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Add GetContainerRoot to oci.State type

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This change adds a GetContainerRoot to the oci.State type to
encapsulate the logic around determining the container root.
This Fixes a bug where relative roots (e.g. as generated by contianerd)
are not supported.

Signed-off-by: Evan Lezar <elezar@nvidia.com>
This commit is contained in:
Evan Lezar 2022-05-10 09:55:08 +02:00
parent 117f68fa6e
commit 395f6cecb2
1 changed files with 22 additions and 2 deletions
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24
internal/oci/state.go
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@ -21,6 +21,7 @@ import (
"fmt" "fmt"
"io" "io"
"os" "os"
"path/filepath"
"github.com/opencontainers/runtime-spec/specs-go" "github.com/opencontainers/runtime-spec/specs-go"
) )
@ -56,7 +57,7 @@ func ReadContainerState(reader io.Reader) (*State, error) {
} }
// LoadSpec loads the OCI spec associated with the container state // LoadSpec loads the OCI spec associated with the container state
func (s State) LoadSpec() (*specs.Spec, error) { func (s *State) LoadSpec() (*specs.Spec, error) {
specFilePath := GetSpecFilePath(s.Bundle) specFilePath := GetSpecFilePath(s.Bundle)
specFile, err := os.Open(specFilePath) specFile, err := os.Open(specFilePath)
if err != nil { if err != nil {
@ -68,6 +69,25 @@ func (s State) LoadSpec() (*specs.Spec, error) {
if err != nil { if err != nil {
return nil, fmt.Errorf("failed to load OCI spec: %v", err) return nil, fmt.Errorf("failed to load OCI spec: %v", err)
} }
return spec, nil return spec, nil
} }
// GetContainerRoot returns the root for the container from the associated spec. If the spec is not yet loaded, it is
// loaded and cached.
func (s *State) GetContainerRoot() (string, error) {
spec, err := s.LoadSpec()
if err != nil {
return "", err
}
var containerRoot string
if spec.Root != nil {
containerRoot = spec.Root.Path
}
if filepath.IsAbs(containerRoot) {
return containerRoot, nil
}
return filepath.Join(s.Bundle, containerRoot), nil
}