1 files changed, 145 insertions, 0 deletions
diff --git a/vendor/github.com/opencontainers/runc/libcontainer/cgroups/fscommon/utils.go b/vendor/github.com/opencontainers/runc/libcontainer/cgroups/fscommon/utils.go
new file mode 100644
index 000000000..f4a51c9e5
--- /dev/null
+++ b/vendor/github.com/opencontainers/runc/libcontainer/cgroups/fscommon/utils.go
@@ -0,0 +1,145 @@
+package fscommon
+
+import (
+	"errors"
+	"fmt"
+	"math"
+	"path"
+	"strconv"
+	"strings"
+
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+)
+
+var (
+	// Deprecated: use cgroups.OpenFile instead.
+	OpenFile = cgroups.OpenFile
+	// Deprecated: use cgroups.ReadFile instead.
+	ReadFile = cgroups.ReadFile
+	// Deprecated: use cgroups.WriteFile instead.
+	WriteFile = cgroups.WriteFile
+)
+
+// ParseError records a parse error details, including the file path.
+type ParseError struct {
+	Path string
+	File string
+	Err  error
+}
+
+func (e *ParseError) Error() string {
+	return "unable to parse " + path.Join(e.Path, e.File) + ": " + e.Err.Error()
+}
+
+func (e *ParseError) Unwrap() error { return e.Err }
+
+// ParseUint converts a string to an uint64 integer.
+// Negative values are returned at zero as, due to kernel bugs,
+// some of the memory cgroup stats can be negative.
+func ParseUint(s string, base, bitSize int) (uint64, error) {
+	value, err := strconv.ParseUint(s, base, bitSize)
+	if err != nil {
+		intValue, intErr := strconv.ParseInt(s, base, bitSize)
+		// 1. Handle negative values greater than MinInt64 (and)
+		// 2. Handle negative values lesser than MinInt64
+		if intErr == nil && intValue < 0 {
+			return 0, nil
+		} else if errors.Is(intErr, strconv.ErrRange) && intValue < 0 {
+			return 0, nil
+		}
+
+		return value, err
+	}
+
+	return value, nil
+}
+
+// ParseKeyValue parses a space-separated "name value" kind of cgroup
+// parameter and returns its key as a string, and its value as uint64
+// (ParseUint is used to convert the value). For example,
+// "io_service_bytes 1234" will be returned as "io_service_bytes", 1234.
+func ParseKeyValue(t string) (string, uint64, error) {
+	parts := strings.SplitN(t, " ", 3)
+	if len(parts) != 2 {
+		return "", 0, fmt.Errorf("line %q is not in key value format", t)
+	}
+
+	value, err := ParseUint(parts[1], 10, 64)
+	if err != nil {
+		return "", 0, err
+	}
+
+	return parts[0], value, nil
+}
+
+// GetValueByKey reads a key-value pairs from the specified cgroup file,
+// and returns a value of the specified key. ParseUint is used for value
+// conversion.
+func GetValueByKey(path, file, key string) (uint64, error) {
+	content, err := cgroups.ReadFile(path, file)
+	if err != nil {
+		return 0, err
+	}
+
+	lines := strings.Split(content, "\n")
+	for _, line := range lines {
+		arr := strings.Split(line, " ")
+		if len(arr) == 2 && arr[0] == key {
+			val, err := ParseUint(arr[1], 10, 64)
+			if err != nil {
+				err = &ParseError{Path: path, File: file, Err: err}
+			}
+			return val, err
+		}
+	}
+
+	return 0, nil
+}
+
+// GetCgroupParamUint reads a single uint64 value from the specified cgroup file.
+// If the value read is "max", the math.MaxUint64 is returned.
+func GetCgroupParamUint(path, file string) (uint64, error) {
+	contents, err := GetCgroupParamString(path, file)
+	if err != nil {
+		return 0, err
+	}
+	contents = strings.TrimSpace(contents)
+	if contents == "max" {
+		return math.MaxUint64, nil
+	}
+
+	res, err := ParseUint(contents, 10, 64)
+	if err != nil {
+		return res, &ParseError{Path: path, File: file, Err: err}
+	}
+	return res, nil
+}
+
+// GetCgroupParamInt reads a single int64 value from specified cgroup file.
+// If the value read is "max", the math.MaxInt64 is returned.
+func GetCgroupParamInt(path, file string) (int64, error) {
+	contents, err := cgroups.ReadFile(path, file)
+	if err != nil {
+		return 0, err
+	}
+	contents = strings.TrimSpace(contents)
+	if contents == "max" {
+		return math.MaxInt64, nil
+	}
+
+	res, err := strconv.ParseInt(contents, 10, 64)
+	if err != nil {
+		return res, &ParseError{Path: path, File: file, Err: err}
+	}
+	return res, nil
+}
+
+// GetCgroupParamString reads a string from the specified cgroup file.
+func GetCgroupParamString(path, file string) (string, error) {
+	contents, err := cgroups.ReadFile(path, file)
+	if err != nil {
+		return "", err
+	}
+
+	return strings.TrimSpace(contents), nil
+}