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75 lines
2.1 KiB
Go
75 lines
2.1 KiB
Go
/*
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Copyright 2024 The Flux authors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package main
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import (
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"bufio"
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"fmt"
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"github.com/fluxcd/pkg/envsubst"
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"github.com/spf13/cobra"
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)
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var envsubstCmd = &cobra.Command{
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Use: "envsubst",
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Args: cobra.NoArgs,
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Short: "envsubst substitutes the values of environment variables",
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Long: withPreviewNote(`The envsubst command substitutes the values of environment variables
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in the string piped as standard input and writes the result to the standard output. This command can be used
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to replicate the behavior of the Flux Kustomization post-build substitutions.`),
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Example: ` # Run env var substitutions on the kustomization build output
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export cluster_region=eu-central-1
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kustomize build . | flux envsubst
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# Run env var substitutions and error out if a variable is not set
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kustomize build . | flux envsubst --strict
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`,
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RunE: runEnvsubstCmd,
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}
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type envsubstFlags struct {
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strict bool
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}
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var envsubstArgs envsubstFlags
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func init() {
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envsubstCmd.Flags().BoolVar(&envsubstArgs.strict, "strict", false,
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"fail if a variable without a default value is declared in the input but is missing from the environment")
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rootCmd.AddCommand(envsubstCmd)
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}
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func runEnvsubstCmd(cmd *cobra.Command, args []string) error {
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stdin := bufio.NewScanner(rootCmd.InOrStdin())
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stdout := bufio.NewWriter(rootCmd.OutOrStdout())
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for stdin.Scan() {
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line, err := envsubst.EvalEnv(stdin.Text(), envsubstArgs.strict)
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if err != nil {
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return err
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}
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_, err = fmt.Fprintln(stdout, line)
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if err != nil {
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return err
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}
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err = stdout.Flush()
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if err != nil {
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return err
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}
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}
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return nil
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}
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