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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2019 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 main_test
import (
"bytes"
"context"
"os"
"path/filepath"
. "gopkg.in/check.v1"
update "github.com/snapcore/snapd/cmd/snap-update-ns"
"github.com/snapcore/snapd/dirs"
"github.com/snapcore/snapd/osutil"
"github.com/snapcore/snapd/osutil/sys"
"github.com/snapcore/snapd/sandbox/cgroup"
)
type systemSuite struct{}
var _ = Suite(&systemSuite{})
func (s *systemSuite) TestLockCgroup(c *C) {
dirs.SetRootDir(c.MkDir())
defer dirs.SetRootDir("/")
restore := cgroup.MockVersion(cgroup.V1, nil)
defer restore()
var frozen []string
var thawed []string
happyFreeze := func(ctx context.Context, snapName string) error {
frozen = append(frozen, snapName)
return nil
}
happyThaw := func(snapName string) error {
thawed = append(thawed, snapName)
return nil
}
cgroup.MockFreezing(happyFreeze, happyThaw)
upCtx := update.NewSystemProfileUpdateContext("foo", false)
unlock, err := upCtx.Lock()
c.Assert(err, IsNil)
c.Check(unlock, NotNil)
c.Check(frozen, DeepEquals, []string{"foo"})
c.Check(thawed, HasLen, 0)
unlock()
c.Check(frozen, DeepEquals, []string{"foo"})
c.Check(thawed, DeepEquals, []string{"foo"})
}
func (s *systemSuite) TestAssumptions(c *C) {
// Non-instances can access /tmp, /var/snap and /snap/$SNAP_NAME
upCtx := update.NewSystemProfileUpdateContext("foo", false)
as := upCtx.Assumptions()
c.Check(as.UnrestrictedPaths(), DeepEquals, []string{"/tmp", "/var/snap", "/snap/foo", "/dev/shm", "/run/systemd", "/var/lib/snapd/hostfs/tmp"})
c.Check(as.ModeForPath("/stuff"), Equals, os.FileMode(0755))
c.Check(as.ModeForPath("/tmp"), Equals, os.FileMode(0755))
c.Check(as.ModeForPath("/var/lib/snapd/hostfs/tmp"), Equals, os.FileMode(0755))
c.Check(as.ModeForPath("/var/lib/snapd/hostfs/tmp/snap-private-tmp/snap.x11-server"), Equals, os.FileMode(0700))
c.Check(as.ModeForPath("/var/lib/snapd/hostfs/tmp/snap-private-tmp/snap.x11-server/tmp"), Equals, os.FileMode(0777)|os.ModeSticky)
c.Check(as.ModeForPath("/var/lib/snapd/hostfs/tmp/snap-private-tmp/snap.x11-server/foo"), Equals, os.FileMode(0755))
c.Check(as.ModeForPath("/var/lib/snapd/hostfs/tmp/snap-private-tmp/snap.x11-server/tmp/.X11-unix"), Equals, os.FileMode(0777)|os.ModeSticky)
c.Check(as.ModeForPath("/dev/shm/snap.some-snap"), Equals, os.FileMode(0777)|os.ModeSticky)
// Instances can, in addition, access /snap/$SNAP_INSTANCE_NAME
upCtx = update.NewSystemProfileUpdateContext("foo_instance", false)
as = upCtx.Assumptions()
c.Check(as.UnrestrictedPaths(), DeepEquals, []string{"/tmp", "/var/snap", "/snap/foo_instance", "/dev/shm", "/run/systemd", "/snap/foo", "/var/lib/snapd/hostfs/tmp"})
}
func (s *systemSuite) TestLoadDesiredProfile(c *C) {
// Mock directories.
dirs.SetRootDir(c.MkDir())
defer dirs.SetRootDir("/")
upCtx := update.NewSystemProfileUpdateContext("foo", false)
text := "/snap/foo/42/dir /snap/bar/13/dir none bind,rw 0 0\n"
// Write a desired system mount profile for snap "foo".
path := update.DesiredSystemProfilePath(upCtx.InstanceName())
c.Assert(os.MkdirAll(filepath.Dir(path), 0755), IsNil)
c.Assert(os.WriteFile(path, []byte(text), 0644), IsNil)
// Ask the system profile update helper to read the desired profile.
profile, err := upCtx.LoadDesiredProfile()
c.Assert(err, IsNil)
builder := &bytes.Buffer{}
profile.WriteTo(builder)
c.Check(builder.String(), Equals, text)
}
func (s *systemSuite) TestLoadCurrentProfile(c *C) {
// Mock directories.
dirs.SetRootDir(c.MkDir())
defer dirs.SetRootDir("/")
upCtx := update.NewSystemProfileUpdateContext("foo", false)
text := "/snap/foo/42/dir /snap/bar/13/dir none bind,rw 0 0\n"
// Write a current system mount profile for snap "foo".
path := update.CurrentSystemProfilePath(upCtx.InstanceName())
c.Assert(os.MkdirAll(filepath.Dir(path), 0755), IsNil)
c.Assert(os.WriteFile(path, []byte(text), 0644), IsNil)
// Ask the system profile update helper to read the current profile.
profile, err := upCtx.LoadCurrentProfile()
c.Assert(err, IsNil)
builder := &bytes.Buffer{}
profile.WriteTo(builder)
// The profile is returned unchanged.
c.Check(builder.String(), Equals, text)
}
func (s *systemSuite) TestSaveCurrentProfile(c *C) {
// Mock directories and create directory for runtime mount profiles.
dirs.SetRootDir(c.MkDir())
defer dirs.SetRootDir("/")
c.Assert(os.MkdirAll(dirs.SnapRunNsDir, 0755), IsNil)
upCtx := update.NewSystemProfileUpdateContext("foo", false)
text := "/snap/foo/42/dir /snap/bar/13/dir none bind,rw 0 0\n"
// Prepare a mount profile to be saved.
profile, err := osutil.LoadMountProfileText(text)
c.Assert(err, IsNil)
// Ask the system profile update to write the current profile.
var profilePath string
var savedProfile string
restore := update.MockSaveMountProfile(func(p *osutil.MountProfile, fname string, uid sys.UserID, gid sys.GroupID) (err error) {
profilePath = fname
savedProfile, err = osutil.SaveMountProfileText(p)
return err
})
defer restore()
c.Assert(upCtx.SaveCurrentProfile(profile), IsNil)
c.Check(profilePath, Equals, update.CurrentSystemProfilePath(upCtx.InstanceName()))
c.Check(savedProfile, Equals, text)
}
func (s *systemSuite) TestDesiredSystemProfilePath(c *C) {
c.Check(update.DesiredSystemProfilePath("foo"), Equals, "/var/lib/snapd/mount/snap.foo.fstab")
}
func (s *systemSuite) TestCurrentSystemProfilePath(c *C) {
c.Check(update.CurrentSystemProfilePath("foo"), Equals, "/run/snapd/ns/snap.foo.fstab")
}
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