flockit: init at 2012-08-11

The flockit library and tool exists solely because rsync doesn't have file
locking.

It's not used like a normal library; you don't link against it, and you don't
have to patch your source code to use it. It's inserted between your program and
its libraries by use of LD_PRELOAD.

For example:

  $ env LD_PRELOAD=$(nix-build -A pkgs.flockit)/lib/libflockit.so FLOCKIT_FILE_PREFIX=test rsync SRC DEST

Besides the library a handy executable is provided which can simplify the above to:

  $ $(nix-build -A pkgs.flockit)/bin/flockit test rsync SRC DEST

Also see the following blog post:
https://www.swiftstack.com/blog/2012/08/15/old-school-monkeypatching/

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