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81 lines
1.5 KiB
Bash
81 lines
1.5 KiB
Bash
#!/bin/sh
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size=1024
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fstype=ext4
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label=casper-rw
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print_usage() {
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echo 'Usage: CreatePersistentImg.sh [ -s size ] [ -t fstype ] [ -l LABEL ]'
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echo ' OPTION: (optional)'
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echo ' -s size in MB, default is 1024'
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echo ' -t filesystem type, default is ext4 ext2/ext3/ext4/xfs are supported now'
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echo ' -l label, default is casper-rw'
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echo ''
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}
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while [ -n "$1" ]; do
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if [ "$1" = "-s" ]; then
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shift
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size=$1
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elif [ "$1" = "-t" ]; then
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shift
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fstype=$1
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elif [ "$1" = "-l" ]; then
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shift
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label=$1
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elif [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
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print_usage
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exit 0
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else
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print_usage
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exit 1
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fi
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shift
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done
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# check label
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if [ -z "$label" ]; then
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echo "The label can NOT be empty."
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exit 1
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fi
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# check size
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if echo $size | grep -q "^[0-9][0-9]*$"; then
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if [ $size -le 1 ]; then
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echo "Invalid size $size"
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exit 1
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fi
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else
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echo "Invalid size $size"
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exit 1
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fi
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# check file system type
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# nodiscard must be set for ext2/3/4
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# -K must be set for xfs
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if echo $fstype | grep -q '^ext[234]$'; then
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fsopt='-E nodiscard'
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elif [ "$fstype" = "xfs" ]; then
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fsopt='-K'
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else
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echo "unsupported file system $fstype"
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exit 1
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fi
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# 00->ff avoid sparse file
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dd if=/dev/zero bs=1M count=$size | tr '\000' '\377' > persistence.dat
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sync
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freeloop=$(losetup -f)
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losetup $freeloop persistence.dat
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mkfs -t $fstype $fsopt -L $label $freeloop
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sync
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losetup -d $freeloop
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