refactor: tidy poller, web test helper and GoDoc line widths (#9)

internal/agent/updater/compose.go

@@ -91,10 +91,10 @@ func NewComposeExecutor(cli ComposeDocker, resolve *Resolver, selfID string, run
 	return &ComposeExecutor{cli: cli, resolve: resolve, selfID: selfID, run: run, build: NewBuildChecker(cli, selfID, runOut)}
 }
 
-// Execute pins job.Ref to its current digest (a ref that has one is used as is), writes it to the stack's
-// override file and recreates the service. Working directory and config
-// files come from the service's container labels on this machine, never from
-// the job. It returns the pinned ref.
+// Execute pins job.Ref to its current digest (a ref that has one is used as
+// is), writes it to the stack's override file and recreates the service.
+// Working directory and config files come from the service's container
+// labels on this machine, never from the job. It returns the pinned ref.
 func (e *ComposeExecutor) Execute(ctx context.Context, job protocol.JobStart, out io.Writer) (string, error) {
 	project, service := job.ComposeProject, job.ComposeService
 	cts, err := e.cli.ContainerList(ctx, container.ListOptions{

internal/agent/updater/swarm.go

@@ -35,11 +35,11 @@ func NewSwarmExecutor(cli SwarmClient, resolve *Resolver, auth *RegistryAuth) *S
 }
 
 // Execute checks that the local daemon is a manager of the job's cluster,
-// pins job.Ref to its current digest (a ref that has one is used as is) and updates the service to it. The
-// update is addressed by the ID and version of the service that was
-// inspected, so it changes exactly that object. Success means the daemon
-// accepted the new spec, not that the tasks have converged. It returns the
-// pinned ref.
+// pins job.Ref to its current digest (a ref that has one is used as is) and
+// updates the service to it. The update is addressed by the ID and version of
+// the service that was inspected, so it changes exactly that object. Success
+// means the daemon accepted the new spec, not that the tasks have converged.
+// It returns the pinned ref.
 func (e *SwarmExecutor) Execute(ctx context.Context, job protocol.JobStart, out io.Writer) (string, error) {
 	info, err := e.cli.Info(ctx)
 	if err != nil {