refact(deps): bump k8s and client-go deps to version v0.20.2 (#294)

Signed-off-by: prateekpandey14 <prateek.pandey@mayadata.io>

vendor/k8s.io/gengo/parser/parse.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"go/ast"
 	"go/build"
+	"go/constant"
 	"go/parser"
 	"go/token"
 	tc "go/types"
@@ -28,11 +29,12 @@ import (
 	"os/exec"
 	"path"
 	"path/filepath"
+	"regexp"
 	"sort"
 	"strings"
 
 	"k8s.io/gengo/types"
-	"k8s.io/klog"
+	"k8s.io/klog/v2"
 )
 
 // This clarifies when a pkg path has been canonicalized.
@@ -227,12 +229,16 @@ func (b *Builder) AddDirRecursive(dir string) error {
 		klog.Warningf("Ignoring directory %v: %v", dir, err)
 	}
 
-	// filepath.Walk includes the root dir, but we already did that, so we'll
-	// remove that prefix and rebuild a package import path.
-	prefix := b.buildPackages[dir].Dir
+	// filepath.Walk does not follow symlinks. We therefore evaluate symlinks and use that with
+	// filepath.Walk.
+	realPath, err := filepath.EvalSymlinks(b.buildPackages[dir].Dir)
+	if err != nil {
+		return err
+	}
+
 	fn := func(filePath string, info os.FileInfo, err error) error {
 		if info != nil && info.IsDir() {
-			rel := filepath.ToSlash(strings.TrimPrefix(filePath, prefix))
+			rel := filepath.ToSlash(strings.TrimPrefix(filePath, realPath))
 			if rel != "" {
 				// Make a pkg path.
 				pkg := path.Join(string(canonicalizeImportPath(b.buildPackages[dir].ImportPath)), rel)
@@ -245,7 +251,7 @@ func (b *Builder) AddDirRecursive(dir string) error {
 		}
 		return nil
 	}
-	if err := filepath.Walk(b.buildPackages[dir].Dir, fn); err != nil {
+	if err := filepath.Walk(realPath, fn); err != nil {
 		return err
 	}
 	return nil
@@ -330,6 +336,13 @@ func (b *Builder) addDir(dir string, userRequested bool) error {
 	return nil
 }
 
+// regexErrPackageNotFound helps test the expected error for not finding a package.
+var regexErrPackageNotFound = regexp.MustCompile(`^unable to import ".*?":.*`)
+
+func isErrPackageNotFound(err error) bool {
+	return regexErrPackageNotFound.MatchString(err.Error())
+}
+
 // importPackage is a function that will be called by the type check package when it
 // needs to import a go package. 'path' is the import path.
 func (b *Builder) importPackage(dir string, userRequested bool) (*tc.Package, error) {
@@ -352,6 +365,11 @@ func (b *Builder) importPackage(dir string, userRequested bool) (*tc.Package, er
 
 		// Add it.
 		if err := b.addDir(dir, userRequested); err != nil {
+			if isErrPackageNotFound(err) {
+				klog.V(6).Info(err)
+				return nil, nil
+			}
+
 			return nil, err
 		}
 
@@ -544,6 +562,10 @@ func (b *Builder) findTypesIn(pkgPath importPathString, u *types.Universe) error
 		if ok && !tv.IsField() {
 			b.addVariable(*u, nil, tv)
 		}
+		tconst, ok := obj.(*tc.Const)
+		if ok {
+			b.addConstant(*u, nil, tconst)
+		}
 	}
 
 	importedPkgs := []string{}
@@ -569,7 +591,7 @@ func (b *Builder) importWithMode(dir string, mode build.ImportMode) (*build.Pack
 	if err != nil {
 		return nil, fmt.Errorf("unable to get current directory: %v", err)
 	}
-	buildPkg, err := b.context.Import(dir, cwd, mode)
+	buildPkg, err := b.context.Import(filepath.ToSlash(dir), cwd, mode)
 	if err != nil {
 		return nil, err
 	}
@@ -742,7 +764,11 @@ func (b *Builder) walkType(u types.Universe, useName *types.Name, in tc.Type) *t
 			if out.Methods == nil {
 				out.Methods = map[string]*types.Type{}
 			}
-			out.Methods[t.Method(i).Name()] = b.walkType(u, nil, t.Method(i).Type())
+			method := t.Method(i)
+			name := tcNameToName(method.String())
+			mt := b.walkType(u, &name, method.Type())
+			mt.CommentLines = splitLines(b.priorCommentLines(method.Pos(), 1).Text())
+			out.Methods[method.Name()] = mt
 		}
 		return out
 	case *tc.Named:
@@ -774,7 +800,11 @@ func (b *Builder) walkType(u types.Universe, useName *types.Name, in tc.Type) *t
 				if out.Methods == nil {
 					out.Methods = map[string]*types.Type{}
 				}
-				out.Methods[t.Method(i).Name()] = b.walkType(u, nil, t.Method(i).Type())
+				method := t.Method(i)
+				name := tcNameToName(method.String())
+				mt := b.walkType(u, &name, method.Type())
+				mt.CommentLines = splitLines(b.priorCommentLines(method.Pos(), 1).Text())
+				out.Methods[method.Name()] = mt
 			}
 		}
 		return out
@@ -811,6 +841,33 @@ func (b *Builder) addVariable(u types.Universe, useName *types.Name, in *tc.Var)
 	return out
 }
 
+func (b *Builder) addConstant(u types.Universe, useName *types.Name, in *tc.Const) *types.Type {
+	name := tcVarNameToName(in.String())
+	if useName != nil {
+		name = *useName
+	}
+	out := u.Constant(name)
+	out.Kind = types.DeclarationOf
+	out.Underlying = b.walkType(u, nil, in.Type())
+
+	var constval string
+
+	// For strings, we use `StringVal()` to get the un-truncated,
+	// un-quoted string. For other values, `.String()` is preferable to
+	// get something relatively human readable (especially since for
+	// floating point types, `ExactString()` will generate numeric
+	// expressions using `big.(*Float).Text()`.
+	switch in.Val().Kind() {
+	case constant.String:
+		constval = constant.StringVal(in.Val())
+	default:
+		constval = in.Val().String()
+	}
+
+	out.ConstValue = &constval
+	return out
+}
+
 // canonicalizeImportPath takes an import path and returns the actual package.
 // It doesn't support nested vendoring.
 func canonicalizeImportPath(importPath string) importPathString {