From 0ae1da97a8da1f25c8d4cba1135e1f4cc9b17db8 Mon Sep 17 00:00:00 2001
From: Martin Dengler <martin@martindengler.com>
Date: Mon, 29 Jun 2009 21:31:30 +0000
Subject: refactor build process into smaller, more sensible, more restartable scripts

---
(limited to 'make_fake_device.sh')

diff --git a/make_fake_device.sh b/make_fake_device.sh
new file mode 100755
index 0000000..c44a0e0
--- /dev/null
+++ b/make_fake_device.sh
@@ -0,0 +1,71 @@
+#!/bin/bash
+
+set -e
+set -o pipefail
+
+PATH=/usr/sbin:/sbin:$PATH
+
+SAFE_SIZE_4G=3758096384 #3584mb
+SAFE_SIZE_2G=1879048192 #1/2 4g safe size
+SAFE_SIZE_1G=939524096  #1/2 2g safe size
+
+DISK_SIZE=$SAFE_SIZE_4G
+LOOP_DEV=$(losetup -f)
+
+usage() {
+    echo "make_fake_device.sh [--4G|--2G|--1G] <loop device backing store filename>"
+    echo "   outputs a loop device whose backing store is a partitioned disk "
+    echo "   image using a sparse file of the specified size (default is --4G)"
+    exit 1
+}
+
+while [ $# -gt 1 ]; do
+    case $1 in
+        --4G)
+            DISK_SIZE=$SAFE_SIZE_4G
+            shift
+            ;;
+        --2G)
+            DISK_SIZE=$SAFE_SIZE_2G
+            shift
+            ;;
+        --1G)
+            DISK_SIZE=$SAFE_SIZE_2G
+            shift
+            ;;
+        *)
+            usage
+            ;;
+    esac
+done
+IMG=$1
+
+
+BLOCK_SIZE=512
+NUM_HEADS=16
+NUM_SECTORS_PER_TRACK=62
+NUM_BLOCKS=$(($DISK_SIZE / $BLOCK_SIZE))
+NUM_CYLINDERS=$(($NUM_BLOCKS / $NUM_HEADS / $NUM_SECTORS_PER_TRACK))
+IMAGE_SIZE=$(($NUM_CYLINDERS * $NUM_HEADS * $NUM_SECTORS_PER_TRACK * $BLOCK_SIZE))
+OS_PART1_BEGIN=$(($NUM_SECTORS_PER_TRACK * $BLOCK_SIZE))
+
+dd if=/dev/zero of=$IMG bs=$BLOCK_SIZE count=0 seek=$(($IMAGE_SIZE / $BLOCK_SIZE)) > /dev/null 2>&1 || exitclean
+/sbin/fdisk -b $BLOCK_SIZE -C $NUM_CYLINDERS -S $NUM_SECTORS_PER_TRACK -H $NUM_HEADS $IMG  > /dev/null 2>&1 <<EOF
+n
+p
+1
+
+
+t
+83
+p
+w
+q
+EOF
+
+losetup -d $LOOP_DEV > /dev/null 2>&1 || /bin/true
+losetup -o $OS_PART1_BEGIN $LOOP_DEV $IMG
+
+mke2fs -O dir_index -L OLPCRoot -F $LOOP_DEV > /dev/null 2>&1 || exitclean
+echo $LOOP_DEV
+
--
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