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[confmap] Fix double-expansion of escaped environment variables
This change fixes the issue where environment variables escaped with $$ were double-expanded. The collector now converts `$${ENV_VAR}` to `${ENV_VAR}` and `$$ENV_VAR` to `$ENV_VAR` without further expansion.
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7 files changed

+143
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‎.chloggen/fix-env-var-double-escaping.yaml

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# Use this changelog template to create an entry for release notes.
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# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
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change_type: bug_fix
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# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
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component: confmap
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# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
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note: Fix double-expansion of environment variables escaped with `$$`, e.g. `$${ENV_VAR}` and `$$ENV_VAR`.
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# One or more tracking issues or pull requests related to the change
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issues: [10713]
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# (Optional) One or more lines of additional information to render under the primary note.
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# These lines will be padded with 2 spaces and then inserted directly into the document.
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# Use pipe (|) for multiline entries.
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subtext: |
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This change fixes the issue where environment variables escaped with $$ were double-expanded.
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The collector now converts `$${ENV_VAR}` to `${ENV_VAR}` and `$$ENV_VAR` to `$ENV_VAR` without further expansion.
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# Optional: The change log or logs in which this entry should be included.
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# e.g. '[user]' or '[user, api]'
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# Include 'user' if the change is relevant to end users.
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# Include 'api' if there is a change to a library API.
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# Default: '[user]'
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change_logs: [api]

‎confmap/converter/expandconverter/expand.go

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@@ -85,6 +85,7 @@ func (c converter) expandEnv(s string) (string, error) {
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// - $FOO will be substituted with env var FOO
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// - $$FOO will be replaced with $FOO
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// - $$$FOO will be replaced with $ + substituted env var FOO
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// TODO: Move the escaping of $$ out from the expand converter to the resolver.
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if str == "$" {
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return "$"
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}

‎confmap/expand_test.go

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@@ -583,21 +583,21 @@ func Test_EscapedEnvVars(t *testing.T) {
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expectedMap := map[string]any{
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"test_map": map[string]any{
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"recv.1": "$MAP_VALUE_1",
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"recv.2": "$$MAP_VALUE_2",
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"recv.3": "$$MAP_VALUE_3",
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"recv.4": "$" + mapValue2,
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"recv.5": "some${MAP_VALUE_4}text",
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"recv.6": "${ONE}${TWO}",
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"recv.7": "text$",
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"recv.8": "$",
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"recv.9": "${1}${env:2}",
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"recv.10": "some${env:MAP_VALUE_4}text",
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"recv.11": "${env:" + mapValue2 + "}",
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"recv.12": "${env:${MAP_VALUE_2}}",
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"recv.13": "env:MAP_VALUE_2}${MAP_VALUE_2}{",
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"recv.14": "${env:MAP_VALUE_2${MAP_VALUE_2}",
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"recv.15": "$" + mapValue2,
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"recv.1": "$$MAP_VALUE_1",
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"recv.2": "$$$MAP_VALUE_2",
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"recv.3": "$$$$MAP_VALUE_3",
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"recv.4": "$$" + mapValue2,
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"recv.5": "some$${MAP_VALUE_4}text",
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"recv.6": "$${ONE}$${TWO}",
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"recv.7": "text$$",
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"recv.8": "$$",
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"recv.9": "$${1}$${env:2}",
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"recv.10": "some$${env:MAP_VALUE_4}text",
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"recv.11": "$${env:" + mapValue2 + "}",
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"recv.12": "$${env:$${MAP_VALUE_2}}",
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"recv.13": "env:MAP_VALUE_2}$${MAP_VALUE_2}{",
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"recv.14": "${env:MAP_VALUE_2$${MAP_VALUE_2}",
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"recv.15": "$$" + mapValue2,
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}}
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fileProvider := newFakeProvider("file", func(_ context.Context, uri string, _ WatcherFunc) (*Retrieved, error) {

‎confmap/internal/e2e/expand_test.go

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package e2etest
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import (
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"context"
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"go.opentelemetry.io/collector/confmap/provider/fileprovider"
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"path/filepath"
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"go.opentelemetry.io/collector/confmap"
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"go.opentelemetry.io/collector/confmap/converter/expandconverter"
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"go.opentelemetry.io/collector/confmap/provider/envprovider"
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)
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// Test_EscapedEnvVars tests that the resolver supports escaped env vars working together with expand converter.
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func Test_EscapedEnvVars(t *testing.T) {
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tests := []struct {
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name string
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scheme string
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}{
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{
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name: "no_default_scheme",
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scheme: "",
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},
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{
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name: "env",
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scheme: "env",
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},
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}
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const expandedValue = "some expanded value"
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t.Setenv("ENV_VALUE", expandedValue)
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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expectedMap := map[string]any{
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"test_map": map[string]any{
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"key1": "$ENV_VALUE",
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"key2": "$$ENV_VALUE",
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"key3": "$" + expandedValue,
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"key4": "some${ENV_VALUE}text",
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"key5": "${ONE}${TWO}",
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"key6": "text$",
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"key7": "$",
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"key8": "${1}${env:2}",
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"key9": "some${env:ENV_VALUE}text",
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"key10": "${env:" + expandedValue + "}",
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"key11": "${env:${ENV_VALUE}}",
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"key12": "env:MAP_VALUE_2}${ENV_VALUE}{",
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"key13": "$" + expandedValue,
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},
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}
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resolver, err := confmap.NewResolver(confmap.ResolverSettings{
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URIs: []string{filepath.Join("testdata", "expand-escaped-env.yaml")},
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ProviderFactories: []confmap.ProviderFactory{fileprovider.NewFactory(), envprovider.NewFactory()},
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ConverterFactories: []confmap.ConverterFactory{expandconverter.NewFactory()},
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DefaultScheme: tt.scheme,
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})
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require.NoError(t, err)
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// Test that expanded configs are the same with the simple config with no env vars.
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cfgMap, err := resolver.Resolve(context.Background())
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require.NoError(t, err)
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m := cfgMap.ToStringMap()
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assert.Equal(t, expectedMap, m)
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})
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}
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}

‎confmap/internal/e2e/go.mod

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@@ -5,6 +5,7 @@ go 1.21.0
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require (
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github.com/stretchr/testify v1.9.0
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go.opentelemetry.io/collector/confmap v0.105.0
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go.opentelemetry.io/collector/confmap/converter/expandconverter v0.105.0
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go.opentelemetry.io/collector/confmap/provider/envprovider v0.105.0
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go.opentelemetry.io/collector/confmap/provider/fileprovider v0.105.0
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go.opentelemetry.io/collector/featuregate v1.12.0
@@ -35,3 +36,5 @@ replace go.opentelemetry.io/collector/confmap/provider/envprovider => ../../prov
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replace go.opentelemetry.io/collector/featuregate => ../../../featuregate
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replace go.opentelemetry.io/collector/internal/globalgates => ../../../internal/globalgates
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replace go.opentelemetry.io/collector/confmap/converter/expandconverter => ../../converter/expandconverter

‎confmap/internal/e2e/testdata/expand-escaped-env.yaml

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test_map:
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# $$ -> escaped $
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key1: "$$ENV_VALUE"
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# $$$$ -> two escaped $
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key2: "$$$$ENV_VALUE"
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# $$ -> escaped $ + ${ENV_VALUE} expanded
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key3: "$$${ENV_VALUE}"
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# escaped $ in the middle
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key4: "some$${ENV_VALUE}text"
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# two escaped $
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key5: "$${ONE}$${TWO}"
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# trailing escaped $
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key6: "text$$"
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# escaped $ alone
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key7: "$$"
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# escaped number and uri
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key8: "$${1}$${env:2}"
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# escape provider
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key9: "some$${env:ENV_VALUE}text"
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# can escape outer when nested
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key10: "$${env:${ENV_VALUE}}"
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# can escape inner and outer when nested
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key11: "$${env:$${ENV_VALUE}}"
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# can escape partial
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key12: "env:MAP_VALUE_2}$${ENV_VALUE}{"
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# $$$ -> escaped $ + expanded env var
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key13: "$$${env:ENV_VALUE}"

‎confmap/resolver.go

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@@ -12,8 +12,6 @@ import (
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"go.uber.org/multierr"
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"go.uber.org/zap"
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"go.opentelemetry.io/collector/internal/globalgates"
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)
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// follows drive-letter specification:
@@ -173,13 +171,7 @@ func (mr *Resolver) Resolve(ctx context.Context) (*Conf, error) {
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if err != nil {
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return nil, err
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}
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if v, ok := val.(string); ok && globalgates.UseUnifiedEnvVarExpansionRules.IsEnabled() {
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cfgMap[k] = strings.ReplaceAll(v, "$$", "$")
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} else {
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cfgMap[k] = val
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}
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cfgMap[k] = val
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}
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retMap = NewFromStringMap(cfgMap)
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