RVM after_cd Hook

Question

I'm trying to use the RVM hooks to run a command after I cd into a directory with my rails app.

The contents of my ~/.rvm/hooks/after_cd is:

echo "Now using $rvm_ruby_string"

The contents of my ~/.rvm/hooks/after_use is:

echo "Now using $rvm_ruby_string"

When I do $rmv use 1.9.2 I see my echo, but when I cd into the rails root directory for my app I don't get any echo.

Am I using the after_cd hook wrong?

$rvm -v says:

rvm 1.0.8 by Wayne E. Seguin (wayneeseguin@gmail.com) [http://rvm.beginrescueend.com/]

Answer 1

First you need to understand how rvm overwrite your system's default cd command.

Here's the answer explains this well.

In short, rvm defines a function like this in .rvm/script/cd

cd(){
  builtin cd $*                    #run system cd
  source after_cd_hooks            #run hook scripts
}

And you can find this line if you look into how this cd() defined.

__rvm_project_rvmrc && __rvm_after_cd || true

__rvm_project_rvmrc is the function to check if .rvmrc exists in the directory you change into.

So the hook scripts will only be sourced when .rvmrc exists in your project root.

So create your .rvmrc and try the cd again. Good Luck!

> /path/to/app/root/.rvmrc
cd /path/to/app/root

My rvm version:

rvm -v

rvm 1.23.14 (stable) by Wayne E. Seguin <wayneeseguin@gmail.com>, Michal Papis <mpapis@gmail.com> [https://rvm.io/]