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compare: allow nil newDh and oldDh

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This allows people to create synthetic InodeDeltas, which is something
that umoci would like to be able to do in order to nicely create 'umoci
insert' layers.

Signed-off-by: Aleksa Sarai <asarai@suse.de>
This commit is contained in:
Aleksa Sarai 2018-05-16 19:53:28 +10:00
parent ffb4a05860
commit be3abf053a
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GPG key ID: 9E18AA267DDB8DB4
1 changed files with 36 additions and 28 deletions
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12
compare.go
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@ -325,6 +325,10 @@ func compareEntry(oldEntry, newEntry Entry) ([]KeyDelta, error) {
// missing entries and the like). A missing or extra key is treated as a
// Modified type.
//
// If oldDh or newDh are empty, we assume they are a hierarchy that is
// completely empty. This is purely for helping callers create synthetic
// InodeDeltas.
//
// NB: The order of the parameters matters (old, new) because Extra and
// Missing are considered as different discrepancy types.
func Compare(oldDh, newDh *DirectoryHierarchy, keys []Keyword) ([]InodeDelta, error) {
@ -338,7 +342,8 @@ func Compare(oldDh, newDh *DirectoryHierarchy, keys []Keyword) ([]InodeDelta, er
// map to make sure we don't start comparing unrelated entries.
diffs := map[string]*stateT{}
// First, iterate over the old hierarchy.
// First, iterate over the old hierarchy. If nil, pretend it's empty.
if oldDh != nil {
for _, e := range oldDh.Entries {
if e.Type == RelativeType || e.Type == FullType {
path, err := e.Path()
@ -357,8 +362,10 @@ func Compare(oldDh, newDh *DirectoryHierarchy, keys []Keyword) ([]InodeDelta, er
diffs[path].Old = copy
}
}
}
// Then, iterate over the new hierarchy.
// Then, iterate over the new hierarchy. If nil, pretend it's empty.
if newDh != nil {
for _, e := range newDh.Entries {
if e.Type == RelativeType || e.Type == FullType {
path, err := e.Path()
@ -377,6 +384,7 @@ func Compare(oldDh, newDh *DirectoryHierarchy, keys []Keyword) ([]InodeDelta, er
diffs[path].New = copy
}
}
}
// Now we compute the diff.
var results []InodeDelta