--- /dev/null
+package terraform
+
+import (
+ "bufio"
+ "bytes"
+ "fmt"
+ "reflect"
+ "regexp"
+ "sort"
+ "strings"
+ "sync"
+
+ "github.com/mitchellh/copystructure"
+)
+
+// DiffChangeType is an enum with the kind of changes a diff has planned.
+type DiffChangeType byte
+
+const (
+ DiffInvalid DiffChangeType = iota
+ DiffNone
+ DiffCreate
+ DiffUpdate
+ DiffDestroy
+ DiffDestroyCreate
+)
+
+// multiVal matches the index key to a flatmapped set, list or map
+var multiVal = regexp.MustCompile(`\.(#|%)$`)
+
+// Diff trackes the changes that are necessary to apply a configuration
+// to an existing infrastructure.
+type Diff struct {
+ // Modules contains all the modules that have a diff
+ Modules []*ModuleDiff
+}
+
+// Prune cleans out unused structures in the diff without affecting
+// the behavior of the diff at all.
+//
+// This is not safe to call concurrently. This is safe to call on a
+// nil Diff.
+func (d *Diff) Prune() {
+ if d == nil {
+ return
+ }
+
+ // Prune all empty modules
+ newModules := make([]*ModuleDiff, 0, len(d.Modules))
+ for _, m := range d.Modules {
+ // If the module isn't empty, we keep it
+ if !m.Empty() {
+ newModules = append(newModules, m)
+ }
+ }
+ if len(newModules) == 0 {
+ newModules = nil
+ }
+ d.Modules = newModules
+}
+
+// AddModule adds the module with the given path to the diff.
+//
+// This should be the preferred method to add module diffs since it
+// allows us to optimize lookups later as well as control sorting.
+func (d *Diff) AddModule(path []string) *ModuleDiff {
+ m := &ModuleDiff{Path: path}
+ m.init()
+ d.Modules = append(d.Modules, m)
+ return m
+}
+
+// ModuleByPath is used to lookup the module diff for the given path.
+// This should be the preferred lookup mechanism as it allows for future
+// lookup optimizations.
+func (d *Diff) ModuleByPath(path []string) *ModuleDiff {
+ if d == nil {
+ return nil
+ }
+ for _, mod := range d.Modules {
+ if mod.Path == nil {
+ panic("missing module path")
+ }
+ if reflect.DeepEqual(mod.Path, path) {
+ return mod
+ }
+ }
+ return nil
+}
+
+// RootModule returns the ModuleState for the root module
+func (d *Diff) RootModule() *ModuleDiff {
+ root := d.ModuleByPath(rootModulePath)
+ if root == nil {
+ panic("missing root module")
+ }
+ return root
+}
+
+// Empty returns true if the diff has no changes.
+func (d *Diff) Empty() bool {
+ if d == nil {
+ return true
+ }
+
+ for _, m := range d.Modules {
+ if !m.Empty() {
+ return false
+ }
+ }
+
+ return true
+}
+
+// Equal compares two diffs for exact equality.
+//
+// This is different from the Same comparison that is supported which
+// checks for operation equality taking into account computed values. Equal
+// instead checks for exact equality.
+func (d *Diff) Equal(d2 *Diff) bool {
+ // If one is nil, they must both be nil
+ if d == nil || d2 == nil {
+ return d == d2
+ }
+
+ // Sort the modules
+ sort.Sort(moduleDiffSort(d.Modules))
+ sort.Sort(moduleDiffSort(d2.Modules))
+
+ // Copy since we have to modify the module destroy flag to false so
+ // we don't compare that. TODO: delete this when we get rid of the
+ // destroy flag on modules.
+ dCopy := d.DeepCopy()
+ d2Copy := d2.DeepCopy()
+ for _, m := range dCopy.Modules {
+ m.Destroy = false
+ }
+ for _, m := range d2Copy.Modules {
+ m.Destroy = false
+ }
+
+ // Use DeepEqual
+ return reflect.DeepEqual(dCopy, d2Copy)
+}
+
+// DeepCopy performs a deep copy of all parts of the Diff, making the
+// resulting Diff safe to use without modifying this one.
+func (d *Diff) DeepCopy() *Diff {
+ copy, err := copystructure.Config{Lock: true}.Copy(d)
+ if err != nil {
+ panic(err)
+ }
+
+ return copy.(*Diff)
+}
+
+func (d *Diff) String() string {
+ var buf bytes.Buffer
+
+ keys := make([]string, 0, len(d.Modules))
+ lookup := make(map[string]*ModuleDiff)
+ for _, m := range d.Modules {
+ key := fmt.Sprintf("module.%s", strings.Join(m.Path[1:], "."))
+ keys = append(keys, key)
+ lookup[key] = m
+ }
+ sort.Strings(keys)
+
+ for _, key := range keys {
+ m := lookup[key]
+ mStr := m.String()
+
+ // If we're the root module, we just write the output directly.
+ if reflect.DeepEqual(m.Path, rootModulePath) {
+ buf.WriteString(mStr + "\n")
+ continue
+ }
+
+ buf.WriteString(fmt.Sprintf("%s:\n", key))
+
+ s := bufio.NewScanner(strings.NewReader(mStr))
+ for s.Scan() {
+ buf.WriteString(fmt.Sprintf(" %s\n", s.Text()))
+ }
+ }
+
+ return strings.TrimSpace(buf.String())
+}
+
+func (d *Diff) init() {
+ if d.Modules == nil {
+ rootDiff := &ModuleDiff{Path: rootModulePath}
+ d.Modules = []*ModuleDiff{rootDiff}
+ }
+ for _, m := range d.Modules {
+ m.init()
+ }
+}
+
+// ModuleDiff tracks the differences between resources to apply within
+// a single module.
+type ModuleDiff struct {
+ Path []string
+ Resources map[string]*InstanceDiff
+ Destroy bool // Set only by the destroy plan
+}
+
+func (d *ModuleDiff) init() {
+ if d.Resources == nil {
+ d.Resources = make(map[string]*InstanceDiff)
+ }
+ for _, r := range d.Resources {
+ r.init()
+ }
+}
+
+// ChangeType returns the type of changes that the diff for this
+// module includes.
+//
+// At a module level, this will only be DiffNone, DiffUpdate, DiffDestroy, or
+// DiffCreate. If an instance within the module has a DiffDestroyCreate
+// then this will register as a DiffCreate for a module.
+func (d *ModuleDiff) ChangeType() DiffChangeType {
+ result := DiffNone
+ for _, r := range d.Resources {
+ change := r.ChangeType()
+ switch change {
+ case DiffCreate, DiffDestroy:
+ if result == DiffNone {
+ result = change
+ }
+ case DiffDestroyCreate, DiffUpdate:
+ result = DiffUpdate
+ }
+ }
+
+ return result
+}
+
+// Empty returns true if the diff has no changes within this module.
+func (d *ModuleDiff) Empty() bool {
+ if d.Destroy {
+ return false
+ }
+
+ if len(d.Resources) == 0 {
+ return true
+ }
+
+ for _, rd := range d.Resources {
+ if !rd.Empty() {
+ return false
+ }
+ }
+
+ return true
+}
+
+// Instances returns the instance diffs for the id given. This can return
+// multiple instance diffs if there are counts within the resource.
+func (d *ModuleDiff) Instances(id string) []*InstanceDiff {
+ var result []*InstanceDiff
+ for k, diff := range d.Resources {
+ if k == id || strings.HasPrefix(k, id+".") {
+ if !diff.Empty() {
+ result = append(result, diff)
+ }
+ }
+ }
+
+ return result
+}
+
+// IsRoot says whether or not this module diff is for the root module.
+func (d *ModuleDiff) IsRoot() bool {
+ return reflect.DeepEqual(d.Path, rootModulePath)
+}
+
+// String outputs the diff in a long but command-line friendly output
+// format that users can read to quickly inspect a diff.
+func (d *ModuleDiff) String() string {
+ var buf bytes.Buffer
+
+ names := make([]string, 0, len(d.Resources))
+ for name, _ := range d.Resources {
+ names = append(names, name)
+ }
+ sort.Strings(names)
+
+ for _, name := range names {
+ rdiff := d.Resources[name]
+
+ crud := "UPDATE"
+ switch {
+ case rdiff.RequiresNew() && (rdiff.GetDestroy() || rdiff.GetDestroyTainted()):
+ crud = "DESTROY/CREATE"
+ case rdiff.GetDestroy() || rdiff.GetDestroyDeposed():
+ crud = "DESTROY"
+ case rdiff.RequiresNew():
+ crud = "CREATE"
+ }
+
+ extra := ""
+ if !rdiff.GetDestroy() && rdiff.GetDestroyDeposed() {
+ extra = " (deposed only)"
+ }
+
+ buf.WriteString(fmt.Sprintf(
+ "%s: %s%s\n",
+ crud,
+ name,
+ extra))
+
+ keyLen := 0
+ rdiffAttrs := rdiff.CopyAttributes()
+ keys := make([]string, 0, len(rdiffAttrs))
+ for key, _ := range rdiffAttrs {
+ if key == "id" {
+ continue
+ }
+
+ keys = append(keys, key)
+ if len(key) > keyLen {
+ keyLen = len(key)
+ }
+ }
+ sort.Strings(keys)
+
+ for _, attrK := range keys {
+ attrDiff, _ := rdiff.GetAttribute(attrK)
+
+ v := attrDiff.New
+ u := attrDiff.Old
+ if attrDiff.NewComputed {
+ v = "<computed>"
+ }
+
+ if attrDiff.Sensitive {
+ u = "<sensitive>"
+ v = "<sensitive>"
+ }
+
+ updateMsg := ""
+ if attrDiff.RequiresNew {
+ updateMsg = " (forces new resource)"
+ } else if attrDiff.Sensitive {
+ updateMsg = " (attribute changed)"
+ }
+
+ buf.WriteString(fmt.Sprintf(
+ " %s:%s %#v => %#v%s\n",
+ attrK,
+ strings.Repeat(" ", keyLen-len(attrK)),
+ u,
+ v,
+ updateMsg))
+ }
+ }
+
+ return buf.String()
+}
+
+// InstanceDiff is the diff of a resource from some state to another.
+type InstanceDiff struct {
+ mu sync.Mutex
+ Attributes map[string]*ResourceAttrDiff
+ Destroy bool
+ DestroyDeposed bool
+ DestroyTainted bool
+
+ // Meta is a simple K/V map that is stored in a diff and persisted to
+ // plans but otherwise is completely ignored by Terraform core. It is
+ // mean to be used for additional data a resource may want to pass through.
+ // The value here must only contain Go primitives and collections.
+ Meta map[string]interface{}
+}
+
+func (d *InstanceDiff) Lock() { d.mu.Lock() }
+func (d *InstanceDiff) Unlock() { d.mu.Unlock() }
+
+// ResourceAttrDiff is the diff of a single attribute of a resource.
+type ResourceAttrDiff struct {
+ Old string // Old Value
+ New string // New Value
+ NewComputed bool // True if new value is computed (unknown currently)
+ NewRemoved bool // True if this attribute is being removed
+ NewExtra interface{} // Extra information for the provider
+ RequiresNew bool // True if change requires new resource
+ Sensitive bool // True if the data should not be displayed in UI output
+ Type DiffAttrType
+}
+
+// Empty returns true if the diff for this attr is neutral
+func (d *ResourceAttrDiff) Empty() bool {
+ return d.Old == d.New && !d.NewComputed && !d.NewRemoved
+}
+
+func (d *ResourceAttrDiff) GoString() string {
+ return fmt.Sprintf("*%#v", *d)
+}
+
+// DiffAttrType is an enum type that says whether a resource attribute
+// diff is an input attribute (comes from the configuration) or an
+// output attribute (comes as a result of applying the configuration). An
+// example input would be "ami" for AWS and an example output would be
+// "private_ip".
+type DiffAttrType byte
+
+const (
+ DiffAttrUnknown DiffAttrType = iota
+ DiffAttrInput
+ DiffAttrOutput
+)
+
+func (d *InstanceDiff) init() {
+ if d.Attributes == nil {
+ d.Attributes = make(map[string]*ResourceAttrDiff)
+ }
+}
+
+func NewInstanceDiff() *InstanceDiff {
+ return &InstanceDiff{Attributes: make(map[string]*ResourceAttrDiff)}
+}
+
+func (d *InstanceDiff) Copy() (*InstanceDiff, error) {
+ if d == nil {
+ return nil, nil
+ }
+
+ dCopy, err := copystructure.Config{Lock: true}.Copy(d)
+ if err != nil {
+ return nil, err
+ }
+
+ return dCopy.(*InstanceDiff), nil
+}
+
+// ChangeType returns the DiffChangeType represented by the diff
+// for this single instance.
+func (d *InstanceDiff) ChangeType() DiffChangeType {
+ if d.Empty() {
+ return DiffNone
+ }
+
+ if d.RequiresNew() && (d.GetDestroy() || d.GetDestroyTainted()) {
+ return DiffDestroyCreate
+ }
+
+ if d.GetDestroy() || d.GetDestroyDeposed() {
+ return DiffDestroy
+ }
+
+ if d.RequiresNew() {
+ return DiffCreate
+ }
+
+ return DiffUpdate
+}
+
+// Empty returns true if this diff encapsulates no changes.
+func (d *InstanceDiff) Empty() bool {
+ if d == nil {
+ return true
+ }
+
+ d.mu.Lock()
+ defer d.mu.Unlock()
+ return !d.Destroy &&
+ !d.DestroyTainted &&
+ !d.DestroyDeposed &&
+ len(d.Attributes) == 0
+}
+
+// Equal compares two diffs for exact equality.
+//
+// This is different from the Same comparison that is supported which
+// checks for operation equality taking into account computed values. Equal
+// instead checks for exact equality.
+func (d *InstanceDiff) Equal(d2 *InstanceDiff) bool {
+ // If one is nil, they must both be nil
+ if d == nil || d2 == nil {
+ return d == d2
+ }
+
+ // Use DeepEqual
+ return reflect.DeepEqual(d, d2)
+}
+
+// DeepCopy performs a deep copy of all parts of the InstanceDiff
+func (d *InstanceDiff) DeepCopy() *InstanceDiff {
+ copy, err := copystructure.Config{Lock: true}.Copy(d)
+ if err != nil {
+ panic(err)
+ }
+
+ return copy.(*InstanceDiff)
+}
+
+func (d *InstanceDiff) GoString() string {
+ return fmt.Sprintf("*%#v", InstanceDiff{
+ Attributes: d.Attributes,
+ Destroy: d.Destroy,
+ DestroyTainted: d.DestroyTainted,
+ DestroyDeposed: d.DestroyDeposed,
+ })
+}
+
+// RequiresNew returns true if the diff requires the creation of a new
+// resource (implying the destruction of the old).
+func (d *InstanceDiff) RequiresNew() bool {
+ if d == nil {
+ return false
+ }
+
+ d.mu.Lock()
+ defer d.mu.Unlock()
+
+ return d.requiresNew()
+}
+
+func (d *InstanceDiff) requiresNew() bool {
+ if d == nil {
+ return false
+ }
+
+ if d.DestroyTainted {
+ return true
+ }
+
+ for _, rd := range d.Attributes {
+ if rd != nil && rd.RequiresNew {
+ return true
+ }
+ }
+
+ return false
+}
+
+func (d *InstanceDiff) GetDestroyDeposed() bool {
+ d.mu.Lock()
+ defer d.mu.Unlock()
+
+ return d.DestroyDeposed
+}
+
+func (d *InstanceDiff) SetDestroyDeposed(b bool) {
+ d.mu.Lock()
+ defer d.mu.Unlock()
+
+ d.DestroyDeposed = b
+}
+
+// These methods are properly locked, for use outside other InstanceDiff
+// methods but everywhere else within in the terraform package.
+// TODO refactor the locking scheme
+func (d *InstanceDiff) SetTainted(b bool) {
+ d.mu.Lock()
+ defer d.mu.Unlock()
+
+ d.DestroyTainted = b
+}
+
+func (d *InstanceDiff) GetDestroyTainted() bool {
+ d.mu.Lock()
+ defer d.mu.Unlock()
+
+ return d.DestroyTainted
+}
+
+func (d *InstanceDiff) SetDestroy(b bool) {
+ d.mu.Lock()
+ defer d.mu.Unlock()
+
+ d.Destroy = b
+}
+
+func (d *InstanceDiff) GetDestroy() bool {
+ d.mu.Lock()
+ defer d.mu.Unlock()
+
+ return d.Destroy
+}
+
+func (d *InstanceDiff) SetAttribute(key string, attr *ResourceAttrDiff) {
+ d.mu.Lock()
+ defer d.mu.Unlock()
+
+ d.Attributes[key] = attr
+}
+
+func (d *InstanceDiff) DelAttribute(key string) {
+ d.mu.Lock()
+ defer d.mu.Unlock()
+
+ delete(d.Attributes, key)
+}
+
+func (d *InstanceDiff) GetAttribute(key string) (*ResourceAttrDiff, bool) {
+ d.mu.Lock()
+ defer d.mu.Unlock()
+
+ attr, ok := d.Attributes[key]
+ return attr, ok
+}
+func (d *InstanceDiff) GetAttributesLen() int {
+ d.mu.Lock()
+ defer d.mu.Unlock()
+
+ return len(d.Attributes)
+}
+
+// Safely copies the Attributes map
+func (d *InstanceDiff) CopyAttributes() map[string]*ResourceAttrDiff {
+ d.mu.Lock()
+ defer d.mu.Unlock()
+
+ attrs := make(map[string]*ResourceAttrDiff)
+ for k, v := range d.Attributes {
+ attrs[k] = v
+ }
+
+ return attrs
+}
+
+// Same checks whether or not two InstanceDiff's are the "same". When
+// we say "same", it is not necessarily exactly equal. Instead, it is
+// just checking that the same attributes are changing, a destroy
+// isn't suddenly happening, etc.
+func (d *InstanceDiff) Same(d2 *InstanceDiff) (bool, string) {
+ // we can safely compare the pointers without a lock
+ switch {
+ case d == nil && d2 == nil:
+ return true, ""
+ case d == nil || d2 == nil:
+ return false, "one nil"
+ case d == d2:
+ return true, ""
+ }
+
+ d.mu.Lock()
+ defer d.mu.Unlock()
+
+ // If we're going from requiring new to NOT requiring new, then we have
+ // to see if all required news were computed. If so, it is allowed since
+ // computed may also mean "same value and therefore not new".
+ oldNew := d.requiresNew()
+ newNew := d2.RequiresNew()
+ if oldNew && !newNew {
+ oldNew = false
+
+ // This section builds a list of ignorable attributes for requiresNew
+ // by removing off any elements of collections going to zero elements.
+ // For collections going to zero, they may not exist at all in the
+ // new diff (and hence RequiresNew == false).
+ ignoreAttrs := make(map[string]struct{})
+ for k, diffOld := range d.Attributes {
+ if !strings.HasSuffix(k, ".%") && !strings.HasSuffix(k, ".#") {
+ continue
+ }
+
+ // This case is in here as a protection measure. The bug that this
+ // code originally fixed (GH-11349) didn't have to deal with computed
+ // so I'm not 100% sure what the correct behavior is. Best to leave
+ // the old behavior.
+ if diffOld.NewComputed {
+ continue
+ }
+
+ // We're looking for the case a map goes to exactly 0.
+ if diffOld.New != "0" {
+ continue
+ }
+
+ // Found it! Ignore all of these. The prefix here is stripping
+ // off the "%" so it is just "k."
+ prefix := k[:len(k)-1]
+ for k2, _ := range d.Attributes {
+ if strings.HasPrefix(k2, prefix) {
+ ignoreAttrs[k2] = struct{}{}
+ }
+ }
+ }
+
+ for k, rd := range d.Attributes {
+ if _, ok := ignoreAttrs[k]; ok {
+ continue
+ }
+
+ // If the field is requires new and NOT computed, then what
+ // we have is a diff mismatch for sure. We set that the old
+ // diff does REQUIRE a ForceNew.
+ if rd != nil && rd.RequiresNew && !rd.NewComputed {
+ oldNew = true
+ break
+ }
+ }
+ }
+
+ if oldNew != newNew {
+ return false, fmt.Sprintf(
+ "diff RequiresNew; old: %t, new: %t", oldNew, newNew)
+ }
+
+ // Verify that destroy matches. The second boolean here allows us to
+ // have mismatching Destroy if we're moving from RequiresNew true
+ // to false above. Therefore, the second boolean will only pass if
+ // we're moving from Destroy: true to false as well.
+ if d.Destroy != d2.GetDestroy() && d.requiresNew() == oldNew {
+ return false, fmt.Sprintf(
+ "diff: Destroy; old: %t, new: %t", d.Destroy, d2.GetDestroy())
+ }
+
+ // Go through the old diff and make sure the new diff has all the
+ // same attributes. To start, build up the check map to be all the keys.
+ checkOld := make(map[string]struct{})
+ checkNew := make(map[string]struct{})
+ for k, _ := range d.Attributes {
+ checkOld[k] = struct{}{}
+ }
+ for k, _ := range d2.CopyAttributes() {
+ checkNew[k] = struct{}{}
+ }
+
+ // Make an ordered list so we are sure the approximated hashes are left
+ // to process at the end of the loop
+ keys := make([]string, 0, len(d.Attributes))
+ for k, _ := range d.Attributes {
+ keys = append(keys, k)
+ }
+ sort.StringSlice(keys).Sort()
+
+ for _, k := range keys {
+ diffOld := d.Attributes[k]
+
+ if _, ok := checkOld[k]; !ok {
+ // We're not checking this key for whatever reason (see where
+ // check is modified).
+ continue
+ }
+
+ // Remove this key since we'll never hit it again
+ delete(checkOld, k)
+ delete(checkNew, k)
+
+ _, ok := d2.GetAttribute(k)
+ if !ok {
+ // If there's no new attribute, and the old diff expected the attribute
+ // to be removed, that's just fine.
+ if diffOld.NewRemoved {
+ continue
+ }
+
+ // If the last diff was a computed value then the absense of
+ // that value is allowed since it may mean the value ended up
+ // being the same.
+ if diffOld.NewComputed {
+ ok = true
+ }
+
+ // No exact match, but maybe this is a set containing computed
+ // values. So check if there is an approximate hash in the key
+ // and if so, try to match the key.
+ if strings.Contains(k, "~") {
+ parts := strings.Split(k, ".")
+ parts2 := append([]string(nil), parts...)
+
+ re := regexp.MustCompile(`^~\d+$`)
+ for i, part := range parts {
+ if re.MatchString(part) {
+ // we're going to consider this the base of a
+ // computed hash, and remove all longer matching fields
+ ok = true
+
+ parts2[i] = `\d+`
+ parts2 = parts2[:i+1]
+ break
+ }
+ }
+
+ re, err := regexp.Compile("^" + strings.Join(parts2, `\.`))
+ if err != nil {
+ return false, fmt.Sprintf("regexp failed to compile; err: %#v", err)
+ }
+
+ for k2, _ := range checkNew {
+ if re.MatchString(k2) {
+ delete(checkNew, k2)
+ }
+ }
+ }
+
+ // This is a little tricky, but when a diff contains a computed
+ // list, set, or map that can only be interpolated after the apply
+ // command has created the dependent resources, it could turn out
+ // that the result is actually the same as the existing state which
+ // would remove the key from the diff.
+ if diffOld.NewComputed && (strings.HasSuffix(k, ".#") || strings.HasSuffix(k, ".%")) {
+ ok = true
+ }
+
+ // Similarly, in a RequiresNew scenario, a list that shows up in the plan
+ // diff can disappear from the apply diff, which is calculated from an
+ // empty state.
+ if d.requiresNew() && (strings.HasSuffix(k, ".#") || strings.HasSuffix(k, ".%")) {
+ ok = true
+ }
+
+ if !ok {
+ return false, fmt.Sprintf("attribute mismatch: %s", k)
+ }
+ }
+
+ // search for the suffix of the base of a [computed] map, list or set.
+ match := multiVal.FindStringSubmatch(k)
+
+ if diffOld.NewComputed && len(match) == 2 {
+ matchLen := len(match[1])
+
+ // This is a computed list, set, or map, so remove any keys with
+ // this prefix from the check list.
+ kprefix := k[:len(k)-matchLen]
+ for k2, _ := range checkOld {
+ if strings.HasPrefix(k2, kprefix) {
+ delete(checkOld, k2)
+ }
+ }
+ for k2, _ := range checkNew {
+ if strings.HasPrefix(k2, kprefix) {
+ delete(checkNew, k2)
+ }
+ }
+ }
+
+ // TODO: check for the same value if not computed
+ }
+
+ // Check for leftover attributes
+ if len(checkNew) > 0 {
+ extras := make([]string, 0, len(checkNew))
+ for attr, _ := range checkNew {
+ extras = append(extras, attr)
+ }
+ return false,
+ fmt.Sprintf("extra attributes: %s", strings.Join(extras, ", "))
+ }
+
+ return true, ""
+}
+
+// moduleDiffSort implements sort.Interface to sort module diffs by path.
+type moduleDiffSort []*ModuleDiff
+
+func (s moduleDiffSort) Len() int { return len(s) }
+func (s moduleDiffSort) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
+func (s moduleDiffSort) Less(i, j int) bool {
+ a := s[i]
+ b := s[j]
+
+ // If the lengths are different, then the shorter one always wins
+ if len(a.Path) != len(b.Path) {
+ return len(a.Path) < len(b.Path)
+ }
+
+ // Otherwise, compare lexically
+ return strings.Join(a.Path, ".") < strings.Join(b.Path, ".")
+}
projects / github / fretlink / terraform-provider-statuscake.git / blobdiff