nginx service

[djthorpe]

Implement an nginx service tasks:

• Start, stop, reload and test configuration
• Create new configurations, update, enable , disable and delete them
• Command-line client for control of nginx
• Add a client which can be used for client-side control
• Permissions on the TEMP directory need to be 755 rather than 700
• Permissions on any socket directory need to reflect User and Group in httpserver
• Add scopes for nginx for permissions
• Add data (for sockets/pid) and log paths
• Use a mutex lock to guard against concurrency in various places
• Add "readonly" property to Template so that it cannot be disabled, enabled, changed or deleted
• Add template variables for rending a configuration from a text/template
• Allow PATCH method to write body of enabled configuration
• Log rotation
• Check remaining TODO's

The repository link is:
https://github.com/mutablelogic/go-server/tree/v4/pkg/handler/nginx

[djthorpe]

Additional methods:

• Available() []File - returns available configs as a set of unqiue strings (note we should also provide the state - so enabled or disabled)
• Enable(keyword string,vars ....any) error - enable a configuration through a template, returns error if test was not successful
• Disable(keyword string) error - disable a configuration
• Add(keyword string,data []byte) error - add a configuration (does not enable it)
• Delete(keyword string) error - delete a configuration, disables it if enabled

[djthorpe]

PR's #40 #39