Exception ''<' not supported between instances of 'RPath' and 'RPath''

[Miroslav Geisselreiter]

Hi,

after upgrading rdiff-backup from 1.2.8 to 2.0 on CentOS 7 I have this 
error:

Previous backup seems to have failed, regressing destination now.
Exception ''<' not supported between instances of 'RPath' and 'RPath'' raised of 
class '<class 'TypeError'>':
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/Main.py", line 390, in 
error_check_Main
    Main(arglist)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/Main.py", line 412, in 
Main
    take_action(rps)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/Main.py", line 348, in 
take_action
    Backup(rps[0], rps[1])
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/Main.py", line 428, in 
Backup
    backup_final_init(rpout)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/Main.py", line 618, in 
backup_final_init
    checkdest_if_necessary(rpout)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/Main.py", line 1127, in 
checkdest_if_necessary
    dest_rp.conn.regress.Regress(dest_rp)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/regress.py", line 70, 
in Regress
    for rf in iterate_meta_rfs(mirror_rp, inc_rpath):
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/regress.py", line 214, 
in iterate_meta_rfs
    collated = rorpiter.Collate2Iters(raw_rfs, yield_metadata())
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/regress.py", line 198, 
in yield_metadata
    metadata_iter = metadata.ManagerObj.GetAtTime(regress_time)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/metadata.py", line 611, 
in GetAtTime
    cur_iter = self.get_meta_at_time(time, restrict_index)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/metadata.py", line 770, 
in get_meta_at_time
    for rp in self.relevant_meta_incs(time)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/metadata.py", line 780, 
in relevant_meta_incs
    inclist = self.sorted_prefix_inclist(b'mirror_metadata', min_time=time)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/metadata.py", line 729, 
in sorted_prefix_inclist
    sortlist.sort()

Traceback (most recent call last):
  File "/bin/rdiff-backup", line 32, in <module>
    rdiff_backup.Main.error_check_Main(sys.argv[1:])
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/Main.py", line 390, in 
error_check_Main
    Main(arglist)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/Main.py", line 412, in 
Main
    take_action(rps)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/Main.py", line 348, in 
take_action
    Backup(rps[0], rps[1])
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/Main.py", line 428, in 
Backup
    backup_final_init(rpout)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/Main.py", line 618, in 
backup_final_init
    checkdest_if_necessary(rpout)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/Main.py", line 1127, in 
checkdest_if_necessary
    dest_rp.conn.regress.Regress(dest_rp)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/regress.py", line 70, 
in Regress
    for rf in iterate_meta_rfs(mirror_rp, inc_rpath):
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/regress.py", line 214, 
in iterate_meta_rfs
    collated = rorpiter.Collate2Iters(raw_rfs, yield_metadata())
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/regress.py", line 198, 
in yield_metadata
    metadata_iter = metadata.ManagerObj.GetAtTime(regress_time)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/metadata.py", line 611, 
in GetAtTime
    cur_iter = self.get_meta_at_time(time, restrict_index)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/metadata.py", line 770, 
in get_meta_at_time
    for rp in self.relevant_meta_incs(time)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/metadata.py", line 780, 
in relevant_meta_incs
    inclist = self.sorted_prefix_inclist(b'mirror_metadata', min_time=time)
  File "/usr/lib64/python3.6/site-packages/rdiff_backup/metadata.py", line 729, 
in sorted_prefix_inclist
    sortlist.sort()
TypeError: '<' not supported between instances of 'RPath' and 'RPath'

----

This is fatal because rdiff-backup has ended without any action.

I use command:
rdiff-backup --preserve-numerical-ids --print-statistics /home/ 
/backup/home/
Source is 164569M large, target is 587348M

Now I run backup to new destination /backup/home2 for some time - it 
looks it will do backup without error.

Merac