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system.go
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system.go
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// Copyright 2017 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package system
import (
"io/ioutil"
"os"
"path/filepath"
"github.com/coreos/ignition/config/validate/report"
"github.com/coreos/ignition/internal/config/types"
"github.com/coreos/ignition/internal/distro"
"github.com/coreos/ignition/internal/log"
"github.com/coreos/ignition/internal/providers"
"github.com/coreos/ignition/internal/providers/util"
"github.com/coreos/ignition/internal/resource"
)
const (
baseFilename = "base.ign"
defaultFilename = "default.ign"
userFilename = "user.ign"
)
func FetchBaseConfig(logger *log.Logger) (types.Config, report.Report, error) {
return fetchConfig(logger, baseFilename)
}
func FetchDefaultConfig(logger *log.Logger) (types.Config, report.Report, error) {
return fetchConfig(logger, defaultFilename)
}
func FetchConfig(f resource.Fetcher) (types.Config, report.Report, error) {
return fetchConfig(f.Logger, userFilename)
}
func fetchConfig(logger *log.Logger, filename string) (types.Config, report.Report, error) {
path := filepath.Join(distro.SystemConfigDir(), filename)
logger.Info("reading system config file %q", path)
rawConfig, err := ioutil.ReadFile(path)
if os.IsNotExist(err) {
logger.Info("no config at %q", path)
return types.Config{}, report.Report{}, providers.ErrNoProvider
} else if err != nil {
logger.Err("couldn't read config %q: %v", path, err)
return types.Config{}, report.Report{}, err
}
return util.ParseConfig(logger, rawConfig)
}