ruby on rails - How to raise error if cap deploy was not invoked using bundle exec -


i encountered subtle issue capistrano deployment gem dependencies , enforce how capistrano invoked.

how can detect capistrano invoked using 'bundle exec' this:

bundle exec cap app deploy

and not this:

cap app deploy

i raise error in latter case detecting method of invocation @ top of deploy.rb file.

it appears bundler sets $bundle_bin_path , $bundle_gemfile environment variables when running executables. example, this:

env >/tmp/1 bundler exec env >/tmp/2 diff -u /tmp/[12]

you'll see differences in environment.

so in deployment script, can this:

abort "you must run using 'bundle exec ...'" unless env['bundle_bin_path'] || env['bundle_gemfile']

hope helps.


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