openssh bugs - Dec 2024 - [Bug 3767] New: scp doesn't report copy of zero-length files to stdout when copying from remote server

https://bugzilla.mindrot.org/show_bug.cgi?id=3767

            Bug ID: 3767
           Summary: scp doesn't report copy of zero-length files to stdout
                    when copying from remote server
           Product: Portable OpenSSH
           Version: 9.7p1
          Hardware: amd64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: scp
          Assignee: unassigned-bugs at mindrot.org
          Reporter: openssh_bugs at caseyconnor.org

I know scp uses sftp now, so I'm not sure if this is a bug: note that
when copying a zero-length file, scp doesn't report anything to stdout
when the file is coming from a remote server. See the following --
there are four transfers, but only three generate any stdout; the
second is silent:

$ touch /tmp/file.txt
$ scp /tmp/file.txt myserver:~/.
file.txt                                                            
100%    0     0.0KB/s   00:00
$ scp myserver:~/file.txt /tmp/file.txt
$ echo "hello" > /tmp/file.txt
$ scp /tmp/file.txt myserver:~/.
file.txt                                                            
100%    6     1.6KB/s   00:00
$ scp myserver:~/file.txt /tmp/file.txt
file.txt                                                            
100%    6     0.8KB/s   00:00
$

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openssh_bugs at caseyconnor.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |openssh_bugs at caseyconnor.or
                   |                            |g

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https://bugzilla.mindrot.org/show_bug.cgi?id=3767

--- Comment #1 from openssh_bugs at caseyconnor.org ---
Kubuntu 24.10 is the distrubution.

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https://bugzilla.mindrot.org/show_bug.cgi?id=3767

--- Comment #2 from openssh_bugs at caseyconnor.org ---
Seems to be intentional, at least by code, given these lines:

https://github.com/openssh/openssh-portable/blob/826483d51a9fee60703298bbf839d9ce37943474/sftp-client.c#L1684

https://github.com/openssh/openssh-portable/blob/826483d51a9fee60703298bbf839d9ce37943474/sftp-client.c#L2115

...but what would be the reason if it is an intentional design choice?

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