无法运行catkin_make，无法解析UnicodeDecodeError

Question

这让我抓狂，我已经尝试了很多事情，例如改变语言环境，但是在工作空间初始化之后仍然会得到这个，然后在子目录上执行catkin_make。

在最近安装的arch dist、ros-indigo、python2.7和python3.5上运行

johnny@localhost:~/ros$ catkin_make
Base path: /home/johnny/ros
Source space: /home/johnny/ros/src
Build space: /home/johnny/ros/build
Devel space: /home/johnny/ros/devel
Install space: /home/johnny/ros/install
####
#### Running command: "cmake /home/johnny/ros/src -DCATKIN_DEVEL_PREFIX=/home/johnny/ros/devel -DCMAKE_INSTALL_PREFIX=/home/johnny/ros/install -G Unix Makefiles" in "/home/johnny/ros/build"
####
-- Using CATKIN_DEVEL_PREFIX: /home/johnny/ros/devel
-- Using CMAKE_PREFIX_PATH: /opt/ros/indigo
-- This workspace overlays: /opt/ros/indigo
-- Using PYTHON_EXECUTABLE: /usr/bin/python
-- Using default Python package layout
-- Using empy: /usr/lib/python2.7/site-packages/em.py
-- Using CATKIN_ENABLE_TESTING: ON
-- Call enable_testing()
-- Using CATKIN_TEST_RESULTS_DIR: /home/johnny/ros/build/test_results
-- Found gtest: gtests will be built
CMake Warning at /opt/ros/indigo/share/catkin/cmake/test/nosetests.cmake:96 (message):
  nosetests not found, Python tests can not be run (try installing package
  'python3-nose')
Call Stack (most recent call first):
  /opt/ros/indigo/share/catkin/cmake/all.cmake:147 (include)
  /opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:20 (include)
  CMakeLists.txt:52 (find_package)


-- catkin 0.6.18
-- BUILD_SHARED_LIBS is on
/opt/ros/indigo/share/catkin/cmake/em/order_packages.cmake.em:23: error: <class 'UnicodeDecodeError'>: 'ascii' codec can't decode byte 0xc3 in position 205: ordinal not in range(128)
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/em.py", line 3302, in <module>
    if __name__ == '__main__': main()
  File "/usr/lib/python2.7/site-packages/em.py", line 3300, in main
    invoke(sys.argv[1:])
  File "/usr/lib/python2.7/site-packages/em.py", line 3283, in invoke
    interpreter.wrap(interpreter.file, (file, name))
  File "/usr/lib/python2.7/site-packages/em.py", line 2295, in wrap
    self.fail(e)
  File "/usr/lib/python2.7/site-packages/em.py", line 2284, in wrap
    callable(*args)
  File "/usr/lib/python2.7/site-packages/em.py", line 2359, in file
    self.safe(scanner, done, locals)
  File "/usr/lib/python2.7/site-packages/em.py", line 2401, in safe
    self.parse(scanner, locals)
  File "/usr/lib/python2.7/site-packages/em.py", line 2421, in parse
    token.run(self, locals)
  File "/usr/lib/python2.7/site-packages/em.py", line 1425, in run
    interpreter.execute(self.code, locals)
  File "/usr/lib/python2.7/site-packages/em.py", line 2595, in execute
    _exec(statements, self.globals, locals)
  File "<string>", line 17, in <module>
  File "/usr/lib/python2.7/site-packages/catkin_pkg/topological_order.py", line 111, in topological_order
    for path, package in find_packages(space).items():
  File "/usr/lib/python2.7/site-packages/catkin_pkg/packages.py", line 83, in find_packages
    packages = find_packages_allowing_duplicates(basepath, exclude_paths=exclude_paths, exclude_subspaces=exclude_subspaces, warnings=warnings)
  File "/usr/lib/python2.7/site-packages/catkin_pkg/packages.py", line 110, in find_packages_allowing_duplicates
    packages[path] = parse_package(os.path.join(basepath, path), warnings=warnings)
  File "/usr/lib/python2.7/site-packages/catkin_pkg/package.py", line 370, in parse_package
    return parse_package_string(f.read(), filename, warnings=warnings)
  File "/usr/lib/python3.5/encodings/ascii.py", line 26, in decode
    return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 205: ordinal not in range(128)
CMake Error at /opt/ros/indigo/share/catkin/cmake/safe_execute_process.cmake:11 (message):
  execute_process(/home/johnny/ros/build/catkin_generated/env_cached.sh
  "/usr/bin/python" "/usr/lib/python2.7/site-packages/em.py" "--raw-errors"
  "-F" "/home/johnny/ros/build/catkin_generated/order_packages.py" "-o"
  "/home/johnny/ros/build/catkin_generated/order_packages.cmake"
  "/opt/ros/indigo/share/catkin/cmake/em/order_packages.cmake.em") returned
  error code 1
Call Stack (most recent call first):
  /opt/ros/indigo/share/catkin/cmake/em_expand.cmake:25 (safe_execute_process)
  /opt/ros/indigo/share/catkin/cmake/catkin_workspace.cmake:35 (em_expand)
  CMakeLists.txt:63 (catkin_workspace)


-- Configuring incomplete, errors occurred!
See also "/home/johnny/ros/build/CMakeFiles/CMakeOutput.log".
See also "/home/johnny/ros/build/CMakeFiles/CMakeError.log".
Invoking "cmake" failed'

非常感谢!

Answer 1

这看起来像是unicode的问题。简而言之，您已经将被解释为字节字符串的内容传递给需要将其解码为Unicode字符的内容，但是默认的编解码器(ascii)失败了。有关此here的更多信息。

这个问题有很多解决方案。我建议这样做：

yassin@pc:/usr/local/lib/python2.7/site-packages# cat sitecustomize.py
# encoding=utf8  
import sys  

reload(sys)  
sys.setdefaultencoding('utf8')

要检查这是否有效，您需要执行以下操作：

yassin@pc:~/home# python
Python 2.7.6 (default, Dec  6 2013, 14:49:02)
[GCC 4.4.5] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> reload(sys)
<module 'sys' (built-in)>
>>> sys.getdefaultencoding()
'utf8'
>>>

希望它能帮上忙！干杯。

Answer 2

将系统默认区域设置设置为en_IN.utf8应该可以解决此问题。

例如，如果您使用bash，则可以在~/.bashrc中添加以下行：

LANG=en_IN.utf8
export LANG

catkin工具包使用系统默认区域设置来加载消息或服务文件。