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feat: container filters environment variable #700

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feat: container filters environment variable #700

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e0d2383
feat: container filters environment variable
buchdag Oct 1, 2025
615f63a
refactor: handle blank container filters env var
buchdag Oct 2, 2025
782c9f3
fix: -container-filter should override the env var
buchdag Oct 7, 2025
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2 changes: 2 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -156,6 +156,8 @@ Environment Variables:
DOCKER_HOST - default value for -endpoint
DOCKER_CERT_PATH - directory path containing key.pem, cert.pem and ca.pem
DOCKER_TLS_VERIFY - enable client TLS verification
DOCKER_CONTAINER_FILTERS - comma separated list of container filters for inclusion by docker-gen.
Filters supplied through this variable are ignored if -container-filter is provided.
```

If no `<dest>` file is specified, the output is sent to stdout. Mainly useful for debugging.
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11 changes: 11 additions & 0 deletions cmd/docker-gen/main.go
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Expand Up @@ -86,6 +86,8 @@ Environment Variables:
DOCKER_HOST - default value for -endpoint
DOCKER_CERT_PATH - directory path containing key.pem, cert.pem and ca.pem
DOCKER_TLS_VERIFY - enable client TLS verification
DOCKER_CONTAINER_FILTERS - comma separated list of container filters for inclusion by docker-gen.
Filters supplied through this variable are ignored if -container-filter is provided.
`)
println(`For more information, see https://github.com/nginx-proxy/docker-gen`)
}
Expand Down Expand Up @@ -149,6 +151,15 @@ func initFlags() {

flag.Usage = usage
flag.Parse()

// set containerFilter with DOCKER_CONTAINER_FILTERS if it's set and no -container-filter option was provided
if filtersEnvVar, found := os.LookupEnv("DOCKER_CONTAINER_FILTERS"); found && len(containerFilter) == 0 {
for filter := range strings.SplitSeq(filtersEnvVar, ",") {
if strings.TrimSpace(filter) != "" {
containerFilter.Set(filter)
}
}
}
}

func main() {
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