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#!/bin/sh
set -e
. /etc/default/swapfile
# check defaults
[ -n "$SIZE" ] || exit 0
[ -n "$FILE" ] || exit 0
create_swapfile() {
local FILE=$1
local SIZE=$2
fallocate -l $((1024*1024*SIZE)) "$FILE"
mkswap "$FILE" >/dev/null 2>&1
chmod 0600 "$FILE"
}
delete_swapfile() {
if grep -q "$FILE" /proc/swaps; then
swapoff "$1"
fi
rm -f "$1"
}
# SIZE is zero (or smaller), drop out
# (and delete possibly existing file)
if [ "$SIZE" -le "0" ]; then
[ -e "$FILE" ] && delete_swapfile "$FILE"
exit 0
fi
# file does not exist, create it
if [ ! -e "$FILE" ]; then
create_swapfile "$FILE" "$SIZE"
fi
# file exists but has the wrong size
if [ "$(stat -c %s "$FILE")" -ne "$((1024*1024*SIZE))" ]; then
delete_swapfile "$FILE"
create_swapfile "$FILE" "$SIZE"
fi
# swap on if we aren't already
grep -q "$FILE" /proc/swaps || swapon "$FILE"