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compare: implement mtree.DirectoryHierarchy comparisons

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This is part of a patchset that refactors all of the checking logic into
comparison operations. Essentially, provide a Compare(...) function that
allows for two different manifests to be compared. Extra and missing
entries are supported in addition to the standard modified entry, and by
implementing as a manifest comparison there is no double-scanning of the
manifest source.

The main annoyance is that we have to also include tar_time handling,
which has not been abstracted inside keywords.go. This is a bit ugly
right now, but works fine for the moment.

Signed-off-by: Aleksa Sarai <asarai@suse.de>
This commit is contained in:
Aleksa Sarai 2016-07-27 22:05:15 +10:00
parent 36372dd3c8
commit 26ff922da6
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3 changed files with 776 additions and 0 deletions
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9
keywords.go
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@ -78,6 +78,15 @@ func (kv KeyVal) ChangeValue(newval string) string {
return fmt.Sprintf("%s=%s", kv.Keyword(), newval)
}
// KeyValEqual returns whether two KeyVals are equivalent. This takes
// care of certain odd cases such as tar_mtime, and should be used over
// using == comparisons directly unless you really know what you're
// doing.
func KeyValEqual(a, b KeyVal) bool {
// TODO: Implement handling of tar_mtime.
return a.Keyword() == b.Keyword() && a.Value() == b.Value()
}
// keywordSelector takes an array of "keyword=value" and filters out that only the set of words
func keywordSelector(keyval, words []string) []string {
retList := []string{}