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Update bundler to 2.5.6 #1426

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Update bundler to 2.5.6 #1426

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schneems
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@schneems schneems commented Feb 21, 2024 •
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Close #1408

schneems
schneems commented Feb 21, 2024
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changelogs/bundler_256.md
@@ -0,0 +1,3 @@
## Ruby apps with Bundler 2.x now receive version 2.5.6

The [Ruby Buildpack](https://devcenter.heroku.com/articles/ruby-support#libraries) now includes Bundler 2.5.6. Applications specifying Bundler 2.x in their `Gemfile.lock` will now receive this version of bundler.
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Leaving a note for anyone interested in when this is going to roll out. It is EOD for me today. I want to be around when this ships. I'll likely aim for around noon CST tomorrow. (Feb 22).

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The CI isn't publically viewable. Weird error here:

 Could not deploy 'hatchet-t-aceba7de13' (default_ruby) using 'Hatchet::GitApp' at path: './repos/rack/default_ruby'
       if this was expected add `allow_failure: true` to your deploy hash.
       Buildpack: nil
       Repo: https://git.heroku.com/hatchet-t-aceba7de13.git
       output:
       remote: Updated 5 paths from 278d00c        
       remote: Compressing source files... done.        
       remote: Building source:        
       remote: 
       remote: -----> Building on the Heroku-20 stack        
       remote: -----> Using buildpack: https://github.com/heroku/heroku-buildpack-ruby#schneems/bundler-256        
       remote: -----> Ruby app detected        
       remote: -----> Installing bundler 2.5.6        
       remote: -----> Removing BUNDLED WITH version in the Gemfile.lock        
       remote: -----> Compiling Ruby/Rack        
       remote: -----> Using Ruby version: ruby-3.1.4        
       remote: -----> Installing dependencies using bundler 2.5.6        
       remote:        Running: BUNDLE_WITHOUT='development:test' BUNDLE_PATH=vendor/bundle BUNDLE_BIN=vendor/bundle/bin BUNDLE_DEPLOYMENT=1 bundle install -j4        
       remote:        Your Ruby version is 3.1.4, but your Gemfile specified ~> 3.0.0        
       remote:        Bundler Output: Your Ruby version is 3.1.4, but your Gemfile specified ~> 3.0.0        
       remote:         
       remote:  !        
       remote:  !     Failed to install gems via Bundler.        
       remote:  !     Detected a mismatch between your Ruby version installed and        
       remote:  !     Ruby version specified in Gemfile or Gemfile.lock. You can        
       remote:  !     correct this by running:        
       remote:  !             
       remote:  !     $ bundle update --ruby        
       remote:  !     $ git add Gemfile.lock        
       remote:  !     $ git commit -m "update ruby version"        
       remote:  !             
       remote:  !     If this does not solve the issue please see this documentation:        
       remote:  !             
       remote:  !     https://devcenter.heroku.com/articles/ruby-versions#your-ruby-version-is-x-but-your-gemfile-specified-y        
       remote:  !        
       remote:  !     Push rejected, failed to compile Ruby app.        
       remote: 
       remote:  !     Push failed        
       remote:  !        
       remote:  ! ## Warning - The same version of this code has already been built: 4f89dce50996cbceb755502192a742ccb9a51d02        
       remote:  !        
       remote:  ! We have detected that you have triggered a build from source code with version 4f89dce50996cbceb755502192a742ccb9a51d02        
       remote:  ! at least twice. One common cause of this behavior is attempting to deploy code from a different branch.        
       remote:  !        
       remote:  ! If you are developing on a branch and deploying via git you must run:        
       remote:  !        
       remote:  !     git push heroku <branchname>:main        
       remote:  !        
       remote:  ! This article goes into details on the behavior:        
       remote:  !   https://devcenter.heroku.com/articles/duplicate-build-version        
       remote: 
       remote: Verifying deploy...        
       remote: 
       remote: !	Push rejected to hatchet-t-aceba7de13.        
       remote: 
       To https://git.heroku.com/hatchet-t-aceba7de13.git
        ! [remote rejected] HEAD -> main (pre-receive hook declined)

It's because the behavior changed:

$ cat Gemfile
source "https://rubygems.org"

ruby "~> 3.0.0"

gem "rake"
⛄️ 3.1.4 🚀 /tmp/74d2406ceed790db8939548b5520a8e1
$ cat Gemfile.lock
GEM
  remote: https://rubygems.org/
  specs:
    rake (13.0.6)

PLATFORMS
  ruby
  x86_64-darwin-20

DEPENDENCIES
  rake

BUNDLED WITH
   2.3.7
$ bundle _2.5.6_ platform --ruby
No ruby version specified

Previously this would return 3.0.0 as that's what's in the Gemfile. This is a breaking change released as a minor change in 2.5.x

https://github.com/rubygems/rubygems/blob/3fbb8bb93cf54b14374825859541a522c43a8377/bundler/CHANGELOG.md#250-december-15-2023

Notably bundler 2.5.x does not support Ruby 2.6 and 2.7 which also has customers on the platform. https://devcenter.heroku.com/articles/ruby-support#unsupported-ruby-versions heroku-20 has Ruby back to 2.5.x and while it's technically an unsupported version, I'm mindful that we've never done anything to break a previously working Ruby version on a Heroku stack. So this puts me in uncharted territory.

The long term fix would be a BYO bundler policy that uses the exact version from the Gemfile.lock but that's going to require a lot of work.

In the very short term I would likely target 2.4.x as that's the feature being requested #1408.

@schneems schneems mentioned this pull request Feb 21, 2024
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@schneems schneems closed this Feb 21, 2024
@edmorley edmorley deleted the schneems/bundler-256 branch April 28, 2024 21:22
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Support Bundler 2.4.20+ to enable ruby file: '.ruby-version' in Gemfile
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