rosdep update命令使用

1.首先将下面仓库的内容clone到本地

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

记录rosdistro存放地址，例如/home/gec/rosdistro
如果是自己的改成/home/user/rosdistro，其中user表示用户名

2.修改/usr/lib/python2/dist-packages/rosdep2/rep3.py文件

cd /usr/lib/python2/dist-packages/rosdep2 
sudo gedit rep3.py

将REP3_TARGETS_URL = ‘https://raw.githubusercontent.com/ros/rosdistro/master/releases/targets.yaml’ 替换成 REP3_TARGETS_URL = ‘file:///home/gec/rosdistro/releases/targets.yaml’
//替换后的/home/gec 即为第一步clone内容的存放地址

3.修改/usr/lib/python2/dist-packages/rosdistro/init.py文件

cd /usr/lib/python2.7/dist-packages/rosdistro
sudo gedit __init__.py

将原来文件中的 DEFAULT_INDEX_URL = ‘https://raw.githubusercontent.com/ros/rosdistro/master/index-v4.yaml’ 替换成 DEFAULT_INDEX_URL = ‘file:///home/gec/rosdistro/index-v4.yaml’
//替换后的/home/gec 即为第一步clone内容的存放地址

4.配置20-default.list文件

sudo rosdep init

重新生成/etc/ros/rosdep/sources.list.d/20-default.list.
//没有则手动创建/etc/ros/rosdep/sources.list.d/20-default.list.

如果sudo rosdep init成功，直接跳过以下创建文件步骤

进入到/etc/ros/目录下

cd /etc/ros     

创建rosdep文件

sudo mkdir rosdep && cd rosdep

创建sources.list.d文件

sudo mkdir sources.list.d && sources.list.d

创建20-default.list文档

sudo gedit 20-default.list 

如果sudo rosdep init成功，直接跳过以上创建文件步骤

//将20-default.list里面内容修改为下面的代码,注意内容/home/gec修改为自己的记录路径

# os-specific listings first
yaml file:///home/gec/rosdistro/rosdep/osx-homebrew.yaml osx

# generic
yaml file:///home/gec/rosdistro/rosdep/base.yaml
yaml file:///home/gec/rosdistro/rosdep/python.yaml
yaml file:///home/gec/rosdistro/rosdep/ruby.yaml
gbpdistro file:///home/gec/rosdistro/releases/fuerte.yaml fuerte

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

注意的是yaml file://表示固定格式/home…表示文件目录，所以是yaml file:///

5.最后直接

rosdep update