func addToolsVersionForMachine(machine description.Machine, usedVersions map[version.Binary]bool) {
tools := machine.Tools()
usedVersions[tools.Version()] = true
for _, container := range machine.Containers() {
addToolsVersionForMachine(container, usedVersions)
}
}
func getUsedToolsVersions(model description.Model) map[version.Binary]bool {
// Iterate through the model for all tools, and make a map of them.
usedVersions := make(map[version.Binary]bool)
// It is most likely that the preconditions will limit the number of
// tools versions in use, but that is not depended on here.
for _, machine := range model.Machines() {
addToolsVersionForMachine(machine, usedVersions)
}
for _, service := range model.Services() {
for _, unit := range service.Units() {
tools := unit.Tools()
usedVersions[tools.Version()] = true
}
}
return usedVersions
}