Bug 626

Summary:

sftp is unable to resume interrupted downloads/ uploads

Product:

Portable OpenSSH

Reporter:

Hussam <hqasem>

Component:

sftp

Assignee:

OpenSSH Bugzilla mailing list <openssh-bugs>

Status:

CLOSED FIXED

Severity:

enhancement

CC:

cjwatson, djm

Priority:

Keywords:

low-hanging-fruit

Version:

3.6.1p2

Hardware:

All

OS:

All

Bug Depends on:

Bug Blocks:

2076

Attachments:

Description	Flags
Implement truncation at "high water mark" on error	none

Description Hussam 2003-08-12 14:12:37 AEST

This is not a bug, but an enhancement. I would like to see the command-line sftp
have the ability to resume interrupted downloads/ uploads.

If there's a reason why sftp-resume will not be implemented, a FAQ entry would
be appreciated.

Comment 1 Damien Miller 2003-08-25 10:28:31 AEST

resume would be a nice feature for sftp and the protocol generally supports it.
It just takes someone to write the code and make a patch (I don't have time).

There may be some subtlety if the server reorders the blocks it has sent back to
the client when the original transfer was aborted. E.g. the client requests 5
contiguous blocks of 64k from the start of the file and the server sends back
blocks 1, 2, and 5. If the client wrote block 5 to disk, the the file would
appear to be the full length but wouldn't contain all the data.

We would need to modify the download and upload routines to ftruncate() at the
highest contiguous point transferred. This should probably be done anyway...

Comment 2 Damien Miller 2005-04-21 16:33:15 AEST

Created attachment 889 [details]
Implement truncation at "high water mark" on error

This patch does the clean truncation part. It is only useful for downloads.

Comment 3 Colin Watson 2013-09-15 08:22:41 AEST

Isn't this fixed in 6.3?

 * sftp(1): add support for resuming partial downloads using the "reget"
   command and on the sftp commandline or on the "get" commandline using
   the "-a" (append) option.

Comment 4 Damien Miller 2015-11-13 14:20:22 AEDT

Yes, resumption is implemented for both get and put now.

Comment 5 Damien Miller 2016-08-02 10:40:40 AEST

Close all resolved bugs after 7.3p1 release