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@@ -3,13 +3,17 @@
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set -e
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dev=/dev/xvdb
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+max_size=1073741824 # check at most 1 GiB
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if [ -e "$dev" ] ; then
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# The private /dev/xvdb device is present.
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# check if private.img (xvdb) is empty - all zeros
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- private_size_512=$(blockdev --getsz "$dev")
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- if head -c $(( private_size_512 * 512 )) /dev/zero | diff "$dev" - >/dev/null; then
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+ private_size=$(( $(blockdev --getsz "$dev") * 512))
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+ if [ $private_size -gt $max_size ]; then
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+ private_size=$max_size
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+ fi
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+ if cmp --bytes $private_size "$dev" /dev/zero >/dev/null && { blkid -p "$dev" >/dev/null; [ $? -eq 2 ]; }; then
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# the device is empty, create filesystem
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echo "Virgin boot of the VM: creating private.img filesystem on $dev" >&2
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if ! content=$(mkfs.ext4 -m 0 -q "$dev" 2>&1) ; then
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