forked from microsoft/hcsshim
/
spec.go
42 lines (37 loc) · 896 Bytes
/
spec.go
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package main
import (
"encoding/json"
"fmt"
"os"
"github.com/opencontainers/runtime-spec/specs-go"
"github.com/urfave/cli"
)
// loadSpec loads the specification from the provided path.
func loadSpec(cPath string) (spec *specs.Spec, err error) {
cf, err := os.Open(cPath)
if err != nil {
if os.IsNotExist(err) {
return nil, fmt.Errorf("JSON specification file %s not found", cPath)
}
return nil, err
}
defer cf.Close()
if err = json.NewDecoder(cf).Decode(&spec); err != nil {
return nil, err
}
return spec, nil
}
// setupSpec performs initial setup based on the cli.Context for the container
func setupSpec(context *cli.Context) (*specs.Spec, error) {
bundle := context.String("bundle")
if bundle != "" {
if err := os.Chdir(bundle); err != nil {
return nil, err
}
}
spec, err := loadSpec(specConfig)
if err != nil {
return nil, err
}
return spec, nil
}