func FindProject(revision string, projectRef *ProjectRef) (*Project, error) {
	if projectRef == nil {
		return nil, fmt.Errorf("projectRef given is nil")
	}
	if projectRef.Identifier == "" {
		return nil, fmt.Errorf("Invalid project with blank identifier")
	}

	project := &Project{}
	project.Identifier = projectRef.Identifier
	// when the revision is empty we find the last known good configuration from the versions
	// If the last known good configuration does not exist,
	// load the configuration from the local config in the project ref.
	if revision == "" {
		lastGoodVersion, err := version.FindOne(version.ByLastKnownGoodConfig(projectRef.Identifier))
		if err != nil {
			return nil, fmt.Errorf("Error finding recent valid version for %v: %v", projectRef.Identifier, err)
		}
		if lastGoodVersion != nil {
			// for new repositories, we don't want to error out when we don't have
			// any versions stored in the database so we default to the skeletal
			// information we already have from the project file on disk
			err = LoadProjectInto([]byte(lastGoodVersion.Config), projectRef.Identifier, project)
			if err != nil {
				return nil, fmt.Errorf("Error loading project from "+
					"last good version for project, %v: %v", lastGoodVersion.Identifier, err)
			}
		} else {
			// Check to see if there is a local configuration in the project ref
			if projectRef.LocalConfig != "" {
				err = LoadProjectInto([]byte(projectRef.LocalConfig), projectRef.Identifier, project)
				if err != nil {
					return nil, fmt.Errorf("Error loading local config for project ref, %v : %v", projectRef.Identifier, err)
				}
			}
		}
	}

	if revision != "" {
		// we immediately return an error if the repotracker version isn't found
		// for the given project at the given revision
		version, err := version.FindOne(version.ByProjectIdAndRevision(projectRef.Identifier, revision))
		if err != nil {
			return nil, fmt.Errorf("error fetching version for project %v revision %v: %v", projectRef.Identifier, revision, err)
		}
		if version == nil {
			// fall back to the skeletal project
			return project, nil
		}

		project = &Project{}
		if err = LoadProjectInto([]byte(version.Config), projectRef.Identifier, project); err != nil {
			return nil, fmt.Errorf("Error loading project from version: %v", err)
		}
	}
	return project, nil
}

func TestLastKnownGoodConfig(t *testing.T) {
	Convey("When calling LastKnownGoodConfig..", t, func() {
		identifier := "identifier"
		Convey("no versions should be returned if there're no good "+
			"last known configurations", func() {
			v := &version.Version{
				Identifier: identifier,
				Requester:  evergreen.RepotrackerVersionRequester,
				Errors:     []string{"error 1", "error 2"},
			}
			testutil.HandleTestingErr(v.Insert(), t, "Error inserting test version: %v")
			lastGood, err := version.FindOne(version.ByLastKnownGoodConfig(identifier))
			testutil.HandleTestingErr(err, t, "error finding last known good: %v")
			So(lastGood, ShouldBeNil)
		})
		Convey("a version should be returned if there is a last known good configuration", func() {
			v := &version.Version{
				Identifier: identifier,
				Requester:  evergreen.RepotrackerVersionRequester,
			}
			testutil.HandleTestingErr(v.Insert(), t, "Error inserting test version: %v")
			lastGood, err := version.FindOne(version.ByLastKnownGoodConfig(identifier))
			testutil.HandleTestingErr(err, t, "error finding last known good: %v")
			So(lastGood, ShouldNotBeNil)
		})
		Convey("most recent version should be found if there are several recent good configs", func() {
			v := &version.Version{
				Id:                  "1",
				Identifier:          identifier,
				Requester:           evergreen.RepotrackerVersionRequester,
				RevisionOrderNumber: 1,
				Config:              "1",
			}
			testutil.HandleTestingErr(v.Insert(), t, "Error inserting test version: %v")
			v.Id = "5"
			v.RevisionOrderNumber = 5
			v.Config = "5"
			testutil.HandleTestingErr(v.Insert(), t, "Error inserting test version: %v")
			v.Id = "2"
			v.RevisionOrderNumber = 2
			v.Config = "2"
			testutil.HandleTestingErr(v.Insert(), t, "Error inserting test version: %v")
			lastGood, err := version.FindOne(version.ByLastKnownGoodConfig(identifier))
			testutil.HandleTestingErr(err, t, "error finding last known good: %v")
			So(lastGood, ShouldNotBeNil)
			So(lastGood.Config, ShouldEqual, "5")
		})
		Reset(func() {
			db.Clear(version.Collection)
		})
	})
}

// getTasksForLatestVersion sends back the TaskJSON data associated with the latest version.
func getTasksForLatestVersion(w http.ResponseWriter, r *http.Request) {

	name := mux.Vars(r)["name"]
	var jsonTask TaskJSON

	projects := []string{}
	err := util.ReadJSONInto(r.Body, &projects)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	versionData := []VersionData{}
	for _, project := range projects {
		err := db.FindOneQ(collection, db.Query(bson.M{NameKey: name,
			ProjectIdKey: project}).Sort([]string{"-" + RevisionOrderNumberKey}).WithFields(VersionIdKey), &jsonTask)
		if err != nil {
			if err != mgo.ErrNotFound {
				http.Error(w, err.Error(), http.StatusInternalServerError)
				return
			}
			http.Error(w, "{}", http.StatusNotFound)
			return
		}
		if jsonTask.VersionId == "" {
			http.Error(w, "{}", http.StatusNotFound)
		}
		jsonTasks, err := findTasksForVersion(jsonTask.VersionId, name)
		if jsonTasks == nil {
			http.Error(w, "{}", http.StatusNotFound)
			return
		}
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		// get the version commit info
		v, err := version.FindOne(version.ById(jsonTask.VersionId))
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		if v == nil {
			http.Error(w, "{}", http.StatusNotFound)
			return
		}

		commitInfo := CommitInfo{
			Author:     v.Author,
			Message:    v.Message,
			CreateTime: v.CreateTime,
			Revision:   v.Revision,
			VersionId:  jsonTask.VersionId,
		}

		versionData = append(versionData, VersionData{jsonTasks, commitInfo})
	}
	plugin.WriteJSON(w, http.StatusOK, versionData)
}

// populatePatch loads a patch into the project context, using patchId if provided.
// If patchId is blank, will try to infer the patch ID from the version already loaded
// into context, if available.
func (pc *projectContext) populatePatch(patchId string) error {
	var err error
	if len(patchId) > 0 {
		// The patch is explicitly identified in the URL, so fetch it
		if !patch.IsValidId(patchId) {
			return fmt.Errorf("patch id '%v' is not an object id", patchId)
		}
		pc.Patch, err = patch.FindOne(patch.ById(patch.NewId(patchId)).Project(patch.ExcludePatchDiff))
	} else if pc.Version != nil {
		// patch isn't in URL but the version in context has one, get it
		pc.Patch, err = patch.FindOne(patch.ByVersion(pc.Version.Id).Project(patch.ExcludePatchDiff))
	}
	if err != nil {
		return err
	}

	// If there's a finalized patch loaded into context but not a version, load the version
	// associated with the patch as the context's version.
	if pc.Version == nil && pc.Patch != nil && pc.Patch.Version != "" {
		pc.Version, err = version.FindOne(version.ById(pc.Patch.Version))
		if err != nil {
			return err
		}
	}
	return nil
}

// Returns a JSON response with the marshalled output of the version
// specified in the request.
func (restapi restAPI) getVersionInfo(w http.ResponseWriter, r *http.Request) {
	versionId := mux.Vars(r)["version_id"]

	srcVersion, err := version.FindOne(version.ById(versionId))
	if err != nil || srcVersion == nil {
		msg := fmt.Sprintf("Error finding version '%v'", versionId)
		statusCode := http.StatusNotFound

		if err != nil {
			evergreen.Logger.Logf(slogger.ERROR, "%v: %v", msg, err)
			statusCode = http.StatusInternalServerError
		}

		restapi.WriteJSON(w, statusCode, responseError{Message: msg})
		return
	}

	destVersion := &restVersion{}
	// Copy the contents from the database into our local version type
	err = angier.TransferByFieldNames(srcVersion, destVersion)
	if err != nil {
		msg := fmt.Sprintf("Error finding version '%v'", versionId)
		evergreen.Logger.Logf(slogger.ERROR, "%v: %v", msg, err)
		restapi.WriteJSON(w, http.StatusInternalServerError, responseError{Message: msg})
		return
	}
	for _, buildStatus := range srcVersion.BuildVariants {
		destVersion.BuildVariants = append(destVersion.BuildVariants, buildStatus.BuildVariant)
		evergreen.Logger.Logf(slogger.ERROR, "adding BuildVariant %v", buildStatus.BuildVariant)
	}

	restapi.WriteJSON(w, http.StatusOK, destVersion)
	return

}

// TryMarkPatchBuildFinished attempts to mark a patch as finished if all
// the builds for the patch are finished as well
func TryMarkPatchBuildFinished(b *build.Build, finishTime time.Time) error {
	v, err := version.FindOne(version.ById(b.Version))
	if err != nil {
		return err
	}
	if v == nil {
		return fmt.Errorf("Cannot find version for build %v with version %v", b.Id, b.Version)
	}

	// ensure all builds for this patch are finished as well
	builds, err := build.Find(build.ByIds(v.BuildIds).WithFields(build.StatusKey))
	if err != nil {
		return err
	}

	patchCompleted := true
	status := evergreen.PatchSucceeded
	for _, build := range builds {
		if !build.IsFinished() {
			patchCompleted = false
		}
		if build.Status != evergreen.BuildSucceeded {
			status = evergreen.PatchFailed
		}
	}

	// nothing to do if the patch isn't completed
	if !patchCompleted {
		return nil
	}

	return patch.TryMarkFinished(v.Id, finishTime, status)
}

func (m *ManifestPlugin) GetManifest(w http.ResponseWriter, r *http.Request) {
	project := mux.Vars(r)["project_id"]
	revision := mux.Vars(r)["revision"]

	version, err := version.FindOne(version.ByProjectIdAndRevision(project, revision))
	if err != nil {
		http.Error(w, fmt.Sprintf("error getting version for project %v with revision %v: %v",
			project, revision, err), http.StatusBadRequest)
		return
	}
	if version == nil {
		http.Error(w, fmt.Sprintf("version not found for project %v, with revision %v", project, revision),
			http.StatusNotFound)
		return
	}

	foundManifest, err := manifest.FindOne(manifest.ById(version.Id))
	if err != nil {
		http.Error(w, fmt.Sprintf("error getting manifest with version id %v: %v",
			version.Id, err), http.StatusBadRequest)
		return
	}
	if foundManifest == nil {
		http.Error(w, fmt.Sprintf("manifest not found for version %v", version.Id), http.StatusNotFound)
		return
	}
	plugin.WriteJSON(w, http.StatusOK, foundManifest)
	return

}

// Returns a JSON response with the marshalled output of the version
// specified by its revision and project name in the request.
func (restapi restAPI) getVersionInfoViaRevision(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	projectId := vars["project_id"]
	revision := vars["revision"]

	srcVersion, err := version.FindOne(version.ByProjectIdAndRevision(projectId, revision))
	if err != nil || srcVersion == nil {
		msg := fmt.Sprintf("Error finding revision '%v' for project '%v'", revision, projectId)
		statusCode := http.StatusNotFound

		if err != nil {
			evergreen.Logger.Logf(slogger.ERROR, "%v: %v", msg, err)
			statusCode = http.StatusInternalServerError
		}

		restapi.WriteJSON(w, statusCode, responseError{Message: msg})
		return
	}

	destVersion := &restVersion{}
	copyVersion(srcVersion, destVersion)

	for _, buildStatus := range srcVersion.BuildVariants {
		destVersion.BuildVariants = append(destVersion.BuildVariants, buildStatus.BuildVariant)
		evergreen.Logger.Logf(slogger.ERROR, "adding BuildVariant %v", buildStatus.BuildVariant)
	}

	restapi.WriteJSON(w, http.StatusOK, destVersion)
	return

}

// createVersionItems populates and stores all the tasks and builds for a version according to
// the given project config.
func createVersionItems(v *version.Version, ref *model.ProjectRef, project *model.Project) error {
	for _, buildvariant := range project.BuildVariants {
		if buildvariant.Disabled {
			continue
		}
		buildId, err := model.CreateBuildFromVersion(project, v, buildvariant.Name, false, nil)
		if err != nil {
			return err
		}

		lastActivated, err := version.FindOne(version.ByLastVariantActivation(ref.Identifier, buildvariant.Name))
		if err != nil {
			evergreen.Logger.Logf(slogger.ERROR, "Error getting activation time for bv %v", buildvariant.Name)
			return err
		}

		var lastActivation *time.Time
		if lastActivated != nil {
			for _, buildStatus := range lastActivated.BuildVariants {
				if buildStatus.BuildVariant == buildvariant.Name && buildStatus.Activated {
					lastActivation = &buildStatus.ActivateAt
					break
				}
			}
		}

		var activateAt time.Time
		var activated bool
		if lastActivation == nil {
			// if we don't have a last activation time then activate now.
			activateAt = time.Now()
			activated = true
		} else {
			activateAt = lastActivation.Add(time.Minute * time.Duration(ref.GetBatchTime(&buildvariant)))
			evergreen.Logger.Logf(slogger.INFO, "Going to activate bv %v for project %v, version %v at %v",
				buildvariant.Name, ref.Identifier, v.Id, activateAt)
		}

		v.BuildIds = append(v.BuildIds, buildId)
		v.BuildVariants = append(v.BuildVariants, version.BuildStatus{
			BuildVariant: buildvariant.Name,
			Activated:    activated,
			ActivateAt:   activateAt,
			BuildId:      buildId,
		})
	}

	if err := v.Insert(); err != nil {
		evergreen.Logger.Errorf(slogger.ERROR, "Error inserting version %v: %v", v.Id, err)
		for _, buildStatus := range v.BuildVariants {
			if buildErr := model.DeleteBuild(buildStatus.BuildId); buildErr != nil {
				evergreen.Logger.Errorf(slogger.ERROR, "Error deleting build %v: %v",
					buildStatus.BuildId, buildErr)
			}
		}
		return err
	}
	return nil
}

func TestUpdateBuildStatusForTask(t *testing.T) {
	Convey("With two tasks and a build", t, func() {
		testutil.HandleTestingErr(db.ClearCollections(task.Collection, build.Collection, version.Collection), t,
			"Error clearing task and build collections")
		displayName := "testName"
		b := &build.Build{
			Id:      "buildtest",
			Status:  evergreen.BuildStarted,
			Version: "abc",
		}
		v := &version.Version{
			Id:     b.Version,
			Status: evergreen.VersionStarted,
		}
		testTask := task.Task{
			Id:          "testone",
			DisplayName: displayName,
			Activated:   false,
			BuildId:     b.Id,
			Project:     "sample",
			Status:      evergreen.TaskFailed,
		}
		anotherTask := task.Task{
			Id:          "two",
			DisplayName: displayName,
			Activated:   true,
			BuildId:     b.Id,
			Project:     "sample",
			Status:      evergreen.TaskFailed,
		}

		b.Tasks = []build.TaskCache{
			{
				Id:     testTask.Id,
				Status: evergreen.TaskSucceeded,
			},
			{
				Id:     anotherTask.Id,
				Status: evergreen.TaskFailed,
			},
		}
		So(b.Insert(), ShouldBeNil)
		So(testTask.Insert(), ShouldBeNil)
		So(anotherTask.Insert(), ShouldBeNil)
		So(v.Insert(), ShouldBeNil)
		Convey("updating the build for a task should update the build's status and the version's status", func() {
			So(UpdateBuildAndVersionStatusForTask(testTask.Id), ShouldBeNil)
			b, err := build.FindOne(build.ById(b.Id))
			So(err, ShouldBeNil)
			So(b.Status, ShouldEqual, evergreen.BuildFailed)
			v, err := version.FindOne(version.ById(v.Id))
			So(v.Status, ShouldEqual, evergreen.VersionFailed)

		})

	})
}

// prependConfigToVersion modifies the project config with the given id
func prependConfigToVersion(t *testing.T, versionId, configData string) {
	v, err := version.FindOne(version.ById(versionId))
	testutil.HandleTestingErr(err, t, "failed to load version")
	if v == nil {
		err = fmt.Errorf("could not find version to update")
		testutil.HandleTestingErr(err, t, "failed to find version")
	}
	v.Config = configData + v.Config
	testutil.HandleTestingErr(dbutil.ClearCollections(version.Collection), t, "couldnt reset version")
	testutil.HandleTestingErr(v.Insert(), t, "failed to insert version")
}

func TestMarkStart(t *testing.T) {
	Convey("With a task, build and version", t, func() {
		testutil.HandleTestingErr(db.ClearCollections(task.Collection, build.Collection, version.Collection), t,
			"Error clearing task and build collections")
		displayName := "testName"
		b := &build.Build{
			Id:      "buildtest",
			Status:  evergreen.BuildCreated,
			Version: "abc",
		}
		v := &version.Version{
			Id:     b.Version,
			Status: evergreen.VersionCreated,
		}
		testTask := task.Task{
			Id:          "testTask",
			DisplayName: displayName,
			Activated:   true,
			BuildId:     b.Id,
			Project:     "sample",
			Status:      evergreen.TaskUndispatched,
			Version:     b.Version,
		}

		b.Tasks = []build.TaskCache{
			{
				Id:     testTask.Id,
				Status: evergreen.TaskUndispatched,
			},
		}
		So(b.Insert(), ShouldBeNil)
		So(testTask.Insert(), ShouldBeNil)
		So(v.Insert(), ShouldBeNil)
		Convey("when calling MarkStart, the task, version and build should be updated", func() {
			So(MarkStart(testTask.Id), ShouldBeNil)
			testTask, err := task.FindOne(task.ById(testTask.Id))
			So(err, ShouldBeNil)
			So(testTask.Status, ShouldEqual, evergreen.TaskStarted)
			b, err := build.FindOne(build.ById(b.Id))
			So(err, ShouldBeNil)
			So(b.Status, ShouldEqual, evergreen.BuildStarted)
			So(b.Tasks, ShouldNotBeNil)
			So(len(b.Tasks), ShouldEqual, 1)
			So(b.Tasks[0].Status, ShouldEqual, evergreen.TaskStarted)
			v, err := version.FindOne(version.ById(v.Id))
			So(err, ShouldBeNil)
			So(v.Status, ShouldEqual, evergreen.VersionStarted)
		})
	})
}

// Verifies that the given revision order number is higher than the latest number stored for the project.
func sanityCheckOrderNum(revOrderNum int, projectId string) error {
	latest, err := version.FindOne(version.ByMostRecentForRequester(projectId, evergreen.RepotrackerVersionRequester))
	if err != nil {
		return fmt.Errorf("Error getting latest version: %v", err.Error())
	}

	// When there are no versions in the db yet, sanity check is moot
	if latest != nil {
		if revOrderNum <= latest.RevisionOrderNumber {
			return fmt.Errorf("Commit order number isn't greater than last stored version's: %v <= %v",
				revOrderNum, latest.RevisionOrderNumber)
		}
	}
	return nil
}

func (as *APIServer) GetVersion(w http.ResponseWriter, r *http.Request) {
	task := MustHaveTask(r)

	// Get the version for this task, so we can get its config data
	v, err := version.FindOne(version.ById(task.Version))
	if err != nil {
		as.LoggedError(w, r, http.StatusInternalServerError, err)
		return
	}

	if v == nil {
		http.Error(w, "version not found", http.StatusNotFound)
		return
	}

	as.WriteJSON(w, http.StatusOK, v)
}

// Construct a map of project names to build variants for that project
func findProjectBuildVariants(configName string) (map[string][]string, error) {
	projectNameToBuildVariants := make(map[string][]string)

	allProjects, err := model.FindAllTrackedProjectRefs()
	if err != nil {
		return nil, err
	}

	for _, projectRef := range allProjects {
		if !projectRef.Enabled {
			continue
		}
		var buildVariants []string
		var proj *model.Project
		var err error
		if projectRef.LocalConfig != "" {
			proj, err = model.FindProject("", &projectRef)
			if err != nil {
				return nil, fmt.Errorf("unable to find project file: %v", err)
			}
		} else {
			lastGood, err := version.FindOne(version.ByLastKnownGoodConfig(projectRef.Identifier))
			if err != nil {
				return nil, fmt.Errorf("unable to find last valid config: %v", err)
			}
			if lastGood == nil { // brand new project + no valid config yet, just return an empty map
				return projectNameToBuildVariants, nil
			}

			proj = &model.Project{}
			err = model.LoadProjectInto([]byte(lastGood.Config), projectRef.Identifier, proj)
			if err != nil {
				return nil, fmt.Errorf("error loading project '%v' from version: %v", projectRef.Identifier, err)
			}
		}

		for _, buildVariant := range proj.BuildVariants {
			buildVariants = append(buildVariants, buildVariant.Name)
		}

		projectNameToBuildVariants[projectRef.Identifier] = buildVariants
	}

	return projectNameToBuildVariants, nil
}

// populateTaskBuildVersion takes a task, build, and version ID and populates a projectContext
// with as many of the task, build, and version documents as possible.
// If any of the provided IDs is blank, they will be inferred from the more selective ones.
// Returns the project ID of the data found, which may be blank if the IDs are empty.
func (pc *projectContext) populateTaskBuildVersion(taskId, buildId, versionId string) (string, error) {
	projectId := ""
	var err error
	// Fetch task if there's a task ID present; if we find one, populate build/version IDs from it
	if len(taskId) > 0 {
		pc.Task, err = task.FindOne(task.ById(taskId))
		if err != nil {
			return "", err
		}

		if pc.Task != nil {
			// override build and version ID with the ones this task belongs to
			buildId = pc.Task.BuildId
			versionId = pc.Task.Version
			projectId = pc.Task.Project
		}
	}

	// Fetch build if there's a build ID present; if we find one, populate version ID from it
	if len(buildId) > 0 {
		pc.Build, err = build.FindOne(build.ById(buildId))
		if err != nil {
			return "", err
		}
		if pc.Build != nil {
			versionId = pc.Build.Version
			projectId = pc.Build.Project
		}
	}
	if len(versionId) > 0 {
		pc.Version, err = version.FindOne(version.ById(versionId))
		if err != nil {
			return "", err
		}
		if pc.Version != nil {
			projectId = pc.Version.Identifier
		}
	}
	return projectId, nil

}

func (self *TaskNotificationHandler) constructChangeInfo(allTasks []task.Task,
	key *NotificationKey) ([]ChangeInfo, error) {
	changeInfoSlice := make([]ChangeInfo, 0)

	for _, task := range allTasks {
		// add blamelist information for each task
		v, err := version.FindOne(version.ById(task.Version))
		if err != nil {
			return changeInfoSlice, err
		}
		if v == nil {
			return changeInfoSlice, fmt.Errorf("No version found for task %v with version id %v",
				task.Id, task.Version)
		}
		changeInfo := constructChangeInfo(v, key)
		changeInfo.Pushtime = task.PushTime.Format(time.RFC850)
		changeInfoSlice = append(changeInfoSlice, *changeInfo)
	}

	return changeInfoSlice, nil
}

func (self *BuildNotificationHandler) constructChangeInfo(allBuilds []build.Build,
	key *NotificationKey) ([]ChangeInfo, error) {
	changeInfoSlice := make([]ChangeInfo, 0)

	for _, build := range allBuilds {
		// add blamelist information for each build
		v, err := version.FindOne(version.ById(build.Version))
		if err != nil {
			return changeInfoSlice, err
		}

		if v == nil {
			err = fmt.Errorf("No version found for build %v with version id %v",
				build.Id, build.Version)
			return changeInfoSlice, err
		}
		changeInfo := constructChangeInfo(v, key)
		changeInfo.Pushtime = build.PushTime.Format(time.RFC850)
		changeInfoSlice = append(changeInfoSlice, *changeInfo)
	}
	return changeInfoSlice, nil
}

// Modifies part of the version specified in the request, and returns a
// JSON response with the marshalled output of its new state.
func (restapi restAPI) modifyVersionInfo(w http.ResponseWriter, r *http.Request) {
	versionId := mux.Vars(r)["version_id"]

	var input struct {
		Activated *bool `json:"activated"`
	}
	json.NewDecoder(r.Body).Decode(&input)

	v, err := version.FindOne(version.ById(versionId))
	if err != nil || v == nil {
		msg := fmt.Sprintf("Error finding version '%v'", versionId)
		statusCode := http.StatusNotFound

		if err != nil {
			evergreen.Logger.Logf(slogger.ERROR, "%v: %v", msg, err)
			statusCode = http.StatusInternalServerError
		}

		restapi.WriteJSON(w, statusCode, responseError{Message: msg})
		return
	}

	if input.Activated != nil {
		if err = model.SetVersionActivation(v.Id, *input.Activated); err != nil {
			state := "inactive"
			if *input.Activated {
				state = "active"
			}

			msg := fmt.Sprintf("Error marking version '%v' as %v", versionId, state)
			restapi.WriteJSON(w, http.StatusInternalServerError, responseError{Message: msg})
			return
		}
	}

	restapi.getVersionInfo(w, r)
}

// Takes in a version id and a map of "key -> buildvariant" (where "key" is of
// type "versionBuildVariant") and updates the map with an entry for the
// buildvariants associated with "versionStr"
func (self *Scheduler) updateVersionBuildVarMap(versionStr string,
	versionBuildVarMap map[versionBuildVariant]model.BuildVariant) (err error) {
	version, err := version.FindOne(version.ById(versionStr))
	if err != nil {
		return
	}
	if version == nil {
		return fmt.Errorf("nil version returned for version id '%v'", versionStr)
	}
	project := &model.Project{}

	err = model.LoadProjectInto([]byte(version.Config), version.Identifier, project)
	if err != nil {
		return fmt.Errorf("unable to load project config for version %v: "+
			"%v", versionStr, err)
	}

	// create buildvariant map (for accessing purposes)
	for _, buildVariant := range project.BuildVariants {
		key := versionBuildVariant{versionStr, buildVariant.Name}
		versionBuildVarMap[key] = buildVariant
	}
	return
}