janl commented on issue #1097: CouchDB 2.1.1: Compaction daemon - unable to 
calculate free space for `/run/user/0`: `enoent`
URL: https://github.com/apache/couchdb/issues/1097#issuecomment-371176976
   The problem here is that Erlang?s disksup module doesn?t nicely play with 
all the special file systems that Linux seems to keep gaining (I lost track a 
while ago).
   This time it is `/run/user/0` that fails to have an `{fs,ls}tat()` run on it 
and that bubbles up to the compaction daemon that has to loop through all mount 
points to match the one where `[couchdb] database_dir` is located, to check for 
available space to decide whether it is safe to compact.
   We could try and start adding an exclusion list, but that will require 
maintenance. We could start and try be more clever handling 
`file:get_link_info()` errors, but that too seems error prone. This is a 
harmless warning too, maybe we can demote this to `debug` level?

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