What I did
There is a bug that occasionally turn root-overlay as RO. This makes /etc & /home as RO. This blocks any new remote user login, as that needs to write into /etc & /home.

This tool scans /etc & /home (or given dirs) as in RW or RO state. If RO, it could create a writable overlay using tmpfs.
This is transient and stays until next reboot. Any write after the overlay will be lost upon reboot.

But this allows new remote users login.

How I did it
Create upper & work dirs in /run/mount (tmpfs). Mount /etc & /home as lowerdirs and use the same name for final merge. This allows anyone opening a file in /etc or /home to operate on the merged overlay, transparently.

How to verify it
Mount any dir on tmpfs ( mount -t tmpfs tmpfs test_dir)
remount as RO (mount -o remount,ro test_dir)
Pass that dir to this script. (disk_check.py -d ./test_dir)
Now it should be RW

1) Set default loglevel to SYSLOG_ERR
2) Make log level configurable via args

…1747)

What I did
Have independent subdirs for each mounted dir to avoid any collisions of files/dirs by same name.
Adopt for older version of python3

How I did it
Changes:
Individual subdirs for each dir to be mounted
subprocess args made compatible with older version of python3 (tested in version 3.5.3)

How to verify it
Simulate read-only state
Run this script
Test ssh via new tacacs user (who had not logged in earlier)

Move to python2