在Heroku上构建错误

Question

我在推送我的Python应用程序到Heroku，它正在安装需求并在最后崩溃。下面是日志尾部：

.... 
SWIG/_m2crypto_wrap.c:4237: warning: 'saltlen' may be used uninitialized in this function 
gcc -pthread -shared build/temp.linux-x86_64-2.7/SWIG/_m2crypto_wrap.o -L/usr/lib -lssl -lcrypto -o build/lib.linux-x86_64-2.7/M2Crypto/__m2crypto.so 
Creating /tmp/build_5a922389-3865-4fa2-9bc3-ecfa3cd84781/.heroku/venv/lib/python2.7/site-packages/M2Crypto.egg-link (link to .) 
M2Crypto 0.22.dev is already the active version in easy-install.pth 

Installed /tmp/build_5a922389-3865-4fa2-9bc3-ecfa3cd84781/.heroku/src/m2crypto 
Successfully installed M2Crypto 
Cleaning up... 
Traceback (most recent call last): 
    File "/tmp/buildpack_5a922389-3865-4fa2-9bc3-ecfa3cd84781/vendor/virtualenv-1.7/virtualenv.py", line 16, in <module> 
import tempfile 
    File "/usr/local/lib/python2.7/tempfile.py", line 32, in <module> 
import io as _io 
    File "/usr/local/lib/python2.7/io.py", line 51, in <module> 
import _io 
ImportError: /tmp/build_5a922389-3865-4fa2-9bc3-ecfa3cd84781/.heroku/venv/lib/python2.7/lib-dynload/_io.so: undefined symbol: _PyLong_AsInt 
!  Error making virtualenv relocatable 


!  Push rejected, failed to compile Python app 

这是我使用的requrements.txt：

Flask==0.10.1 
SQLAlchemy==0.7.8 
Flask-Login==0.2.3 
Flask-WTF==0.6 
Flask-Gravatar 
Flask-OAuth==0.12 
Flask-SQLAlchemy 
Flask-Mail 
python-dateutil 
alembic 
psycopg2 
requests 
itsdangerous 
markdown 
raven 
blinker 
flask-cache 
flask-heroku 
pygeoip 
flask-babel 
beautifulsoup4 
python-memcached 
-e git+https://github.com/Hypernode/M2Crypto#egg=M2Crypto-0.22.dev 
birdy 

M2Crypto被清理之前编译。

后来编辑：

如果我在Heroku的盒子运行pip命令我得到一个非常simmilar错误：

Traceback (most recent call last): 
    File "/app/.heroku/venv/bin/pip", line 10, in <module> 
load_entry_point('pip==1.0.2', 'console_scripts', 'pip')() 
    File "/app/.heroku/venv/lib/python2.7/site-packages/distribute-0.6.24-py2.7.egg/pkg_resources.py", line 337, in load_entry_point 
return get_distribution(dist).load_entry_point(group, name) 
    File "/app/.heroku/venv/lib/python2.7/site-packages/distribute-0.6.24-py2.7.egg/pkg_resources.py", line 2279, in load_entry_point 
return ep.load() 
    File "/app/.heroku/venv/lib/python2.7/site-packages/distribute-0.6.24-py2.7.egg/pkg_resources.py", line 1989, in load 
entry = __import__(self.module_name, globals(),globals(), ['__name__']) 
    File "/app/.heroku/venv/lib/python2.7/site-packages/pip-1.0.2-py2.7.egg/pip/__init__.py", line 5, in <module> 
    import subprocess 
    File "/usr/local/lib/python2.7/subprocess.py", line 427, in <module> 
    import select 
ImportError: /app/.heroku/venv/lib/python2.7/lib-dynload/select.so: undefined symbol: _PyInt_AsInt 

Answer 1

原来的Heroku刚刚更新了其运行时的python-2.7.7 我必须指定一个runtime.txt并清除应用程序的缓存（两次）以修复它。

$ cat python-2.7.7>runtime.txt 

然后安装heroku repo插件并清除缓存。对于未知的原因，purge_cace第一次没有工作，不得不使用两次。

$ heroku plugins:install https://github.com/heroku/heroku-repo.git 
$ heroku repo:purge_cache -a appname 

有关更多信息heroku-repo插件here。

此问题在this stackoverflow thread或this heroku forum thread中讨论。