73 lines
1.9 KiB
Bash
73 lines
1.9 KiB
Bash
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#!/bin/bash
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# Copyright 2019 The gVisor Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This script creates an ext4 image with $1 depth of directories and a file in
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# the inner most directory. The created file is at path /1/2/.../depth/file.txt.
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# The ext4 image is written to $2. The image is temporarily mounted at
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# /tmp/mountpoint. This script must be run with sudo privileges.
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# Usage:
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# sudo bash make_deep_ext4.sh {depth} {output path}
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# Check positional arguments.
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if [ "$#" -ne 2 ]; then
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echo "Usage: sudo bash make_deep_ext4.sh {depth} {output path}"
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exit 1
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fi
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# Make sure depth is a non-negative number.
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if ! [[ "$1" =~ ^[0-9]+$ ]]; then
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echo "Depth must be a non-negative number."
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exit 1
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fi
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# Create a 1 MB filesystem image at the requested output path.
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rm -f $2
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fallocate -l 1M $2
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if [ $? -ne 0 ]; then
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echo "fallocate failed"
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exit $?
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fi
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# Convert that blank into an ext4 image.
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mkfs.ext4 -j $2
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if [ $? -ne 0 ]; then
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echo "mkfs.ext4 failed"
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exit $?
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fi
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# Mount the image.
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MOUNTPOINT=/tmp/mountpoint
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mkdir -p $MOUNTPOINT
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mount -o loop $2 $MOUNTPOINT
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if [ $? -ne 0 ]; then
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echo "mount failed"
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exit $?
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fi
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# Create nested directories and the file.
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if [ "$1" -eq 0 ]; then
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FILEPATH=$MOUNTPOINT/file.txt
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else
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FILEPATH=$MOUNTPOINT/$(seq -s '/' 1 $1)/file.txt
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fi
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mkdir -p $(dirname $FILEPATH) || exit
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touch $FILEPATH
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# Clean up.
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umount $MOUNTPOINT
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rm -rf $MOUNTPOINT
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