95 lines
2.5 KiB
Bash
95 lines
2.5 KiB
Bash
#!/bin/sh
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#################################################################################
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# Copyright 2017 Clayton Craft <clayton@craftyguy.net>
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#
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# This file is part of postmarketos-base
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#
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# postmarketos-base is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# postmarketos-base is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this postmarketos-base. If not, see <http://www.gnu.org/licenses/>.
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#################################################################################
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# $1 = swap file location
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function remove_old_swap() {
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local _swap_file=$1
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swapoff ${_swap_file} 2>/dev/null
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rm ${_swap_file}
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if [ -e ${_swap_file} ]; then
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echo "Unable to remove old swap file!"
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exit 1
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fi
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}
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# $1 = swap file location
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# $2 = swap file size
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function make_swap() {
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local _swap_file=$1
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local _swap_size=$2
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# Allocate space on disk for swap
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fallocate -l ${_swap_size}M ${_swap_file}
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# Set correct file permissions for swap file
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chown root:root ${_swap_file}
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chmod 600 ${_swap_file}
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#format swap file
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mkswap ${_swap_file} 1>/dev/null
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}
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if [ "$(id -u)" != "0" ]; then
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echo "This script can only be run as root"
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exit 1
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fi
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config=/etc/conf.d/swapfile
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if [ ! -f ${config} ]; then
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echo "Unable to find config at: ${config}"
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exit 1
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fi
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# deviceinfo is a pmOS-specific thing, but it's not *required*
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. /usr/share/misc/source_deviceinfo
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source /etc/conf.d/swapfile
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# Configure swap size. Size is in MB
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# If size in config is unset then use value from deviceinfo,
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# or default to 0 if neither is set
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if [ -z "${swap_size}" ]; then
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if [ -n "${deviceinfo_swap_size_recommended}" ]; then
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swap_size=${deviceinfo_swap_size_recommended}
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else
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swap_size=0
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fi
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fi
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if [ "${swap_size}" == "0" ]; then
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echo "Configured swap file size is 0, skipping creation."
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exit 0
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fi
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swap_file="${swap_file:-/swapfile}"
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echo "Setting up swap file of size ${swap_size}MB at ${swap_file}..."
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# Clean up old swap file
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if [ -f ${swap_file} ]; then
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remove_old_swap ${swap_file}
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fi
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# Create swap file
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make_swap ${swap_file} ${swap_size}
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# Activate swap file
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swapon ${swap_file}
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echo "Successfully activated swap file!"
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exit 0
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