Merge "apex: add / in file_contexts as system_file"

	output := android.PathForModuleOut(ctx, "file_contexts")

	rule := android.NewRuleBuilder()

	// remove old file

	rule.Command().Text("rm").FlagWithOutput("-f ", output)

	// copy file_contexts

	rule.Command().Text("cat").Input(fileContexts).Text(">>").Output(output)

	// new line

	rule.Command().Text("echo").Text(">>").Output(output)

	// force-label /apex_manifest.pb and / as system_file so that apexd can read them

	rule.Command().Text("echo").Flag("/apex_manifest\\\\.pb u:object_r:system_file:s0").Text(">>").Output(output)

	rule.Command().Text("echo").Flag("/ u:object_r:system_file:s0").Text(">>").Output(output)

	rule.Build(pctx, ctx, "file_contexts."+a.Name(), "Generate file_contexts")

	a.fileContexts = output.OutputPath