[SEMVER] store SemVer in ForgejoSemVer after a database upgrade

(cherry picked from commit b7fe7cf401)
(cherry picked from commit cf339eed4f)
(cherry picked from commit 4f3a16168b)
(cherry picked from commit 6f5bbc53fc)
(cherry picked from commit aca42b422e)
(cherry picked from commit 5a7f7580e5)
(cherry picked from commit 06c383c807)
(cherry picked from commit fe831dcb53)
(cherry picked from commit cd12cd0dbc)
(cherry picked from commit cc79163703)
(cherry picked from commit 0102a5715e)
(cherry picked from commit 403f7520b3)
(cherry picked from commit a3b61510a2)
(cherry picked from commit f83f0f9feb)
(cherry picked from commit fd1c3a6d09)
(cherry picked from commit f7cdc3d6f1)
(cherry picked from commit 060121b644)
(cherry picked from commit 62c847ff02)

models/forgejo/semver/semver.go

@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: MIT
+
+package semver
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/models/db"
+
+	"github.com/hashicorp/go-version"
+)
+
+func init() {
+	db.RegisterModel(new(ForgejoSemVer))
+}
+
+type ForgejoSemVer struct {
+	Version string
+}
+
+func GetVersion(ctx context.Context) (*version.Version, error) {
+	return GetVersionWithEngine(db.GetEngine(ctx))
+}
+
+func GetVersionWithEngine(e db.Engine) (*version.Version, error) {
+	versionString := "v1.0.0"
+	exists, err := e.IsTableExist("forgejo_sem_ver")
+	if err != nil {
+		return nil, err
+	}
+	if exists {
+		var semver ForgejoSemVer
+		has, err := e.Get(&semver)
+		if err != nil {
+			return nil, err
+		} else if has {
+			versionString = semver.Version
+		}
+	}
+
+	v, err := version.NewVersion(versionString)
+	if err != nil {
+		return nil, err
+	}
+	return v, nil
+}
+
+func SetVersionString(ctx context.Context, versionString string) error {
+	return SetVersionStringWithEngine(db.GetEngine(ctx), versionString)
+}
+
+func SetVersionStringWithEngine(e db.Engine, versionString string) error {
+	v, err := version.NewVersion(versionString)
+	if err != nil {
+		return err
+	}
+	return SetVersionWithEngine(e, v)
+}
+
+func SetVersion(ctx context.Context, v *version.Version) error {
+	return SetVersionWithEngine(db.GetEngine(ctx), v)
+}
+
+func SetVersionWithEngine(e db.Engine, v *version.Version) error {
+	var semver ForgejoSemVer
+	has, err := e.Get(&semver)
+	if err != nil {
+		return err
+	}
+
+	if !has {
+		_, err = e.Exec("insert into forgejo_sem_ver values (?)", v.String())
+	} else {
+		_, err = e.Exec("update forgejo_sem_ver set version = ?", v.String())
+	}
+	return err
+}