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sparse: reliably avoid writing to store without a lock...

sparse: reliably avoid writing to store without a lock With the code as written before this patch we can still end up writing to store in `debugsparse`. Obviously we'll write to it if by accident a store requirement is modified, but more importantly we write to it if another concurrent transaction modifies the requirements file on disk. We can't rule this out since we're not holding the store lock, so it's better to explicitly pass a permission to write instead of inferring it based on file contents.

Martin von Zweigbergk - - Load All Authors

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        Gregory Szorc
    
narrow: remove narrowrevlog...

              r39807
            
      Address commentary in manifest.excludedmanifestrevlog.add -

        Augie Fackler
    
narrow: add a TODO document...

              r36121
            
      specifically we should improve the collaboration with core so that

      add() never gets called on an excluded directory and we can improve

      the stand-in to raise a ProgrammingError.

      Reason more completely about rename-filtering logic in

      narrowfilelog. There could be some surprises lurking there.

        Martin von Zweigbergk
    
narrow: update TODO.rst now that we share format with sparse...

              r40116
            
      Formally document the narrowspec format. For bonus points, unify with the

      server-specified narrowspec format.

        Augie Fackler
    
narrow: add a TODO document...

              r36121
            
      narrowrepo.setnarrowpats() or narrowspec.save() need to make sure

      they're holding the wlock.

        Martin von Zweigbergk
    
narrow: move remaining narrow-limited dirstate walks to core...

              r40123
            
      The follinwg places do an unrestricted dirstate walk (including files outside the

      narrowspec). Some of them should perhaps not do that.

       * debugfileset

       * perfwalk

       * sparse (but restricted to sparse config)

       * largefiles

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Gregory Szorc narrow: remove narrowrevlog...	r39807	Address commentary in manifest.excludedmanifestrevlog.add -
Augie Fackler narrow: add a TODO document...	r36121	specifically we should improve the collaboration with core so that
		add() never gets called on an excluded directory and we can improve
		the stand-in to raise a ProgrammingError.

		Reason more completely about rename-filtering logic in
		narrowfilelog. There could be some surprises lurking there.

Martin von Zweigbergk narrow: update TODO.rst now that we share format with sparse...	r40116	Formally document the narrowspec format. For bonus points, unify with the
		server-specified narrowspec format.
Augie Fackler narrow: add a TODO document...	r36121
		narrowrepo.setnarrowpats() or narrowspec.save() need to make sure
		they're holding the wlock.
Martin von Zweigbergk narrow: move remaining narrow-limited dirstate walks to core...	r40123
		The follinwg places do an unrestricted dirstate walk (including files outside the
		narrowspec). Some of them should perhaps not do that.

		* debugfileset
		* perfwalk
		* sparse (but restricted to sparse config)
		* largefiles