swap mount additions in revamp

[feisty_meow.git] / scripts / system / add_swap_mount.sh

diff --git a/scripts/system/add_swap_mount.sh b/scripts/system/add_swap_mount.sh
index 2577f44ae4f653164dbd109d4e3449d6b75c417f..f1c019ea51389a355deaa22793d32755a871663c 100644 (file)
--- a/scripts/system/add_swap_mount.sh
+++ b/scripts/system/add_swap_mount.sh
@@ -4,20 +4,48 @@
 export WORKDIR="$( \cd "$(\dirname "$0")" && /bin/pwd )"  # obtain the script's working directory.
 source "$WORKDIR/../core/launch_feisty_meow.sh"
 
-#hmmm: should be able to add a new swap drive if desired.
-
-#hmmm: why all the hard-coded paths below?
-
-/bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=2048
+if [[ $EUID != 0 ]]; then
+  echo "This script must be run as root or sudo."
+  exit 1
+fi
+
+# optional parameters: the instance number of the swap file (best as a number),
+# and the size of the swap file to add.
+SWAP_INSTANCE="$1"; shift
+SWAP_SIZE="$1"; shift
+
+if [ "$SWAP_INSTANCE" == "--help" ]; then
+  echo "\
+This script will add a swap partition for Linux that uses hard drive space for
+swap memory.  This increases the amount of available memory on RAM constrained
+systems.  It accepts two parameters: (1) the instance of the swap file, which
+should be a small number not already used for a swap partition, and (2) the
+size of the swap file in megabytes."
+  exit 1
+fi
+
+# if the swap instance variable is already set, then we'll use it.
+# this allows multiple different swap partitions to be added.
+if [ -z "$SWAP_INSTANCE" ]; then
+  SWAP_INSTANCE=1
+fi
+
+# allow the amount of swap space to be determined from outside the script.
+# this is measured in megabytes.
+if [ -z "$SWAP_SIZE" ]; then
+  SWAP_SIZE=2048
+fi
+
+/bin/dd if=/dev/zero of=/var/swap.${SWAP_INSTANCE} bs=1M count=${SWAP_SIZE}
 test_or_die "creating swap file"
 
-/bin/chmod 600 /var/swap.1
+/bin/chmod 600 /var/swap.${SWAP_INSTANCE}
 test_or_die "setting swap file permissions"
 
-/sbin/mkswap /var/swap.1
+/sbin/mkswap /var/swap.${SWAP_INSTANCE}
 test_or_die "formatting swap file as swap partition"
 
-/sbin/swapon /var/swap.1
+/sbin/swapon /var/swap.${SWAP_INSTANCE}
 test_or_die "enabling new swap partition"
 
 free