So, this is happening because I'm using Psych to encode strings before they get into the lockfile, and I think the inconsistency is coming for psych. I'm really not sure what we can do about this.

I opened an issue on Psych at ruby/psych#232, but I think I can do something to avoid re-writing the file if the contents is, other than the quoting difference, exactly the same. It won't save you from irrelevant diff lines, but it could mean that pod install can avoid dirtying your git status. Would that be worth doing?

@segiddins I think so. People not familiar with the Podfile.lock might assume that they've done something wrong to change it.

Also, thanks for filing the psych issue!

@cbrauchli in that case, CocoaPods/Core@5133472 should help! It won't save you from longer diffs, but it will hopefully mean that, when the semantic contents of the lockfile haven't changed, the file won't change the quotes.

Works for me! Is there any chance this change will make it onto the 0.36 branch or will we have to wait for 0.37?

I don't know if we'll have another 0.36 release, since releases take a few hours, but that's probably @kylef's call.

This is till happening in 0.37.1 and I noticed ruby/psych#232 is closed as invalid. Can we expect a long-term fix in CocoaPods or is the solution to get everyone on the same Ruby version?

It's not really a problem CocoaPods can fix, unfortunately. Both are valid YAML files.