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Do not relocate /nix and /tmp to small disks on AWS

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The default behavior with an m3.medium instance is to relocate
/nix and /tmp to /disk0 because an assumption is made that any
ephemeral disk is larger than the root volume.  Rather than make
that assumption, add a check to see if the disk is larger, and
only then relocate /nix and /tmp.

This addresses https://github.com/NixOS/nixpkgs/issues/12613
This commit is contained in:
cransom user 2016-02-02 01:40:41 +00:00
parent 58046b7f03
commit f10bead8fd
1 changed files with 5 additions and 1 deletions
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6
nixos/modules/virtualisation/amazon-image.nix
View file

@ -68,7 +68,11 @@ let cfg = config.ec2; in
diskNr=$((diskNr + 1))
echo "mounting $device on $mp..."
if mountFS "$device" "$mp" "" ext3; then
if [ -z "$diskForUnionfs" ]; then diskForUnionfs="$mp"; fi
if [ -z "$diskForUnionfs" -a \
$(lsblk -bno size $device) -gt $(lsblk -bno size /dev/xvda1)
]; then
diskForUnionfs="$mp";
fi
fi
else
echo "skipping unknown device type $device"