See how nginx includes its files

gistfile1.txt

#!/bin/bash

# Purpose:
#   See how nginx loads/includes its configuration files
#   Very useful to detect quickly where there errors come from.
# Author : Anh K. Huynh
# Date   : 2015 Aug 14th
# License: MIT
# Notes  : 
#   Some system has a different level. Here it's 3.
#   If you see the "negative argument" error, use a lower number, e.g., (level-2).
#   If you see some extra spaces before the first line, increase it, e.g, (level-4).
#   This magic number may vary ;) I don't want to fix that
#   because it simply makes the script complex.

# Ruby version

````
$ sudo strace -s 64 /path/to/your/nginx -t 2>&1 \
| grep '^open(' \
| grep /etc/nginx/ \
| ruby -n -e '
    if gs = $_.match(/^open\("(.+)".*= ([0-9]+)$/) then
      file, level = gs[1], gs[2].to_i;
      puts "#{" " * 2 * (level - 3)}#{file}";
    end
  '
````

# Gawk version

````
$ sudo strace -s 64 nginx -t 2>&1 \
| grep '^open(' \
| grep /etc/nginx/ \
| gawk -vMAGIC=3 '{
    n = match($0, /^open\("(.+)".*= ([0-9]+)$/,gs);
    if (n) {
      prefix = "";
      for (i=0; i < gs[2] - MAGIC; i++) {
        prefix = prefix "  ";
      };
      printf("%s%s\n", prefix, gs[1]);
    }
  }'
````

# Example output

````
/etc/nginx/nginx.conf
  /etc/nginx/mime.types
  /etc/nginx/sites/00_default.txt
    /etc/nginx/sites/00_openssl.txt
  /etc/nginx/sites/00_cache_paths.txt
  /etc/nginx/sites
  /etc/nginx/sites/00_acharset.conf
  /etc/nginx/sites/00_blacklist.conf
    /etc/nginx/sites/blacklist
    /etc/nginx/sites/blacklist/baidu.list
  /etc/nginx/sites/00_headers.conf
  /etc/nginx/sites/00_limit_reg.conf
  /etc/nginx/sites/2005.viettug.org.conf
    /etc/nginx/sites/00_exit.txt
    /etc/nginx/sites/00_errors.txt
    /etc/nginx/sites/jsmath.txt
  /etc/nginx/sites/2008.viettug.org.conf
    /etc/nginx/sites/00_exit.txt
    /etc/nginx/sites/00_errors.txt
    /etc/nginx/sites/jsmath.txt
  /etc/nginx/sites/archlinuxvn.org.conf
    /etc/nginx/sites/00_exit.txt
    /etc/nginx/sites/00_errors.txt
    /etc/nginx/sites/00_freezone.txt
  /etc/nginx/sites/cachnhiet.net.conf
    /etc/nginx/sites/00_exit.txt
````