Fix Concurrent building occasionally cleans the Pods cache directory #11826

[fabcz]

For more details, please refer to #11826

[omarzl]

Thank you for the pr! 👏🏻
Just pinging you because I saw it has conflicts

[omarzl]

Hello @dnkoutso! can this one be merged? Thanks

[Westacular]

Based on my reading of the code: if version == Pod::VERSION, then rewriting the version file is redundant and entirely unnecessary, because you'd just be writing the same contents over again.

In which case, this can be addressed without adding a lock using something like

         version_file = root + 'VERSION'
         version = version_file.read.strip if version_file.file?

         if version != Pod::VERSION
             root.rmtree if root.exist?
             root.mkpath
             version_file.open('w') { |f| f << Pod::VERSION }
         end

(or, for extra safety, add the lock as well while only conditionally performing the write like I'm suggesting)