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#!/usr/libexec/platform-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 __future__ import print_function
from optparse import OptionParser
import os,sys,re
from subprocess import *
import platform
# Handle options
usage = "Usage: %prog [-p prefix] <initscript> [args]"
parser = OptionParser()
parser.set_usage(usage)
parser.add_option('-p', '--prefix', action='store', type='string', dest='prefix', help='Specify path prefix')
parser.add_option('--noprefix', action='store_true', dest='noprefix', default=False, help='Do not generate a prefix')
(options, args) = parser.parse_args()
# Need a script name
if not args:
parser.print_usage()
exit(1)
# Determine if running environment is based on cmd.exe or not
def iscmdshell():
return True if platform.system() == 'Windows' else False
# Return environment after a command
def getenv(cmd = ':'):
env = {}
if iscmdshell():
# ':' command not supported by cmd.exe
cmd = (cmd if cmd != ':' else '@echo off') + " >nul & set"
else:
cmd = cmd + " >/dev/null;env"
p = Popen(cmd, shell=True, stdout=PIPE, stderr=PIPE, universal_newlines=True)
(stdout, stderr) = p.communicate()
if p.returncode != 0:
print("ERROR: 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
skip = False
for line in stdout.splitlines():
if skip:
if line == '}':
skip = False
continue
elif iscmdshell() and line.find('=') == -1:
continue
try:
(var,value) = line.split('=',1)
except ValueError:
print("ERROR: Could not parse output line:")
print(line)
exit(1)
# Exported functions - not handled
if value.find('() {') == 0:
skip = True
else:
env[var] = value
return env
#Record initial environment
env1=getenv()
#Record environment after sourcing the initscript
if iscmdshell():
if len(args)>1:
env2=getenv('"' + args[0] + '" ' + " ".join(args[1:]))
else:
env2=getenv('"' + args[0] + '"')
else:
env2=getenv(". " + " ".join(args))
# Initialize our variables for storing modifications
chdir = None
appendpath = {}
prependpath = {}
unhandled = {}
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 and normpath != '.':
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
try:
(prepend,append) = env2[key].split(env1[key])
except ValueError:
continue
if prepend:
presep = prepend[-1:]
prependpaths = prepend.strip(presep).split(presep)
# LICENSE variables often include paths outside install directory
if 'LICENSE' not in key:
pathnames += prependpaths
if presep not in prependpath:
prependpath[presep] = {}
newpath = presep.join(normpaths(prependpaths))
if newpath:
prependpath[presep][key] = newpath
else:
unhandled[key] = env2[key]
if append:
appsep = append[0:1]
appendpaths = append.strip(appsep).split(appsep)
# LICENSE variables often include paths outside install directory
if 'LICENSE' not in key:
pathnames += appendpaths
if appsep not in appendpath:
appendpath[appsep] = {}
newpath = appsep.join(normpaths(appendpaths))
if newpath:
appendpath[appsep][key] = newpath
else:
unhandled[key] = env2[key]
del env2[key]
# We're left with new keys in env2
for key in env2.keys():
# Use prepend-path for new paths
if (re.search('(DIRS|FILES|PATH)$',key)) or (':' in env2[key]):
prependpaths = env2[key].strip(':').split(':')
# MANPATH can have system defaults added it it wasn't previously set
# LICENSE variables often include paths outside install directory
if key != 'MANPATH' and 'LICENSE' not in key:
pathnames += prependpaths
if ':' not in prependpath:
prependpath[':'] = {}
prependpath[':'][key] = ':'.join(normpaths(prependpaths))
continue
# Set new variables
setenv[key] = os.path.normpath(env2[key])
if 'LICENSE' not in key:
pathnames.append(setenv[key])
# Report unhandled keys
for key in unhandled.keys():
print("Unhandled change of", key, file=sys.stderr)
print("Before <%s>" % env1[key], file=sys.stderr)
print("After <%s>" % unhandled[key], file=sys.stderr)
for sepkey in appendpath.keys():
appendpath[sepkey].pop(key, None)
for sepkey in prependpath.keys():
prependpath[sepkey].pop(key, None)
# Determine a prefix
prefix=None
if options.prefix:
prefix = options.prefix
elif not options.noprefix:
prefix = os.path.commonprefix(pathnames).rstrip('/')
if prefix == '':
prefix = None
# Print out the modulefile
print("#%Module 1.0")
# Prefix
if prefix is not None:
print("\nset prefix " + prefix + "\n")
# Chdir
if chdir is not None:
print("chdir\t" + chdir)
# Function to format output line with tabs and substituting prefix
def formatline(item, key, value=None):
print(item, end=' ')
print("\t"*(2-(len(item)+1)//8), end=' ')
print(key, end=' ')
if value is not None:
print("\t"*(3-(len(key)+1)//8), end=' ')
if prefix is not None:
# Prefer usage of regular expression to perform a none
# case-sensitive substitution (cygwin vs cmd.exe)
if iscmdshell():
print(re.sub('(?i)' + re.escape(prefix), '$prefix', value))
else:
print(value.replace(prefix,'$prefix'))
else:
print(value)
# Paths first, grouped by variable name
for sepkey in prependpath.keys():
pathkeys = list(prependpath[sepkey].keys())
pathkeys.sort()
for key in pathkeys:
if sepkey == ":":
formatline("prepend-path",key,prependpath[sepkey][key])
else:
formatline("prepend-path --delim %s" % sepkey,key,prependpath[sepkey][key])
for sepkey in appendpath.keys():
pathkeys = list(appendpath[sepkey].keys())
pathkeys.sort()
for key in pathkeys:
if sepkey == ":":
formatline("append-path",key,appendpath[sepkey][key])
else:
formatline("append-path --delim %s" % sepkey,key,appendpath[sepkey][key])
# Setenv
setenvkeys = list(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)