#!/usr/bin/env python
#
# This file is part of the Coriolis Software.
# Copyright (c) UPMC/LIP6 2015-2018, All Rights Reserved
#
# +-----------------------------------------------------------------+ 
# |                   C O R I O L I S                               |
# |     C o r i o l i s  -  Generic Program Launcher                |
# |                                                                 |
# |  Author      :                    Jean-Paul CHAPUT              |
# |  E-mail      :            Jean-Paul.Chaput@lip6.fr              |
# | =============================================================== |
# |  Python      :  "./src/coriolis.py"                             |
# +-----------------------------------------------------------------+


import sys
import os.path
import optparse
import subprocess
import distutils.sysconfig


class Location ( object ):
  SetCoriolisTop    = 0x0001
  SetLdLibraryPath  = 0x0002
  SetBasePythonPath = 0x0004
  BaseSysconfDir    = 0x0008
  BaseSystem        = SetCoriolisTop|BaseSysconfDir
  Devtoolset2       = SetCoriolisTop|BaseSysconfDir|SetBasePythonPath
  UserDefined       = SetCoriolisTop|SetLdLibraryPath|SetBasePythonPath


def truncPath ( path, ifirst, ilast ):
  rawDirectories = path.split('/')
  directories    = []
  for directory in rawDirectories:
    if len(directory): directories.append( directory )
  truncated = os.path.join( *directories[ifirst:ilast] )
  if ifirst == 0 and rawDirectories[0] == '':
    truncated = '/'+truncated
  return truncated


def uname ( arguments ):
  return subprocess.Popen( ["uname"] + arguments
                         , stdout=subprocess.PIPE ).stdout.readlines()[0][:-1]


class Pathes ( object ):

    def __init__ ( self, name ):
      self.name       = name
      self.components = []
      if os.environ.has_key(name):
        self.components = os.environ[name].split(':')
      return

    def asString ( self ):
      s = ''
      for i in range(len(self.components)):
        if s: s += ':'
        s += self.components[i]
      return s

    def export ( self ):
      os.environ[self.name] = self.asString()
      return

    def insert ( self, index, path ):
      self.components.insert( index, path )
      return

    def show ( self ):
      print '     %s:' % self.name
      for component in self.components:
        print '       %s' % component
      return


osType = uname( ['-s'] )
arch   = uname( ['-m'] )

libDir = '/lib'
if arch == 'x86_64' and os.path.exists('/usr/lib64'): libDir = '/lib64'

pythonSitePackages = os.path.join( *(distutils.sysconfig.get_python_lib(1).split('/')[-3:]) )

print '     ========================================'
print '     OS:\n       %s' % osType

scriptBinPath = os.path.abspath(os.path.dirname(sys.argv[0]))
print '     Script location:\n       %s' % scriptBinPath
if scriptBinPath == '/usr/bin':
  location    = Location.BaseSystem
  coriolisTop = '/usr'
  print '     Using standard system installation scheme.'
elif scriptBinPath == '/soc/coriolis2/bin':
  location    = Location.Devtoolset2
  coriolisTop = '/soc/coriolis2'
  print '     Using RHEL6 installation scheme.'
  ldLibraryPath = os.getenv('LD_LIBRARY_PATH')
  if not 'devtoolset' in ldLibraryPath:
    print '[ERROR] You must enable the devtoolset-2 before running Coriolis:'
    print '        > scl enable devtoolset-2 bash'
    sys.exit( 1 )
else:
  location    = Location.UserDefined
  coriolisTop = truncPath( scriptBinPath, 0, -1 ) 
  print '     Using User installation scheme.'

if location & Location.SetCoriolisTop:
  os.environ['CORIOLIS_TOP'] = coriolisTop
  print '     CORIOLIS_TOP:\n       %s' % coriolisTop

if location & Location.BaseSysconfDir:
  sysConfDir = truncPath( coriolisTop, 0, -1 ) + '/etc/coriolis2'
else:
  sysConfDir = coriolisTop + '/etc/coriolis2'
print '     Configuration directory:\n       %s' % sysConfDir

os.environ['STRATUS_MAPPING_NAME'] = sysConfDir+'/stratus2sxlib.xml'

binPath = Pathes( 'PATH' )
binPath.insert( 0, scriptBinPath )
binPath.export()
binPath.show()

ldLibraryPathName = 'LD_LIBRARY_PATH'
if osType == 'Darwin':
  ldLibraryPathName = 'DYLD_LIBRARY_PATH'

if location & Location.SetLdLibraryPath:
  ldLibraryPath = Pathes( ldLibraryPathName )
  ldLibraryPath.insert( 0, coriolisTop+libDir )
  ldLibraryPath.export()
  ldLibraryPath.show()

pythonPath = Pathes( 'PYTHONPATH' )
if location & Location.SetBasePythonPath:
  pythonPath.insert( 0, os.path.join(coriolisTop,pythonSitePackages) )
pythonPath.insert( 0, os.path.join(coriolisTop,pythonSitePackages,'crlcore') )
pythonPath.insert( 0, os.path.join(coriolisTop,pythonSitePackages,'stratus') )
pythonPath.insert( 0, os.path.join(coriolisTop,pythonSitePackages,'cumulus') )
pythonPath.insert( 0, os.path.join(coriolisTop,pythonSitePackages,'pharos' ) )
pythonPath.export()
pythonPath.show()


argvStart   = 0
slaveScript = 'cgt'
if len(sys.argv) > 1 and sys.argv[1].startswith('--run='):
  argvStart   = 1
  slaveScript = sys.argv[1][6:]

print '     Script:\n       %s' % slaveScript
print '     ========================================'

try:
  os.execvp( slaveScript, sys.argv[argvStart:] )
except Exception, e:
  print '[ERROR] An exception occured while lauching <%s>\n' % slaveScript
  print e
  sys.exit( 3 )

sys.exit( 0 )