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From: "suzuki DOT masaomi AT fujitsu DOT com" <suzuki DOT masaomi AT fujitsu DOT com>
To: "'Takashi Yano'" <takashi DOT yano AT nifty DOT ne DOT jp>,
        "'cygwin AT cygwin DOT com'"
 <cygwin AT cygwin DOT com>
Subject: RE: [soft-mpop-qqm:27201] Re: scp command fails to transfer file and
 returns 1.
Thread-Topic: [soft-mpop-qqm:27201] Re: scp command fails to transfer file and
 returns 1.
Thread-Index: AdiWi62jVeXnF3ElTvSG79UO+L3cGgCkhg4AAH68LPAAA3yOgAABN0kAACuV83A=
Date: Wed, 20 Jul 2022 01:42:30 +0000
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Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

Cygwin Support Dear Representatives

Thank you very much for your reply.

>This seems to be behaviour change betweeen OpenSSH 8.x and 9.0.

You are right.

Referring to the URL below, the problem is caused by the change in the protocol 
used by the scp command by default in the latest OpenSSH (9.0p1-1).

https://www.openssh.com/releasenotes.html#9.0p1
---------------------------------
This release switches scp(1) from using the legacy scp/rcp protocol
to using the SFTP protocol by default.

Legacy scp/rcp performs wildcard expansion of remote filenames (e.g.
"scp host:* .") through the remote shell. This has the side effect of
requiring double quoting of shell meta-characters in file names
included on scp(1) command-lines, otherwise they could be interpreted
as shell commands on the remote side.

This creates one area of potential incompatibility: scp(1) when using
the SFTP protocol no longer requires this finicky and brittle quoting,
and attempts to use it may cause transfers to fail. We consider the
removal of the need for double-quoting shell characters in file names
to be a benefit and do not intend to introduce bug-compatibility for
legacy scp/rcp in scp(1) when using the SFTP protocol.

Another area of potential incompatibility relates to the use of remote
paths relative to other user's home directories, for example -
"scp host:~user/file /tmp". The SFTP protocol has no native way to
expand a ~user path. However, sftp-server(8) in OpenSSH 8.7 and later
support a protocol extension "expand-path AT openssh DOT com" to support
this.

In case of incompatibility, the scp(1) client may be instructed to use
the legacy scp/rcp using the -O flag.($B!z(B)
---------------------------------

According to the above instructions(the $B!z(B part), in the OpenSSH(9.0p1-1),
when runing the scp commond with -O option, the old protocol(legacy scp/rcp) will be used.

Therefore, I runed the scp command wit the -O option and it was successful.
---------------------------------
C:\Users\Administrator>C:\cygwin64\bin\scp.exe -O "/cygdrive//C/test/a" "root"@RJEL74JP:"\"/tmp/a\""
a                                                               100%   36KB   1.3MB/s   00:00

>echo %errorlevel%
0
---------------------------------

Previously, in the old version Cygwin(3.2.0) that we downloaded from the URL (https://www.cygwin.com/), 
the version of OpenSSH is 8.4p1-1, so on our Windows that the Cygwin(3.2.0) was installed,
the following scp command can be successful.
---------------------------------
<Cygwin Installation Directory>\bin\scp.exe "/cygdrive//C/test/a" "root"@$B%[%9%HL>(B:"\"/tmp/a\""
---------------------------------

The problem is not related to the version of Cygwin, I'm sorry to have troubled you.


$B0J9_$OF|K\8l$NJ8>O$G$9!#(B
******************************************************************
Cygwin$B%5%]!<%H(B $B$4C4EvMM(B

$B$46(NO!"$I$&$b$"$j$,$H$&$4$6$$$^$7$?!#(B

>This seems to be behaviour change betweeen OpenSSH 8.x and 9.0.

$B$4G'<1$N$H$*$j$G$9!#(B

$B2<5-$N(BURL$B$r;2>H$7$?$H$3$m!":#2s$N8=>]$O!":G?7$N(BOpenSSH(9.0p1-1)$B$K$*$$$F!"(B
scp$B%3%^%s%I$,%G%U%)%k%H$G;HMQ$7$F$$$k%W%m%H%3%k$NJQ99$K5/0x$7$F$$$k$3$H$,$o$+$j$^$7$?!#(B

https://www.openssh.com/releasenotes.html#9.0p1
---------------------------------
This release switches scp(1) from using the legacy scp/rcp protocol
to using the SFTP protocol by default.

Legacy scp/rcp performs wildcard expansion of remote filenames (e.g.
"scp host:* .") through the remote shell. This has the side effect of
requiring double quoting of shell meta-characters in file names
included on scp(1) command-lines, otherwise they could be interpreted
as shell commands on the remote side.

This creates one area of potential incompatibility: scp(1) when using
the SFTP protocol no longer requires this finicky and brittle quoting,
and attempts to use it may cause transfers to fail. We consider the
removal of the need for double-quoting shell characters in file names
to be a benefit and do not intend to introduce bug-compatibility for
legacy scp/rcp in scp(1) when using the SFTP protocol.

Another area of potential incompatibility relates to the use of remote
paths relative to other user's home directories, for example -
"scp host:~user/file /tmp". The SFTP protocol has no native way to
expand a ~user path. However, sftp-server(8) in OpenSSH 8.7 and later
support a protocol extension "expand-path AT openssh DOT com" to support
this.

In case of incompatibility, the scp(1) client may be instructed to use
the legacy scp/rcp using the -O flag.($B!z(B)
---------------------------------

$B>e5-$N!z2U=j$N AT bL@$K$h$j!"(BOpenSSH(9.0p1-1)$B$G$O!"(B
-O$B%*%W%7%g%s$r;XDj$9$k(Bscp$B%3%^%s%I$r<B9T$7$?>l9g!"8E$$%W%m%H%3%k(B(scp/rcp)$B$,(B
$B;HMQ$5$l$F!":#2s$N(Bscp$B%3%^%s%I$,@5>o$K9T$o$l$k$H9M$($i$l$^$9!#(B

$B$^$?!"<B5!$G(B-O$B%*%W%7%g%s$r;XDj$9$k(Bscp$B%3%^%s%I$r<B9T$7$?$H$3$m!"(B
$B AT 5>o$K9T$o$l$F$$$k$3$H$r3NG'$7$^$7$?!#(B
---------------------------------
C:\Users\Administrator>C:\cygwin64\bin\scp.exe -O "/cygdrive//C/test/a" "root"@RJEL74JP:"\"/tmp/a\""
a                                                               100%   36KB   1.3MB/s   00:00

>echo %errorlevel%
0
---------------------------------
$B"((BCygwin Bash Shell$B$K$b AT 5>o$K9T$o$l$F$$$^$9!#(B

$B2a5n$K!"EvJ}$,(BURL(https://www.cygwin.com/)$B$+$i%@%&%s%m!<%I$7$?(B
$B5l%P!<%8%g%s(B(3.2.0)$B$N(BCygwin$B$K$*$$$F!";HMQ$7$F$$$k(BOpenSSH$B$N%P!<%8%g%s$,(B8.4p1-1 $B$J$N$G!"(B
$B3:Ev(BCygwin$B$,F3F~$7$?(BWinodws$B$K$F!"2<5-$N(Bscp$B%3%^%s%I$,@5>o$K9T$o$l$F$$$^$9!#(B
---------------------------------
<Cygwin$B$N%$%s%9%H!<%k%G%#%l%/%H%j(B>\bin\scp.exe "/cygdrive//C/test/a" "root"@$B%[%9%HL>(B:"\"/tmp/a\""
---------------------------------

$B:#2s$N8=>]$O!"(BCygwin$B$N%P!<%8%g%s$H4X78$7$F$$$J$$$?$a!"(B
$B$4LBOG$r$*$+$1$F!"?=$7Lu$4$6$$$^$;$s!#(B
******************************************************************

> -----Original Message-----
> From: Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
> Sent: Tuesday, July 19, 2022 1:54 PM
> To: 'cygwin AT cygwin DOT com' <cygwin AT cygwin DOT com>
> Cc: Suzuki, Masaomi/$BNkLZ(B $B>-?C(B <suzuki DOT masaomi AT fujitsu DOT com>;
> 'soft-mpop-qqm AT ml DOT css DOT fujitsu DOT com' <soft-mpop-qqm AT ml DOT css DOT fujitsu DOT com>
> Subject: Re: [soft-mpop-qqm:27201] Re: scp command fails to transfer file and
> returns 1.
> 
> On Tue, 19 Jul 2022 13:18:55 +0900
> Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp> wrote:
> 
> > On Tue, 19 Jul 2022 02:40:14 +0000
> > > Thank you very much for your reply.
> > >
> > > >it seems your application is calling scp with " around the arguments, so,
> scp try to copy "/tmp/a" instead of just /tmp/a.
> > >
> > > We analyzed our application again, internally, calling scp command is as
> follows.
> > >
> > > $B!!(B<Cygwin$B$N%$%s%9%H!<%k%G%#%l%/%H%j(B>\bin\scp.exe
> "/cygdrive//C/test/a" "root"@$B%[%9%HL>(B:"\"/tmp/a\""
> > >
> > > The scp command above runs successfully with the old version
> > > Cygwin(3.2.0), but not with the the latest version Cygwin(3.3.5).
> > >
> > > <result of execution on command prompt>
> > > =============================================
> > > $B!|(Bthe old version Cygwin(3.2.0)
> > > ---------------------------------
> > > C:\Users\Administrator>C:\cygwin64\bin\scp.exe
> "/cygdrive//C/test/a" "root"@RJEL74JP:"\"/tmp/a\""
> > > a                                                               100%
> 36KB   1.3MB/s   00:00
> > >
> > > >echo %errorlevel%
> > > 0
> > > ---------------------------------
> > > $B!!"*(BSuccessfully.
> >
> > In my environment, your test case also fails with cygwin 3.2.0.
> >
> > C:\Users\yano>\cygwin64\bin\uname -a
> > CYGWIN_NT-10.0-19044 HP-Z230 3.2.0-340.x86_64 2021-03-29 08:42 UTC
> > x86_64 Cygwin
> >
> > C:\Users\yano>\cygwin64\bin\scp "/home/yano/a"
> "yano"@server:"\"/tmp/a\""
> > /usr/bin/scp: dest open ""/tmp/a"": No such file or directory
> > /usr/bin/scp: failed to upload file /tmp/a to "/tmp/a"
> >
> > The behaviour difference seems not due to cygwin version.
> 
> This seems to be behaviour change betweeen OpenSSH 8.x and 9.0.
> 
> --
> Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

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