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package cli |
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|
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import ( |
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"context" |
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"fmt" |
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"net/url" |
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"os" |
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"os/signal" |
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"path/filepath" |
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"strings" |
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"syscall" |
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|
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"github.com/spf13/cobra" |
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|
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"github.com/lain/larc/internal/mount" |
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"github.com/lain/larc/internal/protocol" |
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) |
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|
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/* Mount commands: mount, unmount |
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* Mount a remote repository as a read-only FUSE filesystem. */ |
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|
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// MountCmd creates the mount command |
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func MountCmd() *cobra.Command { |
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cmd := &cobra.Command{ |
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Use: "mount <url> <mountpoint>", |
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Short: "Mount a remote repository", |
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Long: `Mount a remote larc repository as a read-only filesystem. |
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Files are fetched lazily and cached locally in ~/.cache/larc/blobs. |
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|
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Examples: |
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larc mount https://example.com/repo /mnt/repo |
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larc mount -r 42 https://example.com/repo /mnt/repo`, |
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Args: cobra.ExactArgs(2), |
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RunE: func(cmd *cobra.Command, args []string) error { |
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repoURL := args[0] |
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mountPoint := args[1] |
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|
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revision, _ := cmd.Flags().GetInt64("revision") |
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foreground, _ := cmd.Flags().GetBool("foreground") |
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|
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return runMount(repoURL, mountPoint, revision, foreground) |
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}, |
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} |
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|
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cmd.Flags().Int64P("revision", "r", 0, "revision to mount (default: latest)") |
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cmd.Flags().BoolP("foreground", "f", false, "run in foreground") |
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|
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return cmd |
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} |
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|
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func runMount(repoURL, mountPoint string, revision int64, foreground bool) error { |
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/* parse URL */ |
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parsed, err := url.Parse(repoURL) |
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if err != nil { |
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return fmt.Errorf("invalid URL: %w", err) |
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} |
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|
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repoName := strings.TrimPrefix(parsed.Path, "/") |
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repoName = strings.TrimSuffix(repoName, "/") |
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baseURL := fmt.Sprintf("%s://%s", parsed.Scheme, parsed.Host) |
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|
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/* create client */ |
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client := protocol.NewClient(baseURL) |
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if parsed.User != nil { |
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password, _ := parsed.User.Password() |
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client.SetAuth(parsed.User.Username(), password) |
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} |
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|
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/* get repo info */ |
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info, err := client.GetInfo(repoName) |
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if err != nil { |
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return fmt.Errorf("failed to connect: %w", err) |
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} |
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|
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/* determine revision to mount */ |
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targetRev := revision |
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if targetRev == 0 { |
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targetRev = info.LatestRev |
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} |
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|
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if targetRev > info.LatestRev { |
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return fmt.Errorf("revision r%d does not exist (latest: r%d)", targetRev, info.LatestRev) |
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} |
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|
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fmt.Printf("Mounting %s at r%d to %s\n", repoName, targetRev, mountPoint) |
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|
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/* get tree for revision */ |
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tree, err := client.GetTree(repoName, targetRev) |
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if err != nil { |
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return fmt.Errorf("failed to get tree: %w", err) |
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} |
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|
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fmt.Printf(" %d files in tree\n", len(tree.Entries)) |
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|
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/* create mount point if needed */ |
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mountPoint, err = filepath.Abs(mountPoint) |
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if err != nil { |
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return err |
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} |
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|
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if err := os.MkdirAll(mountPoint, 0755); err != nil { |
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return fmt.Errorf("create mount point: %w", err) |
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} |
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|
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/* create cache */ |
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cache, err := mount.NewBlobCache() |
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if err != nil { |
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return fmt.Errorf("create cache: %w", err) |
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} |
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fmt.Printf(" cache: %s\n", cache.Dir()) |
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|
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/* create filesystem */ |
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fs := mount.NewLarcFS(client, repoName, targetRev, tree, cache) |
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|
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/* mount */ |
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mfs, err := mount.Mount(mountPoint, fs) |
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if err != nil { |
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return fmt.Errorf("mount failed: %w", err) |
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} |
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|
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fmt.Printf("Mounted successfully. Use 'larc unmount %s' to unmount.\n", mountPoint) |
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|
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/* setup signal handler */ |
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sigChan := make(chan os.Signal, 1) |
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signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM) |
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|
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if foreground { |
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fmt.Println("Press Ctrl+C to unmount...") |
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} |
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|
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/* wait for unmount or signal */ |
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done := make(chan struct{}) |
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go func() { |
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mfs.Join(context.Background()) |
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close(done) |
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}() |
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|
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select { |
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case <-sigChan: |
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fmt.Println("\nUnmounting...") |
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mount.Unmount(mountPoint) |
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<-done |
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case <-done: |
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/* filesystem was unmounted externally */ |
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} |
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|
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return nil |
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} |
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|
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// UnmountCmd creates the unmount command |
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func UnmountCmd() *cobra.Command { |
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return &cobra.Command{ |
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Use: "unmount <mountpoint>", |
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Aliases: []string{"umount"}, |
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Short: "Unmount a mounted repository", |
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Args: cobra.ExactArgs(1), |
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RunE: func(cmd *cobra.Command, args []string) error { |
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mountPoint := args[0] |
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|
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mountPoint, err := filepath.Abs(mountPoint) |
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if err != nil { |
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return err |
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} |
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|
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if err := mount.Unmount(mountPoint); err != nil { |
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return fmt.Errorf("unmount failed: %w", err) |
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} |
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|
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fmt.Printf("Unmounted %s\n", mountPoint) |
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return nil |
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}, |
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} |
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} |
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|