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file.go
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file.go
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// Copyright 2016 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 file
import (
"os"
"github.com/coreos/ignition/v2/config/v3_5_experimental/types"
"github.com/coreos/ignition/v2/internal/platform"
"github.com/coreos/ignition/v2/internal/providers/util"
"github.com/coreos/ignition/v2/internal/resource"
"github.com/coreos/vcontext/report"
)
const (
cfgFilenameEnvVar = "IGNITION_CONFIG_FILE"
defaultFilename = "config.ign"
)
func init() {
platform.Register(platform.Provider{
Name: "file",
Fetch: fetchConfig,
})
}
func fetchConfig(f *resource.Fetcher) (types.Config, report.Report, error) {
filename := os.Getenv(cfgFilenameEnvVar)
if filename == "" {
filename = defaultFilename
f.Logger.Info("using default filename")
}
f.Logger.Info("using config file at %q", filename)
rawConfig, err := os.ReadFile(filename)
if err != nil {
f.Logger.Err("couldn't read config %q: %v", filename, err)
return types.Config{}, report.Report{}, err
}
return util.ParseConfig(f.Logger, rawConfig)
}