mirror of
https://github.com/Telecominfraproject/OpenCellular.git
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395d9c6e41
If we just want to read the current lsb-release, we shouldn't need to break rootfs verification. Change-Id: I5ba6ddbd9f5801783a568b6806392184b683f628 BUG=none TEST=none Review URL: http://codereview.chromium.org/3563001
106 lines
2.8 KiB
Bash
Executable File
106 lines
2.8 KiB
Bash
Executable File
#!/bin/bash
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# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# Determine script directory
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SCRIPT_DIR=$(dirname $0)
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PROG=$(basename $0)
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GPT=cgpt
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# List of Temporary files and mount points.
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TEMP_FILE_LIST=$(mktemp)
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TEMP_DIR_LIST=$(mktemp)
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# Read GPT table to find the starting location of a specific partition.
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# Args: DEVICE PARTNUM
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# Returns: offset (in sectors) of partition PARTNUM
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partoffset() {
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sudo $GPT show -b -i $2 $1
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}
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# Read GPT table to find the size of a specific partition.
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# Args: DEVICE PARTNUM
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# Returns: size (in sectors) of partition PARTNUM
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partsize() {
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sudo $GPT show -s -i $2 $1
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}
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# Mount a partition read-only from an image into a local directory
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# Args: IMAGE PARTNUM MOUNTDIRECTORY
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mount_image_partition_ro() {
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local image=$1
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local partnum=$2
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local mount_dir=$3
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local offset=$(partoffset "$image" "$partnum")
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sudo mount -o loop,ro,offset=$((offset * 512)) "$image" "$mount_dir"
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}
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# Mount a partition from an image into a local directory
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# Args: IMAGE PARTNUM MOUNTDIRECTORY
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mount_image_partition() {
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local image=$1
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local partnum=$2
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local mount_dir=$3
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local offset=$(partoffset "$image" "$partnum")
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sudo mount -o loop,offset=$((offset * 512)) "$image" "$mount_dir"
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}
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# Extract a partition to a file
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# Args: IMAGE PARTNUM OUTPUTFILE
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extract_image_partition() {
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local image=$1
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local partnum=$2
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local output_file=$3
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local offset=$(partoffset "$image" "$partnum")
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local size=$(partsize "$image" "$partnum")
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dd if=$image of=$output_file bs=512 skip=$offset count=$size conv=notrunc >/dev/null 2>&1
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}
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# Replace a partition in an image from file
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# Args: IMAGE PARTNUM INPUTFILE
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replace_image_partition() {
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local image=$1
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local partnum=$2
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local input_file=$3
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local offset=$(partoffset "$image" "$partnum")
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local size=$(partsize "$image" "$partnum")
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dd if=$input_file of=$image bs=512 seek=$offset count=$size conv=notrunc
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}
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# Create a new temporary file and return its name.
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# File is automatically cleaned when cleanup_temps_and_mounts() is called.
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make_temp_file() {
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local tempfile=$(mktemp)
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echo "$tempfile" >> $TEMP_FILE_LIST
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echo $tempfile
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}
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# Create a new temporary directory and return its name.
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# Directory is automatically deleted and any filesystem mounted on it unmounted
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# when cleanup_temps_and_mounts() is called.
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make_temp_dir() {
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local tempdir=$(mktemp -d)
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echo "$tempdir" >> $TEMP_DIR_LIST
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echo $tempdir
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}
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cleanup_temps_and_mounts() {
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for i in "$(cat $TEMP_FILE_LIST)"; do
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rm -f $i
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done
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set +e # umount may fail for unmounted directories
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for i in "$(cat $TEMP_DIR_LIST)"; do
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if [ -n "$i" ]; then
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sudo umount -d $i 2>/dev/null
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rm -rf $i
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fi
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done
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set -e
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rm -rf $TEMP_DIR_LIST $TEMP_FILE_LIST
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}
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trap "cleanup_temps_and_mounts" EXIT
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