LOG_SET_PREFIX() sets a logging prefix for the current block. The prefix is prepended to every logging message in the block, followed by ": ". If a logging prefix is already configured, it is overridden for the duration of the block, after which it is restored. A use case for this macro is when we're operating on an image or directory (using --root or --image). We can use LOG_SET_PREFIX() to prefix all logging messages with the directory or image that we're operating on.
System and Service Manager
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