Nick RossiandGitHub
b91e844014
Simplifies cmd/containerboot env var parsing. Most of the private helpers did not earn their abstraction: defaultEnv(name, "") is just os.Getenv(name), and the rest collapse into cmp.Or and the existing def.Bool. defaultEnv, defaultEnvs and defaultBool are gone. Adds def.LookupEnv, the env companion to def.Bool, for the one case that needs it: TS_KUBE_SECRET, where an explicit "" disables Kubernetes secret storage and must stay distinct from unset (cmp.Or cannot express that). Updates #20018 Signed-off-by: Nick Rossi <nrossi0530@gmail.com>
46 lines
998 B
Go
46 lines
998 B
Go
// Copyright (c) Tailscale Inc & contributors
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// SPDX-License-Identifier: BSD-3-Clause
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// Package def parses strings and environment variables with fallback default values.
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package def
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import (
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"os"
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"strconv"
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"time"
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)
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// Bool parses s as a bool, returning def when s is empty or invalid.
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func Bool(s string, def bool) bool {
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if s == "" {
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return def
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}
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v, err := strconv.ParseBool(s)
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if err != nil {
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return def
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}
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return v
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}
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// Duration parses s as a time.Duration, returning def when s is empty or invalid.
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func Duration(s string, def time.Duration) time.Duration {
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if s == "" {
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return def
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}
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v, err := time.ParseDuration(s)
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if err != nil {
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return def
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}
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return v
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}
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// LookupEnv retrieves the value of the environment variable named by the key.
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// If the variable is present in the environment the value (which may be
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// empty) is returned. Otherwise, it returns def.
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func LookupEnv(key, def string) string {
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if v, ok := os.LookupEnv(key); ok {
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return v
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}
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return def
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}
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