Apologies, the correct gist URL is
https://gist.github.com/ian-kent/bc378dccb8948785dda4
On 2016-01-27 13:29:27 +0000, Ian Kent said:
--001a113a6d208f957c052a50ca4d
Content-Type: text/plain; charset=UTF-8
Hi
I've been trying to implement an SCP server with an in-memory FileSystem,
so files can be transferred directly into the receiving application over
SSH (rather than disk-polling).
An example of my implementation is
https://gist.github.com/ian-kent/75bcb2197d757e584e10
This initially works ok, and the first file I transfer using scp works and
its contents printed to the console. However, any subsequent requests
(whether thats multiple files in one scp command, or multiple scp commands)
fail with an scp error of "lost connection".
I've run scp with -vvvv flags, and SSHD with its logging set to TRACE. When
the transfer fails (i.e. all subsequent requests), the output from both scp
and SSHD report everything as being ok, other than the final "lost
connection" error on the client. The only difference is that the actual
file content doesn't get transferred, but I couldn't see anything which
suggests why that doesn't happen.
This seems to be related to using an in-memory file system. If I comment
out lines 55 - 60 on the sample code, so SSHD defaults to using a real file
system, everything works reliably as expected, which suggests its probably
not directly a Mina/SSHD bug.
I've tried multiple in-memory file systems including
google/JimFS, marschall/memoryfilesystem and openCage/memoryfs (all on
GitHub), and all of them suffer from the same problem.
Is there something I might have missed, e.g. a FileSystem feature not
implemented by any of those in-memory implementations, or does anyone have
any ideas why this might not be working?
Thanks
Ian Kent
--001a113a6d208f957c052a50ca4d--
