tahoe-lafs/src/allmydata/_auto_deps.py

# Note: do not import any module from Tahoe-LAFS itself in this
# file. Also please avoid importing modules from other packages than
# the Python Standard Library if at all possible (exception: we rely
# on importing pkg_resources, which is provided by setuptools,
# zetuptoolz, distribute, and perhaps in the future distutils2, for
# the require_auto_deps() function.)

install_requires=[
                  # we require newer versions of setuptools (actually
                  # zetuptoolz) to build, but can handle older versions to run
                  "setuptools >= 0.6c6",

                  "zfec >= 1.1.0",

                  # Feisty has simplejson 1.4
                  "simplejson >= 1.4",

                  "zope.interface",
                  "Twisted >= 2.4.0",

                  # foolscap < 0.5.1 had a performance bug which spent
                  # O(N**2) CPU for 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[secure_connections] >= 0.6.1",
                  "Nevow >= 0.6.0",

                  # Needed for SFTP. pyasn1 is needed by twisted.conch in Twisted >= 9.0.
                  # pycrypto 2.2 doesn't work due to https://bugs.launchpad.net/pycrypto/+bug/620253
                  "pycrypto == 2.0.1, == 2.1, >= 2.3",
                  "pyasn1 >= 0.0.8a",

                  # http://www.voidspace.org.uk/python/mock/
                  "mock",

                  # Will be needed to test web apps, but not yet. See #1001.
                  #"windmill >= 1.3",
                  ]

import platform
if platform.machine().lower() in ['i386', 'x86_64', 'amd64', 'x86', '']:
    # pycryptopp v0.5.20 fixes bugs in SHA-256 and AES on x86 or amd64
    # (from Crypto++ revisions 470, 471, 480, 492).  The '' is there
    # in case platform.machine is broken and this is actually an x86
    # or amd64 machine.
    install_requires.append("pycryptopp >= 0.5.20")
else:
    # pycryptopp v0.5.13 had a new bundled version of Crypto++
    # (v5.6.0) and a new bundled version of setuptools (although that
    # shouldn't make any different to users of pycryptopp).
    install_requires.append("pycryptopp >= 0.5.14")


# Sqlite comes built into Python >= 2.5, and is provided by the "pysqlite"
# distribution for Python 2.4.
import sys
if sys.version_info < (2, 5):
    # pysqlite v2.0.5 was shipped in Ubuntu 6.06 LTS "dapper" and Nexenta NCP 1.
    install_requires.append("pysqlite >= 2.0.5")

if hasattr(sys, 'frozen'): # for py2exe
    install_requires=[]
del sys # clean up namespace

def require_python_version():
    import sys, platform

    # we require 2.4.4 on non-UCS-2, non-Redhat builds to avoid <http://www.python.org/news/security/PSF-2006-001/>
    # we require 2.4.3 on non-UCS-2 Redhat, because 2.4.3 is common on Redhat-based distros and will have patched the above bug
    # we require at least 2.4.2 in any case to avoid a bug in the base64 module: <http://bugs.python.org/issue1171487>
    if sys.maxunicode == 65535:
        if sys.version_info < (2, 4, 2) or sys.version_info[0] > 2:
            raise NotImplementedError("Tahoe-LAFS current requires Python v2.4.2 or greater "
                                      "for a UCS-2 build (but less than v3), not %r" %
                                      (sys.version_info,))
    elif platform.platform().lower().find('redhat') >= 0:
        if sys.version_info < (2, 4, 3) or sys.version_info[0] > 2:
            raise NotImplementedError("Tahoe-LAFS current requires Python v2.4.3 or greater "
                                      "on Redhat-based distributions (but less than v3), not %r" %
                                      (sys.version_info,))
    else:
        if sys.version_info < (2, 4, 4) or sys.version_info[0] > 2:
            raise NotImplementedError("Tahoe-LAFS current requires Python v2.4.4 or greater "
                                      "for a non-UCS-2 build (but less than v3), not %r" %
                                      (sys.version_info,))

def require_auto_deps():
    """
    The purpose of this function is to raise a pkg_resources exception if any of the
    requirements can't be imported.  This is just to give earlier and more explicit error
    messages, as opposed to waiting until the source code tries to import some module from one
    of these packages and gets an ImportError.  This function gets called from
    src/allmydata/__init__.py .
    """
    require_python_version()

    import pkg_resources
    for requirement in install_requires:
        try:
            pkg_resources.require(requirement)
        except pkg_resources.DistributionNotFound:
            # there is no .egg-info present for this requirement, which
            # either means that it isn't installed, or it is installed in a
            # way that pkg_resources can't find it (but regular python
            # might).  There are several older Linux distributions which
            # provide our dependencies just fine, but they don't ship
            # .egg-info files. Note that if there *is* an .egg-info file,
            # but it shows a too-old version, then we'll get a
            # VersionConflict error instead of DistributionNotFound.
            pass