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63 lines
1.6 KiB
JavaScript
63 lines
1.6 KiB
JavaScript
"use strict";
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const Promise = require("bluebird");
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const memoizee = require("memoizee");
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const asExpression = require("as-expression");
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const fs = Promise.promisifyAll(require("fs"));
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const lsblk = require("../../packages/exec-lsblk");
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const All = require("../../packages/graphql-interface/symbols/all");
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const treecutter = require("../../packages/treecutter");
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const findInTree = require("../../packages/find-in-tree");
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const shallowMerge = require("../../packages/shallow-merge");
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const unreachable = require("../../packages/unreachable");
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module.exports = function () {
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let lsblkOnce = memoizee(() => {
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return Promise.try(() => {
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return lsblk();
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}).then((tree) => {
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return treecutter.flatten(tree);
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}).map((device) => {
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return Promise.try(() => {
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return fs.realpathAsync(device.path);
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}).then((actualPath) => {
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return shallowMerge(device, {
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path: actualPath
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});
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});
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}).then((devices) => {
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return {
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tree: treecutter.rebuild(devices),
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list: devices
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};
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});
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});
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return function (selectors) {
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return Promise.try(() => {
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return lsblkOnce();
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}).then(({tree, list}) => {
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return selectors.map((selector) => {
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if (selector === All) {
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// return tree;
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return list;
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} else {
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let { path, name } = selector;
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let predicate = asExpression(() => {
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if (path != null) {
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return (device) => device.path === path;
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} else if (name != null) {
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return (device) => device.name === name;
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} else {
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unreachable("No selector specified for lsblk");
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}
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});
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return findInTree({ tree, predicate });
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}
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});
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});
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};
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};
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