Resolution
By default chrooted shell provides limited functionality only, it only allows to use very common commands such as `cp`, `mv`, `mkdir` and so on. `tar` is not included into chrooted shell as well as a lot of other system utilities. You can check /home/httpd/vhosts/chroot for details.
If you want to add more files to chroot for all the domains, you can copy them to the appropriate subfolder in /home/httpd/vhosts/chroot and run two commands:
/usr/local/psa/admin/sbin/chrootmng --remove --source=/var/www/vhosts/chroot --target=all
/usr/local/psa/admin/sbin/chrootmng --create --source=/var/www/vhosts/chroot --target=allNote, the paths in the example above may differs from your Plesk installation depending on Plesk and OS versions.
Note, some application may require additional libraries that must be also copied into appropriate folders in chroot.