Allow setting ulimits for containers

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

opts/opts.go

@@ -11,6 +11,7 @@ import (
 	"github.com/docker/docker/api"
 	flag "github.com/docker/docker/pkg/mflag"
 	"github.com/docker/docker/pkg/parsers"
+	"github.com/docker/docker/pkg/ulimit"
 	"github.com/docker/docker/utils"
 )
 
@@ -43,6 +44,10 @@ func LabelListVar(values *[]string, names []string, usage string) {
 	flag.Var(newListOptsRef(values, ValidateLabel), names, usage)
 }
 
+func UlimitMapVar(values map[string]*ulimit.Ulimit, names []string, usage string) {
+	flag.Var(NewUlimitOpt(values), names, usage)
+}
+
 // ListOpts type
 type ListOpts struct {
 	values    *[]string

opts/ulimit.go

@@ -0,0 +1,44 @@
+package opts
+
+import (
+	"fmt"
+
+	"github.com/docker/docker/pkg/ulimit"
+)
+
+type UlimitOpt struct {
+	values map[string]*ulimit.Ulimit
+}
+
+func NewUlimitOpt(ref map[string]*ulimit.Ulimit) *UlimitOpt {
+	return &UlimitOpt{ref}
+}
+
+func (o *UlimitOpt) Set(val string) error {
+	l, err := ulimit.Parse(val)
+	if err != nil {
+		return err
+	}
+
+	o.values[l.Name] = l
+
+	return nil
+}
+
+func (o *UlimitOpt) String() string {
+	var out []string
+	for _, v := range o.values {
+		out = append(out, v.String())
+	}
+
+	return fmt.Sprintf("%v", out)
+}
+
+func (o *UlimitOpt) GetList() []*ulimit.Ulimit {
+	var ulimits []*ulimit.Ulimit
+	for _, v := range o.values {
+		ulimits = append(ulimits, v)
+	}
+
+	return ulimits
+}