Make writer.getImageStream() extract images from zip archives

lib/src/writer.js

@@ -17,6 +17,7 @@
 'use strict';
 
 const imageWrite = require('resin-image-write');
+const zipImage = require('resin-zip-image');
 const Bluebird = require('bluebird');
 const umount = Bluebird.promisifyAll(require('umount'));
 const fs = require('fs');
@@ -43,9 +44,17 @@ if (isWindows) {
  * const stream = writer.getImageStream('foo/bar/baz.img');
  */
 exports.getImageStream = function(image) {
+  if (zipImage.isZip(image)) {
+    if (!zipImage.isValidZipImage(image)) {
+      return Bluebird.reject(new Error('Invalid zip image'));
+    }
+
+    return zipImage.extractImage(image);
+  }
+
   let stream = fs.createReadStream(image);
   stream.length = fs.statSync(image).size;
-  return stream;
+  return Bluebird.resolve(stream);
 };
 
 /**
@@ -78,7 +87,8 @@ exports.getImageStream = function(image) {
  */
 exports.writeImage = function(image, drive, options, onProgress) {
   return umount.umountAsync(drive.device).then(function() {
-    let stream = exports.getImageStream(image);
+    return exports.getImageStream(image);
+  }).then(function(stream) {
     return imageWrite.write(drive.device, stream);
   }).then(function(writer) {
     return new Bluebird(function(resolve, reject) {

package.json

@@ -61,6 +61,7 @@
     "lodash": "^4.5.1",
     "ngstorage": "^0.3.10",
     "resin-image-write": "^2.0.5",
+    "resin-zip-image": "^1.1.0",
     "sudo-prompt": "^2.2.0",
     "trackjs": "^2.1.16",
     "umount": "^1.1.1",
@@ -78,6 +79,8 @@
     "gulp-sass": "^2.0.4",
     "jshint": "^2.9.1",
     "jshint-stylish": "^2.0.1",
-    "mochainon": "^1.0.0"
+    "mochainon": "^1.0.0",
+    "rindle": "^1.3.0",
+    "tmp": "0.0.28"
   }
 }

tests/src/writer.spec.js

@@ -2,27 +2,84 @@
 
 const m = require('mochainon');
 const ReadableStream = require('stream').Readable;
+const Bluebird = require('bluebird');
+const fs = Bluebird.promisifyAll(require('fs'));
 const path = require('path');
+const tmp = require('tmp');
+const rindle = require('rindle');
 const writer = require('../../lib/src/writer');
 
 describe('Writer:', function() {
 
   describe('.getImageStream()', function() {
 
-    describe('given a valid image', function() {
+    describe('given a valid image file', function() {
 
       beforeEach(function() {
         this.image = path.join(__dirname, '..', 'utils', 'data.random');
       });
 
-      it('should return a readable stream', function() {
-        const stream = writer.getImageStream(this.image);
-        m.chai.expect(stream).to.be.an.instanceof(ReadableStream);
+      it('should return a readable stream', function(done) {
+        writer.getImageStream(this.image).then(function(stream) {
+          m.chai.expect(stream).to.be.an.instanceof(ReadableStream);
+        }).nodeify(done);
       });
 
-      it('should append a .length property with the correct size', function() {
-        const stream = writer.getImageStream(this.image);
-        m.chai.expect(stream.length).to.equal(2097152);
+      it('should append a .length property with the correct size', function(done) {
+        writer.getImageStream(this.image).then(function(stream) {
+          m.chai.expect(stream.length).to.equal(2097152);
+        }).nodeify(done);
+      });
+
+    });
+
+    describe('given a valid image zip', function() {
+
+      beforeEach(function() {
+        this.image = path.join(__dirname, '..', 'utils', 'data.zip');
+      });
+
+      it('should return a readable stream', function(done) {
+        writer.getImageStream(this.image).then(function(stream) {
+          m.chai.expect(stream).to.be.an.instanceof(ReadableStream);
+        }).nodeify(done);
+      });
+
+      it('should append a .length property with the correct size', function(done) {
+        writer.getImageStream(this.image).then(function(stream) {
+          m.chai.expect(stream.length).to.equal(2097152);
+        }).nodeify(done);
+      });
+
+      it('should pipe the image from the zip', function(done) {
+        const tmpFile = tmp.tmpNameSync();
+        const image = path.join(__dirname, '..', 'utils', 'data.random');
+        const output = fs.createWriteStream(tmpFile);
+
+        writer.getImageStream(this.image).then(function(stream) {
+          return stream.pipe(output);
+        }).then(rindle.wait).then(function() {
+          return Bluebird.props({
+            output: fs.readFileAsync(tmpFile),
+            data: fs.readFileAsync(image)
+          });
+        }).then(function(results) {
+          m.chai.expect(results.output).to.deep.equal(results.data);
+          return fs.unlinkAsync(tmpFile);
+        }).nodeify(done);
+      });
+
+    });
+
+    describe('given an invalid image zip', function() {
+
+      beforeEach(function() {
+        this.image = path.join(__dirname, '..', 'utils', 'invalid.zip');
+      });
+
+      it('should be rejected with an error', function() {
+        const promise = writer.getImageStream(this.image);
+        m.chai.expect(promise).to.be.rejectedWith('Invalid zip image');
       });
 
     });