[Bug 1251654] [NEW] Remove /var/lib/mongodb/mongodb.lock trying to start mongodb service

[Enrique Arizón Benito]

Public bug reported:

After non-clean shutdown /var/lib/mongodb/mongodb.lock avoid mongodb to
start properly. Adding next line to /etc/init/mongodb.conf  (anywhere in
the script section before launching the daemon) fixes the problem:

ps -eo %u | grep -q ^mongodb$ || rm -f /var/lib/mongodb/mongod.lock


Explained:
-   ps -ef  %u                                                       -> print all uid for current processes.
-   grep -q ^mongodb                                       ->  test if the mongo service is actually running. "mongodb" is the same value passed to start-stop-daemon  in the --chuid parameter.
-   || rm -f /var/lib/mongodb/mongod.lock   -> Unconditionally remove the lock file if test failed.


Ex1:

script
  ENABLE_MONGODB="yes"
  UID="mongodb" # <- Reuse value
  if [ -f /etc/default/mongodb ]; then . /etc/default/mongodb; fi
  ps -eo %u | grep -q "^${UID}$"  || rm -f /var/lib/mongodb/mongod.lock
  if [ "x$ENABLE_MONGODB" = "xyes" ]; then exec start-stop-daemon --start --quiet --chuid ${UID} --exec  /usr/bin/mongod -- --config /etc/mongodb.conf; fi
end script

** Affects: mongodb (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Remove /var/lib/mongodb/mongodb.lock trying to start mongodb service

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