F3: Forgejo driver and CLI

user, topic, project, label, milestone, repository, pull_request,
release, asset, comment, reaction, review providers

Signed-off-by: Earl Warren <contact@earl-warren.org>

Preserve file size when creating attachments

Introduced in c6f5029708

repoList.LoadAttributes has a ctx argument now

Rename `repo.GetOwner` to `repo.LoadOwner`

bd66fa586a

upgrade to the latest gof3

(cherry picked from commit c770713656)

[F3] ID remapping logic is in place, remove workaround

(cherry picked from commit d0fee30167)

[F3] it is experimental, do not enable by default

(cherry picked from commit de325b21d0)
(cherry picked from commit 547e7b3c40)

cmd/f3.go

@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: MIT
+
+package cmd
+
+import (
+	"context"
+	"fmt"
+
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/services/f3/util"
+
+	"github.com/urfave/cli"
+	"lab.forgefriends.org/friendlyforgeformat/gof3"
+	f3_common "lab.forgefriends.org/friendlyforgeformat/gof3/forges/common"
+	f3_format "lab.forgefriends.org/friendlyforgeformat/gof3/format"
+)
+
+var CmdF3 = cli.Command{
+	Name:        "f3",
+	Usage:       "Friendly Forge Format (F3) format export/import.",
+	Description: "Import or export a repository from or to the Friendly Forge Format (F3) format.",
+	Action:      runF3,
+	Flags: []cli.Flag{
+		cli.StringFlag{
+			Name:  "directory",
+			Value: "./f3",
+			Usage: "Path of the directory where the F3 dump is stored",
+		},
+		cli.StringFlag{
+			Name:  "user",
+			Value: "",
+			Usage: "The name of the user who owns the repository",
+		},
+		cli.StringFlag{
+			Name:  "repository",
+			Value: "",
+			Usage: "The name of the repository",
+		},
+		cli.BoolFlag{
+			Name:  "no-pull-request",
+			Usage: "Do not dump pull requests",
+		},
+		cli.BoolFlag{
+			Name:  "import",
+			Usage: "Import from the directory",
+		},
+		cli.BoolFlag{
+			Name:  "export",
+			Usage: "Export to the directory",
+		},
+	},
+}
+
+func runF3(ctx *cli.Context) error {
+	stdCtx, cancel := installSignals()
+	defer cancel()
+
+	if err := initDB(stdCtx); err != nil {
+		return err
+	}
+
+	if err := git.InitSimple(stdCtx); err != nil {
+		return err
+	}
+
+	return RunF3(stdCtx, ctx)
+}
+
+func RunF3(stdCtx context.Context, ctx *cli.Context) error {
+	doer, err := user_model.GetAdminUser()
+	if err != nil {
+		return err
+	}
+
+	features := gof3.AllFeatures
+	if ctx.Bool("no-pull-request") {
+		features.PullRequests = false
+	}
+
+	forgejo := util.ForgejoForgeRoot(features, doer)
+	f3 := util.F3ForgeRoot(features, ctx.String("directory"))
+
+	if ctx.Bool("export") {
+		forgejo.Forge.Users.List(stdCtx)
+		user := forgejo.Forge.Users.GetFromFormat(stdCtx, &f3_format.User{UserName: ctx.String("user")})
+		if user.IsNil() {
+			return fmt.Errorf("%s is not a known user", ctx.String("user"))
+		}
+
+		user.Projects.List(stdCtx)
+		project := user.Projects.GetFromFormat(stdCtx, &f3_format.Project{Name: ctx.String("repository")})
+		if project.IsNil() {
+			return fmt.Errorf("%s/%s is not a known repository", ctx.String("user"), ctx.String("repository"))
+		}
+
+		options := f3_common.NewMirrorOptionsRecurse(user, project)
+		f3.Forge.Mirror(stdCtx, forgejo.Forge, options)
+		fmt.Println("exported")
+	} else if ctx.Bool("import") {
+		options := f3_common.NewMirrorOptionsRecurse()
+		forgejo.Forge.Mirror(stdCtx, f3.Forge, options)
+		fmt.Println("imported")
+	} else {
+		return fmt.Errorf("either --import or --export must be specified")
+	}
+
+	return nil
+}