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moby--moby/pkg/sysinfo/sysinfo.go
Eric Rafaloff 3716df57c0 Update inline doc for New
Signed-off-by: Eric Rafaloff <erafaloff@gmail.com>
2015-03-27 13:55:22 -04:00

49 lines
1.4 KiB
Go

package sysinfo
import (
"io/ioutil"
"os"
"path"
"github.com/Sirupsen/logrus"
"github.com/docker/libcontainer/cgroups"
)
// SysInfo stores information about which features a kernel supports.
type SysInfo struct {
MemoryLimit bool
SwapLimit bool
IPv4ForwardingDisabled bool
AppArmor bool
}
// New returns a new SysInfo, using the filesystem to detect which features the kernel supports.
func New(quiet bool) *SysInfo {
sysInfo := &SysInfo{}
if cgroupMemoryMountpoint, err := cgroups.FindCgroupMountpoint("memory"); err != nil {
if !quiet {
logrus.Warnf("%s", err)
}
} else {
_, err1 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.limit_in_bytes"))
_, err2 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.soft_limit_in_bytes"))
sysInfo.MemoryLimit = err1 == nil && err2 == nil
if !sysInfo.MemoryLimit && !quiet {
logrus.Warnf("Your kernel does not support cgroup memory limit.")
}
_, err = ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.memsw.limit_in_bytes"))
sysInfo.SwapLimit = err == nil
if !sysInfo.SwapLimit && !quiet {
logrus.Warnf("Your kernel does not support cgroup swap limit.")
}
}
// Check if AppArmor is supported.
if _, err := os.Stat("/sys/kernel/security/apparmor"); os.IsNotExist(err) {
sysInfo.AppArmor = false
} else {
sysInfo.AppArmor = true
}
return sysInfo
}