build: move e2e dependencies into e2e/go.mod

Several packages are only used while running the e2e suite. These
packages are less important to update, as the they can not influence the
final executable that is part of the Ceph-CSI container-image.

By moving these dependencies out of the main Ceph-CSI go.mod, it is
easier to identify if a reported CVE affects Ceph-CSI, or only the
testing (like most of the Kubernetes CVEs).

Signed-off-by: Niels de Vos <ndevos@ibm.com>

e2e/vendor/github.com/karrick/godirwalk/readdir_unix.go

@@ -0,0 +1,131 @@
+// +build !windows
+
+package godirwalk
+
+import (
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+// MinimumScratchBufferSize specifies the minimum size of the scratch buffer
+// that ReadDirents, ReadDirnames, Scanner, and Walk will use when reading file
+// entries from the operating system. During program startup it is initialized
+// to the result from calling `os.Getpagesize()` for non Windows environments,
+// and 0 for Windows.
+var MinimumScratchBufferSize = os.Getpagesize()
+
+func newScratchBuffer() []byte { return make([]byte, MinimumScratchBufferSize) }
+
+func readDirents(osDirname string, scratchBuffer []byte) ([]*Dirent, error) {
+	var entries []*Dirent
+	var workBuffer []byte
+
+	dh, err := os.Open(osDirname)
+	if err != nil {
+		return nil, err
+	}
+	fd := int(dh.Fd())
+
+	if len(scratchBuffer) < MinimumScratchBufferSize {
+		scratchBuffer = newScratchBuffer()
+	}
+
+	var sde syscall.Dirent
+	for {
+		if len(workBuffer) == 0 {
+			n, err := syscall.ReadDirent(fd, scratchBuffer)
+			// n, err := unix.ReadDirent(fd, scratchBuffer)
+			if err != nil {
+				if err == syscall.EINTR /* || err == unix.EINTR */ {
+					continue
+				}
+				_ = dh.Close()
+				return nil, err
+			}
+			if n <= 0 { // end of directory: normal exit
+				if err = dh.Close(); err != nil {
+					return nil, err
+				}
+				return entries, nil
+			}
+			workBuffer = scratchBuffer[:n] // trim work buffer to number of bytes read
+		}
+
+		copy((*[unsafe.Sizeof(syscall.Dirent{})]byte)(unsafe.Pointer(&sde))[:], workBuffer)
+		workBuffer = workBuffer[reclen(&sde):] // advance buffer for next iteration through loop
+
+		if inoFromDirent(&sde) == 0 {
+			continue // inode set to 0 indicates an entry that was marked as deleted
+		}
+
+		nameSlice := nameFromDirent(&sde)
+		nameLength := len(nameSlice)
+
+		if nameLength == 0 || (nameSlice[0] == '.' && (nameLength == 1 || (nameLength == 2 && nameSlice[1] == '.'))) {
+			continue
+		}
+
+		childName := string(nameSlice)
+		mt, err := modeTypeFromDirent(&sde, osDirname, childName)
+		if err != nil {
+			_ = dh.Close()
+			return nil, err
+		}
+		entries = append(entries, &Dirent{name: childName, path: osDirname, modeType: mt})
+	}
+}
+
+func readDirnames(osDirname string, scratchBuffer []byte) ([]string, error) {
+	var entries []string
+	var workBuffer []byte
+	var sde *syscall.Dirent
+
+	dh, err := os.Open(osDirname)
+	if err != nil {
+		return nil, err
+	}
+	fd := int(dh.Fd())
+
+	if len(scratchBuffer) < MinimumScratchBufferSize {
+		scratchBuffer = newScratchBuffer()
+	}
+
+	for {
+		if len(workBuffer) == 0 {
+			n, err := syscall.ReadDirent(fd, scratchBuffer)
+			// n, err := unix.ReadDirent(fd, scratchBuffer)
+			if err != nil {
+				if err == syscall.EINTR /* || err == unix.EINTR */ {
+					continue
+				}
+				_ = dh.Close()
+				return nil, err
+			}
+			if n <= 0 { // end of directory: normal exit
+				if err = dh.Close(); err != nil {
+					return nil, err
+				}
+				return entries, nil
+			}
+			workBuffer = scratchBuffer[:n] // trim work buffer to number of bytes read
+		}
+
+		sde = (*syscall.Dirent)(unsafe.Pointer(&workBuffer[0])) // point entry to first syscall.Dirent in buffer
+		// Handle first entry in the work buffer.
+		workBuffer = workBuffer[reclen(sde):] // advance buffer for next iteration through loop
+
+		if inoFromDirent(sde) == 0 {
+			continue // inode set to 0 indicates an entry that was marked as deleted
+		}
+
+		nameSlice := nameFromDirent(sde)
+		nameLength := len(nameSlice)
+
+		if nameLength == 0 || (nameSlice[0] == '.' && (nameLength == 1 || (nameLength == 2 && nameSlice[1] == '.'))) {
+			continue
+		}
+
+		entries = append(entries, string(nameSlice))
+	}
+}