github.com/bugraaydogar/snapd@v0.0.0-20210315170335-8c70bb858939/sandbox/cgroup/process_test.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2020 Canonical Ltd
     5   *
     6   * This program is free software: you can redistribute it and/or modify
     7   * it under the terms of the GNU General Public License version 3 as
     8   * published by the Free Software Foundation.
     9   *
    10   * This program is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU General Public License for more details.
    14   *
    15   * You should have received a copy of the GNU General Public License
    16   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17   *
    18   */
    19  
    20  package cgroup_test
    21  
    22  import (
    23  	"io/ioutil"
    24  	"os"
    25  	"path/filepath"
    26  
    27  	. "gopkg.in/check.v1"
    28  
    29  	"github.com/snapcore/snapd/sandbox/cgroup"
    30  )
    31  
    32  func (s *cgroupSuite) mockPidCgroup(c *C, text string) int {
    33  	f := filepath.Join(s.rootDir, "proc/333/cgroup")
    34  	c.Assert(os.MkdirAll(filepath.Dir(f), 0755), IsNil)
    35  	c.Assert(ioutil.WriteFile(f, []byte(text), 0755), IsNil)
    36  	return 333
    37  }
    38  
    39  func (s *cgroupSuite) TestV1SnapNameFromPidHappy(c *C) {
    40  	restore := cgroup.MockVersion(cgroup.V1, nil)
    41  	defer restore()
    42  	pid := s.mockPidCgroup(c, string(mockCgroup)) // defined in cgroup_test.go
    43  	name, err := cgroup.SnapNameFromPid(pid)
    44  	c.Assert(err, IsNil)
    45  	c.Check(name, Equals, "hello-world")
    46  }
    47  
    48  func (s *cgroupSuite) TestV1SnapNameFromPidUnhappy(c *C) {
    49  	restore := cgroup.MockVersion(cgroup.V1, nil)
    50  	defer restore()
    51  	pid := s.mockPidCgroup(c, "1:freezer:/\n")
    52  	name, err := cgroup.SnapNameFromPid(pid)
    53  	c.Assert(err, ErrorMatches, "cannot find a snap for pid .*")
    54  	c.Check(name, Equals, "")
    55  }
    56  
    57  func (s *cgroupSuite) TestV1SnapNameFromPidEmptyName(c *C) {
    58  	restore := cgroup.MockVersion(cgroup.V1, nil)
    59  	defer restore()
    60  	pid := s.mockPidCgroup(c, "1:freezer:/snap./\n")
    61  	name, err := cgroup.SnapNameFromPid(pid)
    62  	c.Assert(err, ErrorMatches, "snap name in cgroup path is empty")
    63  	c.Check(name, Equals, "")
    64  }
    65  
    66  func (s *cgroupSuite) TestSnapNameFromPidTracking(c *C) {
    67  	pid := s.mockPidCgroup(c, "1:name=systemd:/user.slice/user-1000.slice/user@1000.service/apps.slice/snap.foo.bar.00000-1111-3333.service\n")
    68  	name, err := cgroup.SnapNameFromPid(pid)
    69  	c.Assert(err, IsNil)
    70  	c.Check(name, Equals, "foo")
    71  }
    72  
    73  func (s *cgroupSuite) TestSnapNameFromPidWithoutSources(c *C) {
    74  	restore := cgroup.MockVersion(cgroup.V2, nil)
    75  	defer restore()
    76  
    77  	pid := s.mockPidCgroup(c, "")
    78  	name, err := cgroup.SnapNameFromPid(pid)
    79  	c.Assert(err, ErrorMatches, "not supported")
    80  	c.Check(name, Equals, "")
    81  }