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140 lines
2.7 KiB
Bash
140 lines
2.7 KiB
Bash
#!/bin/bash
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print_usage() {
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echo 'Usage: ExtendPersistentImg.sh file size'
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echo ' file persistent dat file'
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echo ' size extend size in MB'
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echo 'Example:'
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echo ' sh ExtendPersistentImg.sh ubuntu.dat 2048'
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echo ''
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}
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if [ -z "$1" -o "$1" = "-h" ]; then
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print_usage
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exit 1
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fi
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if [ -z "$2" ]; then
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print_usage
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exit 1
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fi
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if [ "$1" = "__vbash__" ]; then
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shift
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else
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if readlink /bin/sh | grep -q bash; then
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:
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else
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exec /bin/bash $0 "__vbash__" "$@"
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fi
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fi
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file=$1
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size=$2
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if [ ! -f "$file" ]; then
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echo "$file not exist."
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exit 1
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fi
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if echo $size | grep -q "^-"; then
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mode="Shrink"
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size=${size:1}
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else
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mode="Extend"
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fi
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if echo $size | grep -q "[^0-9]"; then
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print_usage
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exit 1
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fi
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fsize=$(stat -c '%s' $file)
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fsmod=$(expr $fsize % 1024)
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if [ $fsmod -ne 0 ]; then
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echo "File size of $file is not aligned by 1MB, please check."
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exit 1
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fi
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fsMB=$(expr $fsize / 1024 / 1024)
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if [ "$mode" = "Extend" ]; then
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total=$(expr $fsMB + $size)
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else
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if [ $fsMB -le $size ]; then
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echo "File size of $file is less than ${size}MB."
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exit 1
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fi
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total=$(expr $fsMB - $size)
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fi
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magic=$(hexdump -n3 -e '3/1 "%02X"' $file)
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if [ "$magic" = "584653" ]; then
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if [ "$mode" = "Shrink" ]; then
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echo "Shrink is not supported for XFS filesystem."
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exit 1
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fi
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if which xfs_growfs >/dev/null 2>&1; then
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cmd=xfs_growfs
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else
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echo 'xfs_growfs not found, please install xfsprogs first'
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exit 1
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fi
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else
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if which resize2fs >/dev/null 2>&1; then
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cmd=resize2fs
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else
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echo 'resize2fs not found, please install e2fsprogs first'
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exit 1
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fi
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fi
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if [ "$mode" = "Extend" ]; then
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echo "$mode dat file... (current is ${fsMB}MB, append ${size}MB, total ${total}MB)"
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dd if=/dev/zero bs=1M count=$size status=none >> "$file"
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sync
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else
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echo "$mode dat file... (current is ${fsMB}MB, reduce ${size}MB, finally ${total}MB)"
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fi
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freeloop=$(losetup -f)
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losetup $freeloop "$file"
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if [ "$cmd" = "resize2fs" ]; then
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echo "$mode ext filesystem by resize2fs ..."
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echo "resize2fs $freeloop ${total}M"
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e2fsck -f $freeloop
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resize2fs $freeloop ${total}M
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ret=$?
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else
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echo "$mode xfs filesystem by xfs_growfs ..."
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tmpdir=$(mktemp -d)
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mount $freeloop $tmpdir
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xfs_growfs $freeloop
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ret=$?
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umount $tmpdir && rm -rf $tmpdir
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fi
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losetup -d $freeloop
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if [ $ret -eq 0 -a "$mode" = "Shrink" ]; then
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echo "truncate persistent file ..."
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truncate "$file" -s ${total}M
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ret=$?
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fi
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echo ""
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if [ $ret -eq 0 ]; then
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echo "======= SUCCESS ========="
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else
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echo "======= FAILED ========="
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fi
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echo ""
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