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Fix swapfile creation for all memory sizes (#2427)

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* Fix swapfile creation for all memory sizes

In certain situation awk prints the swapfile size in scientific
notation. The script can't deal with that, in which case swap file
creation fails.

Use int to convert the number to an integer.

Since pages are 4k, also make sure swapsize is aligned to 4k blocks.

* Add info message
This commit is contained in:
Stefan Agner 2023-03-27 09:34:38 +02:00 committed by GitHub
parent 9cd98003e8
commit 4744a2f123
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1 changed files with 6 additions and 4 deletions
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10
buildroot-external/rootfs-overlay/usr/libexec/haos-swapfile
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@ -2,17 +2,19 @@
set -e
swapfile="/mnt/data/swapfile"
swapsize="$(awk '/MemTotal/{ print $2 * 0.33 }' /proc/meminfo)"
# Swap space in 4k blocks
swapsize="$(awk '/MemTotal/{ print int($2 * 0.33 / 4) }' /proc/meminfo)"
if [ ! -s "${swapfile}" ] || [ "$(stat "${swapfile}" -c '%s')" -lt $((swapsize * 1024)) ]; then
if [ ! -s "${swapfile}" ] || [ "$(stat "${swapfile}" -c '%s')" -lt $((swapsize * 4096)) ]; then
# Check free space (in 4k blocks)
if [ "$(stat -f /mnt/data -c '%f')" -lt $((swapsize / 4)) ]; then
if [ "$(stat -f /mnt/data -c '%f')" -lt "${swapsize}" ]; then
echo "[WARNING] Not enough space to allocate swapfile"
exit 1
fi
dd if=/dev/zero of="${swapfile}" bs=1k count="${swapsize}"
echo "[INFO] Creating swapfile of size $((swapsize *4))k"
dd if=/dev/zero of="${swapfile}" bs=4k count="${swapsize}"
fi
if ! swaplabel "${swapfile}" > /dev/null 2>&1; then