there is a leak in the unix domain socket of the docker client

[hansedong]

Recently, during the process of using drone (version 0.8.10), I found that there are a large number of unix domain sockets in the drone-agent process, and the number is more than 18000+. This is obviously not a normal phenomenon, which means , The docker client (that is, drone-agent) did not release the socket link between it and the dockerd process, and further, there was a leakage problem.

At first, I tried to upgrade the docker version to docker-ce 19.03.8, but the problem remained. Later, by tracing Drone's code, I found that it used the source package cncd/pipeline. However, the functions provided by this package do not provide the Close socket capability. I did a fix in my production environment and the problem was solved.

Originally I wanted to submit a PR, but I saw that there was already a PR trying to fix this problem #20 . The socket leakage problem is a bit serious, so I have 2 problems:

1. Why is this PR not merged?
2. Does the owner of this project still plan to fix this problem, and does it require me to submit a PR again?

[hansedong]

@bradrydzewski @tboerger any ideas ?

[bradrydzewski]

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