mirror of https://github.com/k3s-io/k3s
124 lines
3.1 KiB
Go
124 lines
3.1 KiB
Go
package units
|
|
|
|
import (
|
|
"fmt"
|
|
"strconv"
|
|
"strings"
|
|
)
|
|
|
|
// Ulimit is a human friendly version of Rlimit.
|
|
type Ulimit struct {
|
|
Name string
|
|
Hard int64
|
|
Soft int64
|
|
}
|
|
|
|
// Rlimit specifies the resource limits, such as max open files.
|
|
type Rlimit struct {
|
|
Type int `json:"type,omitempty"`
|
|
Hard uint64 `json:"hard,omitempty"`
|
|
Soft uint64 `json:"soft,omitempty"`
|
|
}
|
|
|
|
const (
|
|
// magic numbers for making the syscall
|
|
// some of these are defined in the syscall package, but not all.
|
|
// Also since Windows client doesn't get access to the syscall package, need to
|
|
// define these here
|
|
rlimitAs = 9
|
|
rlimitCore = 4
|
|
rlimitCPU = 0
|
|
rlimitData = 2
|
|
rlimitFsize = 1
|
|
rlimitLocks = 10
|
|
rlimitMemlock = 8
|
|
rlimitMsgqueue = 12
|
|
rlimitNice = 13
|
|
rlimitNofile = 7
|
|
rlimitNproc = 6
|
|
rlimitRss = 5
|
|
rlimitRtprio = 14
|
|
rlimitRttime = 15
|
|
rlimitSigpending = 11
|
|
rlimitStack = 3
|
|
)
|
|
|
|
var ulimitNameMapping = map[string]int{
|
|
//"as": rlimitAs, // Disabled since this doesn't seem usable with the way Docker inits a container.
|
|
"core": rlimitCore,
|
|
"cpu": rlimitCPU,
|
|
"data": rlimitData,
|
|
"fsize": rlimitFsize,
|
|
"locks": rlimitLocks,
|
|
"memlock": rlimitMemlock,
|
|
"msgqueue": rlimitMsgqueue,
|
|
"nice": rlimitNice,
|
|
"nofile": rlimitNofile,
|
|
"nproc": rlimitNproc,
|
|
"rss": rlimitRss,
|
|
"rtprio": rlimitRtprio,
|
|
"rttime": rlimitRttime,
|
|
"sigpending": rlimitSigpending,
|
|
"stack": rlimitStack,
|
|
}
|
|
|
|
// ParseUlimit parses and returns a Ulimit from the specified string.
|
|
func ParseUlimit(val string) (*Ulimit, error) {
|
|
parts := strings.SplitN(val, "=", 2)
|
|
if len(parts) != 2 {
|
|
return nil, fmt.Errorf("invalid ulimit argument: %s", val)
|
|
}
|
|
|
|
if _, exists := ulimitNameMapping[parts[0]]; !exists {
|
|
return nil, fmt.Errorf("invalid ulimit type: %s", parts[0])
|
|
}
|
|
|
|
var (
|
|
soft int64
|
|
hard = &soft // default to soft in case no hard was set
|
|
temp int64
|
|
err error
|
|
)
|
|
switch limitVals := strings.Split(parts[1], ":"); len(limitVals) {
|
|
case 2:
|
|
temp, err = strconv.ParseInt(limitVals[1], 10, 64)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
hard = &temp
|
|
fallthrough
|
|
case 1:
|
|
soft, err = strconv.ParseInt(limitVals[0], 10, 64)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
default:
|
|
return nil, fmt.Errorf("too many limit value arguments - %s, can only have up to two, `soft[:hard]`", parts[1])
|
|
}
|
|
|
|
if *hard != -1 {
|
|
if soft == -1 {
|
|
return nil, fmt.Errorf("ulimit soft limit must be less than or equal to hard limit: soft: -1 (unlimited), hard: %d", *hard)
|
|
}
|
|
if soft > *hard {
|
|
return nil, fmt.Errorf("ulimit soft limit must be less than or equal to hard limit: %d > %d", soft, *hard)
|
|
}
|
|
}
|
|
|
|
return &Ulimit{Name: parts[0], Soft: soft, Hard: *hard}, nil
|
|
}
|
|
|
|
// GetRlimit returns the RLimit corresponding to Ulimit.
|
|
func (u *Ulimit) GetRlimit() (*Rlimit, error) {
|
|
t, exists := ulimitNameMapping[u.Name]
|
|
if !exists {
|
|
return nil, fmt.Errorf("invalid ulimit name %s", u.Name)
|
|
}
|
|
|
|
return &Rlimit{Type: t, Soft: uint64(u.Soft), Hard: uint64(u.Hard)}, nil
|
|
}
|
|
|
|
func (u *Ulimit) String() string {
|
|
return fmt.Sprintf("%s=%d:%d", u.Name, u.Soft, u.Hard)
|
|
}
|