Re: [rdiff-backup-users] Restore from a read-only mounted source

[Wolfgang Dautermann]

Ben Escoto wrote:
> Hmm, this should work 

Yes would be fine. Even in the manpage one can read "Note that you 
should not write to the mirror directory except with rdiff-backup." - 
and mounting the backup-space read-only would help to ensure that...

> What errors are you getting? 

/mnt is mounted read-only, in /mnt/home-daute is my backup:

If I want to see, which backups are available:

$ rdiff-backup -V
rdiff-backup 1.0.4

$ rdiff-backup --list-increments /mnt/home-daute
Traceback (most recent call last):
  File "/usr/local/bin/rdiff-backup", line 23, in ?
    rdiff_backup.Main.Main(sys.argv[1:])
  File "/usr/lib/python2.3/site-packages/rdiff_backup/Main.py", line 
285, in Main
    take_action(rps)
  File "/usr/lib/python2.3/site-packages/rdiff_backup/Main.py", line 
261, in take_action
    elif action == "list-increments": ListIncrements(rps[0])
  File "/usr/lib/python2.3/site-packages/rdiff_backup/Main.py", line 
680, in ListIncrements
    rp = require_root_set(rp)
  File "/usr/lib/python2.3/site-packages/rdiff_backup/Main.py", line 
700, in require_root_set
    single_set_fs_globals(Globals.rbdir)
  File "/usr/lib/python2.3/site-packages/rdiff_backup/Main.py", line 
722, in single_set_fs_globals
    rbdir, 1, Globals.chars_to_quote)
  File "/usr/lib/python2.3/site-packages/rdiff_backup/fs_abilities.py", 
line 408, in get_fsabilities_readwrite
    return FSAbilities(desc_string).init_readwrite(
  File "/usr/lib/python2.3/site-packages/rdiff_backup/fs_abilities.py", 
line 145, in init_readwrite
    subdir.mkdir()
  File "/usr/lib/python2.3/site-packages/rdiff_backup/rpath.py", line 
796, in mkdir
    self.conn.os.mkdir(self.path)
OSError: [Errno 30] Read-only file system: 
'/mnt/home-daute/rdiff-backup-data/rdiff-backup.tmp.0'



If I want to see, which Files were available yesterday:


$ rdiff-backup --list-at-time 2006-01-22 /mnt/home-daute/public_html/
Traceback (most recent call last):
  File "/usr/local/bin/rdiff-backup", line 23, in ?
    rdiff_backup.Main.Main(sys.argv[1:])
  File "/usr/lib/python2.3/site-packages/rdiff_backup/Main.py", line 
285, in Main
    take_action(rps)
  File "/usr/lib/python2.3/site-packages/rdiff_backup/Main.py", line 
259, in take_action
    elif action == "list-at-time": ListAtTime(rps[0])
  File "/usr/lib/python2.3/site-packages/rdiff_backup/Main.py", line 
815, in ListAtTime
    rp = require_root_set(rp)
  File "/usr/lib/python2.3/site-packages/rdiff_backup/Main.py", line 
700, in require_root_set
    single_set_fs_globals(Globals.rbdir)
  File "/usr/lib/python2.3/site-packages/rdiff_backup/Main.py", line 
722, in single_set_fs_globals
    rbdir, 1, Globals.chars_to_quote)
  File "/usr/lib/python2.3/site-packages/rdiff_backup/fs_abilities.py", 
line 408, in get_fsabilities_readwrite
    return FSAbilities(desc_string).init_readwrite(
  File "/usr/lib/python2.3/site-packages/rdiff_backup/fs_abilities.py", 
line 145, in init_readwrite
    subdir.mkdir()
  File "/usr/lib/python2.3/site-packages/rdiff_backup/rpath.py", line 
796, in mkdir
    self.conn.os.mkdir(self.path)
OSError: [Errno 30] Read-only file system: 
'/mnt/home-daute/rdiff-backup-data/rdiff-backup.tmp.0'

> The logfile error was fixed so
> rdiff-backup would continue without logging if it couldn't write a log. 
> (At least that is my recollection.)

Hmm... Right. It gives a warning, but you are correct, the file is restored:

$ rdiff-backup -r 2006-01-22 /mnt/home-daute/test.txt /tmp/test.txt
Warning - Unable to open logfile: Unable to open logfile 
/mnt/home-daute/rdiff-backup-data/restore.log: [Errno 30] Read-only file 
system: '/mnt/home-daute/rdiff-backup-data/restore.log'

Bye, Wolfgang

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Automotive Engineering & Railway Engineering
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