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From: "suzuki.masaomi@fujitsu.com" <suzuki.masaomi@fujitsu.com>
To: "'cygwin@cygwin.com'" <cygwin@cygwin.com>
Subject: scp command fails to transfer file and returns 1.
Thread-Topic: scp command fails to transfer file and returns 1.
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Date: Wed, 13 Jul 2022 07:41:25 +0000
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Cygwinサポート ご担当様

お世話になっております。
沈　テイです。

下記の問題の解決について、ご協力をお願いします。

■環境
  OS: Windows Server 2019
　Cygwinバージョン: 3.3.5

■問題が起きた背景
　当方のアプリケーションプログラムでは、リモートシステム(OS: Linux)へ
　SSH通信やファイル転送を行う目的で、Cygwinに含まれるssh, scpコマンドを
　子プロセスとして実行する実装にしています。
　※実証内容の詳細は、"■当方のアプリケーションプログラム"を参照
　※事前準備として、SSH公開鍵を設定し、パスワードの問い合わせ無しで
　　SSH接続できることを確認しています。

■問題の内容
　URL(https://www.cygwin.com/)からダウンロードした最新バージョン(3.3.5)の
　CygwinをOSに導入した後、当方のアプリケーションプログラムを実行すると、
　scpコマンドは毎回、戻り値"1"で復帰し、ファイル転送が失敗します。

　当方のアプリケーションプログラムをデバックした結果、
　scpコマンドは下記のメッセージを返却していました。

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

■問題の補足
　・scpコマンドを、当方のアプリケーションプログラムから子プロセスとして
　　実行するのではなく、コマンドプロンプトやCygwin Bash Shellから直接的に
　　実行した場合は、戻り値"0"で復帰し、ファイル転送は成功します。

　・旧バージョン(3.2.0)のCygwinを同じOSに導入した後、
　　当方のアプリケーションプログラムを実行した場合は、scpコマンドは
　　戻り値"0"で復帰し、ファイル転送は成功します。

　以上のことから、我々は、最新バージョン(3.3.5)と旧バージョン(3.2.0)の
　Cygwinで、scpコマンドの動作仕様に何らかの非互換があるのではないか、と
　推測しています。

■依頼事項
　上記の問題に対して、考えられる原因および対処方法はありますか？

  ＜回答先＞
　　soft-mpop-qqm@ml.css.fujitsu.com

■当方のアプリケーションプログラム
　・子プロセスの実行方法
　　Windows APIのCreateProcess()を以下の様に使用し、子プロセスを実行します。

 　CreateProcess(NULL, 
        fullPathCmd,　　/* ssh,scpのcommond 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             */

　・sshコマンドを実行する時のコマンドライン
　　上記に示したCreateProcess()の第２パラメタfullPathCmdを、以下の様に
　　指定しています。

　　<Cygwinのインストールディレクトリ>\bin\ssh.exe -q -l root -p 22 ホスト名 "echo aaa && /bin/sh -c \"/bin/uname -n\""

　・scpコマンドを実行する時のコマンドライン
　　上記に示したCreateProcess()の第２パラメタfullPathCmdを、以下の様に
　　指定しています。
　　
　　<Cygwinのインストールディレクトリ>\bin\scp.exe "/cygdrive//C/test/a" "root"@ホスト名:""/tmp/a""


以上、よろしくお願いします。


以降は英訳文章です。
******************************************************************
Cygwin Support Dear Representatives

Thank you for your support.
I am Shen Ting.

We ask for your cooperation in solving the following problem.

■Environment
  OS: Windows Server 2019
　Cygwin Version : 3.3.5

■Background 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 "■Our 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.

■The 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.

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

■Problem supplement
・If 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.

・If 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).

■Requests
  Are there any possible causes and workarounds for the above problem?

  <Respondents>
   soft-mpop-qqm@ml.css.fujitsu.com

■Our Application Program
・How child processes run
  Use the Windows API CreateProcess() as follows to execute the child process.

 　CreateProcess(NULL, 
        fullPathCmd,　　/* ssh,scpのcommond 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             */

・Command 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 ホスト名 "echo aaa && /bin/sh -c \"/bin/uname -n\""

・Command 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"@ホスト名:""/tmp/a""

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

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