openssh bugs - Nov 2024 - [Bug 3750] New: With scp's switch from SCP to SFTP, streaming output no longer works

https://bugzilla.mindrot.org/show_bug.cgi?id=3750

            Bug ID: 3750
           Summary: With scp's switch from SCP to SFTP, streaming output
                    no longer works
           Product: Portable OpenSSH
           Version: 9.9p1
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: scp
          Assignee: unassigned-bugs at mindrot.org
          Reporter: jeff at jefftk.com

After upgrading OpenSSH, running "scp user at host:file /dev/stdout"
now
gives:

    ftruncate "/dev/stdout": Invalid argument
    Couldn't write to "/dev/stdout": Illegal seek

I think this is due to the switch from the SCP to SFTP protocol: when I
use the -O switch to restore the older behavior it works again.

Streaming output is quite valuable to me: I often want to run commands
like:

    scp remote:very-large-file /dec/stdout | aws s3 cp -
s3://bucket/dest

where the file is larger than my local disk or memory.

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https://bugzilla.mindrot.org/show_bug.cgi?id=3750

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |djm at mindrot.org

--- Comment #1 from Damien Miller <djm at mindrot.org> ---
I don't think this is possible to fix without considerable work.

As a workaround "ssh remote cat very-large-file | aws s3 cp -
s3://bucket/dest" should do the same thing with fewer steps

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