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chartaccess.go
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chartaccess.go
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package helm
import (
"fmt"
"io"
"os"
"sync"
"github.com/mandelsoft/vfs/pkg/vfs"
"helm.sh/helm/v3/pkg/registry"
"github.com/open-component-model/ocm/pkg/blobaccess"
"github.com/open-component-model/ocm/pkg/contexts/oci/artdesc"
"github.com/open-component-model/ocm/pkg/refmgmt"
"github.com/open-component-model/ocm/pkg/utils"
)
const (
ChartMediaType = registry.ChartLayerMediaType
ProvenanceMediaType = registry.ProvLayerMediaType
)
type ChartAccess interface {
io.Closer
Chart() (blobaccess.BlobAccess, error)
Prov() (blobaccess.BlobAccess, error)
ArtefactSet() (blobaccess.BlobAccess, error)
}
func newFileAccess(c *chartAccess, path string, mime string) blobaccess.BlobAccess {
c.refcnt++
return blobaccess.ForFileWithCloser(refmgmt.CloserFunc(c.unref), mime, path, c.fs)
}
type chartAccess struct {
lock sync.Mutex
closed bool
refcnt int
fs vfs.FileSystem
root string
chart string
prov string
aset string
}
var _ ChartAccess = (*chartAccess)(nil)
func newTempChartAccess(fss ...vfs.FileSystem) (*chartAccess, error) {
fs := utils.FileSystem(fss...)
temp, err := vfs.TempDir(fs, "", "helmchart")
if err != nil {
return nil, err
}
return &chartAccess{
fs: fs,
root: temp,
}, nil
}
func NewChartAccessByFiles(chart, prov string, fss ...vfs.FileSystem) ChartAccess {
return &chartAccess{
fs: utils.FileSystem(fss...),
chart: chart,
prov: prov,
}
}
func (c *chartAccess) unref() error {
c.lock.Lock()
defer c.lock.Unlock()
if c.refcnt == 0 {
return fmt.Errorf("oops: refcount is already zero")
}
c.refcnt--
if c.refcnt == 0 && c.closed {
return c.cleanup()
}
return nil
}
func (c *chartAccess) Close() error {
c.lock.Lock()
defer c.lock.Unlock()
defer func() { c.closed = true }()
if c.refcnt == 0 {
return c.cleanup()
}
return nil
}
func (c *chartAccess) cleanup() error {
if c.root != "" {
err := os.RemoveAll(c.root)
c.root = ""
return err
}
return nil
}
func (c *chartAccess) Chart() (blobaccess.BlobAccess, error) {
c.lock.Lock()
defer c.lock.Unlock()
if c.closed {
return nil, blobaccess.ErrClosed
}
return newFileAccess(c, c.chart, ChartMediaType), nil
}
func (c *chartAccess) Prov() (blobaccess.BlobAccess, error) {
c.lock.Lock()
defer c.lock.Unlock()
if c.closed {
return nil, blobaccess.ErrClosed
}
if c.prov == "" {
return nil, nil
}
return newFileAccess(c, c.prov, ProvenanceMediaType), nil
}
func (c *chartAccess) ArtefactSet() (blobaccess.BlobAccess, error) {
c.lock.Lock()
defer c.lock.Unlock()
if c.closed {
return nil, blobaccess.ErrClosed
}
if c.aset == "" {
return nil, nil
}
return newFileAccess(c, c.aset, artdesc.MediaTypeImageManifest), nil
}