Update gitea-vet to v0.2.1 (#12282)

* change to new code location

* vendor

* tagged version v0.2.0

* gitea-vet v0.2.1

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

vendor/code.gitea.io/gitea-vet/checks/migrations.go

@@ -0,0 +1,77 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package checks
+
+import (
+	"errors"
+	"os/exec"
+	"strings"
+
+	"golang.org/x/tools/go/analysis"
+)
+
+var Migrations = &analysis.Analyzer{
+	Name: "migrations",
+	Doc:  "check migrations for black-listed packages.",
+	Run:  checkMigrations,
+}
+
+var (
+	migrationDepBlockList = []string{
+		"code.gitea.io/gitea/models",
+	}
+	migrationImpBlockList = []string{
+		"code.gitea.io/gitea/modules/structs",
+	}
+)
+
+func checkMigrations(pass *analysis.Pass) (interface{}, error) {
+	if !strings.EqualFold(pass.Pkg.Path(), "code.gitea.io/gitea/models/migrations") {
+		return nil, nil
+	}
+
+	if _, err := exec.LookPath("go"); err != nil {
+		return nil, errors.New("go was not found in the PATH")
+	}
+
+	depsCmd := exec.Command("go", "list", "-f", `{{join .Deps "\n"}}`, "code.gitea.io/gitea/models/migrations")
+	depsOut, err := depsCmd.Output()
+	if err != nil {
+		return nil, err
+	}
+
+	deps := strings.Split(string(depsOut), "\n")
+	for _, dep := range deps {
+		if stringInSlice(dep, migrationDepBlockList) {
+			pass.Reportf(0, "code.gitea.io/gitea/models/migrations cannot depend on the following packages: %s", migrationDepBlockList)
+			return nil, nil
+		}
+	}
+
+	impsCmd := exec.Command("go", "list", "-f", `{{join .Imports "\n"}}`, "code.gitea.io/gitea/models/migrations")
+	impsOut, err := impsCmd.Output()
+	if err != nil {
+		return nil, err
+	}
+
+	imps := strings.Split(string(impsOut), "\n")
+	for _, imp := range imps {
+		if stringInSlice(imp, migrationImpBlockList) {
+			pass.Reportf(0, "code.gitea.io/gitea/models/migrations cannot import the following packages: %s", migrationImpBlockList)
+			return nil, nil
+		}
+	}
+
+	return nil, nil
+}
+
+func stringInSlice(needle string, haystack []string) bool {
+	for _, h := range haystack {
+		if strings.EqualFold(needle, h) {
+			return true
+		}
+	}
+	return false
+}