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volume/local: store both volume's "data" and "root" path

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Instead of evaluating these paths each time (appending `_data`, or using
`filepath.Dir()` to find the root path from the `_data_` path).

This also removes the `root.DataPath()` utility, which is now no longer needed.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2022-05-17 15:48:03 +02:00
parent e106e3f5c6
commit d3930330a7
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GPG key ID: 76698F39D527CE8C
1 changed files with 24 additions and 24 deletions
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48
volume/local/local.go
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@ -74,10 +74,11 @@ func New(scope string, rootIdentity idtools.Identity) (*Root, error) {
v := &localVolume{
driverName: r.Name(),
name: name,
path: r.DataPath(name),
rootPath: filepath.Join(r.path, name),
path: filepath.Join(r.path, name, volumeDataPathName),
quotaCtl: r.quotaCtl,
}
if b, err := os.ReadFile(filepath.Join(r.path, name, "opts.json")); err == nil {
if b, err := os.ReadFile(filepath.Join(v.rootPath, "opts.json")); err == nil {
opts := optsConfig{}
if err := json.Unmarshal(b, &opts); err != nil {
return nil, errors.Wrapf(err, "error while unmarshaling volume options for volume: %s", name)
@ -119,11 +120,6 @@ func (r *Root) List() ([]volume.Volume, error) {
return ls, nil
}
// DataPath returns the constructed path of this volume.
func (r *Root) DataPath(volumeName string) string {
return filepath.Join(r.path, volumeName, volumeDataPathName)
}
// Name returns the name of Root, defined in the volume package in the DefaultDriverName constant.
func (r *Root) Name() string {
return volume.DefaultDriverName
@ -148,32 +144,31 @@ func (r *Root) Create(name string, opts map[string]string) (volume.Volume, error
return v, nil
}
path := r.DataPath(name)
volRoot := filepath.Dir(path)
v = &localVolume{
driverName: r.Name(),
name: name,
rootPath: filepath.Join(r.path, name),
path: filepath.Join(r.path, name, volumeDataPathName),
quotaCtl: r.quotaCtl,
}
// Root dir does not need to be accessed by the remapped root
if err := idtools.MkdirAllAndChown(volRoot, 0701, idtools.CurrentIdentity()); err != nil {
return nil, errors.Wrapf(errdefs.System(err), "error while creating volume root path '%s'", volRoot)
if err := idtools.MkdirAllAndChown(v.rootPath, 0701, idtools.CurrentIdentity()); err != nil {
return nil, errors.Wrapf(errdefs.System(err), "error while creating volume root path '%s'", v.rootPath)
}
// Remapped root does need access to the data path
if err := idtools.MkdirAllAndChown(path, 0755, r.rootIdentity); err != nil {
return nil, errors.Wrapf(errdefs.System(err), "error while creating volume data path '%s'", path)
if err := idtools.MkdirAllAndChown(v.path, 0755, r.rootIdentity); err != nil {
return nil, errors.Wrapf(errdefs.System(err), "error while creating volume data path '%s'", v.path)
}
var err error
defer func() {
if err != nil {
os.RemoveAll(filepath.Dir(path))
os.RemoveAll(v.rootPath)
}
}()
v = &localVolume{
driverName: r.Name(),
name: name,
path: path,
quotaCtl: r.quotaCtl,
}
if len(opts) != 0 {
if err = v.setOpts(opts); err != nil {
return nil, err
@ -183,7 +178,7 @@ func (r *Root) Create(name string, opts map[string]string) (volume.Volume, error
if err != nil {
return nil, err
}
if err = os.WriteFile(filepath.Join(filepath.Dir(path), "opts.json"), b, 0600); err != nil {
if err = os.WriteFile(filepath.Join(v.rootPath, "opts.json"), b, 0600); err != nil {
return nil, errdefs.System(errors.Wrap(err, "error while persisting volume options"))
}
}
@ -213,12 +208,15 @@ func (r *Root) Remove(v volume.Volume) error {
return err
}
// TODO(thaJeztah) is there a reason we're evaluating the data-path here, and not the volume's rootPath?
realPath, err := filepath.EvalSymlinks(lv.path)
if err != nil {
if !os.IsNotExist(err) {
return err
}
realPath = filepath.Dir(lv.path)
// if the volume's data-directory wasn't found, fall back to using the
// volume's root path (see 8d27417bfeff316346d00c07a456b0e1b056e788)
realPath = lv.rootPath
}
if realPath == r.path || !strings.HasPrefix(realPath, r.path) {
@ -230,7 +228,7 @@ func (r *Root) Remove(v volume.Volume) error {
}
delete(r.volumes, lv.name)
return removePath(filepath.Dir(lv.path))
return removePath(lv.rootPath)
}
func removePath(path string) error {
@ -275,6 +273,8 @@ type localVolume struct {
m sync.Mutex
// unique name of the volume
name string
// rootPath is the volume's root path, where the volume's metadata is stored.
rootPath string
// path is the path on the host where the data lives
path string
// driverName is the name of the driver that created the volume.