104 lines
2.5 KiB
Diff
104 lines
2.5 KiB
Diff
From 5fb0f19ec8c52ed0c9bbb3551deb0016992ecc52 Mon Sep 17 00:00:00 2001
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From: Giuseppe Scrivano <gscrivan@redhat.com>
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Date: Thu, 3 Oct 2019 15:58:39 +0200
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Subject: [PATCH] cgroups: raise an error on cgroups v2
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Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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---
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create.go | 8 ++++++++
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run.go | 8 ++++++++
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utils_linux.go | 14 ++++++++++++++
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3 files changed, 30 insertions(+)
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diff --git a/create.go b/create.go
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index 5f3ac609..91d17d07 100644
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--- a/create.go
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+++ b/create.go
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@@ -1,6 +1,7 @@
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package main
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import (
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+ "fmt"
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"os"
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"github.com/urfave/cli"
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@@ -52,6 +53,13 @@ command(s) that get executed on start, edit the args parameter of the spec. See
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},
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},
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Action: func(context *cli.Context) error {
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+ unified, err := IsCgroup2UnifiedMode()
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+ if err != nil {
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+ return err
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+ }
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+ if unified {
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+ return fmt.Errorf("this version of runc doesn't work on cgroups v2")
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+ }
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if err := checkArgs(context, 1, exactArgs); err != nil {
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return err
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}
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diff --git a/run.go b/run.go
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index f8d63178..3f29737b 100644
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--- a/run.go
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+++ b/run.go
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@@ -3,6 +3,7 @@
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package main
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import (
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+ "fmt"
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"os"
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"github.com/urfave/cli"
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@@ -63,6 +64,13 @@ command(s) that get executed on start, edit the args parameter of the spec. See
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},
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},
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Action: func(context *cli.Context) error {
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+ unified, err := IsCgroup2UnifiedMode()
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+ if err != nil {
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+ return err
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+ }
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+ if unified {
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+ return fmt.Errorf("this version of runc doesn't work on cgroups v2")
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+ }
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if err := checkArgs(context, 1, exactArgs); err != nil {
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return err
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}
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diff --git a/utils_linux.go b/utils_linux.go
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index 984e6b0f..a5a03de9 100644
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--- a/utils_linux.go
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+++ b/utils_linux.go
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@@ -9,6 +9,7 @@ import (
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"os/exec"
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"path/filepath"
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"strconv"
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+ "syscall"
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"github.com/opencontainers/runc/libcontainer"
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"github.com/opencontainers/runc/libcontainer/cgroups/systemd"
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@@ -26,6 +27,10 @@ import (
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"golang.org/x/sys/unix"
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)
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+const (
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+ _cgroup2SuperMagic = 0x63677270
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+)
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+
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var errEmptyID = errors.New("container id cannot be empty")
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// loadFactory returns the configured factory instance for execing containers.
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@@ -451,3 +456,12 @@ func startContainer(context *cli.Context, spec *specs.Spec, action CtAct, criuOp
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}
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return r.run(spec.Process)
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}
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+
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+// IsCgroup2UnifiedMode returns whether we are running in cgroup 2 cgroup2 mode.
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+func IsCgroup2UnifiedMode() (bool, error) {
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+ var st syscall.Statfs_t
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+ if err := syscall.Statfs("/sys/fs/cgroup", &st); err != nil {
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+ return false, err
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+ }
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+ return st.Type == _cgroup2SuperMagic, nil
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+}
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--
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2.21.0
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