reporting a better error when tmp doesn't work for temporary executables #5900
Description
Environment
- JRuby version:
9.2.8.0 - OS:
Linux vpna-dev-tmc039.ad-dev.issgovernance.com 3.10.0-1062.1.1.el7.x86_64 #1 SMP Tue Aug 13 18:39:59 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Expected Behavior
When packing up a JRuby application as an executable JAR via warble, the app may crash if the temp directory (/tmp by default on most *nix systems) is mounted as read-only or noexec. A useful error message that instructs the user to set a temp directory to some user-space would be helpful. E.g. /tmp is mounted as read-only or noexec. Some native extensions may not work properly. Try setting the "java.io.tmpdir" variable to a directory that is writeable and executable by your process, if you run into errors with native extensions.
Example Application
example/bin/example
require 'irb'
IRB.start(__FILE__)config/warble.rb
Warbler::Config.new do |config|
config.features = %w(gemjar)
config.includes = FileList["script.rb"]
config.jar_extension = "jar"
config.autodeploy_dir = "dist/"
config.bytecode_version = "1.8"
endwarble
java -jar example.jar # throws an error if /tmp is noexec or read-onlyActual Behavior
When /tmp is mounted as noexec an error similar to the following is written to the console:
NotImplementedError: fstat unimplemented unsupported or native support failed to load; see https://github.com/jruby/jruby/wiki/Native-Libraries
initialize at org/jruby/RubyIO.java:1015
open at org/jruby/RubyIO.java:1156
initialize at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/irb/input-method.rb:141
initialize at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/irb/context.rb:70
initialize at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/irb.rb:410
start at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/irb.rb:381
<main> at dbconsole/bin/dbconsole:10
load at org/jruby/RubyKernel.java:1022
<main> at uri:classloader:/META-INF/main.rb:1
require at org/jruby/RubyKernel.java:987
<main> at uri:classloader:/META-INF/main.rb:1
<main> at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:1
ERROR: org.jruby.embed.EvalFailedException: (NotImplementedError) fstat unimplemented unsupported or native support failed to load; see https://github.com/jruby/jruby/wiki/Native-LibrariesIf you pass -Djruby.native.verbose=true to java, you'll get more information that indicates that /tmp may be the problem (e.g. this gist).