Accessing the /samples/ partition, etc.

Code:
#!/bin/bash



: <<'DISCLAIMER'



THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES

OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

OTHER DEALINGS IN THE SOFTWARE.



This script is licensed under the terms of the MIT license.

Unless otherwise noted, code reproduced herein

was written for this script.



- The PiZeroAudio Crew -



DISCLAIMER



# script control variables



productname="RASPIAUDIO DAC+ and SPEAKER+ models" # the name of the product to install

scriptname="pizeroaudio" # the name of this script

spacereq=1 # minimum size required on root partition in MB

debugmode="no" # whether the script should use debug routines

debuguser="none" # optional test git user to use in debug mode

debugpoint="none" # optional git repo branch or tag to checkout

forcesudo="no" # whether the script requires to be ran with root privileges

promptreboot="no" # whether the script should always prompt user to reboot

mininstall="no" # whether the script enforces minimum install routine

customcmd="yes" # whether to execute commands specified before exit

armhfonly="yes" # whether the script is allowed to run on other arch

armv6="yes" # whether armv6 processors are supported

armv7="yes" # whether armv7 processors are supported

armv8="yes" # whether armv8 processors are supported

raspbianonly="no" # whether the script is allowed to run on other OSes

osreleases=( "Raspbian" ) # list os-releases supported

oswarning=( "Debian" "Kano" "Mate" "PiTop" "Ubuntu" ) # list experimental os-releases

osdeny=( "Darwin" "Kali" ) # list os-releases specifically disallowed



FORCE=$1

DEVICE_TREE=true

ASK_TO_REBOOT=false

CURRENT_SETTING=false

UPDATE_DB=false



BOOTCMD=/boot/cmdline.txt

CONFIG=/boot/config.txt

APTSRC=/etc/apt/sources.list

INITABCONF=/etc/inittab

BLACKLIST=/etc/modprobe.d/raspi-blacklist.conf

LOADMOD=/etc/modules

DTBODIR=/boot/overlays



# function define



confirm() {

    if [ "$FORCE" == '-y' ]; then

        true

    else

        read -r -p "$1 [y/N] " response < /dev/tty

        if [[ $response =~ ^(yes|y|Y)$ ]]; then

            true

        else

            false

        fi

    fi

}



prompt() {

        read -r -p "$1 [y/N] " response < /dev/tty

        if [[ $response =~ ^(yes|y|Y)$ ]]; then

            true

        else

            false

        fi

}



success() {

    echo -e "$(tput setaf 2)$1$(tput sgr0)"

}



inform() {

    echo -e "$(tput setaf 6)$1$(tput sgr0)"

}



warning() {

    echo -e "$(tput setaf 1)$1$(tput sgr0)"

}



newline() {

    echo ""

}



progress() {

    count=0

    until [ $count -eq $1 ]; do

        echo -n "..." && sleep 1

        ((count++))

    done

    echo

}

sudocheck() {

    if [ $(id -u) -ne 0 ]; then

        echo -e "Install must be run as root. Try 'sudo ./$scriptname'\n"

        exit 1

    fi

}



sysclean() {

    sudo apt-get clean && sudo apt-get autoclean

    sudo apt-get -y autoremove &> /dev/null

}



sysupdate() {

    if ! $UPDATE_DB; then

        echo "Updating apt indexes..." && progress 3 &

        sudo apt-get update 1> /dev/null || { warning "Apt failed to update indexes!" && exit 1; }

        echo "Reading package lists..."

        progress 3 && UPDATE_DB=true

    fi

}



sysupgrade() {

    sudo apt-get upgrade

    sudo apt-get clean && sudo apt-get autoclean

    sudo apt-get -y autoremove &> /dev/null

}



sysreboot() {

    warning "Some changes made to your system require"

    warning "your computer to reboot to take effect."

    newline

    if prompt "Would you like to reboot now?"; then

        sync && sudo reboot

    fi

}



arch_check() {

    IS_ARMHF=false

    IS_ARMv6=false



    if uname -m | grep "armv.l" > /dev/null; then

        IS_ARMHF=true

        if uname -m | grep "armv6l" > /dev/null; then

            IS_ARMv6=true

        fi

    fi

}



os_check() {

    IS_RASPBIAN=false

    IS_MACOSX=false

    IS_SUPPORTED=false

    IS_EXPERIMENTAL=false



    if [ -f /etc/os-release ]; then

        if cat /etc/os-release | grep "Raspbian" > /dev/null; then

            IS_RASPBIAN=true && IS_SUPPORTED=true

        fi

        if command -v apt-get > /dev/null; then

            for os in ${osreleases[@]}; do

                if cat /etc/os-release | grep $os > /dev/null; then

                    IS_SUPPORTED=true && IS_EXPERIMENTAL=false

                fi

            done

            for os in ${oswarning[@]}; do

                if cat /etc/os-release | grep $os > /dev/null; then

                    IS_SUPPORTED=false && IS_EXPERIMENTAL=true

                fi

            done

            for os in ${osdeny[@]}; do

                if cat /etc/os-release | grep $os > /dev/null; then

                    IS_SUPPORTED=false && IS_EXPERIMENTAL=false

                fi

            done

        fi

    fi

    if [ -d ~/.kano-settings ] || [ -d ~/.kanoprofile ]; then

        IS_RASPBIAN=false

        for os in ${oswarning[@]}; do

            if [ $os == "Kano" ]; then

                IS_SUPPORTED=false && IS_EXPERIMENTAL=true

            fi

        done

        for os in ${osdeny[@]}; do

            if [ $os == "Kano" ]; then

                IS_SUPPORTED=false && IS_EXPERIMENTAL=false

            fi

        done

    fi

    if [ -f ~/.pt-dashboard-config ] || [ -d ~/.pt-dashboard ]; then

        IS_RASPBIAN=false

        for os in ${oswarning[@]}; do

            if [ $os == "PiTop" ]; then

                IS_SUPPORTED=false && IS_EXPERIMENTAL=true

            fi

        done

        for os in ${osdeny[@]}; do

            if [ $os == "PiTop" ]; then

                IS_SUPPORTED=false && IS_EXPERIMENTAL=false

            fi

        done

    fi

    if [ -d ~/.config/ubuntu-mate ]; then

        for os in ${osdeny[@]}; do

            if [ $os == "Mate" ]; then

                IS_SUPPORTED=false && IS_EXPERIMENTAL=false

            fi

        done

    fi

    if uname -s | grep "Darwin" > /dev/null; then

        IS_MACOSX=true

        for os in ${osdeny[@]}; do

            if [ $os == "Darwin" ]; then

                IS_SUPPORTED=false && IS_EXPERIMENTAL=false

            fi

        done

    fi

}



raspbian_check() {

    IS_SUPPORTED=false

    IS_EXPERIMENTAL=false



    if [ -f /etc/os-release ]; then

        if cat /etc/os-release | grep "/sid" > /dev/null; then

            IS_SUPPORTED=true && IS_EXPERIMENTAL=false

        elif cat /etc/os-release | grep "stretch" > /dev/null; then

            IS_SUPPORTED=true && IS_EXPERIMENTAL=false

        elif cat /etc/os-release | grep "jessie" > /dev/null; then

            IS_SUPPORTED=true && IS_EXPERIMENTAL=false

        elif cat /etc/os-release | grep "wheezy" > /dev/null; then

            IS_SUPPORTED=true && IS_EXPERIMENTAL=false

        else

            IS_SUPPORTED=true && IS_EXPERIMENTAL=false

        fi

    fi

}



: <<'MAINSTART'



Perform all global variables declarations as well as function definition

above this section for clarity, thanks!



MAINSTART



# checks and init



arch_check

os_check



if [ $debugmode != "no" ]; then

    echo "USER_HOME is $USER_HOME" && newline

    echo "IS_RASPBIAN is $IS_RASPBIAN"

    echo "IS_MACOSX is $IS_MACOSX"

    echo "IS_SUPPORTED is $IS_SUPPORTED"

    echo "IS_EXPERIMENTAL is $IS_EXPERIMENTAL"

    newline

fi



if ! $IS_ARMHF; then

    warning "This hardware is not supported, sorry!"

    warning "Config files have been left untouched"

    newline && exit 1

fi



if $IS_ARMv8 && [ $armv8 == "no" ]; then

    warning "Sorry, your CPU is not supported by this installer"

    newline && exit 1

elif $IS_ARMv7 && [ $armv7 == "no" ]; then

    warning "Sorry, your CPU is not supported by this installer"

    newline && exit 1

elif $IS_ARMv6 && [ $armv6 == "no" ]; then

    warning "Sorry, your CPU is not supported by this installer"

    newline && exit 1

fi



if [ $raspbianonly == "yes" ] && ! $IS_RASPBIAN;then

        warning "This script is intended for Raspbian on a Raspberry Pi!"

        newline && exit 1

fi



if $IS_RASPBIAN; then

    raspbian_check

    if ! $IS_SUPPORTED && ! $IS_EXPERIMENTAL; then

        newline && warning "--- Warning ---" && newline

        echo "The $productname installer"

        echo "does not work on this version of Raspbian."

        echo "Check https://github.com/$gitusername/$gitreponame"

        echo "for additional information and support"

        newline && exit 1

    fi

fi



if ! $IS_SUPPORTED && ! $IS_EXPERIMENTAL; then

        warning "Your operating system is not supported, sorry!"

        newline && exit 1

fi



if $IS_EXPERIMENTAL; then

    warning "Support for your operating system is experimental. Please visit"



    newline

fi



if [ $forcesudo == "yes" ]; then

    sudocheck

fi



newline

echo "This script will install everything needed to use"

echo "$productname"

newline





if confirm "Do you wish to continue?"; then



    newline

    echo "Checking hardware requirements..."



    if [ -e $CONFIG ] && grep -q "^device_tree=$" $CONFIG; then

        DEVICE_TREE=false

    fi



    if $DEVICE_TREE; then



        newline

        echo "Adding Device Tree Entry to $CONFIG"



        if [ -e $CONFIG ] && grep -q "^dtoverlay=hifiberry-dac$" $CONFIG; then

            echo "dtoverlay already active"

        else

            echo "dtoverlay=hifiberry-dac" | sudo tee -a $CONFIG

            ASK_TO_REBOOT=true

        fi



        if [ -e $BLACKLIST ]; then

            newline

            echo "Commenting out Blacklist entry in "

            echo "$BLACKLIST"

            sudo sed -i -e "s|^blacklist[[:space:]]*i2c-bcm2708.*|#blacklist i2c-bcm2708|" \

                        -e "s|^blacklist[[:space:]]*snd-soc-pcm512x.*|#blacklist snd-soc-pcm512x|" \

                        -e "s|^blacklist[[:space:]]*snd-soc-wm8804.*|#blacklist snd-soc-wm8804|" $BLACKLIST &> /dev/null

        fi

    else

        newline

        echo "No Device Tree Detected, not supported"

        newline

        exit 1

    fi



    if [ -e $CONFIG ] && grep -q -E "^dtparam=audio=on$" $CONFIG; then

        bcm2835off="no"

        newline

        echo "Disabling default sound driver"

        sudo sed -i "s|^dtparam=audio=on$|#dtparam=audio=on|" $CONFIG &> /dev/null

        if [ -e $LOADMOD ] && grep -q "^snd-bcm2835" $LOADMOD; then

            sudo sed -i "s|^snd-bcm2835|#snd-bcm2835|" $LOADMOD &> /dev/null

        fi

        ASK_TO_REBOOT=true

    elif [ -e $LOADMOD ] && grep -q "^snd-bcm2835" $LOADMOD; then

        bcm2835off="no"

        newline

        echo "Disabling default sound module"

        sudo sed -i "s|^snd-bcm2835|#snd-bcm2835|" $LOADMOD &> /dev/null

        ASK_TO_REBOOT=true

    else

        newline

        echo "Default sound driver currently not loaded"

        bcm2835off="yes"

    fi



    echo "Configuring sound output"

    if [ -e /etc/asound.conf ]; then

        if [ -e /etc/asound.conf.old ]; then

            sudo rm -f /etc/asound.conf.old

        fi

        sudo mv /etc/asound.conf /etc/asound.conf.old

    fi

    sudo echo -e "pcm.raspiaudio{\ntype softvol\n" > ~/asound.conf

    sudo echo -e "slave.pcm \042plughw:0\042\n " >> ~/asound.conf

    sudo echo -e "control.name \042Master\042\n " >> ~/asound.conf

    sudo echo -e "control.card 0 }" >>~/asound.conf

    sudo echo -e " pcm.!default { \n" >>~/asound.conf

    sudo echo -e "type plug \n" >>~/asound.conf

    sudo echo -e "slave.pcm  \042raspiaudio\042 \n}\n" >>~/asound.conf



    sudo mv ~/asound.conf /etc/asound.conf



    if [ $bcm2835off == "yes" ]; then

        newline

        echo "We can now test your $productname"

        warning "Set your speakers at a low volume!"

        if confirm "Do you wish to test your system now?"; then

            echo "Testing..."

            speaker-test -l5 -c2 -t wav

        fi

    fi

    newline && success "All done!" && newline

    echo "Enjoy your new $productname!" && newline



    if [ $promptreboot == "yes" ] || $ASK_TO_REBOOT; then

        sysreboot

    fi

else

    newline

    echo "Aborting..."

    newline

fi



exit 0