mirror of
https://github.com/etcd-io/etcd.git
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8ea6be38ba
These legacy flags support are here only because we do not want CoreOS updates to break people. Now people will be aware of that they switch to etcd3. Do not need to support 0.x flags any more.
79 lines
2.0 KiB
Go
79 lines
2.0 KiB
Go
// Copyright 2015 The etcd Authors
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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 flags
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import (
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"flag"
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"os"
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"testing"
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)
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func TestSetFlagsFromEnv(t *testing.T) {
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fs := flag.NewFlagSet("testing", flag.ExitOnError)
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fs.String("a", "", "")
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fs.String("b", "", "")
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fs.String("c", "", "")
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fs.Parse([]string{})
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os.Clearenv()
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// flags should be settable using env vars
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os.Setenv("ETCD_A", "foo")
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// and command-line flags
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if err := fs.Set("b", "bar"); err != nil {
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t.Fatal(err)
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}
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// command-line flags take precedence over env vars
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os.Setenv("ETCD_C", "woof")
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if err := fs.Set("c", "quack"); err != nil {
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t.Fatal(err)
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}
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// first verify that flags are as expected before reading the env
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for f, want := range map[string]string{
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"a": "",
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"b": "bar",
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"c": "quack",
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} {
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if got := fs.Lookup(f).Value.String(); got != want {
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t.Fatalf("flag %q=%q, want %q", f, got, want)
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}
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}
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// now read the env and verify flags were updated as expected
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err := SetFlagsFromEnv("ETCD", fs)
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if err != nil {
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t.Errorf("err=%v, want nil", err)
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}
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for f, want := range map[string]string{
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"a": "foo",
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"b": "bar",
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"c": "quack",
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} {
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if got := fs.Lookup(f).Value.String(); got != want {
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t.Errorf("flag %q=%q, want %q", f, got, want)
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}
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}
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}
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func TestSetFlagsFromEnvBad(t *testing.T) {
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// now verify that an error is propagated
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fs := flag.NewFlagSet("testing", flag.ExitOnError)
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fs.Int("x", 0, "")
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os.Setenv("ETCD_X", "not_a_number")
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if err := SetFlagsFromEnv("ETCD", fs); err == nil {
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t.Errorf("err=nil, want != nil")
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}
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}
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