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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0+
# Copyright (C) 2020 Denis 'GNUtoo' Carikli
line_length=81
printchar()
{
char="$1"
nr_chars="$2"
if [ -z "${nr_chars}" ] ; then
echo -n "${char}"
else
i=0
while [ $i -lt ${nr_chars} ] ; do
echo -n "${char}"
i=$(expr $i + 1)
done
fi
}
print_separation_line()
{
echo -n "+"
printchar "-" $(expr ${line_length} - 2)
echo "+"
}
strlen()
{
echo $(expr $(echo "$1" | wc -c) - 1)
}
print_header()
{
pkgname="$1"
# ${line_length}
# - '| '
# - ${pkgname}
# - ' '
# - 'installation instructions:'
# - ' |'
extra_spaces=$(expr ${line_length} - 2 - $(strlen "${pkgname}") - 1)
extra_spaces=$(expr ${extra_spaces} - \
$(strlen "installation instructions:") - 2)
print_separation_line
echo -n "| "
echo -n "${pkgname} installation instructions:"
printchar " " "${extra_spaces}"
echo " |"
print_separation_line
}
print_line()
{
line="$1"
# ${line_length} - '| ' - ${line} - ' |'
extra_spaces=$(expr ${line_length} - 2 - $(strlen "${line}") - 2)
echo -n '| '
echo -n "${line}"
printchar " " "${extra_spaces}"
echo ' |'
}
print_text()
{
for line in "$@" ; do
print_line "${line}"
done
}
print_introduction()
{
print_text \
"To boot with u-boot you will need to do two things:" \
"- First you will need to install u-boot to the storage device (like" \
" a microSD) you will be booting from. You can consult the Parabola" \
" installation instructions to know which storage devices are" \
" supported." \
"- Then you will need to read and potentially modify the" \
" /boot/extlinux/extlinux.conf configuration file to tell u-boot" \
" from which kernel to boot, and various other settings related to" \
" booting (like LVM or disk encryption settings)."
}
print_uboot_install_instructions()
{
pkgname="$1"
install_script="$2"
print_text \
"To install or upgrade u-boot you can use similar commands:" \
" cd $(dirname ${script})" \
" sudo ./$(basename ${script}) <path/to/block-device>"
print_line ""
print_text \
"For instance if the microSD you (will) boot from is available at" \
"/dev/mmcblk0 you can use the following commands:" \
" cd $(dirname ${script})" \
" sudo ./$(basename ${script}) /dev/mmcblk0"
print_line ""
print_text \
"Instead if the microSD is available at /dev/sdb you can use the" \
"following commands:" \
" cd $(dirname ${script})" \
" sudo ./$(basename ${script}) /dev/sdb"
}
print_extlinux_config_remainder()
{
pkgbase="$1"
print_text \
"When this is done you'll need to create and/or modify the" \
"/boot/extlinux/extlinux.conf configuration file."
print_line ""
print_text \
"There is an example file for that at" \
"/usr/lib/u-boot/${pkgbase}/extlinux.conf"
}
pkgname="$1"
pkgbase="$2"
script="$3"
print_header "${pkgname}"
print_introduction
print_line " "
print_uboot_install_instructions "${pkgname}" "${script}"
print_line " "
print_extlinux_config_remainder "${pkgbase}"
print_separation_line
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