Merge pull request #26421 from hashicorp/jbardin/ignore-changes-map
allow ignore_changes to reference any map key
This commit is contained in:
James Bardin
GitHub
commit
ee564a5ceb
|
|
@ -608,38 +608,127 @@ func processIgnoreChangesIndividual(prior, config cty.Value, ignoreChanges []hcl
|
|||
ignoreChangesPath[i] = path
|
||||
}
|
||||
|
||||
var diags tfdiags.Diagnostics
|
||||
ret, _ := cty.Transform(config, func(path cty.Path, v cty.Value) (cty.Value, error) {
|
||||
// First we must see if this is a path that's being ignored at all.
|
||||
// We're looking for an exact match here because this walk will visit
|
||||
// leaf values first and then their containers, and we want to do
|
||||
// the "ignore" transform once we reach the point indicated, throwing
|
||||
// away any deeper values we already produced at that point.
|
||||
var ignoreTraversal hcl.Traversal
|
||||
for i, candidate := range ignoreChangesPath {
|
||||
if path.Equals(candidate) {
|
||||
ignoreTraversal = ignoreChanges[i]
|
||||
type ignoreChange struct {
|
||||
// Path is the full path, minus any trailing map index
|
||||
path cty.Path
|
||||
// Value is the value we are to retain at the above path. If there is a
|
||||
// key value, this must be a map and the desired value will be at the
|
||||
// key index.
|
||||
value cty.Value
|
||||
// Key is the index key if the ignored path ends in a map index.
|
||||
key cty.Value
|
||||
}
|
||||
var ignoredValues []ignoreChange
|
||||
|
||||
// Find the actual changes first and store them in the ignoreChange struct.
|
||||
// If the change was to a map value, and the key doesn't exist in the
|
||||
// config, it would never be visited in the transform walk.
|
||||
for _, icPath := range ignoreChangesPath {
|
||||
key := cty.NullVal(cty.String)
|
||||
// check for a map index, since maps are the only structure where we
|
||||
// could have invalid path steps.
|
||||
last, ok := icPath[len(icPath)-1].(cty.IndexStep)
|
||||
if ok {
|
||||
if last.Key.Type() == cty.String {
|
||||
icPath = icPath[:len(icPath)-1]
|
||||
key = last.Key
|
||||
}
|
||||
}
|
||||
if ignoreTraversal == nil {
|
||||
return v, nil
|
||||
|
||||
// The structure should have been validated already, and we already
|
||||
// trimmed the trailing map index. Any other intermediate index error
|
||||
// means we wouldn't be able to apply the value below, so no need to
|
||||
// record this.
|
||||
p, err := icPath.Apply(prior)
|
||||
if err != nil {
|
||||
continue
|
||||
}
|
||||
c, err := icPath.Apply(config)
|
||||
if err != nil {
|
||||
continue
|
||||
}
|
||||
|
||||
// If we're able to follow the same path through the prior value,
|
||||
// we'll take the value there instead, effectively undoing the
|
||||
// change that was planned.
|
||||
priorV, diags := hcl.ApplyPath(prior, path, nil)
|
||||
if diags.HasErrors() {
|
||||
// We just ignore the errors and move on here, since we assume it's
|
||||
// just because the prior value was a slightly-different shape.
|
||||
// It could potentially also be that the traversal doesn't match
|
||||
// the schema, but we should've caught that during the validate
|
||||
// walk if so.
|
||||
return v, nil
|
||||
// If this is a map, it is checking the entire map value for equality
|
||||
// rather than the individual key. This means that the change is stored
|
||||
// here even if our ignored key doesn't change. That is OK since it
|
||||
// won't cause any changes in the transformation, but allows us to skip
|
||||
// breaking up the maps and checking for key existence here too.
|
||||
eq := p.Equals(c)
|
||||
if eq.IsKnown() && eq.False() {
|
||||
// there a change to ignore at this path, store the prior value
|
||||
ignoredValues = append(ignoredValues, ignoreChange{icPath, p, key})
|
||||
}
|
||||
return priorV, nil
|
||||
}
|
||||
|
||||
if len(ignoredValues) == 0 {
|
||||
return config, nil
|
||||
}
|
||||
|
||||
ret, _ := cty.Transform(config, func(path cty.Path, v cty.Value) (cty.Value, error) {
|
||||
for _, ignored := range ignoredValues {
|
||||
if !path.Equals(ignored.path) {
|
||||
return v, nil
|
||||
}
|
||||
|
||||
// no index, so we can return the entire value
|
||||
if ignored.key.IsNull() {
|
||||
return ignored.value, nil
|
||||
}
|
||||
|
||||
// we have an index key, so make sure we have a map
|
||||
if !v.Type().IsMapType() {
|
||||
// we'll let other validation catch any type mismatch
|
||||
return v, nil
|
||||
}
|
||||
|
||||
// Now we know we are ignoring a specific index of this map, so get
|
||||
// the config map and modify, add, or remove the desired key.
|
||||
var configMap map[string]cty.Value
|
||||
var priorMap map[string]cty.Value
|
||||
|
||||
if !v.IsNull() {
|
||||
if !v.IsKnown() {
|
||||
// if the entire map is not known, we can't ignore any
|
||||
// specific keys yet.
|
||||
continue
|
||||
}
|
||||
configMap = v.AsValueMap()
|
||||
}
|
||||
if configMap == nil {
|
||||
configMap = map[string]cty.Value{}
|
||||
}
|
||||
|
||||
// We also need to create a prior map, so we can check for
|
||||
// existence while getting the value. Value.Index will always
|
||||
// return null.
|
||||
if !ignored.value.IsNull() {
|
||||
priorMap = ignored.value.AsValueMap()
|
||||
}
|
||||
if priorMap == nil {
|
||||
priorMap = map[string]cty.Value{}
|
||||
}
|
||||
|
||||
key := ignored.key.AsString()
|
||||
priorElem, keep := priorMap[key]
|
||||
|
||||
switch {
|
||||
case !keep:
|
||||
// this didn't exist in the old map value, so we're keeping the
|
||||
// "absence" of the key by removing it from the config
|
||||
delete(configMap, key)
|
||||
default:
|
||||
configMap[key] = priorElem
|
||||
}
|
||||
|
||||
if len(configMap) == 0 {
|
||||
return cty.MapValEmpty(v.Type().ElementType()), nil
|
||||
}
|
||||
|
||||
return cty.MapVal(configMap), nil
|
||||
}
|
||||
return v, nil
|
||||
})
|
||||
return ret, diags
|
||||
return ret, nil
|
||||
}
|
||||
|
||||
// a group of key-*ResourceAttrDiff pairs from the same flatmapped container
|
||||
|
|
|
|||
|
|
@ -68,6 +68,164 @@ func TestProcessIgnoreChangesIndividual(t *testing.T) {
|
|||
"b": cty.StringVal("new b value"),
|
||||
}),
|
||||
},
|
||||
"list_index": {
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.ListVal([]cty.Value{
|
||||
cty.StringVal("a0 value"),
|
||||
cty.StringVal("a1 value"),
|
||||
}),
|
||||
"b": cty.StringVal("b value"),
|
||||
}),
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.ListVal([]cty.Value{
|
||||
cty.StringVal("new a0 value"),
|
||||
cty.StringVal("new a1 value"),
|
||||
}),
|
||||
"b": cty.StringVal("new b value"),
|
||||
}),
|
||||
[]string{"a[1]"},
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.ListVal([]cty.Value{
|
||||
cty.StringVal("new a0 value"),
|
||||
cty.StringVal("a1 value"),
|
||||
}),
|
||||
"b": cty.StringVal("new b value"),
|
||||
}),
|
||||
},
|
||||
"map_index": {
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapVal(map[string]cty.Value{
|
||||
"a0": cty.StringVal("a0 value"),
|
||||
"a1": cty.StringVal("a1 value"),
|
||||
}),
|
||||
"b": cty.StringVal("b value"),
|
||||
}),
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapVal(map[string]cty.Value{
|
||||
"a0": cty.StringVal("new a0 value"),
|
||||
"a1": cty.StringVal("new a1 value"),
|
||||
}),
|
||||
"b": cty.StringVal("b value"),
|
||||
}),
|
||||
[]string{`a["a1"]`},
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapVal(map[string]cty.Value{
|
||||
"a0": cty.StringVal("new a0 value"),
|
||||
"a1": cty.StringVal("a1 value"),
|
||||
}),
|
||||
"b": cty.StringVal("b value"),
|
||||
}),
|
||||
},
|
||||
"map_index_no_config": {
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapVal(map[string]cty.Value{
|
||||
"a0": cty.StringVal("a0 value"),
|
||||
"a1": cty.StringVal("a1 value"),
|
||||
}),
|
||||
"b": cty.StringVal("b value"),
|
||||
}),
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.NullVal(cty.Map(cty.String)),
|
||||
"b": cty.StringVal("b value"),
|
||||
}),
|
||||
[]string{`a["a1"]`},
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapVal(map[string]cty.Value{
|
||||
"a1": cty.StringVal("a1 value"),
|
||||
}),
|
||||
"b": cty.StringVal("b value"),
|
||||
}),
|
||||
},
|
||||
"missing_map_index": {
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapVal(map[string]cty.Value{
|
||||
"a0": cty.StringVal("a0 value"),
|
||||
"a1": cty.StringVal("a1 value"),
|
||||
}),
|
||||
"b": cty.StringVal("b value"),
|
||||
}),
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapValEmpty(cty.String),
|
||||
"b": cty.StringVal("b value"),
|
||||
}),
|
||||
[]string{`a["a1"]`},
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapVal(map[string]cty.Value{
|
||||
"a1": cty.StringVal("a1 value"),
|
||||
}),
|
||||
"b": cty.StringVal("b value"),
|
||||
}),
|
||||
},
|
||||
"missing_map_index_empty": {
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapValEmpty(cty.String),
|
||||
}),
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapVal(map[string]cty.Value{
|
||||
"a": cty.StringVal("a0 value"),
|
||||
}),
|
||||
}),
|
||||
[]string{`a["a"]`},
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapValEmpty(cty.String),
|
||||
}),
|
||||
},
|
||||
"missing_map_index_to_object": {
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapVal(map[string]cty.Value{
|
||||
"a": cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.StringVal("aa0"),
|
||||
"b": cty.StringVal("ab0"),
|
||||
}),
|
||||
"b": cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.StringVal("ba0"),
|
||||
"b": cty.StringVal("bb0"),
|
||||
}),
|
||||
}),
|
||||
}),
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapValEmpty(
|
||||
cty.Object(map[string]cty.Type{
|
||||
"a": cty.String,
|
||||
"b": cty.String,
|
||||
}),
|
||||
),
|
||||
}),
|
||||
// we expect the config to be used here, as the ignore changes was
|
||||
// `a["a"].b`, but the change was larger than that removing
|
||||
// `a["a"]` entirely.
|
||||
[]string{`a["a"].b`},
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapValEmpty(
|
||||
cty.Object(map[string]cty.Type{
|
||||
"a": cty.String,
|
||||
"b": cty.String,
|
||||
}),
|
||||
),
|
||||
}),
|
||||
},
|
||||
"missing_prior_map_index": {
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapVal(map[string]cty.Value{
|
||||
"a0": cty.StringVal("a0 value"),
|
||||
}),
|
||||
"b": cty.StringVal("b value"),
|
||||
}),
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapVal(map[string]cty.Value{
|
||||
"a0": cty.StringVal("a0 value"),
|
||||
"a1": cty.StringVal("new a1 value"),
|
||||
}),
|
||||
"b": cty.StringVal("b value"),
|
||||
}),
|
||||
[]string{`a["a1"]`},
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.MapVal(map[string]cty.Value{
|
||||
"a0": cty.StringVal("a0 value"),
|
||||
}),
|
||||
"b": cty.StringVal("b value"),
|
||||
}),
|
||||
},
|
||||
"object attribute": {
|
||||
cty.ObjectVal(map[string]cty.Value{
|
||||
"a": cty.ObjectVal(map[string]cty.Value{
|
||||
|
|
|
|||
|
|
@ -638,16 +638,22 @@ meta-arguments are supported:
|
|||
any difference in the current settings of a real infrastructure object
|
||||
and plans to update the remote object to match configuration.
|
||||
|
||||
In some rare cases, settings of a remote object are modified by processes
|
||||
outside of Terraform, which Terraform would then attempt to "fix" on the
|
||||
next run. In order to make Terraform share management responsibilities
|
||||
of a single object with a separate process, the `ignore_changes`
|
||||
meta-argument specifies resource attributes that Terraform should ignore
|
||||
when planning updates to the associated remote object.
|
||||
The `ignore_chages` feature is intended to be used when a resource is
|
||||
created with references to data that may change in the future, but should
|
||||
not effect said resource after its creation. In some rare cases, settings
|
||||
of a remote object are modified by processes outside of Terraform, which
|
||||
Terraform would then attempt to "fix" on the next run. In order to make
|
||||
Terraform share management responsibilities of a single object with a
|
||||
separate process, the `ignore_changes` meta-argument specifies resource
|
||||
attributes that Terraform should ignore when planning updates to the
|
||||
associated remote object.
|
||||
|
||||
The arguments corresponding to the given attribute names are considered
|
||||
when planning a _create_ operation, but are ignored when planning an
|
||||
_update_.
|
||||
_update_. The arugments are the relative address of the attributes in the
|
||||
resource. Map and list elements can be referenced using index notation,
|
||||
like `tags["Name"]` and `list[0]` respectively.
|
||||
|
||||
|
||||
```hcl
|
||||
resource "aws_instance" "example" {
|
||||
|
|
@ -663,35 +669,6 @@ meta-arguments are supported:
|
|||
}
|
||||
```
|
||||
|
||||
You can also ignore specific map elements by writing references like
|
||||
`tags["Name"]` in the `ignore_changes` list, though with an important
|
||||
caveat: the ignoring applies only to in-place updates to an existing
|
||||
key. Adding or removing a key is treated by Terraform as a change to the
|
||||
containing map itself rather than to the individual key, and so if you
|
||||
wish to ignore changes to a particular tag made by an external system
|
||||
you must ensure that the Terraform configuration creates a placeholder
|
||||
element for that tag name so that the external system changes will be
|
||||
understood as an in-place edit of that key:
|
||||
|
||||
```hcl
|
||||
resource "aws_instance" "example" {
|
||||
# ...
|
||||
|
||||
tags = {
|
||||
# Initial value for Name is overridden by our automatic scheduled
|
||||
# re-tagging process; changes to this are ignored by ignore_changes
|
||||
# below.
|
||||
Name = "placeholder"
|
||||
}
|
||||
|
||||
lifecycle {
|
||||
ignore_changes = [
|
||||
tags["Name"],
|
||||
]
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
Instead of a list, the special keyword `all` may be used to instruct
|
||||
Terraform to ignore _all_ attributes, which means that Terraform can
|
||||
create and destroy the remote object but will never propose updates to it.
|
||||
|
|
|
|||
Loading…
Reference in New Issue