check-swap-percent.rb fails on FreeBSD

[inferiorhumanorgans]

/opt/sensu/embedded/lib/ruby/gems/2.3.0/gems/sensu-plugins-memory-checks-1.0.2/bin/check-swap-percent.rb:6:in `exec': No such file or directory - /opt/sensu/embedded/lib/ruby/gems/2.3.0/gems/sensu-plugins-memory-checks-1.0.2/bin/check-swap-percent.sh (Errno::ENOENT)
    from /opt/sensu/embedded/lib/ruby/gems/2.3.0/gems/sensu-plugins-memory-checks-1.0.2/bin/check-swap-percent.rb:6:in `<main>'

[majormoses]

@inferiorhumanorgans I see that we rewrote that check anyways, can you test it against master?

[majormoses]

might be fixed with just a release which has been requested in #54

[eheydrick]

2.0.0 has the rewritten swap check. Can you try that and feel free to reopen if still a problem.

[inferiorhumanorgans]

Well free(1) is Linux only, so I can't imagine it works.

[majormoses]

@inferiorhumanorgans correct sorry I didnt look inside to see that it was simply shelling out for free to get that, we should look into a cross platform way to do this.

[majormoses]

@eheydrick please repopen

[inferiorhumanorgans]

This might be a good way to go:

https://github.com/threez/ruby-vmstat

[majormoses]

@inferiorhumanorgans I used that one for cross platform ram checking, looks like there was some stuff just merged using /proc/meminfo assuming you have that on your *nix system if I get some time next week to take a look at it I will.

[inferiorhumanorgans]

procfs is pretty much always guaranteed to be platform dependent.

[majormoses]

@inferiorhumanorgans can you check out #57 and see if that works for you? Its certainly rough around the edges but wanted to see if I could just get something working for you.