mirror of
https://github.com/ko-build/ko.git
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c3a657a04b
This allows viper configuration to be set using environment variables instead of just with a config file.
112 lines
3.0 KiB
Go
112 lines
3.0 KiB
Go
// Copyright 2018 Google LLC All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package commands
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import (
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"context"
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"fmt"
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"log"
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"os"
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"os/signal"
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"strconv"
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"syscall"
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"time"
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"github.com/google/go-containerregistry/pkg/authn"
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"github.com/google/go-containerregistry/pkg/name"
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v1 "github.com/google/go-containerregistry/pkg/v1"
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"github.com/google/go-containerregistry/pkg/v1/remote"
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"github.com/spf13/viper"
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)
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var (
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defaultBaseImage name.Reference
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baseImageOverrides map[string]name.Reference
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)
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func getBaseImage(s string) (v1.Image, error) {
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ref, ok := baseImageOverrides[s]
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if !ok {
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ref = defaultBaseImage
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}
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log.Printf("Using base %s for %s", ref, s)
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return remote.Image(ref,
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remote.WithTransport(defaultTransport()),
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remote.WithAuthFromKeychain(authn.DefaultKeychain))
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}
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func getCreationTime() (*v1.Time, error) {
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epoch := os.Getenv("SOURCE_DATE_EPOCH")
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if epoch == "" {
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return nil, nil
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}
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seconds, err := strconv.ParseInt(epoch, 10, 64)
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if err != nil {
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return nil, fmt.Errorf("the environment variable SOURCE_DATE_EPOCH should be the number of seconds since January 1st 1970, 00:00 UTC, got: %v", err)
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}
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return &v1.Time{time.Unix(seconds, 0)}, nil
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}
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func createCancellableContext() context.Context {
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signals := make(chan os.Signal)
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signal.Notify(signals, syscall.SIGINT, syscall.SIGTERM)
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ctx, cancel := context.WithCancel(context.Background())
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go func() {
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<-signals
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cancel()
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}()
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return ctx
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}
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func init() {
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// If omitted, use this base image.
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viper.SetDefault("defaultBaseImage", "gcr.io/distroless/static:latest")
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viper.SetConfigName(".ko") // .yaml is implicit
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viper.SetEnvPrefix("KO")
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viper.AutomaticEnv()
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if override := os.Getenv("KO_CONFIG_PATH"); override != "" {
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viper.AddConfigPath(override)
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}
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viper.AddConfigPath("./")
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if err := viper.ReadInConfig(); err != nil {
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if _, ok := err.(viper.ConfigFileNotFoundError); !ok {
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log.Fatalf("error reading config file: %v", err)
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}
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}
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ref := viper.GetString("defaultBaseImage")
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dbi, err := name.ParseReference(ref)
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if err != nil {
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log.Fatalf("'defaultBaseImage': error parsing %q as image reference: %v", ref, err)
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}
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defaultBaseImage = dbi
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baseImageOverrides = make(map[string]name.Reference)
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overrides := viper.GetStringMapString("baseImageOverrides")
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for k, v := range overrides {
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bi, err := name.ParseReference(v)
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if err != nil {
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log.Fatalf("'baseImageOverrides': error parsing %q as image reference: %v", v, err)
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}
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baseImageOverrides[k] = bi
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}
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}
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