(debian-policy.info)/run and /run/lock

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9.1.4 ‘/run’ and ‘/run/lock’
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The directory ‘/run’ is cleared at boot, normally by being a mount point
for a temporary file system.  Packages therefore must not assume that
any files or directories under ‘/run’ other than ‘/run/lock’ exist
unless the package has arranged to create those files or directories
since the last reboot.  Normally, this is done by the package via an
init script.  See Note: Writing the scripts. for more information.

Packages must not include files or directories under ‘/run’, or under
the older ‘/var/run’ and ‘/var/lock’ paths.  The latter paths will
normally be symlinks or other redirections to ‘/run’ for backwards
compatibility.