Commits on Mar 29, 2022

1. [disk][linux] add HOST_PROC_MOUNTINFO, closes shirou#1271 …

   The changes to gopsutil for reading /proc/1/mountinfo affected
   applications running under restricted environments that disallows access
   to /proc/1/mountinfo. shirou#1159 was filed for android but other restricted
   environments are also affected (eg, snaps)). The fix for shirou#1159 addressed
   the application behavior to work under confinement for non-android as
   well. However, depending on the system, the attempt to read
   /proc/1/mountinfo could cause a sandbox denial in the logs which can be
   quite noisy if using gopsutil as part of a monitoring solution that
   polls often.
   
   This introduces HOST_PROC_MOUNTINFO to force reading from the parent dir
   of the specified path instead of first trying /proc/1. When unset,
   retain the current behavior with fallback. This allows people, for
   example, to set HOST_PROC_MOUNTINFO=/proc/self/mountinfo when gopsutil
   is running under these restricted environments.
   
   This change updates the private readMountFile() to use a root path
   instead of a root subpath, and adjusts PartitionsWithContext() to set
   the root path to /proc/1 initially and falling back to /proc/self. When
   HOST_PROC_MOUNTINFO is not empty, set the root path to the parent
   directory of HOST_PROC_MOUNTINFO.

   

   jdstrand committed Mar 29, 2022
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