Jenkins SSH 调查

man bash，看“Invocation”，关于交互式shell与非交互式shell的差别。还有登录shell与非登录shell的差别。

man ssh, 看到“If command is specified, it is executed on the remote host instead of a login shell.”

interactive login shell, or as a non-interactive shell with the --login option
     /etc/profile首先加载
     接着
     ~/.bash_profile, ~/.bash_login, and ~/.profile
     注意：是按顺序尝试，只加载遇到的第一个

When an interactive shell that is not a login shell is started
     /etc/bash.bashrc首先加载
     接着
     ~/.bashrc

/etc/bash.bashrc：
# System-wide .bashrc file for interactive bash(1) shells.

# To enable the settings / commands in this file for login shells as well,
# this file has to be sourced in /etc/profile.

/etc/profile:
# /etc/profile: system-wide .profile file for the Bourne shell (sh(1))
# and Bourne compatible shells (bash(1), ksh(1), ash(1), …).


实际上，为了避免代码重复，通常
.profile会source .bashrc
/etc/profile会source /etc/bash.bashrc


Login profile files

When the SSH slaves plugin connects to a slave, it does not run an interactive shell. Instead it does the equivalent of your running "ssh slavehost command..." a few times, eventually to run "ssh slavehost java -jar …".
Jenkins SSH Slave的登录：只会调用/etc/bash.bashrc和.bashrc，并且是non-interactive的。在原始的.bashrc的第一 句话，就return了。

http://www.joshstaiger.org/archives/2005/07/bash_profile_vs.html
Mac OS X 是例外：
An exception to the terminal window guidelines is Mac OS X’s Terminal.app, which runs a login shell by default for each new terminal window, calling .bash_profile instead of .bashrc. Other GUI terminal emulators may do the same, but most tend not to.

https://help.ubuntu.com/community/EnvironmentVariables
“
Note: Variable expansion does not work in /etc/environment.
”
这一句很重要，在/etc/environment里写 CLASSPATH=$CLASSPATH:xxxx:xxxxx，会导致Jenkins解析环境变量时死循环，就在于变量不展开。 

落款2014.02.26

CYGWIN搭建SSH服务

第一步：安装cygwin

第二步：运行D:\install\cygwin>Cygwin.bat

Copying skeleton files.
These files are for the users to personalise their cygwin experience.
They will never be overwritten nor automatically updated.
`./.bashrc' -> `/home/admin//.bashrc'
`./.bash_profile' -> `/home/admin//.bash_profile'
`./.inputrc' -> `/home/admin//.inputrc'
`./.profile' -> `/home/admin//.profile'

第三步：配置# ssh-host-config

第四步：启动SSHD服务

打开 控制面板-》管理-》服务 启动名为 CYGWIN sshd 的服务，亦可在cygwin中输入 cygrunsrv --start sshd 启动sshd， 输入cygrunsrv --stop sshd停止sshd

或者net start sshd /net stop sshd

第五步：验证SSHD服务

启动服务之后，通过从 bash 提示符输入以下信息测试服务：ssh localhost -l your_username。

如果通知您不能建立本地主机的可靠性，并询问您是否确定要继续连接？，请输入 yes。

当提示您本地主机上的帐户密码时，请输入您在登录计算机时使用的密码。

FAQ:

【问题】

Warning: They must match the regexp d..x..x..[xt] 

*** ERROR: Problem with /var directory. Exiting.

【解决】

builder@WIN-I5LS0DIFU1O /cygdrive/e/workdir/cygwin
# stat -c %A /var
drwx------

chmod 111 /var

【问题】cygrunsrv: Error starting a service: QueryServiceStatus:  Win32 error 1062:

【解决】重新ssh-host-config

*** Query: Should privilege separation be used? (yes/no) yes

将这一步的配置改为YES，然后创建SSHD服务。

【问题】Permission denied ,please try again.

【解决】

参考资料

http://docs.oracle.com/cd/E24628_01/install.121/e22624/preinstall_req_cygwin_ssh.htm