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129 lines
2.9 KiB
Bash
129 lines
2.9 KiB
Bash
#!/bin/bash
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size=1024
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fstype=ext4
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label=casper-rw
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config=''
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outputfile=persistence.dat
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print_usage() {
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echo 'Usage: sudo ./CreatePersistentImg.sh [ -s size ] [ -t fstype ] [ -l LABEL ] [ -c CFG ] [ -e ]'
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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 ' -c configfile name inside the persistence file. File content is "/ union"'
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echo ' -o outputfile name, default is persistence.dat'
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echo ' -e enable encryption, disabled by default (only few distros support this)'
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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" = "-c" ]; then
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shift
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config=$1
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elif [ "$1" = "-o" ]; then
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shift
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outputfile=$1
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elif [ "$1" = "-e" ]; then
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read -s -p "Encryption passphrase: " passphrase
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echo
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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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vtMinSize=1
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if echo $fstype | grep -q '^xfs$'; then
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vtMinSize=16
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fi
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if [ $size -lt $vtMinSize ]; then
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echo "size too small ($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 $fstype"
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exit 1
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fi
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if [ "$outputdir" != "persistence.dat" ]; then
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mkdir -p "$(dirname "$outputfile")"
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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=$size | tr '\000' '\377' > "$outputfile"
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sync
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freeloop=$(losetup -f)
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losetup $freeloop "$outputfile"
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if [ ! -z "$passphrase" ]; then
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printf "$passphrase" | cryptsetup -q --verbose luksFormat $freeloop -
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printf "$passphrase" | cryptsetup -q --verbose luksOpen $freeloop persist_decrypted -
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_freeloop=$freeloop
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freeloop="/dev/mapper/persist_decrypted"
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fi
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mkfs -t $fstype $fsopt -L $label $freeloop
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sync
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if [ -n "$config" ]; then
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if [ -d ./persist_tmp_mnt ]; then
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rm -rf ./persist_tmp_mnt
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fi
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mkdir ./persist_tmp_mnt
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if mount $freeloop ./persist_tmp_mnt; then
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echo '/ union' > ./persist_tmp_mnt/$config
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sync
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umount ./persist_tmp_mnt
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fi
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rm -rf ./persist_tmp_mnt
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fi
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if [ ! -z "$passphrase" ]; then
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cryptsetup luksClose $freeloop
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freeloop=$_freeloop
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fi
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losetup -d $freeloop
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