From c23d7367a7e55548dd01b916368a052b072ee0bb Mon Sep 17 00:00:00 2001
From: "Guillaume J. Charmes" <guillaume.charmes@docker.com>
Date: Wed, 15 Jan 2014 14:36:13 -0800
Subject: [PATCH] Rename Capabilities in sysinfo and move it to its own
 subpackage

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume.charmes@docker.com> (github: creack)

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume.charmes@docker.com> (github: crosbymichael)
---
 sysinfo/sysinfo.go | 55 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 sysinfo/sysinfo.go

diff --git a/sysinfo/sysinfo.go b/sysinfo/sysinfo.go
new file mode 100644
index 0000000..884fcbd
--- /dev/null
+++ b/sysinfo/sysinfo.go
@@ -0,0 +1,55 @@
+package sysinfo
+
+import (
+	"github.com/dotcloud/docker/cgroups"
+	"github.com/dotcloud/docker/utils"
+	"io/ioutil"
+	"log"
+	"os"
+	"path"
+)
+
+type SysInfo struct {
+	MemoryLimit            bool
+	SwapLimit              bool
+	IPv4ForwardingDisabled bool
+	AppArmor               bool
+}
+
+func New(quiet bool) *SysInfo {
+	sysInfo := &SysInfo{}
+	if cgroupMemoryMountpoint, err := cgroups.FindCgroupMountpoint("memory"); err != nil {
+		if !quiet {
+			log.Printf("WARNING: %s\n", 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 {
+			log.Printf("WARNING: 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 {
+			log.Printf("WARNING: Your kernel does not support cgroup swap limit.")
+		}
+	}
+
+	content, err3 := ioutil.ReadFile("/proc/sys/net/ipv4/ip_forward")
+	sysInfo.IPv4ForwardingDisabled = err3 != nil || len(content) == 0 || content[0] != '1'
+	if sysInfo.IPv4ForwardingDisabled && !quiet {
+		log.Printf("WARNING: IPv4 forwarding is disabled.")
+	}
+
+	// Check if AppArmor seems to be enabled on this system.
+	if _, err := os.Stat("/sys/kernel/security/apparmor"); os.IsNotExist(err) {
+		utils.Debugf("/sys/kernel/security/apparmor not found; assuming AppArmor is not enabled.")
+		sysInfo.AppArmor = false
+	} else {
+		utils.Debugf("/sys/kernel/security/apparmor found; assuming AppArmor is enabled.")
+		sysInfo.AppArmor = true
+	}
+	return sysInfo
+}