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Add an entrypoint for configuring and templating streams #782

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Add an entrypoint for configuring and templating streams #782

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015c5c8
Add an entrypoint for configuring and templating streams
iain-henderson May 18, 2023
5ade6cb
Consolidate into one templating entrypoint script
iain-henderson May 23, 2023
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35 changes: 35 additions & 0 deletions entrypoint/20-envsubst-on-templates.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -10,12 +10,28 @@ entrypoint_log() {
fi
}

add_stream_block() {
if grep -q -E "\s*stream\s*\{" /etc/nginx/nginx.conf; then
entrypoint_log "/etc/nginx/nginx.conf contains a stream block; include /etc/nginx/stream_conf.d/*.conf to enable stream templates"
else
cat << END >> /etc/nginx/nginx.conf
stream {
include /etc/nginx/stream_conf.d/*.conf;
}
END
entrypoint_log "Appended stream block to /etc/nginx/nginx.conf to include /etc/nginx/stream_conf.d/*.conf"
fi
}

auto_envsubst() {
local template_dir="${NGINX_ENVSUBST_TEMPLATE_DIR:-/etc/nginx/templates}"
local suffix="${NGINX_ENVSUBST_TEMPLATE_SUFFIX:-.template}"
local output_dir="${NGINX_ENVSUBST_OUTPUT_DIR:-/etc/nginx/conf.d}"
local filter="${NGINX_ENVSUBST_FILTER:-}"

local stream_suffix="${NGINX_ENVSUBST_STREAM_TEMPLATE_SUFFIX:-.stream-template}"
local stream_output_dir="${NGINX_ENVSUBST_STREAM_OUTPUT_DIR:-/etc/nginx/stream_conf.d}"

local template defined_envs relative_path output_path subdir
defined_envs=$(printf '${%s} ' $(awk "END { for (name in ENVIRON) { print ( name ~ /${filter}/ ) ? name : \"\" } }" < /dev/null ))
[ -d "$template_dir" ] || return 0
Expand All @@ -32,6 +48,25 @@ auto_envsubst() {
entrypoint_log "$ME: Running envsubst on $template to $output_path"
envsubst "$defined_envs" < "$template" > "$output_path"
done

# Print the first file with the stream suffix, this will be false if there are none
if test -n "$(find "$template_dir" -maxdepth 1 -name "*$stream_suffix" -print -quit)"; then
# http templates will still have been processed and available
if [ ! -w "$stream_output_dir" ]; then
entrypoint_log "$ME: ERROR: $template_dir exists, but $stream_output_dir is not writable"
return 0
fi
add_stream_block
find "$template_dir" -follow -type f -name "*$stream_suffix" -print | while read -r template; do
relative_path="${template#$template_dir/}"
output_path="$stream_output_dir/${relative_path%$stream_suffix}"
subdir=$(dirname "$relative_path")
# create a subdirectory where the template file exists
mkdir -p "$stream_output_dir/$subdir"
entrypoint_log "$ME: Running envsubst on $template to $output_path"
envsubst "$defined_envs" < "$template" > "$output_path"
done
fi
}

auto_envsubst
Expand Down