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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2022 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package cgroup_test
import (
"os"
"path/filepath"
. "gopkg.in/check.v1"
"github.com/snapcore/snapd/dirs"
"github.com/snapcore/snapd/sandbox/cgroup"
"github.com/snapcore/snapd/testutil"
)
type memorySuiteBase struct {
testutil.BaseTest
rootDir string
mockCgroupsFile string
}
type memoryCgroupV1Suite struct {
memorySuiteBase
}
type memoryCgroupV2Suite struct {
memorySuiteBase
}
var _ = Suite(&memoryCgroupV1Suite{})
var _ = Suite(&memoryCgroupV2Suite{})
var (
cgroupContentCommon = `#subsys_name hierarchy num_cgroups enabled
cpuset 6 3 1
cpu 3 133 1
devices 10 135 1`
)
func (s *memorySuiteBase) SetUpTest(c *C) {
s.BaseTest.SetUpTest(c)
s.rootDir = c.MkDir()
dirs.SetRootDir(s.rootDir)
s.AddCleanup(func() { dirs.SetRootDir("/") })
s.AddCleanup(cgroup.MockVersion(cgroup.V1, nil))
s.mockCgroupsFile = filepath.Join(s.rootDir, "/proc/cgroups")
c.Assert(os.MkdirAll(filepath.Dir(s.mockCgroupsFile), 0755), IsNil)
c.Assert(os.MkdirAll(filepath.Join(s.rootDir, "/sys/fs/cgroup"), 0755), IsNil)
}
func (s *memoryCgroupV1Suite) SetUpTest(c *C) {
s.memorySuiteBase.SetUpTest(c)
s.AddCleanup(cgroup.MockVersion(cgroup.V1, nil))
}
func (s *memoryCgroupV1Suite) TestCheckMemoryCgroupV1_Happy(c *C) {
extra := "memory 2 223 1"
content := cgroupContentCommon + "\n" + extra
err := os.WriteFile(s.mockCgroupsFile, []byte(content), 0644)
c.Assert(err, IsNil)
err = cgroup.CheckMemoryCgroup()
c.Assert(err, IsNil)
}
func (s *memoryCgroupV1Suite) TestCheckMemoryCgroupV1_Missing(c *C) {
// note there is no file created for s.mockCgroupsFile
err := cgroup.CheckMemoryCgroup()
c.Assert(err, ErrorMatches, "cannot open cgroups file: open .*/cgroups: no such file or directory")
}
func (s *memoryCgroupV1Suite) TestCheckMemoryCgroupV1_NoMemoryEntry(c *C) {
content := cgroupContentCommon
err := os.WriteFile(s.mockCgroupsFile, []byte(content), 0644)
c.Assert(err, IsNil)
err = cgroup.CheckMemoryCgroup()
c.Assert(err, ErrorMatches, "cgroup memory controller is disabled on this system")
}
func (s *memoryCgroupV1Suite) TestCheckMemoryCgroupV1_InvalidMemoryEntry(c *C) {
extra := "memory invalid line"
content := cgroupContentCommon + "\n" + extra
err := os.WriteFile(s.mockCgroupsFile, []byte(content), 0644)
c.Assert(err, IsNil)
err = cgroup.CheckMemoryCgroup()
c.Assert(err, ErrorMatches, `cannot parse cgroups file: invalid line "memory\\tinvalid line"`)
}
func (s *memoryCgroupV1Suite) TestCheckMemoryCgroupV1_Disabled(c *C) {
extra := "memory 2 223 0"
content := cgroupContentCommon + "\n" + extra
err := os.WriteFile(s.mockCgroupsFile, []byte(content), 0644)
c.Assert(err, IsNil)
err = cgroup.CheckMemoryCgroup()
c.Assert(err, ErrorMatches, "cgroup memory controller is disabled on this system")
}
func (s *memoryCgroupV2Suite) SetUpTest(c *C) {
s.memorySuiteBase.SetUpTest(c)
s.AddCleanup(cgroup.MockVersion(cgroup.V2, nil))
}
func (s *memoryCgroupV2Suite) TestCheckMemoryCgroupV2_Disabled(c *C) {
defer cgroup.MockVersion(cgroup.V2, nil)()
content := cgroupContentCommon + "\n"
// memory not mentioned in /proc/cgroups at all (like on 6.12+ kernels)
err := os.WriteFile(s.mockCgroupsFile, []byte(content), 0644)
c.Assert(err, IsNil)
v2ControllersFile := filepath.Join(s.rootDir, "/sys/fs/cgroup/cgroup.controllers")
// no memory
c.Assert(os.WriteFile(v2ControllersFile, []byte("foo bar baz other\n"), 0644), IsNil)
err = cgroup.CheckMemoryCgroup()
c.Assert(err, ErrorMatches, "cgroup memory controller is disabled on this system")
}
func (s *memoryCgroupV2Suite) TestCheckMemoryCgroupV2_Happy(c *C) {
defer cgroup.MockVersion(cgroup.V2, nil)()
content := cgroupContentCommon + "\n"
// memory not mentioned in /proc/cgroups at all (like on 6.12+ kernels)
err := os.WriteFile(s.mockCgroupsFile, []byte(content), 0644)
c.Assert(err, IsNil)
v2ControllersFile := filepath.Join(s.rootDir, "/sys/fs/cgroup/cgroup.controllers")
c.Assert(os.WriteFile(v2ControllersFile, []byte("foo bar baz memory other\n"), 0644), IsNil)
err = cgroup.CheckMemoryCgroup()
c.Assert(err, IsNil)
}
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