rosdep init 失败的解决办法

在/etc/ros/rosdep/sources.list.d/这个目录下创建20-default.list文件

sudo gedit /etc/ros/rosdep/sources.list.d/20-default.list

20-default.list 文件的內容是：

# os-specific listings first
yaml https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/osx-homebrew.yaml osx
 
# generic
yaml https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/base.yaml
yaml https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/python.yaml
yaml https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/ruby.yaml
gbpdistro 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

保存后退出，执行rosdep update

rosdep update失败的解决办法

1、在https://github.com/ros/rosdistro 网址中下载源码，把里面的文件解压在 /etc/ros 中,

或者

cd /etc/ros

sudo git clone https://github.com/ros/rosdistro.git

2、修改/etc/ros/rosdep/sources.list.d/20-default.list文件

sudo gedit /etc/ros/rosdep/sources.list.d/20-default.list

修改内容如下:

# os-specific listings first
#yaml https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/osx-homebrew.yaml osx
yaml file:///etc/ros/rosdistro/master/rosdep/osx-homebrew.yaml osx
# generic
#yaml https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/base.yaml
#yaml https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/python.yaml
#yaml https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/ruby.yaml
#gbpdistro https://raw.githubusercontent.com/ros/rosdistro/master/releases/fuerte.yaml fuerte

yaml file:///etc/ros/rosdistro/rosdep/base.yaml
yaml file:///etc/ros/rosdistro/rosdep/python.yaml
yaml file:///etc/ros/rosdistro/rosdep/ruby.yaml
gbpdistro file:///etc/ros/rosdistro/releases/fuerte.yaml fuerte

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

3 打开/usr/lib/python2.7/dist-packages/rosdistro/init.py这个文件，按照下面的代码进行修改。

# index information

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

保存后执行rosdep update，如果不成功多执行几次，成功后出现下面打印

reading in sources list data from /etc/ros/rosdep/sources.list.d
Hit file:///etc/ros/rosdistro/rosdep/osx-homebrew.yaml
Hit file:///etc/ros/rosdistro/rosdep/base.yaml
Hit file:///etc/ros/rosdistro/rosdep/python.yaml
Hit file:///etc/ros/rosdistro/rosdep/ruby.yaml
Hit file:///etc/ros/rosdistro/releases/fuerte.yaml
Query rosdistro index file:///etc/ros/rosdistro/index-v4.yaml
Skip end-of-life distro "ardent"
Skip end-of-life distro "bouncy"
Skip end-of-life distro "crystal"
Add distro "dashing"
Add distro "eloquent"
Add distro "foxy"
Skip end-of-life distro "groovy"
Skip end-of-life distro "hydro"
Skip end-of-life distro "indigo"
Skip end-of-life distro "jade"
Add distro "kinetic"
Skip end-of-life distro "lunar"
Add distro "melodic"
Add distro "noetic"
updated cache in /home/xxxx/.ros/rosdep/sources.cache