// ReadAt returns a reader for a file at the path relative to the alloc dir
func (d *AllocDir) ReadAt(path string, offset int64) (io.ReadCloser, error) {
if escapes, err := structs.PathEscapesAllocDir(path); err != nil {
return nil, fmt.Errorf("Failed to check if path escapes alloc directory: %v", err)
} else if escapes {
return nil, fmt.Errorf("Path escapes the alloc directory")
}
p := filepath.Join(d.AllocDir, path)
// Check if it is trying to read into a secret directory
for _, dir := range d.TaskDirs {
sdir := filepath.Join(dir, TaskSecrets)
if filepath.HasPrefix(p, sdir) {
return nil, fmt.Errorf("Reading secret file prohibited: %s", path)
}
}
f, err := os.Open(p)
if err != nil {
return nil, err
}
if _, err := f.Seek(offset, 0); err != nil {
return nil, fmt.Errorf("can't seek to offset %q: %v", offset, err)
}
return f, nil
}
// ChangeEvents watches for changes to the passed path relative to the
// allocation directory. The offset should be the last read offset. The tomb is
// used to clean up the watch.
func (d *AllocDir) ChangeEvents(path string, curOffset int64, t *tomb.Tomb) (*watch.FileChanges, error) {
if escapes, err := structs.PathEscapesAllocDir(path); err != nil {
return nil, fmt.Errorf("Failed to check if path escapes alloc directory: %v", err)
} else if escapes {
return nil, fmt.Errorf("Path escapes the alloc directory")
}
// Get the path relative to the alloc directory
p := filepath.Join(d.AllocDir, path)
watcher := getFileWatcher(p)
return watcher.ChangeEvents(t, curOffset)
}
// BlockUntilExists blocks until the passed file relative the allocation
// directory exists. The block can be cancelled with the passed tomb.
func (d *AllocDir) BlockUntilExists(path string, t *tomb.Tomb) (chan error, error) {
if escapes, err := structs.PathEscapesAllocDir(path); err != nil {
return nil, fmt.Errorf("Failed to check if path escapes alloc directory: %v", err)
} else if escapes {
return nil, fmt.Errorf("Path escapes the alloc directory")
}
// Get the path relative to the alloc directory
p := filepath.Join(d.AllocDir, path)
watcher := getFileWatcher(p)
returnCh := make(chan error, 1)
go func() {
returnCh <- watcher.BlockUntilExists(t)
close(returnCh)
}()
return returnCh, nil
}
// ReadAt returns a reader for a file at the path relative to the alloc dir
func (d *AllocDir) ReadAt(path string, offset int64) (io.ReadCloser, error) {
if escapes, err := structs.PathEscapesAllocDir(path); err != nil {
return nil, fmt.Errorf("Failed to check if path escapes alloc directory: %v", err)
} else if escapes {
return nil, fmt.Errorf("Path escapes the alloc directory")
}
p := filepath.Join(d.AllocDir, path)
f, err := os.Open(p)
if err != nil {
return nil, err
}
if _, err := f.Seek(offset, 0); err != nil {
return nil, fmt.Errorf("can't seek to offset %q: %v", offset, err)
}
return f, nil
}
// Stat returns information about the file at a path relative to the alloc dir
func (d *AllocDir) Stat(path string) (*AllocFileInfo, error) {
if escapes, err := structs.PathEscapesAllocDir(path); err != nil {
return nil, fmt.Errorf("Failed to check if path escapes alloc directory: %v", err)
} else if escapes {
return nil, fmt.Errorf("Path escapes the alloc directory")
}
p := filepath.Join(d.AllocDir, path)
info, err := os.Stat(p)
if err != nil {
return nil, err
}
return &AllocFileInfo{
Size: info.Size(),
Name: info.Name(),
IsDir: info.IsDir(),
FileMode: info.Mode().String(),
ModTime: info.ModTime(),
}, nil
}
// List returns the list of files at a path relative to the alloc dir
func (d *AllocDir) List(path string) ([]*AllocFileInfo, error) {
if escapes, err := structs.PathEscapesAllocDir(path); err != nil {
return nil, fmt.Errorf("Failed to check if path escapes alloc directory: %v", err)
} else if escapes {
return nil, fmt.Errorf("Path escapes the alloc directory")
}
p := filepath.Join(d.AllocDir, path)
finfos, err := ioutil.ReadDir(p)
if err != nil {
return []*AllocFileInfo{}, err
}
files := make([]*AllocFileInfo, len(finfos))
for idx, info := range finfos {
files[idx] = &AllocFileInfo{
Name: info.Name(),
IsDir: info.IsDir(),
Size: info.Size(),
FileMode: info.Mode().String(),
ModTime: info.ModTime(),
}
}
return files, err
}