mirror of
https://github.com/linuxkit/linuxkit.git
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065af9707c
Generated largely from the specified config; small parts taken from `docker image inspect`, such as the command line. Renamed some of the yaml keys to match the OCI spec rather than Docker Compose as we decided they are more readable, no more underscores. Add some extra functionality - tmpfs specification - fully general mount specification - no new privileges can be specified now For nostalgic reasons, using engine-api to talk to the docker cli as we only need an old API version, and it is nice and easy to vendor... Signed-off-by: Justin Cormack <justin.cormack@docker.com>
110 lines
2.8 KiB
Go
110 lines
2.8 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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limitVals := strings.SplitN(parts[1], ":", 2)
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if len(limitVals) > 2 {
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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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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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hard := soft // in case no hard was set
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if len(limitVals) == 2 {
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hard, err = strconv.ParseInt(limitVals[1], 10, 64)
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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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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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