TmpIO doesn't respect PassengerDataBufferDir

[jcoyne]

Issue report

Fill in as much as possible so that we can understand, find and fix the problem.

Are you sure this is a bug in Passenger?
Yes
Please try with the newest version of Passenger to avoid issues that have already been fixed

Question 1: What is the problem?

• What is the expected behavior?
  Temporary upload files are written to PassengerDataBufferDir
• What is the actual behavior?
  Temporary files are written to $TMPDIR
• How can we reproduce it? Please try to provide a sample application (or Virtual Machine) demonstrating the issue. Otherwise, if we can't reproduce it, we might have to ask you a number of followup questions or run certain commands to try and figure out the problem.
  We have this config:

<IfModule mod_passenger.c>
  PassengerDataBufferDir "/opt/app/lyberadmin/purl-fetcher/shared/tmp"
  PassengerDefaultRuby "/usr/local/rvm/rubies/ruby-3.3.3/bin/ruby"
  PassengerInstanceRegistryDir "/var/run/passenger-instreg"
  PassengerMaxPoolSize 30
  PassengerRoot "/usr/lib/ruby/vendor_ruby/phusion_passenger/locations.ini"
  PassengerRuby "/usr/local/rvm/rubies/ruby-3.3.3/bin/ruby"
  PassengerShowVersionInHeader Off
</IfModule>

When we try to upload a file that is larger than /tmp we see this error in the log:

App 1019421 output: [7dfd293d-9322-451f-804c-90eba118759d] Errno::ENOSPC (No space left on device @ io_write - /tmp/PassengerTeeInput-1tfvyic):

Your answer:

Question 2: Passenger version and integration mode:

• open source 6.0.22/apache

Your answer:

Question 3: OS or Linux distro, platform (including version):

Your answer: Ubuntu 20.04.4 LTS

Question 4: Passenger installation method:

Your answer:
[ ] RubyGems + Gemfile
[ ] RubyGems, no Gemfile
[x] Phusion APT repo
[ ] Phusion YUM repo
[ ] OS X Homebrew
[ ] source tarball
[ ] Other, please specify:

Question 5: Your app's programming language (including any version managers) and framework (including versions):
Your answer: Ruby 3.3.3, RVM, Rails 7.1.3.4

Question 6: Are you using a PaaS and/or containerization? If so which one?

• For example: Heroku, Amazon Container Services, Docker 1.9 with an image based on passenger-docker

Your answer: no

Question 7: Anything else about your setup that we should know?

Your answer: none