rosdep update — The read operation timed out 解决方法

执行 rosdep update 时如果有以下错误发生

reading in sources list data from /etc/ros/rosdep/sources.list.d
Hit https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/osx-homebrew.yaml
ERROR: error loading sources list:
	('The read operation timed out',)

是因为由于访问 githubusercontent 不通造成的，可以通过下面的方法解决。

网站 https://ghproxy.com/ 支持 github 的资源代理，非常好用，我们将用此代理加速 rosdep 对 Github Raw 的访问，进而解决 rosdep update 超时问题。

• 首先确定初始化 rosdep init 是否成功，即是否在如下目录下生成此文件：/etc/ros/rosdep/sources.list.d/20-default.list，若没有，可从其他配置成功的电脑上拷贝过来；
• 修改 /etc/ros/rosdep/sources.list.d/20-default.list 文件，在所有 https://raw.githubusercontent.com 前加上 https://ghproxy.com/
  如下所示：

$ cat /etc/ros/rosdep/sources.list.d/20-default.list
# os-specific listings first
yaml https://ghproxy.com/https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/osx-homebrew.yaml osx

# generic
yaml https://ghproxy.com/https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/base.yaml
yaml https://ghproxy.com/https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/python.yaml
yaml https://ghproxy.com/https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/ruby.yaml
gbpdistro https://ghproxy.com/https://raw.githubusercontent.com/ros/rosdistro/master/releases/fuerte.yaml fuerte

# newer distributions (Groovy, Hydro, ...) must not be listed anymore, they are being fetched from the rosdistro index.yaml instead

• 修改 /usr/lib/python2.7/dist-packages/rosdistro/__init__.py 文件，在 DEFAULT_INDEX_URL 前面加上 https://ghproxy.com/ ，修改完成如下所示：

DEFAULT_INDEX_URL = 'https://ghproxy.com/https://raw.githubusercontent.com/ros/rosdistro/master/index-v4.yaml'

• 修改 /usr/lib/python2.7/dist-packages/rosdep2/gbpdistro_support.py 文件，在 FUERTE_GBPDISTRO_URL 前面加上 https://ghproxy.com/ ，修改完成如下所示：

FUERTE_GBPDISTRO_URL = 'https://ghproxy.com/https://raw.githubusercontent.com/ros/rosdistro/' \
    'master/releases/fuerte.yaml'

和增加 TIMEOUT 时间

DOWNLOAD_TIMEOUT=45.0

• 修改 /usr/lib/python2.7/dist-packages/rosdep2/sources_list.py 文件，在 DEFAULT_SOURCES_LIST_URL 前面加上 https://ghproxy.com/ ，修改完成如下所示：

DEFAULT_SOURCES_LIST_URL = 'https://ghproxy.com/https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/sources.list.d/20-default.list'

• 修改 /usr/lib/python2.7/dist-packages/rosdep2/rep3.py 文件，在 REP3_TARGETS_URL 前面加上 https://ghproxy.com/ ，修改完成如下所示：

REP3_TARGETS_URL = 'https://ghproxy.com/https://raw.githubusercontent.com/ros/rosdistro/master/releases/targets.yaml'

• 修改 /usr/lib/python2.7/dist-packages/rosdistro/manifest_provider/github.py 文件的下面两个地方， 修改完成如下所示：

    if not repo.has_remote_tag(release_tag):
        raise RuntimeError('specified tag "%s" is not a git tag' % release_tag)

    url = 'https://ghproxy.com/https://raw.githubusercontent.com/%s/%s/package.xml' % (path, release_tag)

和

for package_xml_path in package_xml_paths:
        url = 'https://ghproxy.com/https://raw.githubusercontent.com/%s/%s/%s' % \
            (path, cache.ref(), package_xml_path + '/package.xml' if package_xml_path else 'package.xml')

以上更改完成后，再次输入

rosdep update

更新即可。