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Adds recover_origin task to Fabric

Whilst we can fail the site to mirrors easily using Fabric, we can't restoreas easily - at least, it's not a super-quick Fabric script.This makes it a nice quick fix. The logic is as follows: - Re-enable Puppet on the affected class - Run Puppet, with some degree of verbosity for confidence - This should restore thewww.gov.uk Nginx vhost - This should restart Nginx because the configuration has changed - Prints a success messageChanges the fail_to_mirror success message to point to using this task infuture to recover back to origin from the mirrors.

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`‎incident.py‎`

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Original file line number	Diff line number	Diff line change
`@@ -10,3 +10,11 @@ def fail_to_mirror():`
`10`	`10`	`nginx.disable_vhost("www.gov.uk")`
`11`	`11`	`nginx.force_restart()`
`12`	`12`	`print("Disabled Puppet and www.gov.uk vhost, remember to re-enable and re-run puppet to restore previous state")`
	`13`	`+`
	`14`	`+@task`
	`15`	`+@roles('class-cache')`
	`16`	`+defrecover_origin():`
	`17`	`+"""Recovers GOV.UK to serve from origin after incident.fail_to_mirror has been invoked"""`
	`18`	`+puppet.enable()`
	`19`	`+puppet.agent("--test")`
	`20`	`+print("Puppet has been re-enabled, has run and the site should now be serving from origin as normal.")`

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Commit99dbfe4

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`‎incident.py‎`

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