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package graphdriver
import (
"github.com/sirupsen/logrus"
"github.com/containers/storage/pkg/idtools"
)
// TemplateDriver is just barely enough of a driver that we can implement a
// naive version of CreateFromTemplate on top of it.
type TemplateDriver interface {
DiffDriver
CreateReadWrite(id, parent string, opts *CreateOpts) error
Create(id, parent string, opts *CreateOpts) error
Remove(id string) error
}
// CreateFromTemplate creates a layer with the same contents and parent as
// another layer. Internally, it may even depend on that other layer
// continuing to exist, as if it were actually a child of the child layer.
func NaiveCreateFromTemplate(d TemplateDriver, id, template string, templateIDMappings *idtools.IDMappings, parent string, parentIDMappings *idtools.IDMappings, opts *CreateOpts, readWrite bool) error {
var err error
if readWrite {
err = d.CreateReadWrite(id, parent, opts)
} else {
err = d.Create(id, parent, opts)
}
if err != nil {
return err
}
diff, err := d.Diff(template, templateIDMappings, parent, parentIDMappings, opts.MountLabel)
if err != nil {
if err2 := d.Remove(id); err2 != nil {
logrus.Errorf("error removing layer %q: %v", id, err2)
}
return err
}
applyOptions := ApplyDiffOpts{
Diff: diff,
Mappings: templateIDMappings,
MountLabel: opts.MountLabel,
IgnoreChownErrors: opts.ignoreChownErrors,
}
if _, err = d.ApplyDiff(id, parent, applyOptions); err != nil {
if err2 := d.Remove(id); err2 != nil {
logrus.Errorf("error removing layer %q: %v", id, err2)
}
return err
}
return nil
}
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