Caddy: php_fastcgi: allow setting root

[yann-soubeyrand]

Hi,

It could be good to be able to configure the root of a php_fastcgi directive like this:

root /usr/share/caddy

php_fastcgi 127.0.0.1:9000 {
  root /var/www/html
}

This would allow path translation between Caddy and PHP-FPM. For example, we could have the application code in Caddy's default root (/usr/share/caddy) in the Caddy container and in PHP's default root (/var/www/html) in the PHP container.

A workaround is to use the expanded form of php_fastcgi:

root /usr/share/caddy

# Add trailing slash for directory requests
@canonicalPath {
    file {
        try_files {path}/index.php
    }
    not {
        path */
    }
}
redir @canonicalPath {path}/ 308

# If the requested file does not exist, try index files
try_files {path} {path}/index.php index.php

# Proxy PHP files to the FastCGI responder
@phpFiles {
    path *.php
}
reverse_proxy @phpFiles <php-fpm_gateway> {
    transport fastcgi {
                root /var/www/html
        split .php
    }
}

[francislavoie]

This will get solved by this PR: https://github.com/caddyserver/caddy/pull/3255