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#!/usr/bin/python
#
# createmodule.py - Takes the name of a environment init script and
# produces a modulefile that duplicates the changes made by the init script
#
# Copyright (C) 2012 by Orion E. Poplawski <orion@cora.nwra.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from optparse import OptionParser
import os,sys
from subprocess import *
# Handle options
usage = "Usage: %prog [-p prefix] <initscript> [args]"
parser = OptionParser()
parser.set_usage(usage)
parser.add_option('-p', '--prefix', dest='prefix', help='Specify path prefix')
(options, args) = parser.parse_args()
# Need a script name
if not args:
parser.print_usage()
exit(1)
# Return environment after a command
def getenv(cmd = ':'):
env = {}
p = Popen(cmd + ";env", shell=True, stdout=PIPE, stderr=PIPE)
(stdout, stderr) = p.communicate()
if p.returncode != 0:
print "EROR: Could not execute initscript:"
print "%s returned exit code %d" % (cmd, p.returncode)
print stderr
exit(1)
if stderr != '':
print "WARNING: initscript sent the following to stderr:"
print stderr
# Parse the output key=value pairs
for line in stdout.splitlines():
try:
(var,value) = line.split('=',1)
except ValueError:
print "ERROR: Could not parse output:"
print stdout
exit(1)
env[var] = value
return env
#Record initial environment
env1=getenv()
#Record environment after sourcing the initscript
env2=getenv(". " + " ".join(args))
# Initialize our variables for storing modifications
chdir = None
appendpath = {}
prependpath = {}
setenv = {}
unsetenv = []
pathnames = []
# Function to nomalize all paths in a list of paths and remove duplicate items
def normpaths(paths):
newpaths = []
for path in paths:
normpath = os.path.normpath(path)
if normpath not in newpaths:
newpaths.append(os.path.normpath(path))
return newpaths
# Start with existing keys and look for changes
for key in env1.keys():
# Test for delete
if key not in env2:
unsetenv.append(key)
continue
# No change
if env1[key] == env2[key]:
del env2[key]
continue
#Working directory change
if key == 'PWD':
chdir=os.path.normpath(env2[key])
pathnames.append(chdir)
del env2[key]
continue
# Determine modifcations to beginning and end of the string
(prepend,append) = env2[key].split(env1[key])
if prepend:
prependpaths = prepend.strip(':').split(':')
# LICENSE variables often include paths outside install directory
if 'LICENSE' not in key:
pathnames += prependpaths
prependpath[key] = ':'.join(normpaths(prependpaths))
if append:
appendpaths = append.strip(':').split(':')
# LICENSE variables often include paths outside install directory
if 'LICENSE' not in key:
pathnames += appendpaths
appendpath[key] = ':'.join(normpaths(appendpaths))
del env2[key]
# We're left with new keys in env2
for key in env2.keys():
# Use prepend-path for new paths
if ('PATH' in key) or (':' in env2[key]):
prependpaths = env2[key].strip(':').split(':')
# MANPATH can have system defaults added it it wasn't previously set
# LICENSE variables often include paths outside install directory
if key != 'MANPATH' and 'LICENSE' not in key:
pathnames += prependpaths
prependpath[key] = ':'.join(normpaths(prependpaths))
continue
# Set new variables
setenv[key] = os.path.normpath(env2[key])
if 'LICENSE' not in key:
pathnames.append(setenv[key])
# Determine a prefix
prefix = None
if options.prefix:
prefix = options.prefix
else:
prefix = os.path.commonprefix(pathnames).rstrip('/')
if prefix == '':
prefix = None
# Print out the modulefile
print "#%Module 1.0"
# Prefix
if prefix is not None:
print "\nset prefix " + prefix + "\n"
# Chdir
if chdir is not None:
print "chdir\t" + chdir
# Function to format output line with tabs and substituting prefix
def formatline(item, key, value=None):
print item,
print "\t"*(2-(len(item)+1)/8),
print key,
if value is not None:
print "\t"*(3-(len(key)+1)/8),
if prefix is not None:
print value.replace(prefix,'$prefix')
else:
print value
# Paths first, grouped by variable name
pathkeys = appendpath.keys() + prependpath.keys()
pathkeys.sort()
for key in pathkeys:
if key in prependpath:
formatline("prepend-path",key,prependpath[key])
if key in appendpath:
formatline("append-path",key,appendpath[key])
# Setenv
setenvkeys = setenv.keys()
setenvkeys.sort()
if setenvkeys:
print
for key in setenvkeys:
formatline("setenv",key,setenv[key])
# Unsetenv
unsetenv.sort()
if unsetenv:
print
for key in unsetenv:
formatline("unsetenv",key)
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