sdist(td, {})
+                log.info('build_sdist returned %r', filename)
+            except Exception:
+                log.info('Failure in build_sdist', exc_info=True)
+                return False
+
+            if not filename.endswith('.tar.gz'):
+                log.error(
+                    "Filename %s doesn't have .tar.gz extension", filename)
+                return False
+
+            path = pjoin(td, filename)
+            if isfile(path):
+                log.info("Output file %s exists", path)
+            else:
+                log.error("Output file %s does not exist", path)
+                return False
+
+            if tarfile.is_tarfile(path):
+                log.info("Output file is a tar file")
+            else:
+                log.error("Output file is not a tar file")
+                return False
+
+        finally:
+            shutil.rmtree(td)
+
+        return True
+
+
+def check_build_wheel(hooks, build_sys_requires):
+    with BuildEnvironment() as env:
+        try:
+            env.pip_install(build_sys_requires)
+            log.info('Installed static build dependencies')
+        except CalledProcessError:
+            log.error('Failed to install static build dependencies')
+            return False
+
+        try:
+            reqs = hooks.get_requires_for_build_wheel({})
+            log.info('Got build requires: %s', reqs)
+        except Exception:
+            log.error('Failure in get_requires_for_build_sdist', exc_info=True)
+            return False
+
+        try:
+            env.pip_install(reqs)
+            log.info('Installed dynamic build dependencies')
+        except CalledProcessError:
+            log.error('Failed to install dynamic build dependencies')
+            return False
+
+        td = mkdtemp()
+        log.info('Trying to build wheel in %s', td)
+        try:
+            try:
+                filename = hooks.build_wheel(td, {})
+                log.info('build_wheel returned %r', filename)
+            except Exception:
+                log.info('Failure in build_wheel', exc_info=True)
+                return False
+
+            if not filename.endswith('.whl'):
+                log.error("Filename %s doesn't have .whl extension", filename)
+                return False
+
+            path = pjoin(td, filename)
+            if isfile(path):
+                log.info("Output file %s exists", path)
+            else:
+                log.error("Output file %s does not exist", path)
+                return False
+
+            if zipfile.is_zipfile(path):
+                log.info("Output file is a zip file")
+            else:
+                log.error("Output file is not a zip file")
+                return False
+
+        finally:
+            shutil.rmtree(td)
+
+        return True
+
+
+def check(source_dir):
+    pyproject = pjoin(source_dir, 'pyproject.toml')
+    if isfile(pyproject):
+        log.info('Found pyproject.toml')
+    else:
+        log.error('Missing pyproject.toml')
+        return False
+
+    try:
+        with open(pyproject) as f:
+            pyproject_data = toml_load(f)
+        # Ensure the mandatory data can be loaded
+        buildsys = pyproject_data['build-system']
+        requires = buildsys['requires']
+        backend = buildsys['build-backend']
+        backend_path = buildsys.get('backend-path')
+        log.info('Loaded pyproject.toml')
+    except (TomlDecodeError, KeyError):
+        log.error("Invalid pyproject.toml", exc_info=True)
+        return False
+
+    hooks = Pep517HookCaller(source_dir, backend, backend_path)
+
+    sdist_ok = check_build_sdist(hooks, requires)
+    wheel_ok = check_build_wheel(hooks, requires)
+
+    if not sdist_ok:
+        log.warning('Sdist checks failed; scroll up to see')
+    if not wheel_ok:
+        log.warning('Wheel checks failed')
+
+    return sdist_ok
+
+
+def main(argv=None):
+    ap = argparse.ArgumentParser()
+    ap.add_argument(
+        'source_dir',
+        help="A directory containing pyproject.toml")
+    args = ap.parse_args(argv)
+
+    enable_colourful_output()
+
+    ok = check(args.source_dir)
+
+    if ok:
+        print(ansi('Checks passed', 'green'))
+    else:
+        print(ansi('Checks failed', 'red'))
+        sys.exit(1)
+
+
+ansi_codes = {
+    'reset': '\x1b[0m',
+    'bold': '\x1b[1m',
+    'red': '\x1b[31m',
+    'green': '\x1b[32m',
+}
+
+
+def ansi(s, attr):
+    if os.name != 'nt' and sys.stdout.isatty():
+        return ansi_codes[attr] + str(s) + ansi_codes['reset']
+    else:
+        return str(s)
+
+
+if __name__ == '__main__':
+    main()