Esempio n. 1
0
func init() {
	Describe("concreteCompiler", func() {
		var (
			compiler       Compiler
			compressor     *fakecmd.FakeCompressor
			blobstore      *fakeblobstore.FakeBlobstore
			fs             *fakesys.FakeFileSystem
			runner         *fakesys.FakeCmdRunner
			packageApplier *fakepa.FakePackageApplier
			packagesBc     *fakebc.FakeBundleCollection
		)

		BeforeEach(func() {
			compressor = fakecmd.NewFakeCompressor()
			blobstore = &fakeblobstore.FakeBlobstore{}
			fs = fakesys.NewFakeFileSystem()
			runner = fakesys.NewFakeCmdRunner()
			packageApplier = fakepa.NewFakePackageApplier()
			packagesBc = fakebc.NewFakeBundleCollection()

			compiler = NewConcreteCompiler(
				compressor,
				blobstore,
				fs,
				runner,
				FakeCompileDirProvider{Dir: "/fake-compile-dir"},
				packageApplier,
				packagesBc,
			)
		})

		BeforeEach(func() {
			fs.MkdirAll("/fake-compile-dir", os.ModePerm)
		})

		Describe("Compile", func() {
			var (
				bundle  *fakebc.FakeBundle
				pkg     Package
				pkgDeps []boshmodels.Package
			)

			BeforeEach(func() {
				bundle = packagesBc.FakeGet(boshmodels.Package{
					Name:    "pkg_name",
					Version: "pkg_version",
				})

				bundle.InstallPath = "/fake-dir/data/packages/pkg_name/pkg_version"
				bundle.EnablePath = "/fake-dir/packages/pkg_name"

				compressor.CompressFilesInDirTarballPath = "/tmp/compressed-compiled-package"

				pkg, pkgDeps = getCompileArgs()
			})

			It("returns blob id and sha1 of created compiled package", func() {
				blobstore.CreateBlobID = "fake-blob-id"
				blobstore.CreateFingerprint = "fake-blob-sha1"

				blobID, sha1, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).ToNot(HaveOccurred())

				Expect(blobID).To(Equal("fake-blob-id"))
				Expect(sha1).To(Equal("fake-blob-sha1"))
			})

			It("cleans up all packages before applying dependent packages", func() {
				_, _, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).ToNot(HaveOccurred())
				Expect(packageApplier.ActionsCalled).To(Equal([]string{"KeepOnly", "Apply", "Apply"}))
				Expect(packageApplier.KeptOnlyPackages).To(BeEmpty())
			})

			It("returns an error if cleaning up packages fails", func() {
				packageApplier.KeepOnlyErr = errors.New("fake-keep-only-error")

				_, _, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).To(HaveOccurred())
				Expect(err.Error()).To(ContainSubstring("fake-keep-only-error"))
			})

			It("fetches source package from blobstore", func() {
				_, _, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).ToNot(HaveOccurred())

				Expect(blobstore.GetBlobIDs[0]).To(Equal("blobstore_id"))
				Expect(blobstore.GetFingerprints[0]).To(Equal("sha1"))
			})

			It("returns an error if removing compile target directory during uncompression fails", func() {
				fs.RegisterRemoveAllError("/fake-compile-dir/pkg_name", errors.New("fake-remove-error"))

				_, _, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).To(HaveOccurred())
				Expect(err.Error()).To(ContainSubstring("fake-remove-error"))
			})

			It("returns an error if creating compile target directory during uncompression fails", func() {
				fs.RegisterMkdirAllError("/fake-compile-dir/pkg_name", errors.New("fake-mkdir-error"))

				_, _, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).To(HaveOccurred())
				Expect(err.Error()).To(ContainSubstring("fake-mkdir-error"))
			})

			It("returns an error if removing temporary compile target directory during uncompression fails", func() {
				fs.RegisterRemoveAllError("/fake-compile-dir/pkg_name-bosh-agent-unpack", errors.New("fake-remove-error"))

				_, _, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).To(HaveOccurred())
				Expect(err.Error()).To(ContainSubstring("fake-remove-error"))
			})

			It("returns an error if creating temporary compile target directory during uncompression fails", func() {
				fs.RegisterMkdirAllError("/fake-compile-dir/pkg_name-bosh-agent-unpack", errors.New("fake-mkdir-error"))

				_, _, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).To(HaveOccurred())
				Expect(err.Error()).To(ContainSubstring("fake-mkdir-error"))
			})

			It("installs dependent packages", func() {
				_, _, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).ToNot(HaveOccurred())
				Expect(packageApplier.AppliedPackages).To(Equal(pkgDeps))
			})

			It("extracts source package to compile dir", func() {
				_, _, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).ToNot(HaveOccurred())

				Expect(fs.FileExists("/fake-compile-dir/pkg_name")).To(BeTrue())
				Expect(compressor.DecompressFileToDirDirs[0]).To(Equal("/fake-compile-dir/pkg_name-bosh-agent-unpack"))
				Expect(compressor.DecompressFileToDirTarballPaths[0]).To(Equal(blobstore.GetFileName))

				Expect(fs.RenameOldPaths[0]).To(Equal("/fake-compile-dir/pkg_name-bosh-agent-unpack"))
				Expect(fs.RenameNewPaths[0]).To(Equal("/fake-compile-dir/pkg_name"))
			})

			It("installs, enables and later cleans up bundle", func() {
				_, _, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).ToNot(HaveOccurred())
				Expect(bundle.ActionsCalled).To(Equal([]string{
					"InstallWithoutContents",
					"Enable",
					"Disable",
					"Uninstall",
				}))
			})

			It("runs packaging script when packaging script exists", func() {
				compressor.DecompressFileToDirCallBack = func() {
					fs.WriteFileString("/fake-compile-dir/pkg_name/packaging", "hi")
				}

				_, _, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).ToNot(HaveOccurred())

				expectedCmd := boshsys.Command{
					Name: "bash",
					Args: []string{"-x", "packaging"},
					Env: map[string]string{
						"BOSH_COMPILE_TARGET":  "/fake-compile-dir/pkg_name",
						"BOSH_INSTALL_TARGET":  "/fake-dir/packages/pkg_name",
						"BOSH_PACKAGE_NAME":    "pkg_name",
						"BOSH_PACKAGE_VERSION": "pkg_version",
					},
					WorkingDir: "/fake-compile-dir/pkg_name",
				}

				Expect(len(runner.RunComplexCommands)).To(Equal(1))
				Expect(runner.RunComplexCommands[0]).To(Equal(expectedCmd))
			})

			It("does not run packaging script when script does not exist", func() {
				_, _, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).ToNot(HaveOccurred())
				Expect(runner.RunCommands).To(BeEmpty())
			})

			It("compresses compiled package", func() {
				_, _, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).ToNot(HaveOccurred())
				Expect(compressor.CompressFilesInDirDir).To(Equal("/fake-dir/data/packages/pkg_name/pkg_version"))
			})

			It("uploads compressed package to blobstore", func() {
				compressor.CompressFilesInDirTarballPath = "/tmp/compressed-compiled-package"

				_, _, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).ToNot(HaveOccurred())
				Expect(blobstore.CreateFileName).To(Equal("/tmp/compressed-compiled-package"))
			})

			It("returs error if uploading compressed package fails", func() {
				blobstore.CreateErr = errors.New("fake-create-err")

				_, _, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).To(HaveOccurred())
				Expect(err.Error()).To(ContainSubstring("fake-create-err"))
			})

			It("cleans up compressed package after uploading it to blobstore", func() {
				var beforeCleanUpTarballPath, afterCleanUpTarballPath string

				blobstore.CreateCallBack = func() {
					beforeCleanUpTarballPath = compressor.CleanUpTarballPath
				}

				_, _, err := compiler.Compile(pkg, pkgDeps)
				Expect(err).ToNot(HaveOccurred())

				// Compressed package is not cleaned up before blobstore upload
				Expect(beforeCleanUpTarballPath).To(Equal(""))

				// Deleted after it was uploaded
				afterCleanUpTarballPath = compressor.CleanUpTarballPath
				Expect(afterCleanUpTarballPath).To(Equal("/tmp/compressed-compiled-package"))
			})
		})
	})
}
Esempio n. 2
0
func init() {
	Describe("renderedJobApplier", func() {
		var (
			jobsBc                 *fakebc.FakeBundleCollection
			jobSupervisor          *fakejobsuper.FakeJobSupervisor
			packageApplierProvider *fakepa.FakePackageApplierProvider
			blobstore              *fakeblob.FakeBlobstore
			compressor             *fakecmd.FakeCompressor
			fs                     *fakesys.FakeFileSystem
			applier                JobApplier
		)

		BeforeEach(func() {
			jobsBc = fakebc.NewFakeBundleCollection()
			jobSupervisor = fakejobsuper.NewFakeJobSupervisor()
			packageApplierProvider = fakepa.NewFakePackageApplierProvider()
			blobstore = fakeblob.NewFakeBlobstore()
			fs = fakesys.NewFakeFileSystem()
			compressor = fakecmd.NewFakeCompressor()
			logger := boshlog.NewLogger(boshlog.LevelNone)
			applier = NewRenderedJobApplier(
				jobsBc,
				jobSupervisor,
				packageApplierProvider,
				blobstore,
				compressor,
				fs,
				logger,
			)
		})

		Describe("Prepare & Apply", func() {
			var (
				job    models.Job
				bundle *fakebc.FakeBundle
			)

			BeforeEach(func() {
				job, bundle = buildJob(jobsBc)
			})

			ItInstallsJob := func(act func() error) {
				It("returns error when installing job fails", func() {
					bundle.InstallError = errors.New("fake-install-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-install-error"))
				})

				It("downloads and later cleans up downloaded job template blob", func() {
					blobstore.GetFileName = "/fake-blobstore-file-name"

					err := act()
					Expect(err).ToNot(HaveOccurred())
					Expect(blobstore.GetBlobIDs[0]).To(Equal("fake-blobstore-id"))
					Expect(blobstore.GetFingerprints[0]).To(Equal("fake-blob-sha1"))

					// downloaded file is cleaned up
					Expect(blobstore.CleanUpFileName).To(Equal("/fake-blobstore-file-name"))
				})

				It("returns error when downloading job template blob fails", func() {
					blobstore.GetError = errors.New("fake-get-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-get-error"))
				})

				It("decompresses job template blob to tmp path and later cleans it up", func() {
					fs.TempDirDir = "/fake-tmp-dir"
					blobstore.GetFileName = "/fake-blobstore-file-name"

					var tmpDirExistsBeforeInstall bool

					bundle.InstallCallBack = func() {
						tmpDirExistsBeforeInstall = true
					}

					err := act()
					Expect(err).ToNot(HaveOccurred())

					Expect(compressor.DecompressFileToDirTarballPaths[0]).To(Equal("/fake-blobstore-file-name"))
					Expect(compressor.DecompressFileToDirDirs[0]).To(Equal("/fake-tmp-dir"))

					// tmp dir exists before bundle install
					Expect(tmpDirExistsBeforeInstall).To(BeTrue())

					// tmp dir is cleaned up after install
					Expect(fs.FileExists(fs.TempDirDir)).To(BeFalse())
				})

				It("returns error when temporary directory creation fails", func() {
					fs.TempDirError = errors.New("fake-filesystem-tempdir-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-filesystem-tempdir-error"))
				})

				It("returns error when decompressing job template fails", func() {
					compressor.DecompressFileToDirErr = errors.New("fake-decompress-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-decompress-error"))
				})

				It("returns error when getting the list of bin files fails", func() {
					fs.GlobErr = errors.New("fake-glob-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-glob-error"))
				})

				It("returns error when changing permissions on bin files fails", func() {
					fs.TempDirDir = "/fake-tmp-dir"

					fs.SetGlob("/fake-tmp-dir/fake-path-in-archive/bin/*", []string{
						"/fake-tmp-dir/fake-path-in-archive/bin/test",
					})

					fs.ChmodErr = errors.New("fake-chmod-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-chmod-error"))
				})

				It("installs bundle from decompressed tmp path of a job template", func() {
					fs.TempDirDir = "/fake-tmp-dir"

					var installedBeforeDecompression bool

					compressor.DecompressFileToDirCallBack = func() {
						installedBeforeDecompression = bundle.Installed
					}

					err := act()
					Expect(err).ToNot(HaveOccurred())

					// bundle installation did not happen before decompression
					Expect(installedBeforeDecompression).To(BeFalse())

					// make sure that bundle install happened after decompression
					Expect(bundle.InstallSourcePath).To(Equal("/fake-tmp-dir/fake-path-in-archive"))
				})

				It("sets executable bit for files in bin", func() {
					fs.TempDirDir = "/fake-tmp-dir"

					compressor.DecompressFileToDirCallBack = func() {
						fs.WriteFile("/fake-tmp-dir/fake-path-in-archive/bin/test1", []byte{})
						fs.WriteFile("/fake-tmp-dir/fake-path-in-archive/bin/test2", []byte{})
						fs.WriteFile("/fake-tmp-dir/fake-path-in-archive/config/test", []byte{})
					}

					fs.SetGlob("/fake-tmp-dir/fake-path-in-archive/bin/*", []string{
						"/fake-tmp-dir/fake-path-in-archive/bin/test1",
						"/fake-tmp-dir/fake-path-in-archive/bin/test2",
					})

					var binTest1Stats, binTest2Stats, configTestStats *fakesys.FakeFileStats

					bundle.InstallCallBack = func() {
						binTest1Stats = fs.GetFileTestStat("/fake-tmp-dir/fake-path-in-archive/bin/test1")
						binTest2Stats = fs.GetFileTestStat("/fake-tmp-dir/fake-path-in-archive/bin/test2")
						configTestStats = fs.GetFileTestStat("/fake-tmp-dir/fake-path-in-archive/config/test")
					}

					err := act()
					Expect(err).ToNot(HaveOccurred())

					// bin files are executable
					Expect(int(binTest1Stats.FileMode)).To(Equal(0755))
					Expect(int(binTest2Stats.FileMode)).To(Equal(0755))

					// non-bin files are not made executable
					Expect(int(configTestStats.FileMode)).ToNot(Equal(0755))
				})
			}

			ItUpdatesPackages := func(act func() error) {
				var packageApplier *fakepa.FakePackageApplier

				BeforeEach(func() {
					packageApplier = fakepa.NewFakePackageApplier()
					packageApplierProvider.JobSpecificPackageAppliers[job.Name] = packageApplier
				})

				It("applies each package that job depends on and then cleans up packages", func() {
					err := act()
					Expect(err).ToNot(HaveOccurred())
					Expect(packageApplier.ActionsCalled).To(Equal([]string{"Apply", "Apply", "KeepOnly"}))
					Expect(len(packageApplier.AppliedPackages)).To(Equal(2)) // present
					Expect(packageApplier.AppliedPackages).To(Equal(job.Packages))
				})

				It("returns error when applying package that job depends on fails", func() {
					packageApplier.ApplyError = errors.New("fake-apply-err")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-apply-err"))
				})

				It("keeps only currently required packages but does not completely uninstall them", func() {
					err := act()
					Expect(err).ToNot(HaveOccurred())
					Expect(len(packageApplier.KeptOnlyPackages)).To(Equal(2)) // present
					Expect(packageApplier.KeptOnlyPackages).To(Equal(job.Packages))
				})

				It("returns error when keeping only currently required packages fails", func() {
					packageApplier.KeepOnlyErr = errors.New("fake-keep-only-err")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-keep-only-err"))
				})
			}

			Describe("Prepare", func() {
				act := func() error { return applier.Prepare(job) }

				It("return an error if getting file bundle fails", func() {
					jobsBc.GetErr = errors.New("fake-get-bundle-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-get-bundle-error"))
				})

				It("returns an error if checking for installed path fails", func() {
					bundle.IsInstalledErr = errors.New("fake-is-installed-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-is-installed-error"))
				})

				Context("when job is already installed", func() {
					BeforeEach(func() {
						bundle.Installed = true
					})

					It("does not install", func() {
						err := act()
						Expect(err).ToNot(HaveOccurred())
						Expect(bundle.ActionsCalled).To(Equal([]string{})) // no Install
					})

					It("does not download the job template", func() {
						err := act()
						Expect(err).ToNot(HaveOccurred())
						Expect(blobstore.GetBlobIDs).To(BeNil())
					})
				})

				Context("when job is not installed", func() {
					BeforeEach(func() {
						bundle.Installed = false
					})

					It("installs job (but does not enable)", func() {
						err := act()
						Expect(err).ToNot(HaveOccurred())
						Expect(bundle.ActionsCalled).To(Equal([]string{"Install"}))
					})

					ItInstallsJob(act)
				})
			})

			Describe("Apply", func() {
				act := func() error { return applier.Apply(job) }

				It("return an error if getting file bundle fails", func() {
					jobsBc.GetErr = errors.New("fake-get-bundle-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-get-bundle-error"))
				})

				It("returns an error if checking for installed path fails", func() {
					bundle.IsInstalledErr = errors.New("fake-is-installed-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-is-installed-error"))
				})

				Context("when job is already installed", func() {
					BeforeEach(func() {
						bundle.Installed = true
					})

					It("does not install but only enables job", func() {
						err := act()
						Expect(err).ToNot(HaveOccurred())
						Expect(bundle.ActionsCalled).To(Equal([]string{"Enable"})) // no Install
					})

					It("returns error when job enable fails", func() {
						bundle.EnableError = errors.New("fake-enable-error")

						err := act()
						Expect(err).To(HaveOccurred())
						Expect(err.Error()).To(ContainSubstring("fake-enable-error"))
					})

					It("does not download the job template", func() {
						err := act()
						Expect(err).ToNot(HaveOccurred())
						Expect(blobstore.GetBlobIDs).To(BeNil())
					})

					ItUpdatesPackages(act)
				})

				Context("when job is not installed", func() {
					BeforeEach(func() {
						bundle.Installed = false
					})

					It("installs and enables job", func() {
						err := act()
						Expect(err).ToNot(HaveOccurred())
						Expect(bundle.ActionsCalled).To(Equal([]string{"Install", "Enable"}))
					})

					It("returns error when job enable fails", func() {
						bundle.EnableError = errors.New("fake-enable-error")

						err := act()
						Expect(err).To(HaveOccurred())
						Expect(err.Error()).To(ContainSubstring("fake-enable-error"))
					})

					ItInstallsJob(act)

					ItUpdatesPackages(act)
				})
			})
		})

		Describe("Configure", func() {
			It("adds job to the job supervisor", func() {
				job, bundle := buildJob(jobsBc)

				fs := fakesys.NewFakeFileSystem()
				fs.WriteFileString("/path/to/job/monit", "some conf")
				fs.SetGlob("/path/to/job/*.monit", []string{"/path/to/job/subjob.monit"})

				bundle.GetDirPath = "/path/to/job"
				bundle.GetDirFs = fs

				err := applier.Configure(job, 0)
				Expect(err).ToNot(HaveOccurred())

				Expect(2).To(Equal(len(jobSupervisor.AddJobArgs)))

				firstArgs := fakejobsuper.AddJobArgs{
					Name:       job.Name,
					Index:      0,
					ConfigPath: "/path/to/job/monit",
				}

				secondArgs := fakejobsuper.AddJobArgs{
					Name:       job.Name + "_subjob",
					Index:      0,
					ConfigPath: "/path/to/job/subjob.monit",
				}
				Expect(firstArgs).To(Equal(jobSupervisor.AddJobArgs[0]))
				Expect(secondArgs).To(Equal(jobSupervisor.AddJobArgs[1]))
			})
		})

		Describe("KeepOnly", func() {
			It("first disables and then uninstalls jobs that are not in keeponly list", func() {
				_, bundle1 := buildJob(jobsBc)
				job2, bundle2 := buildJob(jobsBc)
				_, bundle3 := buildJob(jobsBc)
				job4, bundle4 := buildJob(jobsBc)

				jobsBc.ListBundles = []boshbc.Bundle{bundle1, bundle2, bundle3, bundle4}

				err := applier.KeepOnly([]models.Job{job4, job2})
				Expect(err).ToNot(HaveOccurred())

				Expect(bundle1.ActionsCalled).To(Equal([]string{"Disable", "Uninstall"}))
				Expect(bundle2.ActionsCalled).To(Equal([]string{}))
				Expect(bundle3.ActionsCalled).To(Equal([]string{"Disable", "Uninstall"}))
				Expect(bundle4.ActionsCalled).To(Equal([]string{}))
			})

			It("returns error when bundle collection fails to return list of installed bundles", func() {
				jobsBc.ListErr = errors.New("fake-bc-list-error")

				err := applier.KeepOnly([]models.Job{})
				Expect(err).To(HaveOccurred())
				Expect(err.Error()).To(ContainSubstring("fake-bc-list-error"))
			})

			It("returns error when bundle collection cannot retrieve bundle for keep-only job", func() {
				job1, bundle1 := buildJob(jobsBc)

				jobsBc.ListBundles = []boshbc.Bundle{bundle1}
				jobsBc.GetErr = errors.New("fake-bc-get-error")

				err := applier.KeepOnly([]models.Job{job1})
				Expect(err).To(HaveOccurred())
				Expect(err.Error()).To(ContainSubstring("fake-bc-get-error"))
			})

			It("returns error when at least one bundle cannot be disabled", func() {
				_, bundle1 := buildJob(jobsBc)

				jobsBc.ListBundles = []boshbc.Bundle{bundle1}
				bundle1.DisableErr = errors.New("fake-bc-disable-error")

				err := applier.KeepOnly([]models.Job{})
				Expect(err).To(HaveOccurred())
				Expect(err.Error()).To(ContainSubstring("fake-bc-disable-error"))
			})

			It("returns error when at least one bundle cannot be uninstalled", func() {
				_, bundle1 := buildJob(jobsBc)

				jobsBc.ListBundles = []boshbc.Bundle{bundle1}
				bundle1.UninstallErr = errors.New("fake-bc-uninstall-error")

				err := applier.KeepOnly([]models.Job{})
				Expect(err).To(HaveOccurred())
				Expect(err.Error()).To(ContainSubstring("fake-bc-uninstall-error"))
			})
		})
	})
}
func init() {
	Describe("concretePackageApplier", func() {
		var (
			packagesBc *fakebc.FakeBundleCollection
			blobstore  *fakeblob.FakeBlobstore
			compressor *fakecmd.FakeCompressor
			fs         *fakesys.FakeFileSystem
			logger     boshlog.Logger
			applier    PackageApplier
		)

		BeforeEach(func() {
			packagesBc = fakebc.NewFakeBundleCollection()
			blobstore = fakeblob.NewFakeBlobstore()
			compressor = fakecmd.NewFakeCompressor()
			fs = fakesys.NewFakeFileSystem()
			logger = boshlog.NewLogger(boshlog.LevelNone)
			applier = NewConcretePackageApplier(packagesBc, true, blobstore, compressor, fs, logger)
		})

		Describe("Prepare & Apply", func() {
			var (
				pkg    models.Package
				bundle *fakebc.FakeBundle
			)

			BeforeEach(func() {
				pkg, bundle = buildPkg(packagesBc)
			})

			ItInstallsPkg := func(act func() error) {
				It("returns error when installing package fails", func() {
					bundle.InstallError = errors.New("fake-install-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-install-error"))
				})

				It("downloads and later cleans up downloaded package blob", func() {
					blobstore.GetFileName = "/fake-blobstore-file-name"

					err := act()
					Expect(err).ToNot(HaveOccurred())
					Expect(blobstore.GetBlobIDs[0]).To(Equal("fake-blobstore-id"))
					Expect(blobstore.GetFingerprints[0]).To(Equal("fake-blob-sha1"))

					// downloaded file is cleaned up
					Expect(blobstore.CleanUpFileName).To(Equal("/fake-blobstore-file-name"))
				})

				It("returns error when downloading package blob fails", func() {
					blobstore.GetError = errors.New("fake-get-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-get-error"))
				})

				It("decompresses package blob to tmp path and later cleans it up", func() {
					fs.TempDirDir = "/fake-tmp-dir"
					blobstore.GetFileName = "/fake-blobstore-file-name"

					var tmpDirExistsBeforeInstall bool

					bundle.InstallCallBack = func() {
						tmpDirExistsBeforeInstall = true
					}

					err := act()
					Expect(err).ToNot(HaveOccurred())

					Expect(compressor.DecompressFileToDirTarballPaths[0]).To(Equal("/fake-blobstore-file-name"))
					Expect(compressor.DecompressFileToDirDirs[0]).To(Equal("/fake-tmp-dir"))

					// tmp dir exists before bundle install
					Expect(tmpDirExistsBeforeInstall).To(BeTrue())

					// tmp dir is cleaned up after install
					Expect(fs.FileExists(fs.TempDirDir)).To(BeFalse())
				})

				It("returns error when temporary directory creation fails", func() {
					fs.TempDirError = errors.New("fake-filesystem-tempdir-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-filesystem-tempdir-error"))
				})

				It("returns error when decompressing package blob fails", func() {
					compressor.DecompressFileToDirErr = errors.New("fake-decompress-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-decompress-error"))
				})

				It("installs bundle from decompressed tmp path of a package blob", func() {
					fs.TempDirDir = "/fake-tmp-dir"

					var installedBeforeDecompression bool

					compressor.DecompressFileToDirCallBack = func() {
						installedBeforeDecompression = bundle.Installed
					}

					err := act()
					Expect(err).ToNot(HaveOccurred())

					// bundle installation did not happen before decompression
					Expect(installedBeforeDecompression).To(BeFalse())

					// make sure that bundle install happened after decompression
					Expect(bundle.InstallSourcePath).To(Equal("/fake-tmp-dir"))
				})
			}

			Describe("Prepare", func() {
				act := func() error { return applier.Prepare(pkg) }

				It("return an error if getting file bundle fails", func() {
					packagesBc.GetErr = errors.New("fake-get-bundle-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-get-bundle-error"))
				})

				It("returns an error if checking for package installation fails", func() {
					bundle.IsInstalledErr = errors.New("fake-is-installed-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-is-installed-error"))
				})

				Context("when package is already installed", func() {
					BeforeEach(func() {
						bundle.Installed = true
					})

					It("does not install", func() {
						err := act()
						Expect(err).ToNot(HaveOccurred())
						Expect(bundle.ActionsCalled).To(Equal([]string{})) // no Install
					})

					It("does not download the package", func() {
						err := act()
						Expect(err).ToNot(HaveOccurred())
						Expect(blobstore.GetBlobIDs).To(BeNil())
					})
				})

				Context("when package is not installed", func() {
					BeforeEach(func() {
						bundle.Installed = false
					})

					It("installs package (but does not enable it)", func() {
						err := act()
						Expect(err).ToNot(HaveOccurred())
						Expect(bundle.ActionsCalled).To(Equal([]string{"Install"}))
					})

					ItInstallsPkg(act)
				})
			})

			Describe("Apply", func() {
				act := func() error { return applier.Apply(pkg) }

				It("return an error if getting file bundle fails", func() {
					packagesBc.GetErr = errors.New("fake-get-bundle-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-get-bundle-error"))
				})

				It("returns an error if checking for package installation fails", func() {
					bundle.IsInstalledErr = errors.New("fake-is-installed-error")

					err := act()
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-is-installed-error"))
				})

				Context("when package is already installed", func() {
					BeforeEach(func() {
						bundle.Installed = true
					})

					It("does not install but only enables package", func() {
						err := act()
						Expect(err).ToNot(HaveOccurred())
						Expect(bundle.ActionsCalled).To(Equal([]string{"Enable"})) // no Install
					})

					It("returns error when package enable fails", func() {
						bundle.EnableError = errors.New("fake-enable-error")

						err := act()
						Expect(err).To(HaveOccurred())
						Expect(err.Error()).To(ContainSubstring("fake-enable-error"))
					})

					It("does not download the package", func() {
						err := act()
						Expect(err).ToNot(HaveOccurred())
						Expect(blobstore.GetBlobIDs).To(BeNil())
					})
				})

				Context("when package is not installed", func() {
					BeforeEach(func() {
						bundle.Installed = false
					})

					It("installs and enables package", func() {
						err := act()
						Expect(err).ToNot(HaveOccurred())
						Expect(bundle.ActionsCalled).To(Equal([]string{"Install", "Enable"}))
					})

					It("returns error when package enable fails", func() {
						bundle.EnableError = errors.New("fake-enable-error")

						err := act()
						Expect(err).To(HaveOccurred())
						Expect(err.Error()).To(ContainSubstring("fake-enable-error"))
					})

					ItInstallsPkg(act)
				})
			})
		})

		Describe("KeepOnly", func() {
			ItReturnsErrors := func() {
				It("returns error when bundle collection fails to return list of installed bundles", func() {
					packagesBc.ListErr = errors.New("fake-bc-list-error")

					err := applier.KeepOnly([]models.Package{})
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-bc-list-error"))
				})

				It("returns error when bundle collection cannot retrieve bundle for keep-only package", func() {
					pkg1, bundle1 := buildPkg(packagesBc)

					packagesBc.ListBundles = []boshbc.Bundle{bundle1}
					packagesBc.GetErr = errors.New("fake-bc-get-error")

					err := applier.KeepOnly([]models.Package{pkg1})
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-bc-get-error"))
				})

				It("returns error when at least one bundle cannot be disabled", func() {
					_, bundle1 := buildPkg(packagesBc)

					packagesBc.ListBundles = []boshbc.Bundle{bundle1}
					bundle1.DisableErr = errors.New("fake-bc-disable-error")

					err := applier.KeepOnly([]models.Package{})
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-bc-disable-error"))
				})
			}

			Context("when operating on packages as a package owner", func() {
				BeforeEach(func() {
					applier = NewConcretePackageApplier(packagesBc, true, blobstore, compressor, fs, logger)
				})

				It("first disables and then uninstalls packages that are not in keeponly list", func() {
					_, bundle1 := buildPkg(packagesBc)
					pkg2, bundle2 := buildPkg(packagesBc)
					_, bundle3 := buildPkg(packagesBc)
					pkg4, bundle4 := buildPkg(packagesBc)

					packagesBc.ListBundles = []boshbc.Bundle{bundle1, bundle2, bundle3, bundle4}

					err := applier.KeepOnly([]models.Package{pkg4, pkg2})
					Expect(err).ToNot(HaveOccurred())

					Expect(bundle1.ActionsCalled).To(Equal([]string{"Disable", "Uninstall"}))
					Expect(bundle2.ActionsCalled).To(Equal([]string{}))
					Expect(bundle3.ActionsCalled).To(Equal([]string{"Disable", "Uninstall"}))
					Expect(bundle4.ActionsCalled).To(Equal([]string{}))
				})

				ItReturnsErrors()

				It("returns error when at least one bundle cannot be uninstalled", func() {
					_, bundle1 := buildPkg(packagesBc)

					packagesBc.ListBundles = []boshbc.Bundle{bundle1}
					bundle1.UninstallErr = errors.New("fake-bc-uninstall-error")

					err := applier.KeepOnly([]models.Package{})
					Expect(err).To(HaveOccurred())
					Expect(err.Error()).To(ContainSubstring("fake-bc-uninstall-error"))
				})
			})

			Context("when operating on packages not as a package owner", func() {
				BeforeEach(func() {
					applier = NewConcretePackageApplier(packagesBc, false, blobstore, compressor, fs, logger)
				})

				It("disables and but does not uninstall packages that are not in keeponly list", func() {
					_, bundle1 := buildPkg(packagesBc)
					pkg2, bundle2 := buildPkg(packagesBc)
					_, bundle3 := buildPkg(packagesBc)
					pkg4, bundle4 := buildPkg(packagesBc)

					packagesBc.ListBundles = []boshbc.Bundle{bundle1, bundle2, bundle3, bundle4}

					err := applier.KeepOnly([]models.Package{pkg4, pkg2})
					Expect(err).ToNot(HaveOccurred())

					Expect(bundle1.ActionsCalled).To(Equal([]string{"Disable"})) // no Uninstall
					Expect(bundle2.ActionsCalled).To(Equal([]string{}))
					Expect(bundle3.ActionsCalled).To(Equal([]string{"Disable"})) // no Uninstall
					Expect(bundle4.ActionsCalled).To(Equal([]string{}))
				})

				ItReturnsErrors()
			})

		})
	})
}