[Duplicity-talk] Why doesn't the scp backend work properly to localhost?

[Philip Tuckey]

I'm having some trouble doing what I want with duplicity, and I found that
problems arise if one uses the scp backend to backup to localhost. This is
not what I really want to do, I know I could use file:// for that, but it
looks like the same problem I'm meeting and is simpler to demonstrate.

If one uses the scp backend to backup to localhost, then
--list-current-files doesn't work, --verify doesn't work (-v9 shows that
all files are considered to be new) and backups are always effectively
full, even though duplicity sees the preceding backups (presumably since
all files are considered to be new). This is presumably all the same
problem.

I would appreciate it if someone can see how to fix this, or even just
confirm the same behaviour. (Why should localhost be special as an scp/ssh
backup host?)

I'm using the Debian 0.4.1-8 version of duplicity on a Debian "testing"
system.

Thanks


Here is an example (these are consecutive commands, the directory being
backed up doesn't change):

joey> duplicity /home/pat/dir scp://localhost/backup
No signatures found, switching to full backup.
tmplSqS2z                                     100%  190KB 189.6KB/s   00:00
tmpKuTib6                                     100%  170     0.2KB/s   00:00
tmpVOvt5t                                     100%   17KB  17.1KB/s   00:00
--------------[ Backup Statistics ]--------------
StartTime 1097362338.57 (Sun Oct 10 00:52:18 2004)
EndTime 1097362338.85 (Sun Oct 10 00:52:18 2004)
ElapsedTime 0.28 (0.28 seconds)
SourceFiles 50
SourceFileSize 775178 (757 KB)
NewFiles 50
NewFileSize 775178 (757 KB)
DeletedFiles 0
ChangedFiles 0
ChangedFileSize 0 (0 bytes)
ChangedDeltaSize 0 (0 bytes)
DeltaEntries 50
RawDeltaSize 726026 (709 KB)
TotalDestinationSizeChange 194341 (190 KB)
Errors 0
-------------------------------------------------

joey> duplicity --list-current-files scp://localhost/backup
duplicity-full-signatures.2004-10-10T00:52:18 100%   17KB  17.1KB/s   00:00

joey> duplicity --verify scp://localhost/backup /home/pat/dir
duplicity-full.2004-10-10T00:52:18+02:00.mani 100%  170     0.2KB/s   00:00
Verify complete: 50 files compared, 50 differences found.

joey> duplicity /home/pat/dir scp://localhost/backup
duplicity-full.2004-10-10T00:52:18+02:00.mani 100%  170     0.2KB/s   00:00
duplicity-full-signatures.2004-10-10T00:52:18 100%   17KB  17.1KB/s   00:00
tmprqGJoj                                     100%  190KB 189.6KB/s   00:00
tmptLQYBR                                     100%  170     0.2KB/s   00:00
tmpcL-utX                                     100%   17KB  17.1KB/s   00:00
--------------[ Backup Statistics ]--------------
StartTime 1097363570.47 (Sun Oct 10 01:12:50 2004)
EndTime 1097363570.73 (Sun Oct 10 01:12:50 2004)
ElapsedTime 0.27 (0.27 seconds)
SourceFiles 50
SourceFileSize 775178 (757 KB)
NewFiles 50
NewFileSize 775178 (757 KB)
DeletedFiles 0
ChangedFiles 0
ChangedFileSize 0 (0 bytes)
ChangedDeltaSize 0 (0 bytes)
DeltaEntries 50
RawDeltaSize 726026 (709 KB)
TotalDestinationSizeChange 194337 (190 KB)
Errors 0
-------------------------------------------------

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