Fix missing vendor dir

vendor/github.com/shirou/gopsutil/mem/mem_bsd.go

@@ -0,0 +1,91 @@
+// +build freebsd openbsd
+
+package mem
+
+import (
+	"context"
+	"fmt"
+	"os/exec"
+	"strconv"
+	"strings"
+)
+
+const swapCommand = "swapctl"
+
+// swapctl column indexes
+const (
+	nameCol     = 0
+	totalKiBCol = 1
+	usedKiBCol  = 2
+)
+
+func SwapDevices() ([]*SwapDevice, error) {
+	return SwapDevicesWithContext(context.Background())
+}
+
+func SwapDevicesWithContext(ctx context.Context) ([]*SwapDevice, error) {
+	swapCommandPath, err := exec.LookPath(swapCommand)
+	if err != nil {
+		return nil, fmt.Errorf("could not find command %q: %w", swapCommand, err)
+	}
+	output, err := invoke.CommandWithContext(ctx, swapCommandPath, "-lk")
+	if err != nil {
+		return nil, fmt.Errorf("could not execute %q: %w", swapCommand, err)
+	}
+
+	return parseSwapctlOutput(string(output))
+}
+
+func parseSwapctlOutput(output string) ([]*SwapDevice, error) {
+	lines := strings.Split(output, "\n")
+	if len(lines) == 0 {
+		return nil, fmt.Errorf("could not parse output of %q: no lines in %q", swapCommand, output)
+	}
+
+	// Check header headerFields are as expected.
+	header := lines[0]
+	header = strings.ToLower(header)
+	header = strings.ReplaceAll(header, ":", "")
+	headerFields := strings.Fields(header)
+	if len(headerFields) < usedKiBCol {
+		return nil, fmt.Errorf("couldn't parse %q: too few fields in header %q", swapCommand, header)
+	}
+	if headerFields[nameCol] != "device" {
+		return nil, fmt.Errorf("couldn't parse %q: expected %q to be %q", swapCommand, headerFields[nameCol], "device")
+	}
+	if headerFields[totalKiBCol] != "1kb-blocks" && headerFields[totalKiBCol] != "1k-blocks" {
+		return nil, fmt.Errorf("couldn't parse %q: expected %q to be %q", swapCommand, headerFields[totalKiBCol], "1kb-blocks")
+	}
+	if headerFields[usedKiBCol] != "used" {
+		return nil, fmt.Errorf("couldn't parse %q: expected %q to be %q", swapCommand, headerFields[usedKiBCol], "used")
+	}
+
+	var swapDevices []*SwapDevice
+	for _, line := range lines[1:] {
+		if line == "" {
+			continue // the terminal line is typically empty
+		}
+		fields := strings.Fields(line)
+		if len(fields) < usedKiBCol {
+			return nil, fmt.Errorf("couldn't parse %q: too few fields", swapCommand)
+		}
+
+		totalKiB, err := strconv.ParseUint(fields[totalKiBCol], 10, 64)
+		if err != nil {
+			return nil, fmt.Errorf("couldn't parse 'Size' column in %q: %w", swapCommand, err)
+		}
+
+		usedKiB, err := strconv.ParseUint(fields[usedKiBCol], 10, 64)
+		if err != nil {
+			return nil, fmt.Errorf("couldn't parse 'Used' column in %q: %w", swapCommand, err)
+		}
+
+		swapDevices = append(swapDevices, &SwapDevice{
+			Name:      fields[nameCol],
+			UsedBytes: usedKiB * 1024,
+			FreeBytes: (totalKiB - usedKiB) * 1024,
+		})
+	}
+
+	return swapDevices, nil
+}