[Duplicity-tracker] [bug #21689] FTP backend mishandles absolute paths

[Darik Horn]

Follow-up Comment #2, bug #21689 (project duplicity):

I'm getting the desired behavior with Duplicity Patch #21689.

The gotcha here is that the ncftp helpers can get parameters with mixmatched
quoting.  For example, the ncftpls helper does not unquote the MKD parameter,
but it does unquote the URI parameter, and both of these strings are coming
from the same ParsedUrl properties.

I'm testing against Netkit 0.17 and ProFTPD 1.3.1rc2 at DreamHost.  I can't
get the logs for these servers, but I'll sandbox a similar configuration if
this bug still needs motivation after you review the patch.

Note that all URIs for FTP resources are path relative.  In particular,
ftp://MyServer//MyPath is not absolute, but some FTP implementations will do
what you want instead of what you asked.

How does your FileZilla installation currently handle these equivalent URIs?

  ftp://MyServer/%2F/MyPath/
  ftp://MyServer//%2F/MyPath/
  ftp://MyServer/%2MyPath

I tried to be minimally invasive with the patch, but I needed to touch the
os.path.join statement to keep it small.

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