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swapctl.sh : added support to update fstab

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Pieds-Nus 2022-09-19 21:56:30 +00:00
parent 1c4e7f3817
commit d06e0d3abe
1 changed files with 59 additions and 9 deletions
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68
swapctl.sh
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@ -1,5 +1,6 @@
#!/bin/bash
sep="\n\t#############\n"
usage="$0 -d DIR -n NAME -s SIZE -p PRIO add|remove
Add or remove swapfiles to micro-manage disk usage.
-d DIR : set DIRectory to place swapfile in. Default: /mnt
@ -8,13 +9,17 @@ Add or remove swapfiles to micro-manage disk usage.
-p PRIO : Priority to use with swapon. Range from 0 to 1000. Default: 500
-h : Display this help and exit."
test $# -eq 0 && ( echo -e "$usage" ; echo "You must provide either 'add' or 'remove' !" ; exit 1 )
if test $# -eq 0 ; then
echo -e "$usage"
echo "You must provide either 'add' or 'remove' !"
exit 1
fi
SWAP_FOLDER="/mnt"
SWAP_FILENAME="swapfile"
SWAP_SIZE="12" #in MB
SWAP_PRIO_MAX=500 #range 0..1000
SWAP_PRIO_INC=10
SWAP_SIZE="1024" #in MB
SWAP_PRIO_MAX=750 #range 0..1000
SWAP_PRIO_INC=50
while getopts hp:s:n:d: arg ; do
case $arg in
@ -33,15 +38,16 @@ if test "$1" = "add" ; then
N=$(ls $SWAP_FOLDER/$SWAP_FILENAME* | wc -l)
swapfile=$SWAP_FOLDER/$SWAP_FILENAME$N
prio=$((($SWAP_PRIO_MAX - $N * $SWAP_PRIO_INC)))
echo "Creating swapfile: $swapfile"
echo -e "$sep Creating swapfile: $swapfile$sep"
sudo dd if=/dev/urandom of=$swapfile bs=1M count=$SWAP_SIZE status=progress
sudo chmod 0600 $swapfile
sudo mkswap $swapfile
sudo swapon -p $((($SWAP_PRIO_MAX - $N * $SWAP_PRIO_INC))) $swapfile
sudo swapon -p $prio $swapfile
echo -e "\n\n\n\n"
echo -e "\n\n"
sudo swapon
elif test "$1" = "remove" ; then
@ -49,11 +55,55 @@ elif test "$1" = "remove" ; then
N=$(ls $SWAP_FOLDER/$SWAP_FILENAME* | wc -l)
swapfile=$SWAP_FOLDER/$SWAP_FILENAME$((($N - 1)))
echo "Removing swapfile: $swapfile"
echo -e "$sep Removing swapfile: $swapfile$sep"
sudo swapoff $swapfile && sudo rm $swapfile
echo -e "\n\n\n\n"
echo -e "\n\n"
sudo swapon
fi
echo -e "$sep Editing /etc/fstab accordingly$sep"
tmpfile=/tmp/swapctl.fstab
if test $1 = "add" ; then
cat /etc/fstab > $tmpfile
echo -e "$swapfile\t\t\t\t\t\t\t\t\tnone\t\t\tswap\tsw,pri=$prio\t\t\t0\t\t0" >> $tmpfile
else
cat /etc/fstab | grep -v $swapfile > $tmpfile
fi
echo -e "# The lines below this one will be the new fstab file : \n\n $(cat $tmpfile)" | more
while true ; do
echo -e "$sep What to do with this fstab ?"
echo -e "[ \t\e[4ma\\e[0mccept changes | \e[4me\e[0mdit file | dis\e[4mc\e[0mard changes | show \e[4md\e[0miff ]"
read prompt
case $prompt in
a|accept)
sudo mv /etc/fstab.2 /etc/fstab.3
sudo mv /etc/fstab.1 /etc/fstab.2
sudo mv /etc/fstab /etc/fstab.1
sudo mv $tmpfile /etc/fstab
echo -e "$sep Changes accepted. New contents of /etc/fstab :$sep"
cat /etc/fstab | more
break
;;
e|edit)
${EDITOR:-nano} $tmpfile
;;
c|discard)
echo "$sep Changes discarded. /etc/fstab remains unchanged.$sep"
break
;;
d|diff)
echo -e "\n\n\tdiff\t\t/etc/fstab\t\t\t\t\t\t/tmp/swapctl.fstab\n"
diff --tabsize=4 -E -Z -b -t -y /etc/fstab /tmp/swapctl.fstab | more
;;
esac
done