CageFS can't find binaries like /bin/bash or /usr/sbin/sendmail

Symptoms

You are seeing one of the following errors or a similar one:

Can't exec "/usr/sbin/sendmail": No such file or directory


su: failed to execute /bin/bash: No such file or directory


cagefs_enter_user: /bin/bash: No such file or directory

Description 

One of the cause for this issue is a broken cpanel-wrap package.

# /usr/local/cpanel/scripts/check_cpanel_rpms

[2021-06-13 01:40:04 -0300]   

[2021-06-13 01:40:04 -0300]   Problems were detected with cPanel-provided files which are RPM controlled.

[2021-06-13 01:40:04 -0300]   If you did not make these changes intentionally, you can correct them by running:

[2021-06-13 01:40:04 -0300]   

[2021-06-13 01:40:04 -0300]   > /usr/local/cpanel/scripts/check_cpanel_rpms --fix

[2021-06-13 01:40:04 -0300]    

[2021-06-13 01:40:04 -0300]   The following files were found to be altered from their original RPM:

[2021-06-13 01:40:04 -0300]   cpanel-wrap,92.0,2.cp1192

Workaround

Run the check cPanel rpm script to verify and fix if you are impacted by this issue.

/usr/local/cpanel/scripts/check_cpanel_rpms --fix

If the script detected an issue with the cpanel-wrap package and reinstalled the package, you need to rebuild CageFS.

How to rebuild CageFS