Hello, I would like to implement conditional root directory in nginx. If one directory exists, nginx will use it as root dir, otherwise, different dir will be used. Here is my solution so far:

server {
listen 80;
server_name *.dev;
root /var/www/$host/public;

location / {
index index.html index.htm index.php;
try_files $uri $uri/ /index.php?$query_string @fallback;
}

location @fallback {
root /var/www/$host;
index index.html index.htm index.php;
try_files $uri $uri/ /index.php?$query_string;
}

location ~ \.php$ {
fastcgi_pass unix:/var/run/php5-fpm.sock;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
}

There is a problem with @fallback (when public dir doesn't exists) - php files weren't processed (in browser I get error: No input file specified.).
Anyone have a solution or better idea to accomplish what I need?

Thanks

Looks like your root and document_root are not set properly when using fallback.

Isn't $document_root equal to $root? Anyway, any idea how to solve it?

It should be when root is set properly, when you get " No input file specified" it means php can't find the php file so doc root is pointing to a wrong path, there should be a way to display where root is pointing to so you can find out where its going wrong, also check php.ini for path/openbasedir/docroot values. Or pass a fixed path instead of $document_root.