[GITEA] Use existing error functionality

- There's no need to use `github.com/pkg/errors` when the standard
library already has the functionality to wrap and create errors.

(cherry picked from commit 40f603a538)
(cherry picked from commit aa68a2753f)
(cherry picked from commit 48e252d739)
(cherry picked from commit cc6f40ccd2)
(cherry picked from commit 03c4b97358)
(cherry picked from commit f25eeb7695)
(cherry picked from commit 989d8fa1cb)
(cherry picked from commit 10e890ed8e)

go.mod

@@ -83,7 +83,6 @@ require (
 	github.com/olivere/elastic/v7 v7.0.32
 	github.com/opencontainers/go-digest v1.0.0
 	github.com/opencontainers/image-spec v1.1.0-rc5
-	github.com/pkg/errors v0.9.1
 	github.com/pquerna/otp v1.4.0
 	github.com/prometheus/client_golang v1.17.0
 	github.com/quasoft/websspi v1.1.2
@@ -245,6 +244,7 @@ require (
 	github.com/pelletier/go-toml/v2 v2.1.1 // indirect
 	github.com/pierrec/lz4/v4 v4.1.19 // indirect
 	github.com/pjbgf/sha1cd v0.3.0 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/prometheus/client_model v0.5.0 // indirect
 	github.com/prometheus/common v0.45.0 // indirect

services/pull/commit_status.go

@@ -6,6 +6,8 @@ package pull
 
 import (
 	"context"
+	"errors"
+	"fmt"
 
 	"code.gitea.io/gitea/models/db"
 	git_model "code.gitea.io/gitea/models/git"
@@ -15,7 +17,6 @@ import (
 	"code.gitea.io/gitea/modules/structs"
 
 	"github.com/gobwas/glob"
-	"github.com/pkg/errors"
 )
 
 // MergeRequiredContextsCommitStatus returns a commit status state for given required contexts
@@ -95,7 +96,7 @@ func IsCommitStatusContextSuccess(commitStatuses []*git_model.CommitStatus, requ
 func IsPullCommitStatusPass(ctx context.Context, pr *issues_model.PullRequest) (bool, error) {
 	pb, err := git_model.GetFirstMatchProtectedBranchRule(ctx, pr.BaseRepoID, pr.BaseBranch)
 	if err != nil {
-		return false, errors.Wrap(err, "GetLatestCommitStatus")
+		return false, fmt.Errorf("GetFirstMatchProtectedBranchRule: %w", err)
 	}
 	if pb == nil || !pb.EnableStatusCheck {
 		return true, nil
@@ -112,21 +113,21 @@ func IsPullCommitStatusPass(ctx context.Context, pr *issues_model.PullRequest) (
 func GetPullRequestCommitStatusState(ctx context.Context, pr *issues_model.PullRequest) (structs.CommitStatusState, error) {
 	// Ensure HeadRepo is loaded
 	if err := pr.LoadHeadRepo(ctx); err != nil {
-		return "", errors.Wrap(err, "LoadHeadRepo")
+		return "", fmt.Errorf("LoadHeadRepo: %w", err)
 	}
 
 	// check if all required status checks are successful
 	headGitRepo, closer, err := git.RepositoryFromContextOrOpen(ctx, pr.HeadRepo.RepoPath())
 	if err != nil {
-		return "", errors.Wrap(err, "OpenRepository")
+		return "", fmt.Errorf("RepositoryFromContextOrOpen: %w", err)
 	}
 	defer closer.Close()
 
 	if pr.Flow == issues_model.PullRequestFlowGithub && !headGitRepo.IsBranchExist(pr.HeadBranch) {
-		return "", errors.New("Head branch does not exist, can not merge")
+		return "", errors.New("head branch does not exist, can not merge")
 	}
 	if pr.Flow == issues_model.PullRequestFlowAGit && !git.IsReferenceExist(ctx, headGitRepo.Path, pr.GetGitRefName()) {
-		return "", errors.New("Head branch does not exist, can not merge")
+		return "", errors.New("head branch does not exist, can not merge")
 	}
 
 	var sha string
@@ -140,17 +141,17 @@ func GetPullRequestCommitStatusState(ctx context.Context, pr *issues_model.PullR
 	}
 
 	if err := pr.LoadBaseRepo(ctx); err != nil {
-		return "", errors.Wrap(err, "LoadBaseRepo")
+		return "", fmt.Errorf("LoadBaseRepo: %w", err)
 	}
 
 	commitStatuses, _, err := git_model.GetLatestCommitStatus(ctx, pr.BaseRepo.ID, sha, db.ListOptions{ListAll: true})
 	if err != nil {
-		return "", errors.Wrap(err, "GetLatestCommitStatus")
+		return "", fmt.Errorf("GetLatestCommitStatus: %w", err)
 	}
 
 	pb, err := git_model.GetFirstMatchProtectedBranchRule(ctx, pr.BaseRepoID, pr.BaseBranch)
 	if err != nil {
-		return "", errors.Wrap(err, "LoadProtectedBranch")
+		return "", fmt.Errorf("GetFirstMatchProtectedBranchRule: %w", err)
 	}
 	var requiredContexts []string
 	if pb != nil {