Am 10.09.2010 um 08:34 schrieb Daniel Stenberg:
> On Fri, 10 Sep 2010, Uli Zappe wrote:
>
>> So, the only explanation seems to be that while "T1111111111 0 1111111111 0"
>> is indeed sent, it's somehow "misformatted" so that it doesn't achieve the
>> intended effect. Unfortunately, I dont' know anything about the ssh/scp
>> protocol, so I cannot judge that.
>
> None of us knew the protocol until we looked it up and learned it. Try:
>
> http://blogs.sun.com/janp/entry/how_the_scp_protocol_works
Thanks for the link, very nice!
> To me it seems the times are sent correctly...
Well, interestingly the linked article describes several scenarios, but notably
exactly what is the issue at hand is missing: preserving the modification time
when you copy a file *to* the remote side. (Copying *from* the remote host
preserves the time just fine for me in the examples of the article, and in
libssh2, too.)
Now, of course you would think that the time preserving examples of the linked
article would work as well the other way round, i.e. doing something like
$ scp -pt /tmp
$ T1183832947 0 1183833773 0
$ C0644 6 test
$ [content]
However, this does *not* work; it doesn't affect the modification time at all
(I also tried scp -p -t without success, just to make sure). Since this seems
to be exactly what libssh2 does, it's no wonder that this doesn't work, either.
In contrast, using (OpenSSH's) scp in a "regular" way (scp -p source target)
works just fine. So there are two obvious questions:
1. What is it (at least on Mac OS X) that OpenSSH at the remote end expects
that the above usage (scp -pt /tmp ...) does not deliver, but the "regular" use
of scp (scp -p source target) does?
2. Is this a peculiarity of Mac OS X's version of OpenSSH? I very much doubt
it, but it would be good to cross-check with OpenSSH on Linux & Co, to make
sure it is as basic a problem as it seems to be.
Bye
Uli
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