Nsryjdtyk

One year ago I asked for a yearly revision of my Interactive Linux upgrade script.

There is nothing new to the conditions, therefore please read the original question before you decide to comment and / or vote to close as unclear.

Additional notes:

• The script will always run interactively as I want to have full control.




• The script will be placed on 3 machines only, so I don't need much of generalization.




• As my POSIX shell scripting abilities get better, I would very much like to get further incentives.

#!/bin/sh



set -o nounset



# friendly computer description

readonly computer_description='Vlasta, Laptop, Mint 19'



# color definitions

readonly bold=$(tput bold)

readonly bold_red=${bold}$(tput setaf 1)

readonly bold_green=${bold}$(tput setaf 2)

readonly bold_yellow=${bold}$(tput setaf 3)

readonly bold_blue=${bold}$(tput setaf 4)

readonly bold_white=${bold}$(tput setaf 7)

readonly nocolor=$(tput sgr0)

readonly block_separator='----------------------------------------'



print_error_and_exit()

{

    printf '%snn' "${bold_red}An error occurred.${nocolor}"

    exit 1

}



step_number=0

execute_jobs()

{

    # process the given arguments as pairs

    while [ "${#}" -gt 1 ]

    do

        # increase and print the step number along with description

        step_number=$((step_number + 1))

        echo "Step #${step_number}: ${bold_green}${1}${nocolor}"



        # print the command to be run

        echo "Command: ${bold_yellow}${2}${nocolor}"



        echo "${bold_white}${block_separator}${nocolor}"



        # run the actual command

        # ShellCheck mistakenly things we should double quote the parameter

        # if we did, it would become a string and we'd get command not found

        # shellcheck disable=SC2086

        if sudo ${2}

        then

            echo

        else

            print_error_and_exit

        fi



        # move to another pair of arguments

        shift 2

    done

}



hostname=$(cat /etc/hostname)

printf 'n%sn'  "${bold_white}${block_separator}${nocolor}"

echo "Computer: ${bold_blue}${computer_description}${nocolor}"

echo "Hostname: ${bold_blue}${hostname}${nocolor}"

printf '%snn' "${bold_white}${block_separator}${nocolor}"





# the sudo password request shall proceed AFTER computer / hostname

# this is because the same script will always run in sequence on 3 computers



[ "$(id --user)" -eq 0 ] || sudo sh -c ":"



execute_jobs 

    'configure packages'                         'dpkg --configure --pending' 

    'fix broken dependencies'                    'apt-get --fix-broken install' 

    'update cache'                               'apt-get update' 

    'upgrade packages'                           'apt-get upgrade' 

    'upgrade packages with possible removals'    'apt-get dist-upgrade' 

    'remove unused packages'                     'apt-get --purge autoremove' 

    'clean up old packages'                      'apt-get autoclean'