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Create swap file only if absent

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Signed-off-by: Guillaume Rose <guillaume.rose@docker.com>
This commit is contained in:
Guillaume Rose 2019-06-07 09:50:49 +02:00
parent ea23fecdee
commit fa1cd40a2a
1 changed files with 17 additions and 13 deletions
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30
pkg/swap/swap.sh
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@ -115,23 +115,27 @@ done
### Required? exit 1
### Else? exit 0
## Allocate the file
dd if=/dev/zero of=$path bs=1024 count=$(disksize_to_count 1024 $size)
chmod 0600 $path
## was it encrypted? use cryptsetup and get the mapped device
if [ "$ENCRYPT" == "true" ]; then
# might need
#loop=$(losetup -f)
#losetup ${loop} ${path}
cryptsetup open --type plain --key-file /dev/urandom --key-size=256 --cipher=aes-cbc-essiv:sha256 --offset=0 ${path} swapfile
SWAPDEV=/dev/mapper/swapfile
else
SWAPDEV=$path
fi
## mkswap and swapon the device
/sbin/mkswap $SWAPDEV
if [ ! -f $path ] || ! [ $(stat -c "%s" $path) == $(disksize_to_count 1 $size) ]; then
## Allocate the file
dd if=/dev/zero of=$path bs=1024 count=$(disksize_to_count 1024 $size)
chmod 0600 $path
## was it encrypted? use cryptsetup and get the mapped device
if [ "$ENCRYPT" == "true" ]; then
# might need
#loop=$(losetup -f)
#losetup ${loop} ${path}
cryptsetup open --type plain --key-file /dev/urandom --key-size=256 --cipher=aes-cbc-essiv:sha256 --offset=0 ${path} swapfile
fi
/sbin/mkswap $SWAPDEV
fi
/sbin/swapon $SWAPDEV