Add an informative __main__.py (#620)

* Add an informative __main__.py

Give users an easy way to figure out what versions they're running.

* Why not more info!

* Add test

* No empty last line

* Make @alex happy

* DIAF Python 2.6

* Add cffi's version

* Make debug a module

* Add cryptography's compile-time OpenSSL

1 files changed, 42 insertions, 0 deletions

diff --git a/src/OpenSSL/debug.py b/src/OpenSSL/debug.py
new file mode 100644
index 0000000..0d37bf5
--- /dev/null
+++ b/src/OpenSSL/debug.py
@@ -0,0 +1,42 @@
+from __future__ import print_function
+
+import ssl
+import sys
+
+import OpenSSL.SSL
+import cffi
+import cryptography
+
+from . import version
+
+
+_env_info = u"""\
+pyOpenSSL: {pyopenssl}
+cryptography: {cryptography}
+cffi: {cffi}
+cryptography's compiled against OpenSSL: {crypto_openssl_compile}
+cryptography's linked OpenSSL: {crypto_openssl_link}
+Pythons's OpenSSL: {python_openssl}
+Python executable: {python}
+Python version: {python_version}
+Platform: {platform}
+sys.path: {sys_path}""".format(
+    pyopenssl=version.__version__,
+    crypto_openssl_compile=OpenSSL._util.ffi.string(
+        OpenSSL._util.lib.OPENSSL_VERSION_TEXT,
+    ).decode("ascii"),
+    crypto_openssl_link=OpenSSL.SSL.SSLeay_version(
+        OpenSSL.SSL.SSLEAY_VERSION
+    ).decode("ascii"),
+    python_openssl=getattr(ssl, "OPENSSL_VERSION", "n/a"),
+    cryptography=cryptography.__version__,
+    cffi=cffi.__version__,
+    python=sys.executable,
+    python_version=sys.version,
+    platform=sys.platform,
+    sys_path=sys.path,
+)
+
+
+if __name__ == "__main__":
+    print(_env_info)