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createmodule.py
#!/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)
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