9p file sharing #4866
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| package fs9p | ||
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| import ( | ||
| "fmt" | ||
| "net" | ||
| "os" | ||
| "path/filepath" | ||
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| "github.com/DeedleFake/p9" | ||
| "github.com/DeedleFake/p9/proto" | ||
| "github.com/crc-org/crc/v2/pkg/crc/constants" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
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| type Server struct { | ||
| // Listener this server is bound to | ||
| Listener net.Listener | ||
| // Plan9 Filesystem type that holds the exposed directory | ||
| Filesystem p9.FileSystem | ||
| // Directory this server exposes | ||
| ExposedDir string | ||
| // Errors from the server being started will come out here | ||
| ErrChan chan error | ||
| } | ||
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| // New9pServer exposes a single directory (and all children) via the given net.Listener | ||
| // and returns the server struct. | ||
| // Directory given must be an absolute path and must exist. | ||
| func New9pServer(listener net.Listener, exposeDir string) (*Server, error) { | ||
| // Verify that exposeDir makes sense. | ||
| if !filepath.IsAbs(exposeDir) { | ||
| return nil, fmt.Errorf("path to expose to machine must be absolute: %s", exposeDir) | ||
| } | ||
| stat, err := os.Stat(exposeDir) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("cannot stat path to expose to machine: %w", err) | ||
| } | ||
| if !stat.IsDir() { | ||
| return nil, fmt.Errorf("path to expose to machine must be a directory: %s", exposeDir) | ||
| } | ||
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| fs := p9.FileSystem(p9.Dir(exposeDir)) | ||
| // set size to 1 making channel buffered to prevent proto.Serve blocking | ||
| errChan := make(chan error, 1) | ||
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| toReturn := new(Server) | ||
| toReturn.Listener = listener | ||
| toReturn.Filesystem = fs | ||
| toReturn.ExposedDir = exposeDir | ||
| toReturn.ErrChan = errChan | ||
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| return toReturn, nil | ||
| } | ||
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| // Start a server created by New9pServer. | ||
| func (s *Server) Start() error { | ||
| go func() { | ||
| s.ErrChan <- proto.Serve(s.Listener, p9.Proto(), p9.FSConnHandler(s.Filesystem, constants.Plan9Msize)) | ||
| close(s.ErrChan) | ||
| }() | ||
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| // Just before returning, check to see if we got an error off server startup. | ||
| select { | ||
| case err := <-s.ErrChan: | ||
| return fmt.Errorf("starting 9p server: %w", err) | ||
| default: | ||
| logrus.Infof("Successfully started 9p server on %s for directory %s", s.Listener.Addr().String(), s.ExposedDir) | ||
| return nil | ||
| } | ||
| } | ||
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| // Stop a running server. | ||
| // Please note that this does *BAD THINGS* to clients if they are still running | ||
| // when the server stops. Processes get stuck in I/O deep sleep and zombify, and | ||
| // nothing I do other than restarting the VM can remove the zombies. | ||
| func (s *Server) Stop() error { | ||
| if err := s.Listener.Close(); err != nil { | ||
| return err | ||
| } | ||
| logrus.Infof("Successfully stopped 9p server for directory %s", s.ExposedDir) | ||
| return nil | ||
| } | ||
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| // WaitForError from a running server. | ||
| func (s *Server) WaitForError() error { | ||
| err := <-s.ErrChan | ||
| return err | ||
| } | ||
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