当尝试在 Openshift 上构建需要 Node-gyp 的模块（如 Node-canvas）时，我收到此错误：
> [email protected] /cdn-cgi/l/email-protection install /var/lib/.../repo/node_modules/canvas
> node-gyp rebuild
Traceback (most recent call last):
File "/opt/rh/v8314/root/usr/bin/gyp", line 15, in <module>
import gyp
ImportError: No module named gyp
gyp ERR! configure error
gyp ERR! stack Error: `gyp` failed with exit code: 1
gyp ERR! stack at ChildProcess.onCpExit (/opt/rh/nodejs010/root/usr/lib/node_modules/node-gyp/lib/configure.js:343:16)
gyp ERR! stack at ChildProcess.emit (events.js:98:17)
gyp ERR! stack at Process.ChildProcess._handle.onexit (child_process.js:820:12)
gyp ERR! System Linux 2.6.32-504.16.2.el6.x86_64
gyp ERR! command "node" "/opt/rh/nodejs010/root/usr/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /var/lib/.../repo/node_modules/canvas
gyp ERR! node -v v0.10.35
gyp ERR! node-gyp -v v1.0.2
gyp ERR! not ok
npm ERR! [email protected] /cdn-cgi/l/email-protection install: `node-gyp rebuild`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] /cdn-cgi/l/email-protection install script.
npm ERR! This is most likely a problem with the canvas package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node-gyp rebuild
npm ERR! You can get their info via:
npm ERR! npm owner ls canvas
npm ERR! There is likely additional logging output above.
npm ERR! System Linux 2.6.32-504.16.2.el6.x86_64
npm ERR! command "node" "/opt/rh/nodejs010/root/usr/bin/npm" "install" "node-canvas-1.2.3"
npm ERR! cwd /var/lib/.../app-root/runtime/repo
npm ERR! node -v v0.10.35
npm ERR! npm -v 1.4.28
npm ERR! code ELIFECYCLE
npm ERR! not ok code 0
我的理解是node-gyp正在导入未找到的gyp python模块。几周前，我通过将 PYTHONPATH 环境变量设置为 node_modules 目录（/var/lib/.../repo/node_modules/node-gyp/gyp/pylib）中的 gyp python 模块解决了这个问题。这样构建就成功完成了，我可以使用节点画布模块。现在我怀疑 Openshift 发生了一些变化，并且该技术不再起作用。即使设置了 PYTHONPATH，当我 npm install 模块时仍然找不到 gyp 模块。知道为什么即使 PYTHONPATH 设置为包含模块的位置也找不到 gyp 模块吗？也许它被忽略了？ gyp 文件包含：
import sys
# TODO(mark): sys.path manipulation is some temporary testing stuff.
try:
import gyp
except ImportError, e:
import os.path
sys.path.append(os.path.join(os.path.dirname(sys.argv[0]), 'pylib'))
import gyp
if __name__ == '__main__':
sys.exit(gyp.main(sys.argv[1:]))
看不到不使用 PYTHONPATH 的原因（并且无法检查 gyp 文件中的 PYTHONPATH 值，因为它需要 root 权限，而我认为我在 Openshift 上没有 root 权限）。也许 npm 正在以某种方式重置环境？
我通过直接调用 node-gyp 而不是通过 npm install 解决：
node-gyp configure
node-gyp build
node-gyp install
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