How do I run rosdep init without sudo? [closed]

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Hi, I am trying to do a non privileged install of ros melodic and wanted to know whether it is possible to run rosdep without sudo.

When searching online i found this command ( https://github.com/ros-infrastructure... ):

ROSDEP_SOURCE_PATH=/tmp/asdf rosdep init

When i execute it, i get

$ ROSDEP_SOURCE_PATH=/tmp/asdf rosdep init
ERROR: cannot create /etc/ros/rosdep/sources.list.d:
[Errno 13] Permission denied: '/etc/ros/rosdep'

Am i doing something wrong or was this very useful feature removed for some reason?

I appreciate any hints.
- barcode