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I was setting up a CI build machine. Builds were supposed to be ran in disposable containers, but I needed a way to trigger a task on the host from inside the container. I didn't want to give containers shell access to host - kinda misses the point.
Solution: a server running on the host and listening for predefined commands on a named pipe. The pipe was bound into containers which would simply echo commands into it. Very simple and effective.
The hacky part? The server was an 8-line bash script.
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