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add mdadm support

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This commit is contained in:
lassulus 2022-08-24 16:46:36 +02:00
parent 9bca66ca7d
commit 88cb7a4719
3 changed files with 99 additions and 91 deletions
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47
lib/default.nix
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@ -2,12 +2,7 @@
with lib;
with builtins;
let {
body.config = config-f {};
body.create = create-f {};
body.mount = mount-f {};
let
helper.find-device = device: let
environment = helper.device-id device;
@ -16,14 +11,14 @@ let {
if hasPrefix "/dev/disk" device then
"${environment}='${device}'"
else ''
${environment}=$(for x in /dev/disk/by-path/*; do
${environment}=$(for x in $(find /dev/disk/{by-path,by-id}/); do
dev=$x
if [ "$(readlink -f $x)" = '${device}' ]; then
if [ "$(readlink -f $x)" = "$(readlink -f '${device}')" ]; then
target=$dev
break
fi
done
if test -z $target; then
if test -z ''${target+x}; then
echo 'unable to find path of disk: ${device}, bailing out' >&2
exit 1
else
@ -71,8 +66,23 @@ let {
mkfs.${x.format} ${q.device}
'';
create.devices = q: x: ''
${concatStrings (mapAttrsToList (name: create-f { device = "/dev/${name}"; }) x.content)}
create.devices = q: x: let
raid-devices = lib.filterAttrs (_: dev: dev.type == "mdadm") x.content;
other-devices = lib.filterAttrs (_: dev: dev.type != "mdadm") x.content;
in ''
${concatStrings (mapAttrsToList (name: create-f { device = "/dev/${name}"; }) other-devices)}
${concatStrings (mapAttrsToList (name: create-f { device = "/dev/${name}"; name = name; }) raid-devices)}
'';
create.mdraid = q: x: ''
RAIDDEVICES_N_${x.name}=$((''${RAIDDEVICES_N_${x.name}:-0}+1))
RAIDDEVICES_${x.name}="''${RAIDDEVICES_${x.name}:-}${q.device} "
'';
create.mdadm = q: x: ''
echo 'y' | mdadm --create /dev/md/${q.name} --level=${toString x.level or 1} --raid-devices=''${RAIDDEVICES_N_${q.name}} ''${RAIDDEVICES_${q.name}}
udevadm trigger --subsystem-match=block; udevadm settle
${create-f { device = "/dev/md/${q.name}"; } x.content}
'';
create.luks = q: x: ''
@ -158,6 +168,10 @@ let {
mount.noop = q: x: {};
# TODO maybe we need to do something here?
mount.mdadm = mount.noop;
mount.mdraid = mount.noop;
mount.partition = q: x:
mount-f { device = "\"\${${q.device}}\"-part" + toString q.index; } x.content;
@ -166,4 +180,15 @@ let {
(foldl' recursiveUpdate {} (imap (index: mount-f (q // { inherit index; device = helper.device-id q.device; })) x.partitions))
{table.${q.device} = helper.find-device q.device;}
);
in {
config = config-f {};
create = cfg: ''
set -efux
${create-f {} cfg}
'';
mount = cfg: ''
set -efux
${mount-f {} cfg}
'';
}