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Merge pull request #16755 from bjornfor/swapfile-resize

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nixos/swap: support for resizing swapfile
This commit is contained in:
Eelco Dolstra 2016-07-06 17:06:43 +02:00 committed by GitHub
commit 0d5be595a7
1 changed files with 6 additions and 3 deletions
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9
nixos/modules/config/swap.nix
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@ -30,8 +30,7 @@ let
description = ''
If this option is set, ‘device’ is interpreted as the
path of a swapfile that will be created automatically
with the indicated size (in megabytes) if it doesn't
exist.
with the indicated size (in megabytes).
'';
};
@ -132,9 +131,13 @@ in
script =
''
${optionalString (sw.size != null) ''
if [ ! -e "${sw.device}" ]; then
currentSize=$(( $(stat -c "%s" "${sw.device}" 2>/dev/null || echo 0) / 1024 / 1024 ))
if [ "${toString sw.size}" != "$currentSize" ]; then
fallocate -l ${toString sw.size}M "${sw.device}" ||
dd if=/dev/zero of="${sw.device}" bs=1M count=${toString sw.size}
if [ "${toString sw.size}" -lt "$currentSize" ]; then
truncate --size "${toString sw.size}M" "${sw.device}"
fi
chmod 0600 ${sw.device}
${optionalString (!sw.randomEncryption) "mkswap ${sw.realDevice}"}
fi