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s4-python: allow us to have samba copies of python libraries we depend on
For python libraries like dns.resolver it is useful to be able to install a copy of the library with Samba. This set of functions allows us to do that while using the locally installed version if it is available Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
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source4/scripting/python/samba/external.py
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50
source4/scripting/python/samba/external.py
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#!/usr/bin/python
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# Unix SMB/CIFS implementation.
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# Copyright (C) Andrew Tridgell 2010
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import sys, os
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def samba_find_external(directory):
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'''insert into out module search path the path to an
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external library'''
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for p in sys.path:
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dir = os.path.join(p, directory)
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if os.path.isdir(dir):
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sys.path.insert(0, dir)
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return
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# finally try in the local directory, to handle in-tree testing
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dir = os.path.join("scripting/python", directory)
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if os.path.isdir(dir):
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sys.path.insert(0, dir)
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return
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print "Failed to find external python library %s" % directory
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raise
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def samba_external_dns_resolver():
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'''try and import the dns.resolver library, and if it fails
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then use a local copy from the external directory'''
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try:
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import dns.resolver as dns
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except:
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samba_find_external("samba_external/dnspython")
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import dns.resolver as dns
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return dns
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