fs_cgo.go

//go:build cgofuse && !windows && !openbsd

package main

import (
	"context"
	"fmt"
	"os"
	"os/signal"
	"syscall"
	"time"

	"fiatjaf.com/nostr"
	"fiatjaf.com/nostr/keyer"
	"github.com/fatih/color"
	nostrfs "github.com/fiatjaf/nak/nostrfs_cgo"
	"github.com/urfave/cli/v3"
	"github.com/winfsp/cgofuse/fuse"
)

var fsCmd = &cli.Command{
	Name:        "fs",
	Usage:       "mount a FUSE filesystem that exposes Nostr events as files.",
	Description: `(experimental)`,
	ArgsUsage:   "<mountpoint>",
	Flags: append(defaultKeyFlags,
		&PubKeyFlag{
			Name:  "pubkey",
			Usage: "public key from where to to prepopulate directories",
		},
		&cli.DurationFlag{
			Name:  "auto-publish-notes",
			Usage: "delay after which new notes will be auto-published, set to -1 to not publish.",
			Value: time.Second * 30,
		},
		&cli.DurationFlag{
			Name:        "auto-publish-articles",
			Usage:       "delay after which edited articles will be auto-published.",
			Value:       time.Hour * 24 * 365 * 2,
			DefaultText: "basically infinite",
		},
	),
	DisableSliceFlagSeparator: true,
	Action: func(ctx context.Context, c *cli.Command) error {
		mountpoint := c.Args().First()
		if mountpoint == "" {
			return fmt.Errorf("must be called with a directory path to serve as the mountpoint as an argument")
		}

		var kr nostr.User
		if signer, _, err := gatherKeyerFromArguments(ctx, c); err == nil {
			kr = signer
		} else {
			kr = keyer.NewReadOnlyUser(getPubKey(c, "pubkey"))
		}

		apnt := c.Duration("auto-publish-notes")
		if apnt < 0 {
			apnt = time.Hour * 24 * 365 * 3
		}
		apat := c.Duration("auto-publish-articles")
		if apat < 0 {
			apat = time.Hour * 24 * 365 * 3
		}

		root := nostrfs.NewNostrRoot(
			context.WithValue(
				context.WithValue(
					ctx,
					"log", log,
				),
				"logverbose", logverbose,
			),
			sys,
			kr,
			mountpoint,
			nostrfs.Options{
				AutoPublishNotesTimeout:    apnt,
				AutoPublishArticlesTimeout: apat,
			},
		)

		// create the server
		log("- mounting at %s... ", color.HiCyanString(mountpoint))

		// create cgofuse host
		host := fuse.NewFileSystemHost(root)
		host.SetCapReaddirPlus(true)
		host.SetUseIno(true)

		// mount the filesystem
		mountArgs := []string{"-s", mountpoint}
		if isVerbose {
			mountArgs = append([]string{"-d"}, mountArgs...)
		}

		go func() {
			host.Mount("", mountArgs)
		}()

		log("ok.\n")

		// setup signal handling for clean unmount
		ch := make(chan os.Signal, 1)
		chErr := make(chan error)
		signal.Notify(ch, syscall.SIGINT, syscall.SIGTERM)
		go func() {
			<-ch
			log("- unmounting... ")
			// cgofuse doesn't have explicit unmount, it unmounts on process exit
			log("ok\n")
			chErr <- nil
		}()

		// wait for signals
		return <-chErr
	},
}