Fix missing vendor dir

vendor/github.com/tklauser/numcpus/numcpus_linux.go

@@ -0,0 +1,188 @@
+// Copyright 2018 Tobias Klauser
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package numcpus
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	"golang.org/x/sys/unix"
+)
+
+const (
+	sysfsCPUBasePath = "/sys/devices/system/cpu"
+
+	offline  = "offline"
+	online   = "online"
+	possible = "possible"
+	present  = "present"
+)
+
+func getFromCPUAffinity() (int, error) {
+	var cpuSet unix.CPUSet
+	if err := unix.SchedGetaffinity(0, &cpuSet); err != nil {
+		return 0, err
+	}
+	return cpuSet.Count(), nil
+}
+
+func readCPURangeWith[T any](file string, f func(cpus string) (T, error)) (T, error) {
+	var zero T
+	buf, err := os.ReadFile(filepath.Join(sysfsCPUBasePath, file))
+	if err != nil {
+		return zero, err
+	}
+	return f(strings.Trim(string(buf), "\n "))
+}
+
+func countCPURange(cpus string) (int, error) {
+	// Treat empty file as valid. This might be the case if there are no offline CPUs in which
+	// case /sys/devices/system/cpu/offline is empty.
+	if cpus == "" {
+		return 0, nil
+	}
+
+	n := int(0)
+	for _, cpuRange := range strings.Split(cpus, ",") {
+		if cpuRange == "" {
+			return 0, fmt.Errorf("empty CPU range in CPU string %q", cpus)
+		}
+		from, to, found := strings.Cut(cpuRange, "-")
+		first, err := strconv.ParseUint(from, 10, 32)
+		if err != nil {
+			return 0, err
+		}
+		if !found {
+			n++
+			continue
+		}
+		last, err := strconv.ParseUint(to, 10, 32)
+		if err != nil {
+			return 0, err
+		}
+		if last < first {
+			return 0, fmt.Errorf("last CPU in range (%d) less than first (%d)", last, first)
+		}
+		n += int(last - first + 1)
+	}
+	return n, nil
+}
+
+func listCPURange(cpus string) ([]int, error) {
+	// See comment in countCPURange.
+	if cpus == "" {
+		return []int{}, nil
+	}
+
+	list := []int{}
+	for _, cpuRange := range strings.Split(cpus, ",") {
+		if cpuRange == "" {
+			return nil, fmt.Errorf("empty CPU range in CPU string %q", cpus)
+		}
+		from, to, found := strings.Cut(cpuRange, "-")
+		first, err := strconv.ParseUint(from, 10, 32)
+		if err != nil {
+			return nil, err
+		}
+		if !found {
+			// range containing a single element
+			list = append(list, int(first))
+			continue
+		}
+		last, err := strconv.ParseUint(to, 10, 32)
+		if err != nil {
+			return nil, err
+		}
+		if last < first {
+			return nil, fmt.Errorf("last CPU in range (%d) less than first (%d)", last, first)
+		}
+		for cpu := int(first); cpu <= int(last); cpu++ {
+			list = append(list, cpu)
+		}
+	}
+	return list, nil
+}
+
+func getConfigured() (int, error) {
+	d, err := os.Open(sysfsCPUBasePath)
+	if err != nil {
+		return 0, err
+	}
+	defer d.Close()
+	fis, err := d.Readdir(-1)
+	if err != nil {
+		return 0, err
+	}
+	count := 0
+	for _, fi := range fis {
+		if name := fi.Name(); fi.IsDir() && strings.HasPrefix(name, "cpu") {
+			_, err := strconv.ParseInt(name[3:], 10, 64)
+			if err == nil {
+				count++
+			}
+		}
+	}
+	return count, nil
+}
+
+func getKernelMax() (int, error) {
+	buf, err := os.ReadFile(filepath.Join(sysfsCPUBasePath, "kernel_max"))
+	if err != nil {
+		return 0, err
+	}
+	n, err := strconv.ParseInt(strings.Trim(string(buf), "\n "), 10, 32)
+	if err != nil {
+		return 0, err
+	}
+	return int(n), nil
+}
+
+func getOffline() (int, error) {
+	return readCPURangeWith(offline, countCPURange)
+}
+
+func getOnline() (int, error) {
+	if n, err := getFromCPUAffinity(); err == nil {
+		return n, nil
+	}
+	return readCPURangeWith(online, countCPURange)
+}
+
+func getPossible() (int, error) {
+	return readCPURangeWith(possible, countCPURange)
+}
+
+func getPresent() (int, error) {
+	return readCPURangeWith(present, countCPURange)
+}
+
+func listOffline() ([]int, error) {
+	return readCPURangeWith(offline, listCPURange)
+}
+
+func listOnline() ([]int, error) {
+	return readCPURangeWith(online, listCPURange)
+}
+
+func listPossible() ([]int, error) {
+	return readCPURangeWith(possible, listCPURange)
+}
+
+func listPresent() ([]int, error) {
+	return readCPURangeWith(present, listCPURange)
+}