Is this how variable (set $var) inheritance works?

[Edho Arief]

On Sat, Feb 4, 2012 at 8:15 AM, Max <nginxyz at mail.ru> wrote:
>
> This feature/bug is especially confusing when you use variables
> inside root and alias directives, because the nested location blocks
> will inherit the root and alias contents (unless specifically set),
> which will have any uninitialized inherited variable names replaced
> with "", so "/home/$variable/abc/$dir/" would become "/home//abc//".
>

At least this makes nested location useless for cases like this.
Instead of one regex with captures (and then use nested location), I
had to do this instead:

location /~ {
  location ~ ^/~([^/]+)/(.+\.php)$ {
    alias /home/$1/public_html/$2;
    if (!-f $request_filename) { return 404; }
    include fastcgi_params;
    fastcgi_param SCRIPT_FILENAME $request_filename;
    fastcgi_pass 127.0.0.1:9000;
  }
  location ~ ^/~([^/]+)(|/.*)$ {
    alias /home/$1/public_html/$2;
    index index.html;
  }
}

Or use map (and since it's currently impossible to do non-simple regex
capture, I had to use two maps):

map $uri $user {
  ~^/~(?P<user1>[^/]+)(|/.*)$ $user1;
}
map $uri $file {
  ~^/~[^/]+(?P<file1>|/.*)$ $file1;
}
server {
  ...
  location /~ {
    location ~ ^ {
      alias /home/$user/public_html/$file;
      location ~ \.php$ {
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $request_filename;
        fastcgi_pass 127.0.0.1:9000;
      }
    }
  }
}


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