Arch Linux

Description:
The .INSTALL file for the mariadb package does not remove the mysql user and its group when the package is removed. However since the mysql user's home directory (/var/lib/mysql) is removed by pacman automatically, the entry in /etc/passwd now points to a nonexistent directory and shadow.service fails on startup. This does not prevent the system from booting.


Additional info:
* Checked in mariadb-10.1.9-2


Journal:
~ >sudo systemctl status shadow.service
[sudo] password for hugh:
● shadow.service - Verify integrity of password and group files
Loaded: loaded (/usr/lib/systemd/system/shadow.service; static; vendor preset: disabled)
Active: failed (Result: exit-code) since Tue 2016-05-24 10:12:24 NZST; 49min ago
Process: 388 ExecStart=/usr/bin/pwck -r (code=exited, status=2)
Main PID: 388 (code=exited, status=2)

May 24 10:12:22 hugh-pc systemd[1]: Starting Verify integrity of password and group files...
May 24 10:12:23 hugh-pc pwck[388]: user 'mysql': directory '/var/lib/mysql' does not exist
May 24 10:12:24 hugh-pc pwck[388]: pwck: no changes
May 24 10:12:24 hugh-pc systemd[1]: shadow.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
May 24 10:12:24 hugh-pc systemd[1]: Failed to start Verify integrity of password and group files.
May 24 10:12:24 hugh-pc systemd[1]: shadow.service: Unit entered failed state.
May 24 10:12:24 hugh-pc systemd[1]: shadow.service: Failed with result 'exit-code'.


Steps to reproduce:
* Install mariadb with pacman
* Remove mariadb with pacman
* Reboot