forked from rook/rook
Michael Goff
d6ccb72198
The ability to set global flags via environment variables alleviates the need to pass flags on every invokation.
75 lines
2.0 KiB
Go
75 lines
2.0 KiB
Go
/*
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Copyright 2016 The Rook Authors. All rights reserved.
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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 flags
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import (
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"fmt"
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"os"
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"strings"
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"github.com/spf13/cobra"
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"github.com/spf13/pflag"
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)
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func VerifyRequiredFlags(cmd *cobra.Command, requiredFlags []string) error {
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var missingFlags []string
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for _, reqFlag := range requiredFlags {
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val, err := cmd.Flags().GetString(reqFlag)
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if err != nil || val == "" {
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missingFlags = append(missingFlags, reqFlag)
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}
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}
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return createRequiredFlagError(cmd.Name(), missingFlags)
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}
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func VerifyRequiredUint64Flags(cmd *cobra.Command, requiredFlags []string) error {
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var missingFlags []string
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for _, reqFlag := range requiredFlags {
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val, err := cmd.Flags().GetUint64(reqFlag)
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if err != nil || val == 0 {
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missingFlags = append(missingFlags, reqFlag)
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}
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}
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return createRequiredFlagError(cmd.Name(), missingFlags)
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}
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func createRequiredFlagError(name string, flags []string) error {
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if len(flags) == 0 {
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return nil
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}
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if len(flags) == 1 {
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return fmt.Errorf("%s is required for %s", flags[0], name)
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}
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return fmt.Errorf("%s are required for %s", strings.Join(flags, ","), name)
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}
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func SetFlagsFromEnv(flags *pflag.FlagSet, prefix string) error {
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flags.VisitAll(func(f *pflag.Flag) {
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envVar := prefix + "_" + strings.Replace(strings.ToUpper(f.Name), "-", "_", -1)
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value := os.Getenv(envVar)
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if value != "" {
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// Set the environment variable. Will override default values, but be overridden by command line parameters.
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flags.Set(f.Name, value)
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}
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})
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return nil
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}
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