Update vendor

vendor/github.com/mattermost/logr/v2/pkg.go

@@ -0,0 +1,57 @@
+package logr
+
+import (
+	"runtime"
+	"strings"
+	"sync"
+)
+
+const (
+	maximumStackDepth int = 30
+)
+
+var (
+	logrPkg     string
+	pkgCalcOnce sync.Once
+)
+
+// GetPackageName returns the root package name of Logr.
+func GetLogrPackageName() string {
+	pkgCalcOnce.Do(func() {
+		logrPkg = GetPackageName("GetLogrPackageName")
+	})
+	return logrPkg
+}
+
+// GetPackageName returns the package name of the caller.
+// `callingFuncName` should be the name of the calling function and
+// should be unique enough not to collide with any runtime methods.
+func GetPackageName(callingFuncName string) string {
+	var pkgName string
+
+	pcs := make([]uintptr, maximumStackDepth)
+	_ = runtime.Callers(0, pcs)
+
+	for _, pc := range pcs {
+		funcName := runtime.FuncForPC(pc).Name()
+		if strings.Contains(funcName, callingFuncName) {
+			pkgName = ResolvePackageName(funcName)
+			break
+		}
+	}
+	return pkgName
+}
+
+// ResolvePackageName reduces a fully qualified function name to the package name
+func ResolvePackageName(f string) string {
+	for {
+		lastPeriod := strings.LastIndex(f, ".")
+		lastSlash := strings.LastIndex(f, "/")
+		if lastPeriod > lastSlash {
+			f = f[:lastPeriod]
+		} else {
+			break
+		}
+	}
+	return f
+}