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author | Martin Dengler <martin@martindengler.com> | 2009-06-29 21:31:30 (GMT) |
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committer | Martin Dengler <martin@martindengler.com> | 2009-06-30 11:35:31 (GMT) |
commit | 0ae1da97a8da1f25c8d4cba1135e1f4cc9b17db8 (patch) | |
tree | 10e97b686c618c651be009ecb288865145240c25 /make_fake_device.sh | |
parent | 628648f8d89fe8322e2867a5a56a673900683206 (diff) |
refactor build process into smaller, more sensible, more restartable scripts
Diffstat (limited to 'make_fake_device.sh')
-rwxr-xr-x | make_fake_device.sh | 71 |
1 files changed, 71 insertions, 0 deletions
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 + |