安装Haraka时遇到的错误gyp ERR! stack Error: spawn ENOENT的解决方案
由于win7的IIS中没有自带smtp服务，调试邮件发送程序时十分不变，找到一个free smtp server，还限制每天只能发送10封邮件。刚好在学习nodejs，所以在想nodejs上应该有开源的smtp邮件服务器，果然有很多，其中一个是Haraka，代码托管在github上，https://github.com/baudehlo/Haraka
安装Haraka很简单，使用npm即可，如下：
$npm install Haraka
但是中间报错了：
D:\nodejs\node_modules\Haraka\node_modules\node-syslog>node "D:\nodejs\node_modules\npm\bin\node-gyp-bin\\..\..\node_modules\node-gyp\bin\node-gyp.js" rebuild gyp ERR! configure error gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable. gyp ERR! stack at failNoPython (D:\nodejs\node_modules\npm\node_modules\node-gyp\lib\configure.js:120:14) gyp ERR! stack at D:\nodejs\node_modules\npm\node_modules\node-gyp\lib\configure.js:83:11 gyp ERR! stack at Object.oncomplete (fs.js:107:15) gyp ERR! System Windows_NT 6.1.7601 gyp ERR! command "node" "D:\\nodejs\\node_modules\\npm\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild" gyp ERR! cwd D:\nodejs\node_modules\Haraka\node_modules\node-syslog gyp ERR! node -v v0.10.22 gyp ERR! node-gyp -v v0.11.0 gyp ERR! not ok根据提示应该是没有安装python，google了一下，大家建议安装python2.7，所以就下载安装了python2.7，设置环境变量PYTHON为D:\Python27（安装目录）。重新执行npm，结果如下，还是报错：
D:\nodejs\node_modules\Haraka\node_modules\node-syslog>node "D:\nodejs\node_modules\npm\bin\node-gyp-bin\\..\..\node_modules\node-gyp\bin\node-gyp.js" rebuild gyp ERR! configure error gyp ERR! stack Error: spawn ENOENT gyp ERR! stack at errnoException (child_process.js:980:11) gyp ERR! stack at Process.ChildProcess._handle.onexit (child_process.js:771:34) gyp ERR! System Windows_NT 6.1.7601 gyp ERR! command "node" "D:\\nodejs\\node_modules\\npm\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild" gyp ERR! cwd D:\nodejs\node_modules\Haraka\node_modules\node-syslog gyp ERR! node -v v0.10.22 gyp ERR! node-gyp -v v0.11.0 gyp ERR! not ok不过这次的错误不一样了，报的错误是spawn ENOENT，说明安装的Python和PYTHON这个环境变量还是有作用，但是为什么还是报错了，再次google一下，发现很多同学安装node-gyp时都报错了，最后还是在github上找到了答案，原来需要设置的环境变量PYTHON设错了，需要设置成可执行程序文件，而不是目录，如下：
PYTHONPATH=D:\Python27 PYTHON=%PYTHONPATH%\python.exe设置了之后重新开终端执行npm，结果如下，还是有错误：
gyp ERR! build error gyp ERR! stack Error: `C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe` failed with exit code: 1 gyp ERR! stack at ChildProcess.onExit (D:\nodejs\node_modules\npm\node_modules\node-gyp\lib\build.js:267:23) gyp ERR! stack at ChildProcess.EventEmitter.emit (events.js:98:17) gyp ERR! stack at Process.ChildProcess._handle.onexit (child_process.js:789:12) gyp ERR! System Windows_NT 6.1.7601 gyp ERR! command "node" "D:\\nodejs\\node_modules\\npm\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild" gyp ERR! cwd D:\nodejs\node_modules\Haraka\node_modules\node-syslog gyp ERR! node -v v0.10.22 gyp ERR! node-gyp -v v0.11.0 gyp ERR! not ok但是这次安装过程执行完了，最后并没有报错：
[email protected] node_modules\Haraka ├── [email protected] ├── [email protected] ├── [email protected] ├── [email protected] ├── [email protected] ├── [email protected] ├── [email protected] ([email protected]) ├── [email protected] └── [email protected] ([email protected], [email protected], [email protected], [email protected],[email protected], [email protected], [email protected])看来应该是安装成功了，看看能不能执行：
D:\nodejs>haraka -i d:\haraka D:\nodejs>haraka -c d:\haraka loglevel: LOGPROTOCOL Starting up Haraka version 2.2.8 [INFO] [-] [core] Loading plugins [INFO] [-] [core] Loading plugin: dnsbl [INFO] [-] [core] loaded TLD files: 1=310 2=3854 3=161 [DEBUG] [-] [core] registered hook connect to dnsbl.hook_connect [INFO] [-] [core] Loading plugin: data.rfc5322_header_checks [DEBUG] [-] [core] registered hook data_post to data.rfc5322_header_checks.hook_data_post [INFO] [-] [core] Loading plugin: helo.checks [DEBUG] [-] [core] registered hook helo to helo.checks.helo_no_dot [DEBUG] [-] [core] registered hook ehlo to helo.checks.helo_no_dot [DEBUG] [-] [core] registered hook helo to helo.checks.helo_match_re [DEBUG] [-] [core] registered hook ehlo to helo.checks.helo_match_re [DEBUG] [-] [core] registered hook helo to helo.checks.helo_raw_ip [DEBUG] [-] [core] registered hook ehlo to helo.checks.helo_raw_ip [DEBUG] [-] [core] registered hook helo to helo.checks.helo_is_dynamic [DEBUG] [-] [core] registered hook ehlo to helo.checks.helo_is_dynamic [DEBUG] [-] [core] registered hook helo to helo.checks.helo_big_company [DEBUG] [-] [core] registered hook ehlo to helo.checks.helo_big_company [DEBUG] [-] [core] registered hook helo to helo.checks.helo_literal_mismatch [DEBUG] [-] [core] registered hook ehlo to helo.checks.helo_literal_mismatch [INFO] [-] [core] Loading plugin: mail_from.access [DEBUG] [-] [core] registered hook mail to mail_from.access.mail_from_access [INFO] [-] [core] Loading plugin: mail_from.is_resolvable [DEBUG] [-] [core] plugin mail_from.is_resolvable set timeout to: 0s [DEBUG] [-] [core] registered hook mail to mail_from.is_resolvable.hook_mail [INFO] [-] [core] Loading plugin: max_unrecognized_commands [DEBUG] [-] [core] registered hook connect to max_unrecognized_commands.hook_connect [DEBUG] [-] [core] registered hook unrecognized_command to max_unrecognized_commands.hook_unrecognized_command [INFO] [-] [core] Loading plugin: rcpt_to.access [DEBUG] [-] [core] registered hook rcpt to rcpt_to.access.rcpt_to_access [INFO] [-] [core] Loading plugin: rcpt_to.in_host_list [DEBUG] [-] [core] registered hook rcpt to rcpt_to.in_host_list.hook_rcpt [INFO] [-] [core] Loading plugin: queue/smtp_forward [DEBUG] [-] [core] registered hook queue to queue/smtp_forward.hook_queue [DEBUG] [-] [core] registered hook queue_outbound to queue/smtp_forward.hook_queue_outbound [NOTICE] [-] [core] Listening on :::25 [DEBUG] [-] [core] [server] running init_master hooks [DEBUG] [-] [core] [outbound] Creating queue directory d:\haraka\queue [INFO] [-] [core] [outbound] Loading outbound queue from d:\haraka\queue好像并没有报错，hoho！
总结：Python在安装nodejs模块的过程中很重要，很多模块需要用到python，而且大多数要求是2.7版本的，安装完python之后记得设置三个环境变量：
1，PATH后面增加Python的安装目录
2，增加PYTHONPATH=Python的安装目录
3，增加PYTHON=%PYTHONPATH%\python.exe
注，设置环境变量之后需要重新启动终端才生效，在终端中查看环境变量可以使用set命令。
参考：
https://github.com/TooTallNate/node-gyp/issues/277