bpo-30871: Add test.pythoninfo (#3075)

* Add Lib/test/pythoninfo.py: script collecting various informations
  about Python to help debugging test failures.
* regrtest: remove sys.hash_info and sys.flags from header.
* Travis CI, Appveyor: run pythoninfo before tests

2 files changed, 407 insertions, 3 deletions

diff --git a/Lib/test/libregrtest/main.py b/Lib/test/libregrtest/main.py
index 0b48beb..9871a28 100644
--- a/Lib/test/libregrtest/main.py
+++ b/Lib/test/libregrtest/main.py
@@ -424,8 +424,6 @@ class Regrtest:
         print("==", platform.python_implementation(), *sys.version.split())
         print("==", platform.platform(aliased=True),
                       "%s-endian" % sys.byteorder)
-        print("== hash algorithm:", sys.hash_info.algorithm,
-              "64bit" if sys.maxsize > 2**32 else "32bit")
         print("== cwd:", os.getcwd())
         cpu_count = os.cpu_count()
         if cpu_count:
@@ -433,7 +431,6 @@ class Regrtest:
         print("== encodings: locale=%s, FS=%s"
               % (locale.getpreferredencoding(False),
                  sys.getfilesystemencoding()))
-        print("Testing with flags:", sys.flags)
 
     def run_tests(self):
         # For a partial run, we do not need to clutter the output.
diff --git a/Lib/test/pythoninfo.py b/Lib/test/pythoninfo.py
new file mode 100644
index 0000000..03081b6
--- /dev/null
+++ b/Lib/test/pythoninfo.py
@@ -0,0 +1,407 @@
+"""
+Collect various informations about Python to help debugging test failures.
+"""
+from __future__ import print_function
+import re
+import sys
+import traceback
+
+
+def normalize_text(text):
+    if text is None:
+        return None
+    text = str(text)
+    text = re.sub(r'\s+', ' ', text)
+    return text.strip()
+
+
+class PythonInfo:
+    def __init__(self):
+        self.info = {}
+
+    def add(self, key, value):
+        if key in self.info:
+            raise ValueError("duplicate key: %r" % key)
+
+        if isinstance(value, str):
+            value = value.strip()
+            if not value:
+                return
+        elif value is None:
+            return
+        elif not isinstance(value, int):
+            raise TypeError("value type must be str, int or None")
+
+        self.info[key] = value
+
+    def get_infos(self):
+        """
+        Get informations as a key:value dictionary where values are strings.
+        """
+        return {key: str(value) for key, value in self.info.items()}
+
+
+def copy_attributes(info_add, obj, name_fmt, attributes, *, formatter=None):
+    for attr in attributes:
+        value = getattr(obj, attr, None)
+        if value is None:
+            continue
+        name = name_fmt % attr
+        if formatter is not None:
+            value = formatter(attr, value)
+        info_add(name, value)
+
+
+def collect_sys(info_add):
+    def format_attr(attr, value):
+        if attr == 'flags':
+            # convert sys.flags tuple to string
+            return str(value)
+        else:
+            return value
+
+    attributes = (
+        '_framework',
+        'byteorder',
+        'executable',
+        'flags',
+        'maxsize',
+        'maxunicode',
+        'version',
+    )
+    copy_attributes(info_add, sys, 'sys.%s', attributes,
+                    formatter=format_attr)
+
+    encoding = sys.getfilesystemencoding()
+    if hasattr(sys, 'getfilesystemencodeerrors'):
+        encoding = '%s/%s' % (encoding, sys.getfilesystemencodeerrors())
+    info_add('sys.filesystem_encoding', encoding)
+
+    for name in ('stdin', 'stdout', 'stderr'):
+        stream = getattr(sys, name)
+        if stream is None:
+            continue
+        encoding = getattr(stream, 'encoding', None)
+        if not encoding:
+            continue
+        errors = getattr(stream, 'errors', None)
+        if errors:
+            encoding = '%s/%s' % (encoding, errors)
+        info_add('sys.%s.encoding' % name, encoding)
+
+    if hasattr(sys, 'hash_info'):
+        alg = sys.hash_info.algorithm
+        bits = 64 if sys.maxsize > 2**32 else 32
+        alg = '%s (%s bits)' % (alg, bits)
+        info_add('sys.hash_info', alg)
+
+    if hasattr(sys, 'getandroidapilevel'):
+        info_add('sys.androidapilevel', sys.getandroidapilevel())
+
+
+def collect_platform(info_add):
+    import platform
+
+    arch = platform.architecture()
+    arch = ' '.join(filter(bool, arch))
+    info_add('platform.architecture', arch)
+
+    info_add('platform.python_implementation',
+             platform.python_implementation())
+    info_add('platform.platform',
+             platform.platform(aliased=True))
+
+
+def collect_locale(info_add):
+    import locale
+
+    info_add('locale.encoding', locale.getpreferredencoding(False))
+
+
+def collect_os(info_add):
+    import os
+
+    if hasattr(os, 'getrandom'):
+        # PEP 524: Check is system urandom is initialized
+        try:
+            os.getrandom(1, os.GRND_NONBLOCK)
+            state = 'ready (initialized)'
+        except BlockingIOError as exc:
+            state = 'not seeded yet (%s)' % exc
+        info_add('os.getrandom', state)
+
+    info_add("os.cwd", os.getcwd())
+
+    if hasattr(os, 'getuid'):
+        info_add("os.uid", os.getuid())
+        info_add("os.gid", os.getgid())
+
+    if hasattr(os, 'getgroups'):
+        groups = os.getgroups()
+        groups = map(str, groups)
+        groups = ', '.join(groups)
+        info_add("os.groups", groups)
+
+    if hasattr(os, 'getlogin'):
+        try:
+            login = os.getlogin()
+        except OSError:
+            # getlogin() fails with "OSError: [Errno 25] Inappropriate ioctl
+            # for device" on Travis CI
+            pass
+        else:
+            info_add("os.login", login)
+
+    if hasattr(os, 'cpu_count'):
+        cpu_count = os.cpu_count()
+        if cpu_count:
+            info_add('os.cpu_count', cpu_count)
+
+    if hasattr(os, 'getloadavg'):
+        load = os.getloadavg()
+        info_add('os.loadavg', str(load))
+
+    # Get environment variables: filter to list
+    # to not leak sensitive information
+    ENV_VARS = (
+        "CC",
+        "COMSPEC",
+        "DISPLAY",
+        "DISTUTILS_USE_SDK",
+        "DYLD_LIBRARY_PATH",
+        "HOME",
+        "HOMEDRIVE",
+        "HOMEPATH",
+        "LANG",
+        "LD_LIBRARY_PATH",
+        "MACOSX_DEPLOYMENT_TARGET",
+        "MAKEFLAGS",
+        "MSSDK",
+        "PATH",
+        "SDK_TOOLS_BIN",
+        "SHELL",
+        "TEMP",
+        "TERM",
+        "TMP",
+        "TMPDIR",
+        "USERPROFILE",
+        "WAYLAND_DISPLAY",
+    )
+    for name, value in os.environ.items():
+        uname = name.upper()
+        if (uname in ENV_VARS or uname.startswith(("PYTHON", "LC_"))
+           # Visual Studio: VS140COMNTOOLS
+           or (uname.startswith("VS") and uname.endswith("COMNTOOLS"))):
+            info_add('os.environ[%s]' % name, value)
+
+
+def collect_readline(info_add):
+    try:
+        import readline
+    except ImportError:
+        return
+
+    def format_attr(attr, value):
+        if isinstance(value, int):
+            return "%#x" % value
+        else:
+            return value
+
+    attributes = (
+        "_READLINE_VERSION",
+        "_READLINE_RUNTIME_VERSION",
+        "_READLINE_LIBRARY_VERSION",
+    )
+    copy_attributes(info_add, readline, 'readline.%s', attributes,
+                    formatter=format_attr)
+
+
+def collect_gdb(info_add):
+    import subprocess
+
+    try:
+        proc = subprocess.Popen(["gdb", "-nx", "--version"],
+                                stdout=subprocess.PIPE,
+                                stderr=subprocess.PIPE,
+                                universal_newlines=True)
+        version = proc.communicate()[0]
+    except OSError:
+        return
+
+    # Only keep the first line
+    version = version.splitlines()[0]
+    info_add('gdb_version', version)
+
+
+def collect_tkinter(info_add):
+    try:
+        import _tkinter
+    except ImportError:
+        pass
+    else:
+        attributes = ('TK_VERSION', 'TCL_VERSION')
+        copy_attributes(info_add, _tkinter, 'tkinter.%s', attributes)
+
+    try:
+        import tkinter
+    except ImportError:
+        pass
+    else:
+        tcl = tkinter.Tcl()
+        patchlevel = tcl.call('info', 'patchlevel')
+        info_add('tkinter.info_patchlevel', patchlevel)
+
+
+def collect_time(info_add):
+    import time
+
+    if not hasattr(time, 'get_clock_info'):
+        return
+
+    for clock in ('time', 'perf_counter'):
+        tinfo = time.get_clock_info(clock)
+        info_add('time.%s' % clock, str(tinfo))
+
+
+def collect_sysconfig(info_add):
+    import sysconfig
+
+    for name in (
+        'ABIFLAGS',
+        'ANDROID_API_LEVEL',
+        'CC',
+        'CCSHARED',
+        'CFLAGS',
+        'CFLAGSFORSHARED',
+        'PY_LDFLAGS',
+        'CONFIG_ARGS',
+        'HOST_GNU_TYPE',
+        'MACHDEP',
+        'MULTIARCH',
+        'OPT',
+        'PY_CFLAGS',
+        'PY_CFLAGS_NODIST',
+        'Py_DEBUG',
+        'Py_ENABLE_SHARED',
+        'SHELL',
+        'SOABI',
+        'prefix',
+    ):
+        value = sysconfig.get_config_var(name)
+        if name == 'ANDROID_API_LEVEL' and not value:
+            # skip ANDROID_API_LEVEL=0
+            continue
+        value = normalize_text(value)
+        info_add('sysconfig[%s]' % name, value)
+
+
+def collect_ssl(info_add):
+    try:
+        import ssl
+    except ImportError:
+        return
+
+    def format_attr(attr, value):
+        if attr.startswith('OP_'):
+            return '%#8x' % value
+        else:
+            # Convert OPENSSL_VERSION_INFO tuple to str
+            return str(value)
+
+    attributes = (
+        'OPENSSL_VERSION',
+        'OPENSSL_VERSION_INFO',
+        'HAS_SNI',
+        'OP_ALL',
+        'OP_NO_TLSv1_1',
+    )
+    copy_attributes(info_add, ssl, 'ssl.%s', attributes, formatter=format_attr)
+
+
+def collect_socket(info_add):
+    import socket
+
+    hostname = socket.gethostname()
+    info_add('socket.hostname', hostname)
+
+
+def collect_sqlite(info_add):
+    try:
+        import sqlite3
+    except ImportError:
+        return
+
+    attributes = ('version', 'sqlite_version')
+    copy_attributes(info_add, sqlite3, 'sqlite3.%s', attributes)
+
+
+def collect_zlib(info_add):
+    try:
+        import zlib
+    except ImportError:
+        return
+
+    attributes = ('ZLIB_VERSION', 'ZLIB_RUNTIME_VERSION')
+    copy_attributes(info_add, zlib, 'zlib.%s', attributes)
+
+
+def collect_info(info):
+    error = False
+    info_add = info.add
+
+    for collect_func in (
+        # collect_os() should be the first, to check the getrandom() status
+        collect_os,
+
+        collect_gdb,
+        collect_locale,
+        collect_platform,
+        collect_readline,
+        collect_socket,
+        collect_sqlite,
+        collect_ssl,
+        collect_sys,
+        collect_sysconfig,
+        collect_time,
+        collect_tkinter,
+        collect_zlib,
+    ):
+        try:
+            collect_func(info_add)
+        except Exception as exc:
+            error = True
+            print("ERROR: %s() failed" % (collect_func.__name__),
+                  file=sys.stderr)
+            traceback.print_exc(file=sys.stderr)
+            print(file=sys.stderr)
+            sys.stderr.flush()
+
+    return error
+
+
+def dump_info(info, file=None):
+    title = "Python debug information"
+    print(title)
+    print("=" * len(title))
+    print()
+
+    infos = info.get_infos()
+    infos = sorted(infos.items())
+    for key, value in infos:
+        value = value.replace("\n", " ")
+        print("%s: %s" % (key, value))
+    print()
+
+
+def main():
+    info = PythonInfo()
+    error = collect_info(info)
+    dump_info(info)
+
+    if error:
+        print("Collection failed: exit with error", file=sys.stderr)
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    main()