// updateStack updates a stack
// template is url to a template or empty string to reuse previous
// changes is a list of parameter changes to make (does not need to include every param)
func (p *AWSProvider) updateStack(name string, template string, changes map[string]string) error {
cache.Clear("describeStacks", nil)
cache.Clear("describeStacks", name)
req := &cloudformation.UpdateStackInput{
Capabilities: []*string{aws.String("CAPABILITY_IAM")},
StackName: aws.String(name),
}
params := map[string]bool{}
pexisting := map[string]bool{}
stack, err := p.describeStack(name)
if err != nil {
return err
}
for _, p := range stack.Parameters {
pexisting[*p.ParameterKey] = true
}
if template != "" {
req.TemplateURL = aws.String(template)
fp, err := formationParameters(template)
if err != nil {
return err
}
for p := range fp {
params[p] = true
}
} else {
req.UsePreviousTemplate = aws.Bool(true)
for param := range pexisting {
params[param] = true
}
}
sorted := []string{}
for param := range params {
sorted = append(sorted, param)
}
// sort params for easier testing
sort.Strings(sorted)
for _, param := range sorted {
if value, ok := changes[param]; ok {
req.Parameters = append(req.Parameters, &cloudformation.Parameter{
ParameterKey: aws.String(param),
ParameterValue: aws.String(value),
})
} else if pexisting[param] {
req.Parameters = append(req.Parameters, &cloudformation.Parameter{
ParameterKey: aws.String(param),
UsePreviousValue: aws.Bool(true),
})
}
}
_, err = p.cloudformation().UpdateStack(req)
cache.Clear("describeStacks", nil)
cache.Clear("describeStacks", name)
return err
}
func (p *AWSProvider) updateStack(input *cloudformation.UpdateStackInput) (*cloudformation.UpdateStackOutput, error) {
cache.Clear("describeStacks", nil)
cache.Clear("describeStacks", input.StackName)
return p.cloudformation().UpdateStack(input)
}