Enable perfsprint in golangci-lint

.golangci.yml

@@ -23,6 +23,7 @@ linters:
     - testifylint
     - godot
     - copyloopvar
+    - perfsprint
 
 issues:
   max-same-issues: 0

cmd/pint/ci.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"log/slog"
 	"os"
@@ -80,7 +81,7 @@ func actionCI(c *cli.Context) error {
 	}
 	currentBranch, err := git.CurrentBranch(git.RunGit)
 	if err != nil {
-		return fmt.Errorf("failed to get the name of current branch")
+		return errors.New("failed to get the name of current branch")
 	}
 	slog.Debug("Got branch information", slog.String("base", baseBranch), slog.String("current", currentBranch))
 	if currentBranch == strings.Split(baseBranch, "/")[len(strings.Split(baseBranch, "/"))-1] {
@@ -134,7 +135,7 @@ func actionCI(c *cli.Context) error {
 	if meta.cfg.Repository != nil && meta.cfg.Repository.BitBucket != nil {
 		token, ok := os.LookupEnv("BITBUCKET_AUTH_TOKEN")
 		if !ok {
-			return fmt.Errorf("BITBUCKET_AUTH_TOKEN env variable is required when reporting to BitBucket")
+			return errors.New("BITBUCKET_AUTH_TOKEN env variable is required when reporting to BitBucket")
 		}
 
 		timeout, _ := time.ParseDuration(meta.cfg.Repository.BitBucket.Timeout)
@@ -154,7 +155,7 @@ func actionCI(c *cli.Context) error {
 	if meta.cfg.Repository != nil && meta.cfg.Repository.GitLab != nil {
 		token, ok := os.LookupEnv("GITLAB_AUTH_TOKEN")
 		if !ok {
-			return fmt.Errorf("GITLAB_AUTH_TOKEN env variable is required when reporting to GitLab")
+			return errors.New("GITLAB_AUTH_TOKEN env variable is required when reporting to GitLab")
 		}
 
 		timeout, _ := time.ParseDuration(meta.cfg.Repository.GitLab.Timeout)
@@ -177,12 +178,12 @@ func actionCI(c *cli.Context) error {
 	if meta.cfg.Repository != nil && meta.cfg.Repository.GitHub != nil {
 		token, ok := os.LookupEnv("GITHUB_AUTH_TOKEN")
 		if !ok {
-			return fmt.Errorf("GITHUB_AUTH_TOKEN env variable is required when reporting to GitHub")
+			return errors.New("GITHUB_AUTH_TOKEN env variable is required when reporting to GitHub")
 		}
 
 		prVal, ok := os.LookupEnv("GITHUB_PULL_REQUEST_NUMBER")
 		if !ok {
-			return fmt.Errorf("GITHUB_PULL_REQUEST_NUMBER env variable is required when reporting to GitHub")
+			return errors.New("GITHUB_PULL_REQUEST_NUMBER env variable is required when reporting to GitHub")
 		}
 
 		var prNum int
@@ -234,7 +235,7 @@ func actionCI(c *cli.Context) error {
 	}
 
 	if problemsFound {
-		return fmt.Errorf("problems found")
+		return errors.New("problems found")
 	}
 
 	return nil

cmd/pint/lint.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"log/slog"
 	"os"
@@ -58,7 +59,7 @@ func actionLint(c *cli.Context) error {
 
 	paths := c.Args().Slice()
 	if len(paths) == 0 {
-		return fmt.Errorf("at least one file or directory required")
+		return errors.New("at least one file or directory required")
 	}
 
 	slog.Info("Finding all rules to check", slog.Any("paths", paths))

cmd/pint/parse.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"strings"
 
@@ -123,7 +124,7 @@ func actionParse(c *cli.Context) (err error) {
 
 	parts := c.Args().Slice()
 	if len(parts) == 0 {
-		return fmt.Errorf("a query string is required")
+		return errors.New("a query string is required")
 	}
 	query := strings.Join(parts, " ")
 	return parseQuery(query)

cmd/pint/scan.go

@@ -218,7 +218,7 @@ func scanWorker(ctx context.Context, jobs <-chan scanJob, results chan<- reporte
 							Last:  commentErr.Line,
 						},
 						Reporter: pintCommentReporter,
-						Text:     fmt.Sprintf("This comment is not a valid pint control comment: %s", commentErr.Error()),
+						Text:     "This comment is not a valid pint control comment: " + commentErr.Error(),
 						Severity: checks.Warning,
 					},
 					Owner: job.entry.Owner,

cmd/pint/watch.go

@@ -52,7 +52,7 @@ var watchCmd = &cli.Command{
 
 				paths := c.Args().Slice()
 				if len(paths) == 0 {
-					return fmt.Errorf("at least one file or directory required")
+					return errors.New("at least one file or directory required")
 				}
 
 				slog.Debug("Starting glob watch", slog.Any("paths", paths))
@@ -72,7 +72,7 @@ var watchCmd = &cli.Command{
 
 				args := c.Args().Slice()
 				if len(args) != 1 {
-					return fmt.Errorf("exactly one argument required with the URI of Prometheus server to query")
+					return errors.New("exactly one argument required with the URI of Prometheus server to query")
 				}
 
 				gen := config.NewPrometheusGenerator(meta.cfg, prometheus.NewRegistry())

internal/checks/alerts_annotation.go

@@ -165,7 +165,7 @@ func (c AnnotationCheck) checkValue(rule parser.Rule, value string, lines parser
 
 func maybeComment(c string) string {
 	if c != "" {
-		return fmt.Sprintf("Rule comment: %s", c)
+		return "Rule comment: " + c
 	}
 	return ""
 }

internal/checks/promql_series.go

@@ -614,7 +614,7 @@ func (c SeriesCheck) getMinAge(rule parser.Rule, selector promParser.VectorSelec
 	minAge = time.Hour * 2
 	bareSelector := stripLabels(selector)
 	prefixes := []string{
-		fmt.Sprintf("%s min-age ", c.Reporter()),
+		c.Reporter() + " min-age ",
 		fmt.Sprintf("%s(%s) min-age ", c.Reporter(), bareSelector.String()),
 		fmt.Sprintf("%s(%s) min-age ", c.Reporter(), selector.String()),
 	}

internal/checks/rule_link_test.go

@@ -210,7 +210,7 @@ func TestRuleLinkCheck(t *testing.T) {
 			checker: func(_ *promapi.FailoverGroup) checks.RuleChecker {
 				return checks.NewRuleLinkCheck(
 					checks.MustTemplatedRegexp("http://(.*)"),
-					fmt.Sprintf(srv.URL+"/rewrite"),
+					srv.URL+"/rewrite",
 					time.Second,
 					map[string]string{"X-Host": "rewrite.example.com"},
 					"",

internal/comments/comments_test.go

@@ -55,7 +55,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf(`unexpected comment suffix: "this file"`),
+						Err:  errors.New(`unexpected comment suffix: "this file"`),
 					}},
 				},
 			},
@@ -73,7 +73,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf(`unexpected comment suffix: "this line"`),
+						Err:  errors.New(`unexpected comment suffix: "this line"`),
 					}},
 				},
 			},
@@ -91,7 +91,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf(`unexpected comment suffix: "here"`),
+						Err:  errors.New(`unexpected comment suffix: "here"`),
 					}},
 				},
 			},
@@ -109,7 +109,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf(`unexpected comment suffix: "here"`),
+						Err:  errors.New(`unexpected comment suffix: "here"`),
 					}},
 				},
 			},
@@ -127,7 +127,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf(`unexpected comment suffix: "here"`),
+						Err:  errors.New(`unexpected comment suffix: "here"`),
 					}},
 				},
 			},
@@ -145,7 +145,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf("missing file/owner value"),
+						Err:  errors.New("missing file/owner value"),
 					}},
 				},
 			},
@@ -166,7 +166,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf("missing rule/owner value"),
+						Err:  errors.New("missing rule/owner value"),
 					}},
 				},
 			},
@@ -187,7 +187,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf("missing file/disable value"),
+						Err:  errors.New("missing file/disable value"),
 					}},
 				},
 			},
@@ -208,7 +208,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf("missing disable value"),
+						Err:  errors.New("missing disable value"),
 					}},
 				},
 			},
@@ -238,7 +238,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf("missing file/snooze value"),
+						Err:  errors.New("missing file/snooze value"),
 					}},
 				},
 			},
@@ -250,7 +250,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf(`invalid snooze comment, expected '$TIME $MATCH' got "2023-12-31"`),
+						Err:  errors.New(`invalid snooze comment, expected '$TIME $MATCH' got "2023-12-31"`),
 					}},
 				},
 			},
@@ -262,7 +262,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf(`invalid snooze comment, expected '$TIME $MATCH' got "abc"`),
+						Err:  errors.New(`invalid snooze comment, expected '$TIME $MATCH' got "abc"`),
 					}},
 				},
 			},
@@ -298,7 +298,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf("missing snooze value"),
+						Err:  errors.New("missing snooze value"),
 					}},
 				},
 			},
@@ -310,7 +310,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf(`invalid snooze comment, expected '$TIME $MATCH' got "2023-12-31"`),
+						Err:  errors.New(`invalid snooze comment, expected '$TIME $MATCH' got "2023-12-31"`),
 					}},
 				},
 			},
@@ -322,7 +322,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf(`invalid snooze comment, expected '$TIME $MATCH' got "abc"`),
+						Err:  errors.New(`invalid snooze comment, expected '$TIME $MATCH' got "abc"`),
 					}},
 				},
 			},
@@ -370,7 +370,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf("missing rule/set value"),
+						Err:  errors.New("missing rule/set value"),
 					}},
 				},
 			},
@@ -452,7 +452,7 @@ func TestParse(t *testing.T) {
 					Type: comments.InvalidComment,
 					Value: comments.Invalid{Err: comments.CommentError{
 						Line: 1,
-						Err:  fmt.Errorf(`unexpected comment suffix: "# pint ignore/file"`),
+						Err:  errors.New(`unexpected comment suffix: "# pint ignore/file"`),
 					}},
 				},
 			},

internal/config/config.go

@@ -208,7 +208,7 @@ func getContext() *hcl.EvalContext {
 	vars := map[string]cty.Value{}
 	for _, e := range os.Environ() {
 		if k, v, ok := strings.Cut(e, "="); ok {
-			vars[fmt.Sprintf("ENV_%s", k)] = cty.StringVal(v)
+			vars["ENV_"+k] = cty.StringVal(v)
 		}
 	}
 	return &hcl.EvalContext{Variables: vars}

internal/config/cost.go

@@ -1,7 +1,7 @@
 package config
 
 import (
-	"fmt"
+	"errors"
 
 	"github.com/cloudflare/pint/internal/checks"
 )
@@ -22,13 +22,13 @@ func (cs CostSettings) validate() error {
 		}
 	}
 	if cs.MaxSeries < 0 {
-		return fmt.Errorf("maxSeries value must be >= 0")
+		return errors.New("maxSeries value must be >= 0")
 	}
 	if cs.MaxTotalSamples < 0 {
-		return fmt.Errorf("maxTotalSamples value must be >= 0")
+		return errors.New("maxTotalSamples value must be >= 0")
 	}
 	if cs.MaxPeakSamples < 0 {
-		return fmt.Errorf("maxPeakSamples value must be >= 0")
+		return errors.New("maxPeakSamples value must be >= 0")
 	}
 	if cs.MaxEvaluationDuration != "" {
 		if _, err := parseDuration(cs.MaxEvaluationDuration); err != nil {

internal/config/match.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"regexp"
 	"strings"
@@ -76,7 +77,7 @@ func (m Match) validate(allowEmpty bool) error {
 	}
 
 	if !allowEmpty && m.Path == "" && m.Name == "" && m.Kind == "" && m.Label == nil && m.Annotation == nil && m.Command == nil && m.For == "" {
-		return fmt.Errorf("ignore block must have at least one condition")
+		return errors.New("ignore block must have at least one condition")
 	}
 
 	return nil

internal/config/prometheus.go

@@ -29,7 +29,7 @@ type TLSConfig struct {
 
 func (t TLSConfig) validate() error {
 	if (t.ClientCert != "") != (t.ClientKey != "") {
-		return fmt.Errorf("clientCert and clientKey must be set together")
+		return errors.New("clientCert and clientKey must be set together")
 	}
 	return nil
 }