Adds a new `windows` command which is available when running on
a Windows hosts. The command includes two new subcommands:
* `service install`
* `service uninstall`
The `service install` command will install the called binary into
the Windows program files directory, create a new Windows service,
setup configuration and data directories, and register the service
with the Window eventlog. If the service and/or binary already
exist, the service will be stopped, service and eventlog updated
if needed, binary replaced, and the service started again.
The `service uninstall` command will stop the service, remove the
Windows service, and deregister the service with the eventlog. It
will not remove the configuration/data directory nor will it remove
the installed binary.
Defines a `winsvc.Event` type which can be sent using the `winsvc.SendEvent`
function. If nomad is running on Windows and can send to the Windows
Eventlog the event will be sent. Initial event types are defined for
starting, ready, stopped, and log message.
The `winsvc.EventLogger` provides an `io.WriteCloser` that can be included
in the logger's writers collection. It will extract the log level from
log lines and write them appropriately to the eventlog. The eventlog
only supports error, warning, and info levels so messages with other
levels will be ignored.
A new configuration block is included for enabling logging to the
eventlog. Logging must be enabled with the `log_level` option and
the `eventlog.level` value can then be of the same or higher severity.
Provides interfaces to the Windows service manager and Windows
services. These interfaces support creating new Windows services,
deleting Windows services, configuring Windows services, and
registering/deregistering services with Windows Eventlog.
A path helper is included to support expansion of paths using a
subset of known folder IDs.
A privileged helper is included to check that the process is
currently being executed with elevated privileges, which are
required for managing Windows services and modifying the registry.
This is the basic code to add the Windows Service Manager hooks to Nomad.
Includes vendoring golang.org/x/sys/windows/svc and added Docs:
* guide for installing as a windows service.
* configuration for logging to file from PR #6429
