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1 #!/bin/bash | 1 #!/bin/bash |
2 | 2 |
3 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved. | 3 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved. |
4 # Use of this source code is governed by a BSD-style license that can be | 4 # Use of this source code is governed by a BSD-style license that can be |
5 # found in the LICENSE file. | 5 # found in the LICENSE file. |
6 | 6 |
7 # Determine script directory | 7 # Determine script directory |
8 SCRIPT_DIR=$(dirname $0) | 8 SCRIPT_DIR=$(dirname $0) |
9 PROG=$(basename $0) | 9 PROG=$(basename $0) |
10 GPT=cgpt | 10 GPT=cgpt |
11 | 11 |
12 # List of Temporary files and mount points. | 12 # List of Temporary files and mount points. |
13 TEMP_FILE_LIST=$(mktemp) | 13 TEMP_FILE_LIST=$(mktemp) |
14 TEMP_DIR_LIST=$(mktemp) | 14 TEMP_DIR_LIST=$(mktemp) |
15 | 15 |
16 # Read GPT table to find the starting location of a specific partition. | 16 # Read GPT table to find the starting location of a specific partition. |
17 # Args: DEVICE PARTNUM | 17 # Args: DEVICE PARTNUM |
18 # Returns: offset (in sectors) of partition PARTNUM | 18 # Returns: offset (in sectors) of partition PARTNUM |
19 partoffset() { | 19 partoffset() { |
20 sudo $GPT show -b -i $2 $1 | 20 sudo $GPT show -b -i $2 $1 |
21 } | 21 } |
22 | 22 |
23 # Read GPT table to find the size of a specific partition. | 23 # Read GPT table to find the size of a specific partition. |
24 # Args: DEVICE PARTNUM | 24 # Args: DEVICE PARTNUM |
25 # Returns: size (in sectors) of partition PARTNUM | 25 # Returns: size (in sectors) of partition PARTNUM |
26 partsize() { | 26 partsize() { |
27 sudo $GPT show -s -i $2 $1 | 27 sudo $GPT show -s -i $2 $1 |
28 } | 28 } |
29 | 29 |
| 30 # Mount a partition read-only from an image into a local directory |
| 31 # Args: IMAGE PARTNUM MOUNTDIRECTORY |
| 32 mount_image_partition_ro() { |
| 33 local image=$1 |
| 34 local partnum=$2 |
| 35 local mount_dir=$3 |
| 36 local offset=$(partoffset "$image" "$partnum") |
| 37 sudo mount -o loop,ro,offset=$((offset * 512)) "$image" "$mount_dir" |
| 38 } |
| 39 |
30 # Mount a partition from an image into a local directory | 40 # Mount a partition from an image into a local directory |
31 # Args: IMAGE PARTNUM MOUNTDIRECTORY | 41 # Args: IMAGE PARTNUM MOUNTDIRECTORY |
32 mount_image_partition() { | 42 mount_image_partition() { |
33 local image=$1 | 43 local image=$1 |
34 local partnum=$2 | 44 local partnum=$2 |
35 local mount_dir=$3 | 45 local mount_dir=$3 |
36 local offset=$(partoffset "$image" "$partnum") | 46 local offset=$(partoffset "$image" "$partnum") |
37 sudo mount -o loop,offset=$((offset * 512)) "$image" "$mount_dir" | 47 sudo mount -o loop,offset=$((offset * 512)) "$image" "$mount_dir" |
38 } | 48 } |
39 | 49 |
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86 sudo umount -d $i 2>/dev/null | 96 sudo umount -d $i 2>/dev/null |
87 rm -rf $i | 97 rm -rf $i |
88 fi | 98 fi |
89 done | 99 done |
90 set -e | 100 set -e |
91 rm -rf $TEMP_DIR_LIST $TEMP_FILE_LIST | 101 rm -rf $TEMP_DIR_LIST $TEMP_FILE_LIST |
92 } | 102 } |
93 | 103 |
94 trap "cleanup_temps_and_mounts" EXIT | 104 trap "cleanup_temps_and_mounts" EXIT |
95 | 105 |
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