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Comment by omoikane | Hacker News Reader

What's the motivation behind closing file descriptors 3 and 4?

   # Close weird external file descriptors
   exec 3>&-
   exec 4>&-

From this commit:

https://github.com/dehydrated-io/dehydrated/commit/b116e6bc2...

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When are those ever used? Is it to customize output for when you’re sending to a file vs terminal?

systemd socket activation opens extra fds starting from fd 3 (SD_LISTEN_FDS_START). Though I can't think of a scenario where this may be relevant for dehydrated. Maybe some weird systemd unit somewhere that invoke dehydrated does this?

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