zsh command hash table is stale with system ruby

[bricestacey]

I have a zsh script to setup dev environments that create tmux sessions and windows. (see http://pastie.org/2643820)

Occasionally, a tmux window's zsh's command hash would still be pointing to the system ruby.

[master][~/code/ezpz] hash | grep ruby=
jruby=/Users/brice/.rbenv/shims/jruby
ruby=/usr/bin/ruby

[master][~/code/ezpz] env | grep PATH
PATH=/Users/brice/.rbenv/shims:/Users/brice/.rbenv/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/Users/brice/.rbenv/shims:/Users/brice/.rbenv/bin:/opt/local/bin:/usr/local/git/bin

[master][~/code/ezpz] ruby -v
ruby 1.8.7 (2010-01-10 patchlevel 249) [universal-darwin11.0]

[master][~/code/ezpz] which ruby
/usr/bin/ruby

[master][~/code/ezpz] /Users/brice/.rbenv/shims/ruby -v
ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin11.0.0]

Would it be a good idea to maybe include a call the builtin rehash after rbenv-init has been run? This seems to have solved my problem. I just do the following in .zshrc

export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"
builtin rehash

[bricestacey]

Here is some background information I found on this issue from rvm's history: rvm/rvm@f6473f2

[josh]

Seems like zsh really needs rehash after any calls to rbenv rehash.

Theres a few issues. rehash is specific to zsh so we just can't add a call to our scripts. We'd need to detect zsh which we're already doing a bad job already. See #59.

Also rbenv rehash spawns a subprocess so running rehash there won't affect your current shell.

So I don't really see a good way to approach this issue. RVM is able to just call out to rehash since its one big ass shell function.

[bricestacey]

hash -r is a builtin for both bash and zsh to empty the hash.

I am an unsophisticated shell user so I'm afraid I have little more to add other than these observations.

[sstephenson]

Josh, seems like we could force this by calling hash -r every time our rbenv function runs.

[dtuite]

I think I'm having the same problem with zsh. I can't seem to use rbenv's ruby no matter what I try.

rbenv global
=> 1.9.3-p0

rbenv local
=> 1.9.3-p0

which ruby
=> /usr/bin/ruby

hash | grep ruby=
ruby=/usr/bin/ruby

I have the following in my .zshrc

export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"
builtin hash -r

I don't actually know what the "hash" is or what rehash does but I'm sure I've typed it at least 20 times at various stages! Nothing seems to work.

[freshfey]

@dtuite not sure if this solves your problem, but I had two export PATH=... lines in my .zshrc, deleting one solved the problem for me (without the builtin hash -r)

[dtuite]

That could be it all right. I have multiple export PATH=.. lines in my .zshrc also. Unfortunately I can't test at the moment because I'm back on RVM.

Thanks for the tip though.

[thomasklemm]

Just installed a gem with an executable for the first time after switching to zsh. With bash all I had to do was run rbenv rehash sometimes to get access to the executable. In zsh however, this did not work. I also use oh-my-zsh with the rbenv plugin.

Solved it by first removing the oh-my-zsh rbenv plugin from ~/.zshrc, doing an rbenv rehash, then running hash -r. So it might be a good option to always run hash -r after rbenv rehash.