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The data is stored in /var/cache/edb/mtimedb, which is in the python pickle format. Here is a simple script to list and edit the resume list:

 
#!/bin/env python 
 
# Script to edit portage resume list 
# Jordan Callicoat < MonkeeSage at gmail dot com > 
# public domain 

import os, sys, pickle, re 

if '-h' in sys.argv or '--help' in sys.argv: 
   sys.exit(''' 
   Script to edit portage resume list 

       -l              List items in resume list [default] 
       -d NUM          Delete item from list 
   ''') 

int_rexp = re.compile(r'd+') 

def packge_list(how='read', what=None): 
  try: 
    if how == 'read': 
      fhand = open('/var/cache/edb/mtimedb', 'rb') 
      data  = pickle.load(fhand) 
      fhand.close() 
      return data 
    else: 
      fhand = open('/var/cache/edb/mtimedb', 'wb') 
      pickle.dump(what, fhand) 
      fhand.close() 
      return True 
  except: 
    sys.exit() 

data = packge_list() 
if (not data.has_key('resume') or 
    len(data['resume']['mergelist']) == 0): 
  sys.exit('Nothing in resume list') 
elif '-l' in sys.argv or len(sys.argv) == 1: 
  counter = 1 
  print 'Items in resume list:' 
  for item in data['resume']['mergelist']: 
    print '    %d.) %s' % (counter, item[2]) 
    counter += 1 
elif '-d' in sys.argv: 
  index = sys.argv.index('-d') + 1 
  if len(sys.argv) == 2: 
    sys.exit('Error: -d option requires an argument') 
  elif not int_rexp.match(sys.argv[index]): 
    sys.exit('Error: -d option requires a numeric argument') 
  else: 
    index = int(sys.argv[index]) - 1 
    if len(data['resume']['mergelist']) >= index: 
      del data['resume']['mergelist'][index] 
      packge_list(how='write', what=data)
 

I also wrote a little script to make a resume "point." It just makes a copy of the file with the resume info so you can load that copy later. So you can emerge something else then resume the original merge later.

 
#!/bin/env python 

# Script to create/delete a portage resume point 
# Jordan Callicoat < MonkeeSage at gmail dot com > 
# public domain 

import os, sys, shutil 

real_path = '/var/cache/edb/mtimedb' 
back_path = '%s.resume' % real_path 

if '-h' in sys.argv or '--help' in sys.argv: 
   sys.exit(''' 
   Script to create/delete a portage resume point 

       -r, --resume    Resumes from last point 
       -d, --delete    Deletes resume point 
       [default]       Creates resume point 
   ''') 
elif '-d' in sys.argv or '--delete' in sys.argv: 
  try: 
    os.unlink(back_path) 
  except: 
    pass 
  print "Removed `%s'" % back_path 
else: 
  if '-r' in sys.argv or '--resume' in sys.argv: 
    shutil.copy(back_path, real_path) 
    os.system('emerge --resume') 
  else: 
    shutil.copy(real_path, back_path) 
    print "Created `%s'" % back_path