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