Exception when using partial / third party CDN sources

[esteluk]

• [x] I've read and understood the CONTRIBUTING guidelines and have done my best effort to follow.

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What did you do?

If you configure a Podfile to use two CDN sources – one of which is the trunk, and the second is a private spec CDN that does not contain a complete mirror of the trunk, pod install fails to complete when I try to use dependencies from both.

source 'https://cdn.mycompany.com/api/pods/pods/'
source 'https://cdn.cocoapods.org/'

pod 'PrivateDependency'
pod 'Swiftlint'

What did you expect to happen?

Installs all pod dependencies successfully.

What happened instead?

### Error

Errno::ENOENT - No such file or directory @ rb_sysopen - /Users/nathan/.cocoapods/repos/pods-private/all_pods_versions_4_0_1.txt
/Users/nathan/Developer/Projects/open/cocoapods/Core/lib/cocoapods-core/cdn_source.rb:327:in `initialize'
/Users/nathan/Developer/Projects/open/cocoapods/Core/lib/cocoapods-core/cdn_source.rb:327:in `open'
/Users/nathan/Developer/Projects/open/cocoapods/Core/lib/cocoapods-core/cdn_source.rb:327:in `local_file'
/Users/nathan/Developer/Projects/open/cocoapods/Core/lib/cocoapods-core/cdn_source.rb:286:in `ensure_versions_file_loaded'
/Users/nathan/Developer/Projects/open/cocoapods/Core/lib/cocoapods-core/cdn_source.rb:208:in `search'
/Users/nathan/Developer/Projects/open/cocoapods/Core/lib/cocoapods-core/source/aggregate.rb:83:in `block in search'
/Users/nathan/Developer/Projects/open/cocoapods/Core/lib/cocoapods-core/source/aggregate.rb:83:in `select'
/Users/nathan/Developer/Projects/open/cocoapods/Core/lib/cocoapods-core/source/aggregate.rb:83:in `search'
/Users/nathan/.rbenv/versions/3.2.3/lib/ruby/gems/3.2.0/gems/cocoapods-1.15.2/lib/cocoapods/resolver.rb:416:in `create_set_from_sources'
/Users/nathan/.rbenv/versions/3.2.3/lib/ruby/gems/3.2.0/gems/cocoapods-1.15.2/lib/cocoapods/resolver.rb:385:in `find_cached_set'
/Users/nathan/.rbenv/versions/3.2.3/lib/ruby/gems/3.2.0/gems/cocoapods-1.15.2/lib/cocoapods/resolver.rb:360:in `specifications_for_dependency'
/Users/nathan/.rbenv/versions/3.2.3/lib/ruby/gems/3.2.0/gems/cocoapods-1.15.2/lib/cocoapods/resolver.rb:165:in `search_for'
/Users/nathan/.rbenv/versions/3.2.3/lib/ruby/gems/3.2.0/gems/cocoapods-1.15.2/lib/cocoapods/resolver.rb:274:in `block in sort_dependencies'
/Users/nathan/.rbenv/versions/3.2.3/lib/ruby/gems/3.2.0/gems/cocoapods-1.15.2/lib/cocoapods/resolver.rb:267:in `each'
/Users/nathan/.rbenv/versions/3.2.3/lib/ruby/gems/3.2.0/gems/cocoapods-1.15.2/lib/cocoapods/resolver.rb:267:in `sort_by'
/Users/nathan/.rbenv/versions/3.2.3/lib/ruby/gems/3.2.0/gems/cocoapods-1.15.2/lib/cocoapods/resolver.rb:267:in `sort_by!'
/Users/nathan/.rbenv/versions/3.2.3/lib/ruby/gems/3.2.0/gems/cocoapods-1.15.2/lib/cocoapods/resolver.rb:267:in `sort_dependencies'

Swiftlint uses CDN shard 4_0_1 and Cocoapods queries each CDN repo for the contents of this shard. If this CDN shard doesn't exist on a repo (which is very likely for any private CDN that doesn't copy the trunk, but very unlikely for the real trunk), this file returns a 404 and isn't downloaded successfully. This leads to the above exception ☝🏽

If I remove any trunk dependencies from my Podfile, pod install completes as expected.

CocoaPods Environment

Stack

   CocoaPods : 1.15.2
        Ruby : ruby 3.2.3 (2024-01-18 revision 52bb2ac0a6) [arm64-darwin23]
    RubyGems : 3.5.5
        Host : macOS 14.3.1 (23D60)
       Xcode : 15.3 (15E204a)
         Git : git version 2.39.3 (Apple Git-146)
Ruby lib dir : /Users/nathan/.rbenv/versions/3.2.3/lib
Repositories : 
               pods-private - CDN - https://cdn.mycompany.com/api/pods/pods/
               trunk - CDN - https://cdn.cocoapods.org/

Installation Source

Executable Path: /Users/nathan/.rbenv/versions/3.2/bin/pod

Plugins

cocoapods-deintegrate : 1.0.5
cocoapods-plugins     : 1.0.0
cocoapods-search      : 1.0.1
cocoapods-trunk       : 1.6.0
cocoapods-try         : 1.2.0
slather               : 2.7.4

Project that demonstrates the issue

Will try to identify this later.