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From: "suzuki DOT masaomi AT fujitsu DOT com" <suzuki DOT masaomi AT fujitsu DOT com>
To: "'cygwin AT cygwin DOT com'" <cygwin AT cygwin DOT com>
Subject: scp command fails to transfer file and returns 1.
Thread-Topic: scp command fails to transfer file and returns 1.
Thread-Index: AdiWi62jVeXnF3ElTvSG79UO+L3cGg==
Date: Wed, 13 Jul 2022 07:41:25 +0000
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$B!!!!(BWindows API$B$N(BCreateProcess()$B$r0J2<$NMM$K;HMQ$7!";R%W%m%;%9$r<B9T$7$^$9!#(B

 $B!!(BCreateProcess(NULL, 
        fullPathCmd,$B!!!!(B/* ssh,scp$B$N(Bcommond line                     */
        NULL,           /* process security attributes              */
        NULL,           /* primary thread security attributes       */
        TRUE,           /* handles are inherited                    */
        NORMAL_PRIORITY_CLASS|CREATE_NO_WINDOW,  /* creation flags  */
        NULL,           /* use parent's environment                 */
        NULL,           /* use parent's current directory           */
        &si,            /* STARTUPINFO pointer                      */
        &pi);           /* receives PROCESS_INFORMATION             */

$B!!!&(Bssh$B%3%^%s%I$r<B9T$9$k;~$N%3%^%s%I%i%$%s(B
$B!!!!>e5-$K<($7$?(BCreateProcess()$B$NBh#2%Q%i%a%?(BfullPathCmd$B$r!"0J2<$NMM$K(B
$B!!!!;XDj$7$F$$$^$9!#(B

$B!!!!(B<Cygwin$B$N%$%s%9%H!<%k%G%#%l%/%H%j(B>\bin\ssh.exe -q -l root -p 22 $B%[%9%HL>(B "echo aaa && /bin/sh -c \"/bin/uname -n\""

$B!!!&(Bscp$B%3%^%s%I$r<B9T$9$k;~$N%3%^%s%I%i%$%s(B
$B!!!!>e5-$K<($7$?(BCreateProcess()$B$NBh#2%Q%i%a%?(BfullPathCmd$B$r!"0J2<$NMM$K(B
$B!!!!;XDj$7$F$$$^$9!#(B
$B!!!!(B
$B!!!!(B<Cygwin$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""


$B0J>e!"$h$m$7$/$*4j$$$7$^$9!#(B


$B0J9_$O1QLuJ8>O$G$9!#(B
******************************************************************
Cygwin Support Dear Representatives

Thank you for your support.
I am Shen Ting.

We ask for your cooperation in solving the following problem.

$B"#(BEnvironment
  OS: Windows Server 2019
$B!!(BCygwin Version : 3.3.5

$B"#(BBackground of the problem
In our application program, for the purpose of SSH communication and file transfer to a remote system (OS: Linux), 
the ssh and scp commands included in Cygwin are executed as child processes.
(*) For details of the demonstration contents, refer to "$B"#(BOur Application Program"
(*)As a preliminary preparation, we set the SSH public key and 
   confirm that we can connect to SSH without inquiring about the password.

$B"#(BThe problem
In the OS, after installing the latest version (3.3.5) of Cygwin downloaded from the URL(https://www.cygwin.com/), 
when we execute our application program, the scp command returns "1" every time, and the file transfer fails.

As a result of debugging our application program, the scp command returned the following message.

$B!!(B/usr/bin/scp: dest open ""/tmp/a"": No such file or directory
$B!!(B/usr/bin/scp: failed to upload file /cygdrive//C/test/a to "/tmp/a"

$B"#(BProblem supplement
$B!&(BIf the scp command is executed directly from the command prompt or Cygwin Bash Shell
  instead of being executed from our application program as a child process, 
  "0" will be returned and the file transfer will succeed.

$B!&(BIf we execute our application program after introducing the old version Cygwin(3.2.0) to the same OS, 
  the scp command will return "0" and the file transfer will be successful.

From the above, we speculate that there may be some incompatibility in the operating specifications of 
the scp command in the latest version Cygwin(3.3.5) and the old version Cygwin(3.2.0).

$B"#(BRequests
  Are there any possible causes and workarounds for the above problem?

  <Respondents>
   soft-mpop-qqm AT ml DOT css DOT fujitsu DOT com

$B"#(BOur Application Program
$B!&(BHow child processes run
  Use the Windows API CreateProcess() as follows to execute the child process.

 $B!!(BCreateProcess(NULL, 
        fullPathCmd,$B!!!!(B/* ssh,scp$B$N(Bcommond line                    */
        NULL,           /* process security attributes              */
        NULL,           /* primary thread security attributes       */
        TRUE,           /* handles are inherited                    */
        NORMAL_PRIORITY_CLASS|CREATE_NO_WINDOW,  /* creation flags  */
        NULL,           /* use parent's environment                 */
        NULL,           /* use parent's current directory           */
        &si,            /* STARTUPINFO pointer                      */
        &pi);           /* receives PROCESS_INFORMATION             */

$B!&(BCommand line when executing ssh command
  The second parameter of CreateProcess() shown above, fullPathCmd, is specified as follows.
 
   <Cygwin Installation Directory>\bin\ssh.exe -q -l root -p 22 $B%[%9%HL>(B "echo aaa && /bin/sh -c \"/bin/uname -n\""

$B!&(BCommand line when executing scp command
  The second parameter of CreateProcess() shown above, fullPathCmd, is specified as follows.
 
   <Cygwin Installation Directory>\bin\scp.exe "/cygdrive//C/test/a" "root"@$B%[%9%HL>(B:""/tmp/a""

******************************************************************

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