Add additional linting

.pre-commit-config.yaml

@@ -12,8 +12,7 @@ repos:
     hooks:
       - id: go-fmt
       - id: go-imports
-      # - id: gometalinter
-      # - id: golangci-lint
+      - id: golangci-lint
   - repo: https://github.com/IamTheFij/docker-pre-commit
     rev: v2.0.0
     hooks:

main.go

@@ -71,6 +71,7 @@ func (job ContainerStartJob) Run() {
 
 	if containerJSON.State.Running {
 		slog.Warningf("Container is already running. Skipping %s", job.name)
+
 		return
 	}
 
@@ -103,7 +104,6 @@ func (job ContainerStartJob) Run() {
 			containerJSON.State.ExitCode,
 		)
 	}
-
 }
 
 // Name returns the name of the job
@@ -141,6 +141,7 @@ func (job ContainerExecJob) Run() {
 
 	if !containerJSON.State.Running {
 		slog.Warningf("Container not running. Skipping %s", job.name)
+
 		return
 	}
 
@@ -169,11 +170,14 @@ func (job ContainerExecJob) Run() {
 			execID.ID,
 		)
 		slog.Debugf("Exec info: %+v", execInfo)
+
 		if err != nil {
 			// Nothing we can do if we got an error here, so let's go
 			slog.OnErrWarnf(err, "Could not get status for exec job %s", job.name)
+
 			return
 		}
+
 		time.Sleep(1 * time.Second)
 	}
 	slog.Debugf("Done execing %s. %+v", job.name, execInfo)
@@ -198,6 +202,7 @@ func QueryScheduledJobs(client ContainerClient) (jobs []ContainerCronJob) {
 		// Add start job
 		if val, ok := container.Labels[schedLabel]; ok {
 			jobName := strings.Join(container.Names, "/")
+
 			jobs = append(jobs, ContainerStartJob{
 				client:      client,
 				containerID: container.ID,
@@ -209,9 +214,12 @@ func QueryScheduledJobs(client ContainerClient) (jobs []ContainerCronJob) {
 
 		// Add exec jobs
 		execJobs := map[string]map[string]string{}
+
 		for label, value := range container.Labels {
 			results := execLabelRegexp.FindStringSubmatch(label)
-			if len(results) == 3 {
+			expectedLabelParts := 3
+
+			if len(results) == expectedLabelParts {
 				// We've got part of a new job
 				jobName, jobField := results[1], results[2]
 				if partJob, ok := execJobs[jobName]; ok {
@@ -225,15 +233,18 @@ func QueryScheduledJobs(client ContainerClient) (jobs []ContainerCronJob) {
 				}
 			}
 		}
+
 		for jobName, jobConfig := range execJobs {
 			schedule, ok := jobConfig["schedule"]
 			if !ok {
 				continue
 			}
+
 			shellCommand, ok := jobConfig["command"]
 			if !ok {
 				continue
 			}
+
 			jobs = append(jobs, ContainerExecJob{
 				ContainerStartJob: ContainerStartJob{
 					client:      client,
@@ -247,7 +258,7 @@ func QueryScheduledJobs(client ContainerClient) (jobs []ContainerCronJob) {
 		}
 	}
 
-	return
+	return jobs
 }
 
 // ScheduleJobs accepts a Cron instance and a list of jobs to schedule.
@@ -266,6 +277,7 @@ func ScheduleJobs(c *cron.Cron, jobs []ContainerCronJob) {
 			// unschedule it later
 			slog.Debugf("Job %s is already scheduled. Skipping", job.Name())
 			delete(existingJobs, job.UniqueName())
+
 			continue
 		}
 
@@ -299,14 +311,14 @@ func ScheduleJobs(c *cron.Cron, jobs []ContainerCronJob) {
 func main() {
 	// Get a Docker Client
 	client, err := dockerClient.NewClientWithOpts(dockerClient.FromEnv)
-	if err != nil {
-		panic(err)
-	}
+	slog.OnErrPanicf(err, "Could not create Docker client")
 
 	// Read interval for polling Docker
 	var watchInterval time.Duration
+
+	showVersion := flag.Bool("version", false, "Display the version of dockron and exit")
+
 	flag.DurationVar(&watchInterval, "watch", defaultWatchInterval, "Interval used to poll Docker for changes")
-	var showVersion = flag.Bool("version", false, "Display the version of dockron and exit")
 	flag.BoolVar(&slog.DebugLevel, "debug", false, "Show debug logs")
 	flag.Parse()
 

main_test.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"log"
 	"reflect"
@@ -29,6 +30,8 @@ var (
 			},
 		},
 	}
+
+	errGeneric = errors.New("error")
 )
 
 // FakeCall represents a faked method call
@@ -75,6 +78,7 @@ func (fakeClient *FakeDockerClient) ContainerStart(context context.Context, cont
 	if results[0] != nil {
 		e = results[0].(error)
 	}
+
 	return
 }
 
@@ -83,9 +87,11 @@ func (fakeClient *FakeDockerClient) ContainerList(context context.Context, optio
 	if results[0] != nil {
 		c = results[0].([]dockerTypes.Container)
 	}
+
 	if results[1] != nil {
 		e = results[1].(error)
 	}
+
 	return
 }
 
@@ -94,9 +100,11 @@ func (fakeClient *FakeDockerClient) ContainerExecCreate(ctx context.Context, con
 	if results[0] != nil {
 		r = results[0].(dockerTypes.IDResponse)
 	}
+
 	if results[1] != nil {
 		e = results[1].(error)
 	}
+
 	return
 }
 
@@ -105,6 +113,7 @@ func (fakeClient *FakeDockerClient) ContainerExecStart(ctx context.Context, exec
 	if results[0] != nil {
 		e = results[0].(error)
 	}
+
 	return
 }
 
@@ -113,9 +122,11 @@ func (fakeClient *FakeDockerClient) ContainerExecInspect(ctx context.Context, ex
 	if results[0] != nil {
 		r = results[0].(dockerTypes.ContainerExecInspect)
 	}
+
 	if results[1] != nil {
 		e = results[1].(error)
 	}
+
 	return
 }
 
@@ -124,9 +135,11 @@ func (fakeClient *FakeDockerClient) ContainerInspect(ctx context.Context, contai
 	if results[0] != nil {
 		r = results[0].(dockerTypes.ContainerJSON)
 	}
+
 	if results[1] != nil {
 		e = results[1].(error)
 	}
+
 	return
 }
 
@@ -653,8 +666,8 @@ func TestDoLoop(t *testing.T) {
 // to a subpackage that offers a single function for interfacing with the
 // Docker client to start or exec a container so that Dockron needn't care.
 func TestRunExecJobs(t *testing.T) {
-
 	var jobContext context.Context
+
 	jobContainerID := "container_id"
 	jobCommand := "true"
 
@@ -669,7 +682,7 @@ func TestRunExecJobs(t *testing.T) {
 			client: &FakeDockerClient{
 				FakeResults: map[string][]FakeResult{
 					"ContainerInspect": []FakeResult{
-						FakeResult{nil, fmt.Errorf("error")},
+						FakeResult{nil, errGeneric},
 					},
 				},
 			},
@@ -703,7 +716,7 @@ func TestRunExecJobs(t *testing.T) {
 						FakeResult{runningContainerInfo, nil},
 					},
 					"ContainerExecCreate": []FakeResult{
-						FakeResult{nil, fmt.Errorf("fail")},
+						FakeResult{nil, errGeneric},
 					},
 				},
 			},
@@ -734,7 +747,7 @@ func TestRunExecJobs(t *testing.T) {
 						FakeResult{dockerTypes.IDResponse{ID: "id"}, nil},
 					},
 					"ContainerExecStart": []FakeResult{
-						FakeResult{fmt.Errorf("fail")},
+						FakeResult{errGeneric},
 					},
 				},
 			},
@@ -771,7 +784,7 @@ func TestRunExecJobs(t *testing.T) {
 						FakeResult{nil},
 					},
 					"ContainerExecInspect": []FakeResult{
-						FakeResult{nil, fmt.Errorf("fail")},
+						FakeResult{nil, errGeneric},
 					},
 				},
 			},
@@ -877,6 +890,7 @@ func TestRunExecJobs(t *testing.T) {
 // Docker client to start or exec a container so that Dockron needn't care.
 func TestRunStartJobs(t *testing.T) {
 	var jobContext context.Context
+
 	jobContainerID := "container_id"
 
 	cases := []struct {
@@ -890,7 +904,7 @@ func TestRunStartJobs(t *testing.T) {
 			client: &FakeDockerClient{
 				FakeResults: map[string][]FakeResult{
 					"ContainerInspect": []FakeResult{
-						FakeResult{nil, fmt.Errorf("error")},
+						FakeResult{nil, errGeneric},
 					},
 				},
 			},
@@ -923,7 +937,7 @@ func TestRunStartJobs(t *testing.T) {
 					"ContainerInspect": []FakeResult{
 						FakeResult{stoppedContainerInfo, nil},
 					},
-					"ContainerStart": []FakeResult{FakeResult{fmt.Errorf("fail")}},
+					"ContainerStart": []FakeResult{FakeResult{errGeneric}},
 				},
 			},
 			expectedCalls: map[string][]FakeCall{
@@ -936,7 +950,7 @@ func TestRunStartJobs(t *testing.T) {
 			},
 		},
 		{
-			name: "Succesfully start a container",
+			name: "Successfully start a container",
 			client: &FakeDockerClient{
 				FakeResults: map[string][]FakeResult{
 					"ContainerInspect": []FakeResult{
@@ -974,14 +988,13 @@ func TestRunStartJobs(t *testing.T) {
 
 			defer func() {
 				// Recover from panics, if there were any
-				recover()
+				_ = recover()
 				c.client.AssertFakeCalls(t, c.expectedCalls, "Failed")
 			}()
 			job.Run()
 			if c.expectPanic {
 				t.Errorf("Expected panic but got none")
 			}
-
 		})
 	}
 }