b86cfabd17
Also resize existing swap file, if necessary. Note that if the user allocates more than what we expect, we don't do anything. Fixes #277
62 lines
3.2 KiB
Bash
Executable File
62 lines
3.2 KiB
Bash
Executable File
#!/bin/bash
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set -eu -o pipefail
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readonly USER_HOME="/home/yellowtent"
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readonly APPS_SWAP_FILE="/apps.swap"
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readonly USER_DATA_FILE="/root/user_data.img"
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readonly USER_DATA_DIR="/home/yellowtent/data"
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# detect device of rootfs (http://forums.fedoraforum.org/showthread.php?t=270316)
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disk_device="$(for d in $(find /dev -type b); do [ "$(mountpoint -d /)" = "$(mountpoint -x $d)" ] && echo $d && break; done)"
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# all sizes are in mb
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readonly physical_memory=$(LC_ALL=C free -m | awk '/Mem:/ { print $2 }')
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readonly swap_size=$((${physical_memory} > 4096 ? 4096 : ${physical_memory})) # min(RAM, 4GB) if you change this, fix enoughResourcesAvailable() in client.js
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readonly app_count=$((${physical_memory} / 200)) # estimated app count
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readonly disk_size_bytes=$(LC_ALL=C df | grep "${disk_device}" | awk '{ printf $2 }')
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readonly disk_size=$((${disk_size_bytes}/1024))
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readonly system_size=10240 # 10 gigs for system libs, apps images, installer, box code, data and tmp
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readonly ext4_reserved=$((disk_size * 5 / 100)) # this can be changes using tune2fs -m percent /dev/vda1
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echo "Disk device: ${disk_device}"
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echo "Physical memory: ${physical_memory}"
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echo "Estimated app count: ${app_count}"
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echo "Disk size: ${disk_size}M"
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# Allocate swap for general app usage
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readonly current_swap=$(swapon --show="name,size" --noheadings --bytes | awk 'BEGIN{s=0}{s+=$2}END{printf "%.0f", s/1024/1024}')
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readonly needed_swap_size=$((swap_size - current_swap))
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if [[ ${needed_swap_size} -gt 0 ]]; then
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echo "Need more swap of ${needed_swap_size}M"
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# compute size of apps.swap ignoring what is already set
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without_apps_swap=$(swapon --show="name,size" --noheadings --bytes | awk 'BEGIN{s=0}{if ($1!="/apps.swap") s+=$2}END{printf "%.0f", s/1024/1024}')
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apps_swap_size=$((swap_size - without_apps_swap))
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echo "Creating Apps swap file of size ${apps_swap_size}M"
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if [[ -f "${APPS_SWAP_FILE}" ]]; then
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echo "Swapping off before resizing swap"
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swapoff "${APPS_SWAP_FILE}" || true
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fi
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fallocate -l "${apps_swap_size}m" "${APPS_SWAP_FILE}"
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chmod 600 "${APPS_SWAP_FILE}"
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mkswap "${APPS_SWAP_FILE}"
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swapon "${APPS_SWAP_FILE}"
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if ! grep -q "${APPS_SWAP_FILE}" /etc/fstab; then
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echo "Adding swap to fstab"
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echo "${APPS_SWAP_FILE} none swap sw 0 0" >> /etc/fstab
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fi
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else
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echo "Swap requirements already met"
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fi
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# see start.sh for the initial default size of 8gb. On small disks the calculation might be lower than 8gb resulting in a failure to resize here.
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echo "Resizing data volume"
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home_data_size=$((disk_size - system_size - swap_size - ext4_reserved))
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echo "Resizing up btrfs user data to size ${home_data_size}M"
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umount "${USER_DATA_DIR}" || true
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# Do not preallocate (non-sparse). Doing so overallocates for data too much in advance and causes problems when using many apps with smaller data
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# fallocate -l "${home_data_size}m" "${USER_DATA_FILE}" # does not overwrite existing data
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truncate -s "${home_data_size}m" "${USER_DATA_FILE}" # this will shrink it if the file had existed. this is useful when running this script on a live system
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mount -t btrfs -o loop,nosuid "${USER_DATA_FILE}" ${USER_DATA_DIR}
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btrfs filesystem resize max "${USER_DATA_DIR}"
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