feat(snapshots): Implement volume shadow copy support on Windows (#3543)

* Implement volume shadow copy support on Windows

* Update go-vss version

* Fix unused variables

* Rename upload_actions*.go files

* Move vss settings to a separate policy section

* Handle existing shadow copy root

* Fix tests

* Fix lint issues

* Add cli policy test

* Add OS snapshot integration test

* Add GitHub Actions VSS test

* Fix "Incorrect function" error for root VSS snapshots

* Rename err to finalErr in createOSSnapshot

* Add OSSnapshotMode test

* Do not modify paths starting with \\?\ on Windows

* Allow warning messages in logfile tests

* Fix ignorefs not wrapping OS snapshot directory

* Retry VSS creation if another op was in progress

---------

Co-authored-by: Jarek Kowalski <jaak@jkowalski.net>

cli/command_policy_set.go

@@ -24,6 +24,7 @@ type commandPolicySet struct {
 	policyLoggingFlags
 	policyRetentionFlags
 	policySchedulingFlags
+	policyOSSnapshotFlags
 	policyUploadFlags
 }
 
@@ -39,6 +40,7 @@ func (c *commandPolicySet) setup(svc appServices, parent commandParent) {
 	c.policyLoggingFlags.setup(cmd)
 	c.policyRetentionFlags.setup(cmd)
 	c.policySchedulingFlags.setup(cmd)
+	c.policyOSSnapshotFlags.setup(cmd)
 	c.policyUploadFlags.setup(cmd)
 
 	cmd.Action(svc.repositoryWriterAction(c.run))
@@ -112,6 +114,10 @@ func (c *commandPolicySet) setPolicyFromFlags(ctx context.Context, p *policy.Pol
 		return errors.Wrap(err, "actions policy")
 	}
 
+	if err := c.setOSSnapshotPolicyFromFlags(ctx, &p.OSSnapshotPolicy, changeCount); err != nil {
+		return errors.Wrap(err, "OS snapshot policy")
+	}
+
 	if err := c.setLoggingPolicyFromFlags(ctx, &p.LoggingPolicy, changeCount); err != nil {
 		return errors.Wrap(err, "actions policy")
 	}