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Run envsubst on container start to make templating easier
This entrypoint script will look for files in /etc/nginx/templates/ with a ".conf.template" suffix, run them through envsubst replacing defined environment variables, and output to /etc/nginx/conf.d/ preserving file name sans .template. Fixes nginx#232.
1 parent 47f11ab commit cd98e75

16 files changed

+264
-0
lines changed

‎mainline/alpine-perl/20-envsubst-on-templates.sh‎

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#!/bin/sh
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set -e
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ME=$(basename $0)
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auto_envsubst() {
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local template_dir="${NGINX_ENVSUBST_TEMPLATE_DIR:-/etc/nginx/templates}"
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local suffix="${NGINX_ENVSUBST_TEMPLATE_SUFFIX:-.template}"
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local output_dir="${NGINX_ENVSUBST_OUTPUT_DIR:-/etc/nginx/conf.d}"
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local template defined_envs relative_path output_path subdir
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defined_envs=$(printf '${%s} ' $(env | cut -d= -f1))
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[ -d "$template_dir" ] || return 0
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if [ ! -w "$output_dir" ]; then
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echo "$ME: ERROR: $template_dir exists, but $output_dir is not writable, exiting" 1>&2
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return 0
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fi
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for template in $(find "$template_dir" -follow -name "*$suffix"); do
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relative_path="${template#$template_dir/}"
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output_path="$output_dir/${relative_path%$suffix}"
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subdir=$(dirname "$relative_path")
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# create a subdirectory where the template file exists
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mkdir -p "$output_dir/$subdir"
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echo "$ME: Running envsubst on $template to $output_path"
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envsubst "$defined_envs" < "$template" > "$output_path"
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done
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}
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auto_envsubst
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exit 0

‎mainline/alpine-perl/Dockerfile‎

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@@ -110,6 +110,7 @@ RUN set -x \
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COPY docker-entrypoint.sh /
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COPY 10-listen-on-ipv6-by-default.sh /docker-entrypoint.d
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COPY 20-envsubst-on-templates.sh /docker-entrypoint.d
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ENTRYPOINT ["/docker-entrypoint.sh"]
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EXPOSE 80

‎mainline/alpine/20-envsubst-on-templates.sh‎

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#!/bin/sh
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set -e
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ME=$(basename $0)
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auto_envsubst() {
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local template_dir="${NGINX_ENVSUBST_TEMPLATE_DIR:-/etc/nginx/templates}"
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local suffix="${NGINX_ENVSUBST_TEMPLATE_SUFFIX:-.template}"
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local output_dir="${NGINX_ENVSUBST_OUTPUT_DIR:-/etc/nginx/conf.d}"
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local template defined_envs relative_path output_path subdir
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defined_envs=$(printf '${%s} ' $(env | cut -d= -f1))
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[ -d "$template_dir" ] || return 0
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if [ ! -w "$output_dir" ]; then
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echo "$ME: ERROR: $template_dir exists, but $output_dir is not writable, exiting" 1>&2
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return 0
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fi
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for template in $(find "$template_dir" -follow -name "*$suffix"); do
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relative_path="${template#$template_dir/}"
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output_path="$output_dir/${relative_path%$suffix}"
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subdir=$(dirname "$relative_path")
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# create a subdirectory where the template file exists
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mkdir -p "$output_dir/$subdir"
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echo "$ME: Running envsubst on $template to $output_path"
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envsubst "$defined_envs" < "$template" > "$output_path"
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done
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}
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auto_envsubst
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exit 0

‎mainline/alpine/Dockerfile‎

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@@ -109,6 +109,7 @@ RUN set -x \
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COPY docker-entrypoint.sh /
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COPY 10-listen-on-ipv6-by-default.sh /docker-entrypoint.d
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COPY 20-envsubst-on-templates.sh /docker-entrypoint.d
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ENTRYPOINT ["/docker-entrypoint.sh"]
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EXPOSE 80

‎mainline/buster-perl/20-envsubst-on-templates.sh‎

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#!/bin/sh
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set -e
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ME=$(basename $0)
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auto_envsubst() {
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local template_dir="${NGINX_ENVSUBST_TEMPLATE_DIR:-/etc/nginx/templates}"
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local suffix="${NGINX_ENVSUBST_TEMPLATE_SUFFIX:-.template}"
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local output_dir="${NGINX_ENVSUBST_OUTPUT_DIR:-/etc/nginx/conf.d}"
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local template defined_envs relative_path output_path subdir
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defined_envs=$(printf '${%s} ' $(env | cut -d= -f1))
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[ -d "$template_dir" ] || return 0
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if [ ! -w "$output_dir" ]; then
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echo "$ME: ERROR: $template_dir exists, but $output_dir is not writable, exiting" 1>&2
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return 0
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fi
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for template in $(find "$template_dir" -follow -name "*$suffix"); do
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relative_path="${template#$template_dir/}"
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output_path="$output_dir/${relative_path%$suffix}"
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subdir=$(dirname "$relative_path")
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# create a subdirectory where the template file exists
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mkdir -p "$output_dir/$subdir"
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echo "$ME: Running envsubst on $template to $output_path"
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envsubst "$defined_envs" < "$template" > "$output_path"
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done
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}
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auto_envsubst
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exit 0

‎mainline/buster-perl/Dockerfile‎

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@@ -101,6 +101,7 @@ RUN set -x \
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COPY docker-entrypoint.sh /
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COPY 10-listen-on-ipv6-by-default.sh /docker-entrypoint.d
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COPY 20-envsubst-on-templates.sh /docker-entrypoint.d
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ENTRYPOINT ["/docker-entrypoint.sh"]
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EXPOSE 80

‎mainline/buster/20-envsubst-on-templates.sh‎

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#!/bin/sh
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set -e
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ME=$(basename $0)
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auto_envsubst() {
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local template_dir="${NGINX_ENVSUBST_TEMPLATE_DIR:-/etc/nginx/templates}"
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local suffix="${NGINX_ENVSUBST_TEMPLATE_SUFFIX:-.template}"
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local output_dir="${NGINX_ENVSUBST_OUTPUT_DIR:-/etc/nginx/conf.d}"
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local template defined_envs relative_path output_path subdir
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defined_envs=$(printf '${%s} ' $(env | cut -d= -f1))
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[ -d "$template_dir" ] || return 0
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if [ ! -w "$output_dir" ]; then
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echo "$ME: ERROR: $template_dir exists, but $output_dir is not writable, exiting" 1>&2
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return 0
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fi
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for template in $(find "$template_dir" -follow -name "*$suffix"); do
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relative_path="${template#$template_dir/}"
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output_path="$output_dir/${relative_path%$suffix}"
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subdir=$(dirname "$relative_path")
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# create a subdirectory where the template file exists
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mkdir -p "$output_dir/$subdir"
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echo "$ME: Running envsubst on $template to $output_path"
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envsubst "$defined_envs" < "$template" > "$output_path"
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done
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}
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auto_envsubst
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exit 0

‎mainline/buster/Dockerfile‎

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COPY docker-entrypoint.sh /
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COPY 10-listen-on-ipv6-by-default.sh /docker-entrypoint.d
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COPY 20-envsubst-on-templates.sh /docker-entrypoint.d
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ENTRYPOINT ["/docker-entrypoint.sh"]
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EXPOSE 80

‎stable/alpine-perl/20-envsubst-on-templates.sh‎

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#!/bin/sh
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set -e
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ME=$(basename $0)
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auto_envsubst() {
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local template_dir="${NGINX_ENVSUBST_TEMPLATE_DIR:-/etc/nginx/templates}"
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local suffix="${NGINX_ENVSUBST_TEMPLATE_SUFFIX:-.template}"
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local output_dir="${NGINX_ENVSUBST_OUTPUT_DIR:-/etc/nginx/conf.d}"
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local template defined_envs relative_path output_path subdir
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defined_envs=$(printf '${%s} ' $(env | cut -d= -f1))
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[ -d "$template_dir" ] || return 0
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if [ ! -w "$output_dir" ]; then
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echo "$ME: ERROR: $template_dir exists, but $output_dir is not writable, exiting" 1>&2
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return 0
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fi
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for template in $(find "$template_dir" -follow -name "*$suffix"); do
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relative_path="${template#$template_dir/}"
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output_path="$output_dir/${relative_path%$suffix}"
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subdir=$(dirname "$relative_path")
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# create a subdirectory where the template file exists
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mkdir -p "$output_dir/$subdir"
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echo "$ME: Running envsubst on $template to $output_path"
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envsubst "$defined_envs" < "$template" > "$output_path"
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done
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}
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auto_envsubst
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exit 0

‎stable/alpine-perl/Dockerfile‎

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COPY docker-entrypoint.sh /
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COPY 10-listen-on-ipv6-by-default.sh /docker-entrypoint.d
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COPY 20-envsubst-on-templates.sh /docker-entrypoint.d
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ENTRYPOINT ["/docker-entrypoint.sh"]
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EXPOSE 80

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