feat(doctor): add free disk space check

lib/commands/doctor/checks/free-space.js

@@ -0,0 +1,34 @@
+const sysinfo = require('systeminformation');
+const {SystemError} = require('../../../errors');
+
+const MB_IN_BYTES = 1048576;
+
+// one version of Ghost takes ~400mb of space currently, to be safe we're going to say 1gb
+const MIN_FREE_SPACE = 1024;
+
+async function checkFreeSpace(ctx) {
+    const dir = ctx.instance ? ctx.instance.dir : process.cwd();
+
+    const disks = await sysinfo.fsSize();
+
+    // filter out disks with matching mount points, then sort in descending order by mount point length
+    // to get the mount point with greatest specificity
+    const [disk] = disks.filter(d => dir.startsWith(d.mount)).sort((a, b) => b.mount.length - a.mount.length);
+
+    if (!disk) {
+        // couldn't find a matching disk, early return
+        // TODO: maybe throw a warning of some sort here?
+        return;
+    }
+
+    const available = (disk.size - disk.used) / MB_IN_BYTES;
+    if (available < MIN_FREE_SPACE) {
+        throw new SystemError(`You are recommended to have at least ${MIN_FREE_SPACE} MB of free storage space available for smooth operation. It looks like you have ~${available} MB available`);
+    }
+}
+
+module.exports = {
+    title: 'Checking free space',
+    task: checkFreeSpace,
+    category: ['install', 'update']
+};

lib/commands/doctor/checks/index.js

@@ -12,6 +12,7 @@ const filePermissions = require('./file-permissions');
 const contentFolder = require('./content-folder');
 const checkMemory = require('./check-memory');
 const binaryDeps = require('./binary-deps');
+const freeSpace = require('./free-space');
 
 module.exports = [
     nodeVersion,
@@ -26,5 +27,6 @@ module.exports = [
     filePermissions,
     contentFolder,
     checkMemory,
-    binaryDeps
+    binaryDeps,
+    freeSpace
 ];

test/unit/commands/doctor/checks/free-space-spec.js

@@ -0,0 +1,92 @@
+const {expect} = require('chai');
+const sinon = require('sinon');
+
+const sysinfo = require('systeminformation');
+const {SystemError} = require('../../../../../lib/errors');
+
+const check = require('../../../../../lib/commands/doctor/checks/free-space');
+
+describe('Unit: Doctor Checks > Free Space', function () {
+    afterEach(() => {
+        sinon.restore();
+    });
+
+    it('exports proper task', function () {
+        expect(check.title).to.equal('Checking free space');
+        expect(check.task).to.be.a('function');
+        expect(check.category).to.deep.equal(['install', 'update']);
+    });
+
+    it('handles error from systeminformation', function () {
+        const stub = sinon.stub(sysinfo, 'fsSize').rejects(new Error('test-error'));
+        const cwdStub = sinon.stub(process, 'cwd').returns('/test/directory');
+
+        return check.task({}).catch((error) => {
+            expect(error).to.be.an('error');
+            expect(error.message).to.equal('test-error');
+            expect(stub.calledOnce).to.be.true;
+            expect(cwdStub.calledOnce).to.be.true;
+        });
+    });
+
+    it('handles error from systeminformation', function () {
+        const stub = sinon.stub(sysinfo, 'fsSize').rejects(new Error('test-error'));
+        const cwdStub = sinon.stub(process, 'cwd').returns('/test/directory');
+
+        return check.task({}).catch((error) => {
+            expect(error).to.be.an('error');
+            expect(error.message).to.equal('test-error');
+            expect(stub.calledOnce).to.be.true;
+            expect(cwdStub.calledOnce).to.be.true;
+        });
+    });
+
+    it('does nothing if no matching mount points found', async function () {
+        const stub = sinon.stub(sysinfo, 'fsSize').resolves([{
+            mount: '/not/matching/dir',
+            size: 0,
+            used: 0
+        }]);
+        const cwdStub = sinon.stub(process, 'cwd').returns('/not/matching/dir');
+
+        await check.task({instance: {dir: '/test/dir'}});
+        expect(stub.calledOnce).to.be.true;
+        expect(cwdStub.called).to.be.false;
+    });
+
+    it('errors if not enough space available', function () {
+        const stub = sinon.stub(sysinfo, 'fsSize').resolves([{
+            mount: '/',
+            size: 1000000000000,
+            used: 1000000000
+        }, {
+            mount: '/test/dir',
+            size: 0,
+            used: 0
+        }]);
+        const cwdStub = sinon.stub(process, 'cwd').returns('/test/dir');
+
+        return check.task({}).catch((error) => {
+            expect(error).to.be.an.instanceOf(SystemError);
+            expect(stub.calledOnce).to.be.true;
+            expect(cwdStub.calledOnce).to.be.true;
+        });
+    });
+
+    it('succeeds if enough space available', async function () {
+        const stub = sinon.stub(sysinfo, 'fsSize').resolves([{
+            mount: '/',
+            size: 1000000000000,
+            used: 1000000000
+        }, {
+            mount: '/test/dir',
+            size: 0,
+            used: 0
+        }]);
+        const cwdStub = sinon.stub(process, 'cwd').returns('/test/dir');
+
+        await check.task({instance: {dir: '/'}});
+        expect(stub.calledOnce).to.be.true;
+        expect(cwdStub.called).to.be.false;
+    });
+});