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The newly introduced `ChangeTracker` class is now keeping track of all tracked file in addition to spawning and managing a corresponding `diff` instance that enables printing pretty _patch-style_ change summaries to the logging target.
This commit introduces `boost-process` and `diff` as dependencies of this library.
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The pointers to the actual function implementations are now fetched inside the `actual` namespace declared in the `actual_function.h` header.
Fixed source of _noreturn_ related warning during compilation by adding the appropriate flag. Sadly this means that we can not use `std::function` in this context as it doesn't seem to carry these _c-like_ flags.
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The `CHANGE_LOG_TARGET` environment variable enables passing the path of an arbitrary target file to the preloaded library.
This may be used to e.g. print the log to a separate `cat` instance and is necessary for logging change events without altering the output of the wrapped process.
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The goal is to implement a shared library to be loaded using `LD_PRELOAD` that tracks all file changes performed by a process.
This information is required to enable general purpose change logging inside a shell session. i.e. I want to be able to display diffs and before- / after-hashes of all changes performed by every single command without requiring every changed file to be known prior to execution.
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