linux-image-manager/scripts/base.sh

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#!/bin/bash
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#
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# This script contains the global program variables and functions
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#
# shellcheck disable=SC2034 #Deactivate checking of unused variables
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# shellcheck disable=SC2003 #Deactivate "expr is antiquated"
# shellcheck disable=SC2015 #Deactivate bool hint
# shellcheck disable=SC2005 #Remove useless echo hint
# shellcheck disable=SC2010 #Deactivate ls | grep hint
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REPOSITORY_PATH="$(readlink -f "${0}" | sed -e 's/\/scripts\/.*//g')"
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CONFIGURATION_PATH="$REPOSITORY_PATH""/configuration/"
PACKAGE_PATH="$CONFIGURATION_PATH""packages/"
TEMPLATE_PATH="$CONFIGURATION_PATH""templates/";
HOME_TEMPLATE_PATH="$TEMPLATE_PATH""home/";
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ENCRYPTED_PATH="$REPOSITORY_PATH/.encrypted";
DECRYPTED_PATH="$REPOSITORY_PATH/decrypted";
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SCRIPT_PATH="$REPOSITORY_PATH/scripts/";
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DATA_PATH="$DECRYPTED_PATH/data";
BACKUP_PATH="$DECRYPTED_PATH/backup";
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COLOR_RED=$(tput setaf 1)
COLOR_GREEN=$(tput setaf 2)
COLOR_YELLOW=$(tput setaf 3)
COLOR_BLUE=$(tput setaf 4)
COLOR_MAGENTA=$(tput setaf 5)
COLOR_CYAN=$(tput setaf 6)
COLOR_WHITE=$(tput setaf 7)
COLOR_RESET=$(tput sgr0)
# FUNCTIONS
message(){
echo "$1[$2]:${COLOR_RESET} $3 ";
}
question(){
message "${COLOR_MAGENTA}" "QUESTION" "$1";
}
info(){
message "${COLOR_BLUE}" "INFO" "$1";
}
warning(){
message "${COLOR_YELLOW}" "WARNING" "$1";
}
success(){
message "${COLOR_GREEN}" "SUCCESS" "$1";
}
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error(){
if [ -z "$1" ]
then
message="Failed."
else
message="$1"
fi
message "${COLOR_RED}" "ERROR" "$message -> Leaving program."
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if declare -f "destructor" > /dev/null
then
info "Calling destructor..."
destructor
else
warning "No destructor defined."
info "Can be that this script left some waste."
fi
exit 1;
}
# Routine to echo the full sd-card-path
set_device_path(){
info "Available devices:"
ls -lasi /dev/ | grep -E "sd|mm"
question "Please type in the name of the device: /dev/" && read -r device
device_path="/dev/$device"
if [ ! -b "$device_path" ]
then
error "$device_path is not valid device."
fi
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info "Device path set to: $device_path"
# @see https://www.heise.de/ct/hotline/Optimale-Blockgroesse-fuer-dd-2056768.html
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PHYSICAL_BLOCK_SIZE_PATH="/sys/block/$device/queue/physical_block_size"
if [ -f "$PHYSICAL_BLOCK_SIZE_PATH" ]; then
PHYSICAL_BLOCK_SIZE=$(sudo cat $PHYSICAL_BLOCK_SIZE_PATH)
if [ $? -eq 0 ]; then
OPTIMAL_BLOCKSIZE=$((64 * PHYSICAL_BLOCK_SIZE)) || error
else
echo "Unable to read $PHYSICAL_BLOCK_SIZE_PATH"
OPTIMAL_BLOCKSIZE="4K"
fi
else
OPTIMAL_BLOCKSIZE="4K"
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fi
info "Optimal blocksize set to: $OPTIMAL_BLOCKSIZE" || error
}
overwrite_device() {
question "Should $device_path be overwritten with zeros before copying? (y/N/block count)" && read -r copy_zeros_to_device
case "$copy_zeros_to_device" in
y)
info "Overwriting entire device..." &&
dd if=/dev/zero of="$device_path" bs="$OPTIMAL_BLOCKSIZE" status=progress || error "Overwriting $device_path failed."
;;
N)
info "Skipping Overwriting..."
;;
''|*[!0-9]*)
error "Invalid input."
;;
*)
if [[ "$copy_zeros_to_device" =~ ^[0-9]+$ ]]; then
info "Overwriting $copy_zeros_to_device blocks..." &&
dd if=/dev/zero of="$device_path" bs="$OPTIMAL_BLOCKSIZE" count="$copy_zeros_to_device" status=progress || error "Overwriting $device_path failed."
else
error "Invalid input. Block count must be a number."
fi
;;
esac
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}
get_packages(){
for package_collection in "$@"
do
package_collection_path="$PACKAGE_PATH""$package_collection.txt" &&
echo "$(sed -e "/^#/d" -e "s/#.*//" "$package_collection_path" | tr '\n' ' ')" ||
error
done
}
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HEADER(){
echo
echo "${COLOR_YELLOW}The"
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echo "LINUX IMAGE MANAGER"
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echo "is an administration tool designed from and for Kevin Veen-Birkenbach."
echo
echo "Licensed under GNU GENERAL PUBLIC LICENSE Version 3"
echo "${COLOR_RESET}"
}
HEADER