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package exec
import (
"bytes"
"context"
"encoding/json"
"time"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// RuntimeConfigFilter calls a series of hooks. But instead of
// passing container state on their standard input,
// RuntimeConfigFilter passes the proposed runtime configuration (and
// reads back a possibly-altered form from their standard output).
func RuntimeConfigFilter(ctx context.Context, hooks []spec.Hook, config *spec.Spec, postKillTimeout time.Duration) (hookErr, err error) {
data, err := json.Marshal(config)
for _, hook := range hooks {
var stdout bytes.Buffer
hookErr, err = Run(ctx, &hook, data, &stdout, nil, postKillTimeout)
if err != nil {
return hookErr, err
}
data = stdout.Bytes()
}
err = json.Unmarshal(data, config)
if err != nil {
logrus.Debugf("invalid JSON from config-filter hooks:\n%s", string(data))
return nil, errors.Wrap(err, "unmarshal output from config-filter hooks")
}
return nil, nil
}
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