What is subprojects/.wraplock for?

[dpirch]

It is an empty file apparently created when meson downloads wrap subprojects, but why does it remain there?

Should I delete it? Should I add it to my git repository? Should I add it to .gitignore?

[bonzini]

It remains there because it is used together with file-locking system calls. Removing it would be racy.

     meson 1                  meson 2                      meson 3
     -------------------------------------------------------------------------------
     create
     lock
     unlock
                              (file already there, ok)
                              lock
     remove
                                                           create
                                                           lock (BAD!)

You can add it to .gitignore.