/lib/init/swap-functions.sh is in initscripts 2.88dsf-41+deb7u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Functions that assist in turning on swap.
#
# $1 is a string used to log the type of swap expected to be activated
swaponagain() {
#
# Execute swapon command again to pick up any swap partitions
# that have shown up since the last swapon.
#
# Ignore 255 status due to swap already being enabled
#
if [ "$NOSWAP" = yes ]
then
[ "$VERBOSE" = no ] || log_warning_msg "Not activating swap as requested via bootoption noswap."
else
if [ "$VERBOSE" = no ]
then
log_action_begin_msg "Activating $1 swap"
swapon -a -e 2>/dev/null || : # Stifle "Device or resource busy"
log_action_end_msg 0
else
log_daemon_msg "Will now activate $1 swap"
swapon -a -e -v
log_action_end_msg $?
fi
fi
}
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