1 files changed, 31 insertions, 0 deletions
diff --git a/registry-scanner/pkg/tag/semver.go b/registry-scanner/pkg/tag/semver.go
new file mode 100644
index 0000000..d722b80
--- /dev/null
+++ b/registry-scanner/pkg/tag/semver.go
@@ -0,0 +1,31 @@
+package tag
+
+import "github.com/Masterminds/semver/v3"
+
+// semverCollection is a replacement for semver.Collection that breaks version
+// comparison ties through a lexical comparison of the original version strings.
+// Using this, instead of semver.Collection, when sorting will yield
+// deterministic results that semver.Collection will not yield.
+type semverCollection []*semver.Version
+
+// Len returns the length of a collection. The number of Version instances
+// on the slice.
+func (s semverCollection) Len() int {
+	return len(s)
+}
+
+// Less is needed for the sort interface to compare two Version objects on the
+// slice. If checks if one is less than the other.
+func (s semverCollection) Less(i, j int) bool {
+	comp := s[i].Compare(s[j])
+	if comp != 0 {
+		return comp < 0
+	}
+	return s[i].Original() < s[j].Original()
+}
+
+// Swap is needed for the sort interface to replace the Version objects
+// at two different positions in the slice.
+func (s semverCollection) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}