435c0d9fc8
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
124 lines
3.1 KiB
Go
124 lines
3.1 KiB
Go
package units
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import (
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"fmt"
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"strconv"
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"strings"
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)
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// Ulimit is a human friendly version of Rlimit.
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type Ulimit struct {
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Name string
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Hard int64
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Soft int64
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}
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// Rlimit specifies the resource limits, such as max open files.
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type Rlimit struct {
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Type int `json:"type,omitempty"`
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Hard uint64 `json:"hard,omitempty"`
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Soft uint64 `json:"soft,omitempty"`
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}
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const (
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// magic numbers for making the syscall
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// some of these are defined in the syscall package, but not all.
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// Also since Windows client doesn't get access to the syscall package, need to
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// define these here
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rlimitAs = 9
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rlimitCore = 4
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rlimitCPU = 0
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rlimitData = 2
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rlimitFsize = 1
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rlimitLocks = 10
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rlimitMemlock = 8
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rlimitMsgqueue = 12
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rlimitNice = 13
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rlimitNofile = 7
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rlimitNproc = 6
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rlimitRss = 5
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rlimitRtprio = 14
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rlimitRttime = 15
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rlimitSigpending = 11
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rlimitStack = 3
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)
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var ulimitNameMapping = map[string]int{
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//"as": rlimitAs, // Disabled since this doesn't seem usable with the way Docker inits a container.
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"core": rlimitCore,
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"cpu": rlimitCPU,
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"data": rlimitData,
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"fsize": rlimitFsize,
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"locks": rlimitLocks,
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"memlock": rlimitMemlock,
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"msgqueue": rlimitMsgqueue,
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"nice": rlimitNice,
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"nofile": rlimitNofile,
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"nproc": rlimitNproc,
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"rss": rlimitRss,
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"rtprio": rlimitRtprio,
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"rttime": rlimitRttime,
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"sigpending": rlimitSigpending,
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"stack": rlimitStack,
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}
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// ParseUlimit parses and returns a Ulimit from the specified string.
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func ParseUlimit(val string) (*Ulimit, error) {
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parts := strings.SplitN(val, "=", 2)
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if len(parts) != 2 {
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return nil, fmt.Errorf("invalid ulimit argument: %s", val)
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}
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if _, exists := ulimitNameMapping[parts[0]]; !exists {
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return nil, fmt.Errorf("invalid ulimit type: %s", parts[0])
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}
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var (
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soft int64
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hard = &soft // default to soft in case no hard was set
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temp int64
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err error
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)
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switch limitVals := strings.Split(parts[1], ":"); len(limitVals) {
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case 2:
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temp, err = strconv.ParseInt(limitVals[1], 10, 64)
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if err != nil {
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return nil, err
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}
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hard = &temp
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fallthrough
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case 1:
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soft, err = strconv.ParseInt(limitVals[0], 10, 64)
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if err != nil {
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return nil, err
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}
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default:
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return nil, fmt.Errorf("too many limit value arguments - %s, can only have up to two, `soft[:hard]`", parts[1])
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}
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if *hard != -1 {
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if soft == -1 {
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return nil, fmt.Errorf("ulimit soft limit must be less than or equal to hard limit: soft: -1 (unlimited), hard: %d", *hard)
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}
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if soft > *hard {
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return nil, fmt.Errorf("ulimit soft limit must be less than or equal to hard limit: %d > %d", soft, *hard)
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}
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}
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return &Ulimit{Name: parts[0], Soft: soft, Hard: *hard}, nil
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}
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// GetRlimit returns the RLimit corresponding to Ulimit.
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func (u *Ulimit) GetRlimit() (*Rlimit, error) {
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t, exists := ulimitNameMapping[u.Name]
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if !exists {
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return nil, fmt.Errorf("invalid ulimit name %s", u.Name)
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}
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return &Rlimit{Type: t, Soft: uint64(u.Soft), Hard: uint64(u.Hard)}, nil
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}
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func (u *Ulimit) String() string {
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return fmt.Sprintf("%s=%d:%d", u.Name, u.Soft, u.Hard)
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}
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