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+#!/usr/bin/env bash
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+#
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+# Copyright (C) 2016 Josua Mayer
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+#
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+# This program is free software; you can redistribute it and/or
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+# modify it under the terms of the GNU General Public License
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+# as published by the Free Software Foundation; either version 2
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+# of the License, or (at your option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program; if not, write to the Free Software
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+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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+#
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+
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+usage() {
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+ echo "$0 <sectors> <outfile> <bootloader> [<type_partitionN> <sectors_partitionN> <img_partitionN>]?"
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+}
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+
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+# always require first 3 arguments
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+# then in pairs up to 8 more for a total of up to 4 partitions
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+if [ $# -lt 3 ] || [ $# -gt 15 ] || [ $(($#%3)) -ne 0 ]; then
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+ usage
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+ exit 1
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+fi
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+
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+set -e
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+
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+# parameters
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+IMGSIZE=$1
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+OUTFILE="$2"
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+BOOTLOADER="$3"
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+
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+# calculate number of partitions from argument list
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+NUMPARTS=$#
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+((NUMPARTS=(NUMPARTS-3)/3))
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+
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+# find required applications
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+FDISK=$(env PATH="/usr/local/sbin:/usr/sbin:/sbin:$PATH" which fdisk)
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+
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+# generate image file
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+printf "Creating $OUTFILE from /dev/zero: "
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+dd if=/dev/zero of="$OUTFILE" bs=512 count=1 >/dev/null
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+printf "Done\n"
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+
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+# generate fdisk argument list
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+printf "Generating fdisk argument list: "
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+ARGSFILE=$(mktemp)
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+
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+# empty partition table
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+printf "o\n" >> $ARGSFILE
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+
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+# actual partitions
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+offset=2048
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+for i in $(seq 1 1 $NUMPARTS); do
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+ ((n=3+3*i-2)); type=$(eval echo \${$n})
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+ ((n=3+3*i-1)); size=$(eval echo \${$n})
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+ ((end=offset+size-1))
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+
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+ printf "n\np\n%i\n\n%i\n" $i $end >> $ARGSFILE
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+
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+ # special case on first aprtition: fdisk wont ask which one
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+ if [ $i -eq 1 ]; then
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+ printf "t\n%s\n" $type >> $ARGSFILE
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+ else
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+ printf "t\n%i\n%s\n" $i $type >> $ARGSFILE
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+ fi
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+
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+ # add this partitions size to offset for next partition
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+ ((offset=end+1))
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+done
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+
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+# write and exit
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+printf "w\n" >> $ARGSFILE
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+
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+printf "Done\n"
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+
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+# create real partition table using fdisk
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+printf "Creating partition table: "
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+cat $ARGSFILE | $FDISK "$OUTFILE" >/dev/null
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+printf "Done\n"
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+
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+# remove temporary files
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+printf "Cleaning up: "
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+rm -f $ARGSFILE
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+printf "Done\n"
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+
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+# install bootloader
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+printf "Writing bootloader: "
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+dd of="$OUTFILE" if="$BOOTLOADER" bs=512 seek=1 conv=notrunc 2>/dev/null
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+printf "Done\n"
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+
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+# write partition data
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+
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+# offset of first partition is 2048
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+offset=2048
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+for i in $(seq 1 1 $NUMPARTS); do
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+ ((n=3+3*i-1)); size=$(eval echo \${$n})
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+ ((n=3+3*i)); img="$(eval echo \${$n})"
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+
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+ printf "Writing %s to partition %i: " "$img" $i
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+ dd if="$img" of="$OUTFILE" bs=512 seek=$offset conv=notrunc 2>/dev/null
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+ printf "Done\n"
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+
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+ # add this partitions size to offset for next partition
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+ ((offset=offset+size))
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+done
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Josua Mayer