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Improve comments in _auto_deps.py. refs #2249, #2028, #2193, #2005, #1258

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Signed-off-by: Daira Hopwood <daira@jacaranda.org>
This commit is contained in:
Daira Hopwood 2014-10-07 21:04:40 +01:00
parent 3ff7f9bea3
commit b0b76a7c5b
1 changed files with 34 additions and 18 deletions
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52
src/allmydata/_auto_deps.py
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@ -22,18 +22,7 @@ install_requires = [
# transferring large mutable files of size N.
# * foolscap < 0.6 is incompatible with Twisted 10.2.0.
# * foolscap 0.6.1 quiets a DeprecationWarning.
# * foolscap < 0.6.3 is incompatible with Twisted-11.1.0 and newer. Since
# current Twisted is 12.0, any build which needs twisted will grab a
# version that requires foolscap>=0.6.3
# * pyOpenSSL is required by foolscap for it (foolscap) to provide secure
# connections. Foolscap doesn't reliably declare this dependency in a
# machine-readable way, so we need to declare a dependency on pyOpenSSL
# ourselves. Tahoe-LAFS doesn't *really* depend directly on pyOpenSSL,
# so if something changes in the relationship between foolscap and
# pyOpenSSL, such as foolscap requiring a specific version of
# pyOpenSSL, or foolscap switching from pyOpenSSL to a different crypto
# library, we need to update this declaration here.
#
# * foolscap < 0.6.3 is incompatible with Twisted 11.1.0 and newer.
"foolscap >= 0.6.3",
# Needed for SFTP.
@ -95,6 +84,11 @@ import sys
if not hasattr(sys, 'frozen'):
package_imports.append(('setuptools', 'setuptools'))
# Splitting the dependencies for Windows and non-Windows helps to fix
# <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2249> and
# <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2028>.
if sys.platform == "win32":
install_requires += [
# * On Windows we need at least Twisted 9.0 to avoid an indirect
@ -149,10 +143,32 @@ else:
('pyasn1-modules', 'pyasn1_modules'),
]
# If pyOpenSSL >= 0.14 is *already* installed, then accept it, otherwise
# require pyOpenSSL 0.13 or 0.13.1.
# See <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1246#comment:6> for why
# we don't rely on pkg_resources to tell us the installed pyOpenSSL version number.
# * pyOpenSSL is required in order for foolscap to provide secure connections.
# Since foolscap doesn't reliably declare this dependency in a machine-readable
# way, we need to declare a dependency on pyOpenSSL ourselves. Tahoe-LAFS does
# not *directly* depend on pyOpenSSL.
#
# * pyOpenSSL >= 0.13 is needed in order to avoid
# <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2005>.
#
# * pyOpenSSL >= 0.14 is built on the 'cryptography' package which depends
# on 'cffi' (and indirectly several other packages). Unfortunately cffi
# attempts to compile code dynamically, which causes problems on many systems.
# It also depends on the libffi OS package which may not be installed.
# <https://bitbucket.org/cffi/cffi/issue/109/enable-sane-packaging-for-cffi>
# <https://bitbucket.org/cffi/cffi/issue/70/cant-install-cffi-using-pip-on-windows>
#
# So, if pyOpenSSL 0.14 has *already* been installed and is importable, we
# want to accept it; otherwise we ask for pyOpenSSL 0.13 or 0.13.1.
# <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2193>
#
# We don't rely on pkg_resources to tell us the installed pyOpenSSL version
# number, because pkg_resources telling us that we have 0.14 is not sufficient
# evidence that 0.14 will be the imported version (or will work correctly).
# One possible reason why it might not be is explained in
# <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1246#comment:6> and
# <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1258>.
_can_use_pyOpenSSL_0_14 = False
try:
@ -165,8 +181,8 @@ except Exception:
if _can_use_pyOpenSSL_0_14:
install_requires += [
# pyOpenSSL >= 0.13 is needed in order to fix
# <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2005>.
# Although we checked for pyOpenSSL >= 0.14 above, we only actually
# need pyOpenSSL >= 0.13; requiring 0.14 here cannot help.
"pyOpenSSL >= 0.13",
# ... and now all the new stuff that pyOpenSSL 0.14 transitively