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services_test.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2014-2021 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 wrappers_test
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"runtime"
"sort"
"strings"
"time"
. "gopkg.in/check.v1"
"github.com/snapcore/snapd/dirs"
"github.com/snapcore/snapd/gadget/quantity"
// imported to ensure actual interfaces are defined (in production this is guaranteed by ifacestate)
_ "github.com/snapcore/snapd/interfaces/builtin"
"github.com/snapcore/snapd/osutil"
"github.com/snapcore/snapd/progress"
"github.com/snapcore/snapd/snap"
"github.com/snapcore/snapd/snap/quota"
"github.com/snapcore/snapd/snap/snaptest"
"github.com/snapcore/snapd/strutil"
"github.com/snapcore/snapd/systemd"
"github.com/snapcore/snapd/systemd/systemdtest"
"github.com/snapcore/snapd/testutil"
"github.com/snapcore/snapd/timings"
"github.com/snapcore/snapd/usersession/agent"
"github.com/snapcore/snapd/wrappers"
)
type servicesTestSuite struct {
testutil.DBusTest
tempdir string
sysdLog [][]string
systemctlRestorer, delaysRestorer func()
perfTimings timings.Measurer
agent *agent.SessionAgent
}
var _ = Suite(&servicesTestSuite{})
func (s *servicesTestSuite) SetUpTest(c *C) {
s.DBusTest.SetUpTest(c)
s.tempdir = c.MkDir()
s.sysdLog = nil
dirs.SetRootDir(s.tempdir)
s.systemctlRestorer = systemd.MockSystemctl(func(cmd ...string) ([]byte, error) {
s.sysdLog = append(s.sysdLog, cmd)
return []byte("ActiveState=inactive\n"), nil
})
s.delaysRestorer = systemd.MockStopDelays(time.Millisecond, 25*time.Second)
s.perfTimings = timings.New(nil)
xdgRuntimeDir := fmt.Sprintf("%s/%d", dirs.XdgRuntimeDirBase, os.Getuid())
err := os.MkdirAll(xdgRuntimeDir, 0700)
c.Assert(err, IsNil)
s.agent, err = agent.New()
c.Assert(err, IsNil)
s.agent.Start()
}
func (s *servicesTestSuite) TearDownTest(c *C) {
if s.agent != nil {
err := s.agent.Stop()
c.Check(err, IsNil)
}
s.systemctlRestorer()
s.delaysRestorer()
dirs.SetRootDir("")
s.DBusTest.TearDownTest(c)
}
func (s *servicesTestSuite) TestAddSnapServicesAndRemove(c *C) {
info := snaptest.MockSnap(c, packageHello, &snap.SideInfo{Revision: snap.R(12)})
svcFile := filepath.Join(s.tempdir, "/etc/systemd/system/snap.hello-snap.svc1.service")
err := wrappers.AddSnapServices(info, nil, progress.Null)
c.Assert(err, IsNil)
c.Check(s.sysdLog, DeepEquals, [][]string{
{"daemon-reload"},
})
s.sysdLog = nil
flags := &wrappers.StartServicesFlags{Enable: true}
err = wrappers.StartServices(info.Services(), nil, flags, progress.Null, s.perfTimings)
c.Assert(err, IsNil)
c.Check(s.sysdLog, DeepEquals, [][]string{
{"--no-reload", "enable", filepath.Base(svcFile)},
{"daemon-reload"},
{"start", filepath.Base(svcFile)},
})
dir := filepath.Join(dirs.SnapMountDir, "hello-snap", "12.mount")
c.Assert(svcFile, testutil.FileEquals, fmt.Sprintf(`[Unit]
# Auto-generated, DO NOT EDIT
Description=Service for snap application hello-snap.svc1
Requires=%[1]s
Wants=network.target
After=%[1]s network.target snapd.apparmor.service
X-Snappy=yes
[Service]
EnvironmentFile=-/etc/environment
ExecStart=/usr/bin/snap run hello-snap.svc1
SyslogIdentifier=hello-snap.svc1
Restart=on-failure
WorkingDirectory=%[2]s/var/snap/hello-snap/12
ExecStop=/usr/bin/snap run --command=stop hello-snap.svc1
ExecStopPost=/usr/bin/snap run --command=post-stop hello-snap.svc1
TimeoutStopSec=30
Type=forking
[Install]
WantedBy=multi-user.target
`,
systemd.EscapeUnitNamePath(dir),
dirs.GlobalRootDir,
))
s.sysdLog = nil
err = wrappers.StopServices(info.Services(), nil, "", progress.Null, s.perfTimings)
c.Assert(err, IsNil)
c.Assert(s.sysdLog, HasLen, 2)
c.Check(s.sysdLog, DeepEquals, [][]string{
{"stop", filepath.Base(svcFile)},
{"show", "--property=ActiveState", "snap.hello-snap.svc1.service"},
})
s.sysdLog = nil
err = wrappers.RemoveSnapServices(info, progress.Null)
c.Assert(err, IsNil)
c.Check(svcFile, testutil.FileAbsent)
c.Assert(s.sysdLog, DeepEquals, [][]string{
{"--no-reload", "disable", filepath.Base(svcFile)},
{"daemon-reload"},
})
}
func (s *servicesTestSuite) TestEnsureSnapServicesAdds(c *C) {
// map unit -> new
seen := make(map[string]bool)
cb := func(app *snap.AppInfo, grp *quota.Group, unitType, name string, old, new string) {
seen[fmt.Sprintf("%s:%s:%s:%s", app.Snap.InstanceName(), app.Name, unitType, name)] = old == ""
}
info := snaptest.MockSnap(c, packageHello, &snap.SideInfo{Revision: snap.R(12)})
svcFile := filepath.Join(s.tempdir, "/etc/systemd/system/snap.hello-snap.svc1.service")
m := map[*snap.Info]*wrappers.SnapServiceOptions{
info: nil,
}
err := wrappers.EnsureSnapServices(m, nil, cb, progress.Null)
c.Assert(err, IsNil)
c.Check(s.sysdLog, DeepEquals, [][]string{
{"daemon-reload"},
})
c.Check(seen, DeepEquals, map[string]bool{
"hello-snap:svc1:service:svc1": true,
})
dir := filepath.Join(dirs.SnapMountDir, "hello-snap", "12.mount")
c.Assert(svcFile, testutil.FileEquals, fmt.Sprintf(`[Unit]
# Auto-generated, DO NOT EDIT
Description=Service for snap application hello-snap.svc1
Requires=%[1]s
Wants=network.target
After=%[1]s network.target snapd.apparmor.service
X-Snappy=yes
[Service]
EnvironmentFile=-/etc/environment
ExecStart=/usr/bin/snap run hello-snap.svc1
SyslogIdentifier=hello-snap.svc1
Restart=on-failure
WorkingDirectory=%[2]s/var/snap/hello-snap/12
ExecStop=/usr/bin/snap run --command=stop hello-snap.svc1
ExecStopPost=/usr/bin/snap run --command=post-stop hello-snap.svc1
TimeoutStopSec=30
Type=forking
[Install]
WantedBy=multi-user.target
`,
systemd.EscapeUnitNamePath(dir),
dirs.GlobalRootDir,
))
}
func (s *servicesTestSuite) TestEnsureSnapServicesWithQuotas(c *C) {
info := snaptest.MockSnap(c, packageHello, &snap.SideInfo{Revision: snap.R(12)})
svcFile := filepath.Join(s.tempdir, "/etc/systemd/system/snap.hello-snap.svc1.service")
// set up arbitrary quotas for the group to test they get written correctly to the slice
resourceLimits := quota.NewResourcesBuilder().
WithMemoryLimit(quantity.SizeGiB).
WithCPUCount(2).
WithCPUPercentage(50).
WithAllowedCPUs([]int{0, 1}).
WithThreadLimit(32).
Build()
grp, err := quota.NewGroup("foogroup", resourceLimits)
c.Assert(err, IsNil)
m := map[*snap.Info]*wrappers.SnapServiceOptions{
info: {QuotaGroup: grp},
}
dir := filepath.Join(dirs.SnapMountDir, "hello-snap", "12.mount")
svcContent := fmt.Sprintf(`[Unit]
# Auto-generated, DO NOT EDIT
Description=Service for snap application hello-snap.svc1
Requires=%[1]s
Wants=network.target
After=%[1]s network.target snapd.apparmor.service
X-Snappy=yes
[Service]
EnvironmentFile=-/etc/environment
ExecStart=/usr/bin/snap run hello-snap.svc1
SyslogIdentifier=hello-snap.svc1
Restart=on-failure
WorkingDirectory=%[2]s/var/snap/hello-snap/12
ExecStop=/usr/bin/snap run --command=stop hello-snap.svc1
ExecStopPost=/usr/bin/snap run --command=post-stop hello-snap.svc1
TimeoutStopSec=30
Type=forking
Slice=snap.foogroup.slice
[Install]
WantedBy=multi-user.target
`,
systemd.EscapeUnitNamePath(dir),
dirs.GlobalRootDir,
)
sliceTempl := `[Unit]
Description=Slice for snap quota group %s
Before=slices.target
X-Snappy=yes
[Slice]
# Always enable cpu accounting, so the following cpu quota options have an effect
CPUAccounting=true
CPUQuota=%[2]d%%
AllowedCPUs=%[3]s
# Always enable memory accounting otherwise the MemoryMax setting does nothing.
MemoryAccounting=true
MemoryMax=%[4]d
# for compatibility with older versions of systemd
MemoryLimit=%[4]d
# Always enable task accounting in order to be able to count the processes/
# threads, etc for a slice
TasksAccounting=true
TasksMax=%[5]d
`
allowedCpusValue := strutil.IntsToCommaSeparated(resourceLimits.CPUSet.CPUs)
sliceContent := fmt.Sprintf(sliceTempl, grp.Name,
resourceLimits.CPU.Count*resourceLimits.CPU.Percentage,
allowedCpusValue,
resourceLimits.Memory.Limit,
resourceLimits.Threads.Limit)
exp := []changesObservation{
{
snapName: "hello-snap",
unitType: "service",
name: "svc1",
old: "",
new: svcContent,
},
{
grp: grp,
unitType: "slice",
new: sliceContent,
old: "",
name: "foogroup",
},
}
r, observe := expChangeObserver(c, exp)
defer r()
err = wrappers.EnsureSnapServices(m, nil, observe, progress.Null)
c.Assert(err, IsNil)
c.Check(s.sysdLog, DeepEquals, [][]string{
{"daemon-reload"},
})
c.Assert(svcFile, testutil.FileEquals, svcContent)
}
func (s *servicesTestSuite) TestEnsureSnapServicesWithZeroCpuCountQuotas(c *C) {
// Kind of a special case, if the cpu count is zero it needs to automatically scale
// at the moment of writing the service file to the current number of cpu cores
info := snaptest.MockSnap(c, packageHello, &snap.SideInfo{Revision: snap.R(12)})
svcFile := filepath.Join(s.tempdir, "/etc/systemd/system/snap.hello-snap.svc1.service")
// set up arbitrary quotas for the group to test they get written correctly to the slice
resourceLimits := quota.NewResourcesBuilder().
WithCPUPercentage(50).
Build()
grp, err := quota.NewGroup("foogroup", resourceLimits)
c.Assert(err, IsNil)
m := map[*snap.Info]*wrappers.SnapServiceOptions{
info: {QuotaGroup: grp},
}
dir := filepath.Join(dirs.SnapMountDir, "hello-snap", "12.mount")
svcContent := fmt.Sprintf(`[Unit]
# Auto-generated, DO NOT EDIT
Description=Service for snap application hello-snap.svc1
Requires=%[1]s
Wants=network.target
After=%[1]s network.target snapd.apparmor.service
X-Snappy=yes
[Service]
EnvironmentFile=-/etc/environment
ExecStart=/usr/bin/snap run hello-snap.svc1
SyslogIdentifier=hello-snap.svc1
Restart=on-failure
WorkingDirectory=%[2]s/var/snap/hello-snap/12
ExecStop=/usr/bin/snap run --command=stop hello-snap.svc1
ExecStopPost=/usr/bin/snap run --command=post-stop hello-snap.svc1
TimeoutStopSec=30
Type=forking
Slice=snap.foogroup.slice
[Install]
WantedBy=multi-user.target
`,
systemd.EscapeUnitNamePath(dir),
dirs.GlobalRootDir,
)
sliceTempl := `[Unit]
Description=Slice for snap quota group %s
Before=slices.target
X-Snappy=yes
[Slice]
# Always enable cpu accounting, so the following cpu quota options have an effect
CPUAccounting=true
CPUQuota=%[2]d%%
# Always enable memory accounting otherwise the MemoryMax setting does nothing.
MemoryAccounting=true
# Always enable task accounting in order to be able to count the processes/
# threads, etc for a slice
TasksAccounting=true
`
// The reason we are not mocking the cpu count here is because we are relying
// on the real code to produce the slice file content, and it will always use
// the current number of cores, so we also use the current number of cores of
// the test runner here.
sliceContent := fmt.Sprintf(sliceTempl, grp.Name,
runtime.NumCPU()*resourceLimits.CPU.Percentage)
exp := []changesObservation{
{
snapName: "hello-snap",
unitType: "service",
name: "svc1",
old: "",
new: svcContent,
},
{
grp: grp,
unitType: "slice",
new: sliceContent,
old: "",
name: "foogroup",
},
}
r, observe := expChangeObserver(c, exp)
defer r()
err = wrappers.EnsureSnapServices(m, nil, observe, progress.Null)
c.Assert(err, IsNil)
c.Check(s.sysdLog, DeepEquals, [][]string{
{"daemon-reload"},
})
c.Assert(svcFile, testutil.FileEquals, svcContent)
}
func (s *servicesTestSuite) TestEnsureSnapServicesWithZeroCpuCountAndCpuSetQuotas(c *C) {
// Another special case, if the cpu count is zero it needs to automatically scale as the
// previous test, but only up the maximum allowed provided in the cpu-set. So in this test
// we provide only 1 allowed CPU, which means that the percentage that will be written is 50%
// and not 200% or how many cores that runs this test!
info := snaptest.MockSnap(c, packageHello, &snap.SideInfo{Revision: snap.R(12)})
svcFile := filepath.Join(s.tempdir, "/etc/systemd/system/snap.hello-snap.svc1.service")
// set up arbitrary quotas for the group to test they get written correctly to the slice
resourceLimits := quota.NewResourcesBuilder().
WithCPUPercentage(50).
WithAllowedCPUs([]int{0}).
Build()
grp, err := quota.NewGroup("foogroup", resourceLimits)
c.Assert(err, IsNil)
m := map[*snap.Info]*wrappers.SnapServiceOptions{
info: {QuotaGroup: grp},
}
dir := filepath.Join(dirs.SnapMountDir, "hello-snap", "12.mount")
svcContent := fmt.Sprintf(`[Unit]
# Auto-generated, DO NOT EDIT
Description=Service for snap application hello-snap.svc1
Requires=%[1]s
Wants=network.target
After=%[1]s network.target snapd.apparmor.service
X-Snappy=yes
[Service]
EnvironmentFile=-/etc/environment
ExecStart=/usr/bin/snap run hello-snap.svc1
SyslogIdentifier=hello-snap.svc1
Restart=on-failure
WorkingDirectory=%[2]s/var/snap/hello-snap/12
ExecStop=/usr/bin/snap run --command=stop hello-snap.svc1
ExecStopPost=/usr/bin/snap run --command=post-stop hello-snap.svc1
TimeoutStopSec=30
Type=forking
Slice=snap.foogroup.slice
[Install]
WantedBy=multi-user.target
`,
systemd.EscapeUnitNamePath(dir),
dirs.GlobalRootDir,
)
sliceTempl := `[Unit]
Description=Slice for snap quota group %s
Before=slices.target
X-Snappy=yes
[Slice]
# Always enable cpu accounting, so the following cpu quota options have an effect
CPUAccounting=true
CPUQuota=50%%
AllowedCPUs=0
# Always enable memory accounting otherwise the MemoryMax setting does nothing.
MemoryAccounting=true
# Always enable task accounting in order to be able to count the processes/
# threads, etc for a slice
TasksAccounting=true
`
sliceContent := fmt.Sprintf(sliceTempl, grp.Name)
exp := []changesObservation{
{
snapName: "hello-snap",
unitType: "service",
name: "svc1",
old: "",
new: svcContent,
},
{
grp: grp,
unitType: "slice",
new: sliceContent,
old: "",
name: "foogroup",
},
}
r, observe := expChangeObserver(c, exp)
defer r()
err = wrappers.EnsureSnapServices(m, nil, observe, progress.Null)
c.Assert(err, IsNil)
c.Check(s.sysdLog, DeepEquals, [][]string{
{"daemon-reload"},
})
c.Assert(svcFile, testutil.FileEquals, svcContent)
}
type changesObservation struct {
snapName string
grp *quota.Group
unitType string
name string
old string
new string
}
func expChangeObserver(c *C, exp []changesObservation) (restore func(), obs wrappers.ObserveChangeCallback) {
changesObserved := []changesObservation{}
f := func(app *snap.AppInfo, grp *quota.Group, unitType, name, old, new string) {
snapName := ""
if app != nil {
snapName = app.Snap.SnapName()
}
changesObserved = append(changesObserved, changesObservation{
snapName: snapName,
grp: grp,
unitType: unitType,
name: name,
old: old,
new: new,
})
}
r := func() {
// sort the changesObserved by snapName, with all services being
// observed first, then all groups secondly
groupObservations := make([]changesObservation, 0, len(changesObserved))
svcObservations := make([]changesObservation, 0, len(changesObserved))
for _, chg := range changesObserved {
if chg.unitType == "slice" {
groupObservations = append(groupObservations, chg)
} else {
svcObservations = append(svcObservations, chg)
}
}
// sort svcObservations, note we do not need to sort groups, since
// quota groups are iterated over in a stable sorted order via
// QuotaGroupSet.AllQuotaGroups
sort.SliceStable(svcObservations, func(i, j int) bool {
return svcObservations[i].snapName < svcObservations[j].snapName
})
finalSortChangesObserved := make([]changesObservation, 0, len(changesObserved))
finalSortChangesObserved = append(finalSortChangesObserved, svcObservations...)
finalSortChangesObserved = append(finalSortChangesObserved, groupObservations...)
c.Assert(finalSortChangesObserved, DeepEquals, exp)
}
return r, f
}
func (s *servicesTestSuite) TestEnsureSnapServicesRewritesQuotaSlices(c *C) {
info := snaptest.MockSnap(c, packageHello, &snap.SideInfo{Revision: snap.R(12)})
svcFile := filepath.Join(s.tempdir, "/etc/systemd/system/snap.hello-snap.svc1.service")
memLimit1 := quantity.SizeGiB
memLimit2 := quantity.SizeGiB * 2
// write both the unit file and a slice with a different memory limit
// setting than will be provided below
sliceTempl := `[Unit]
Description=Slice for snap quota group %s
Before=slices.target
X-Snappy=yes
[Slice]
# Always enable cpu accounting, so the following cpu quota options have an effect
CPUAccounting=true
# Always enable memory accounting otherwise the MemoryMax setting does nothing.
MemoryAccounting=true
MemoryMax=%[2]s
# for compatibility with older versions of systemd
MemoryLimit=%[2]s
# Always enable task accounting in order to be able to count the processes/
# threads, etc for a slice
TasksAccounting=true
`
sliceFile := filepath.Join(s.tempdir, "/etc/systemd/system/snap.foogroup.slice")
dir := filepath.Join(dirs.SnapMountDir, "hello-snap", "12.mount")
svcContent := fmt.Sprintf(`[Unit]
# Auto-generated, DO NOT EDIT
Description=Service for snap application hello-snap.svc1
Requires=%[1]s
Wants=network.target
After=%[1]s network.target snapd.apparmor.service
X-Snappy=yes
[Service]
EnvironmentFile=-/etc/environment
ExecStart=/usr/bin/snap run hello-snap.svc1
SyslogIdentifier=hello-snap.svc1
Restart=on-failure
WorkingDirectory=%[2]s/var/snap/hello-snap/12
ExecStop=/usr/bin/snap run --command=stop hello-snap.svc1
ExecStopPost=/usr/bin/snap run --command=post-stop hello-snap.svc1
TimeoutStopSec=30
Type=forking
Slice=snap.foogroup.slice
[Install]
WantedBy=multi-user.target
`,
systemd.EscapeUnitNamePath(dir),
dirs.GlobalRootDir,
)
err := os.MkdirAll(filepath.Dir(sliceFile), 0755)
c.Assert(err, IsNil)
oldContent := fmt.Sprintf(sliceTempl, "foogroup", memLimit1.String())
err = ioutil.WriteFile(sliceFile, []byte(oldContent), 0644)
c.Assert(err, IsNil)
err = ioutil.WriteFile(svcFile, []byte(svcContent), 0644)
c.Assert(err, IsNil)
// use new memory limit
resourceLimits := quota.NewResourcesBuilder().WithMemoryLimit(memLimit2).Build()
grp, err := quota.NewGroup("foogroup", resourceLimits)
c.Assert(err, IsNil)
m := map[*snap.Info]*wrappers.SnapServiceOptions{
info: {QuotaGroup: grp},
}
newContent := fmt.Sprintf(sliceTempl, "foogroup", memLimit2.String())
exp := []changesObservation{
{
grp: grp,
unitType: "slice",
new: newContent,
old: oldContent,
name: "foogroup",
},
}
r, observe := expChangeObserver(c, exp)
defer r()
err = wrappers.EnsureSnapServices(m, nil, observe, progress.Null)
c.Assert(err, IsNil)
c.Check(s.sysdLog, DeepEquals, [][]string{
{"daemon-reload"},
})
c.Assert(svcFile, testutil.FileEquals, svcContent)
c.Assert(sliceFile, testutil.FileEquals, newContent)
}
func (s *servicesTestSuite) TestEnsureSnapServicesDoesNotRewriteQuotaSlicesOnNoop(c *C) {
info := snaptest.MockSnap(c, packageHello, &snap.SideInfo{Revision: snap.R(12)})
svcFile := filepath.Join(s.tempdir, "/etc/systemd/system/snap.hello-snap.svc1.service")
memLimit := quantity.SizeGiB
taskLimit := 32 // arbitrarily chosen
// write both the unit file and a slice before running the ensure
sliceTempl := `[Unit]
Description=Slice for snap quota group %s
Before=slices.target
X-Snappy=yes
[Slice]
# Always enable cpu accounting, so the following cpu quota options have an effect
CPUAccounting=true
# Always enable memory accounting otherwise the MemoryMax setting does nothing.
MemoryAccounting=true
MemoryMax=%[2]s
# for compatibility with older versions of systemd
MemoryLimit=%[2]s
# Always enable task accounting in order to be able to count the processes/
# threads, etc for a slice
TasksAccounting=true
TasksMax=%[3]d
`
sliceFile := filepath.Join(s.tempdir, "/etc/systemd/system/snap.foogroup.slice")
dir := filepath.Join(dirs.SnapMountDir, "hello-snap", "12.mount")
svcContent := fmt.Sprintf(`[Unit]
# Auto-generated, DO NOT EDIT
Description=Service for snap application hello-snap.svc1
Requires=%[1]s
Wants=network.target
After=%[1]s network.target snapd.apparmor.service
X-Snappy=yes
[Service]
EnvironmentFile=-/etc/environment
ExecStart=/usr/bin/snap run hello-snap.svc1
SyslogIdentifier=hello-snap.svc1
Restart=on-failure
WorkingDirectory=%[2]s/var/snap/hello-snap/12
ExecStop=/usr/bin/snap run --command=stop hello-snap.svc1
ExecStopPost=/usr/bin/snap run --command=post-stop hello-snap.svc1
TimeoutStopSec=30
Type=forking
Slice=snap.foogroup.slice
[Install]
WantedBy=multi-user.target
`,
systemd.EscapeUnitNamePath(dir),
dirs.GlobalRootDir,
)
err := os.MkdirAll(filepath.Dir(sliceFile), 0755)
c.Assert(err, IsNil)
err = ioutil.WriteFile(sliceFile, []byte(fmt.Sprintf(sliceTempl, "foogroup", memLimit.String(), taskLimit)), 0644)
c.Assert(err, IsNil)
err = ioutil.WriteFile(svcFile, []byte(svcContent), 0644)
c.Assert(err, IsNil)
resourceLimits := quota.NewResourcesBuilder().WithMemoryLimit(memLimit).WithThreadLimit(taskLimit).Build()
grp, err := quota.NewGroup("foogroup", resourceLimits)
c.Assert(err, IsNil)
m := map[*snap.Info]*wrappers.SnapServiceOptions{
info: {QuotaGroup: grp},
}
observe := func(app *snap.AppInfo, grp *quota.Group, unitType, name, old, new string) {
c.Error("unexpected call to observe function")
}
err = wrappers.EnsureSnapServices(m, nil, observe, progress.Null)
c.Assert(err, IsNil)
// no daemon restart since the files didn't change
c.Check(s.sysdLog, HasLen, 0)
c.Assert(svcFile, testutil.FileEquals, svcContent)
c.Assert(sliceFile, testutil.FileEquals, fmt.Sprintf(sliceTempl, "foogroup", memLimit.String(), taskLimit))
}
func (s *servicesTestSuite) TestRemoveQuotaGroup(c *C) {
// create the group
resourceLimits := quota.NewResourcesBuilder().WithMemoryLimit(650 * quantity.SizeKiB).Build()
grp, err := quota.NewGroup("foogroup", resourceLimits)
c.Assert(err, IsNil)
sliceFile := filepath.Join(s.tempdir, "/etc/systemd/system/snap.foogroup.slice")
c.Assert(sliceFile, testutil.FileAbsent)
// removing the group when the slice file doesn't exist is not an error
err = wrappers.RemoveQuotaGroup(grp, progress.Null)
c.Assert(err, IsNil)
c.Assert(s.sysdLog, HasLen, 0)
c.Assert(sliceFile, testutil.FileAbsent)
// now write slice file and ensure it is deleted
sliceTempl := `[Unit]
Description=Slice for snap quota group %s
Before=slices.target
X-Snappy=yes
[Slice]
# Always enable cpu accounting, so the following cpu quota options have an effect
CPUAccounting=true
# Always enable memory accounting otherwise the MemoryMax setting does nothing.
MemoryAccounting=true
MemoryMax=1024
# for compatibility with older versions of systemd
MemoryLimit=1024
`
err = os.MkdirAll(filepath.Dir(sliceFile), 0755)
c.Assert(err, IsNil)
err = ioutil.WriteFile(sliceFile, []byte(fmt.Sprintf(sliceTempl, "foogroup")), 0644)
c.Assert(err, IsNil)
// removing it deletes it
err = wrappers.RemoveQuotaGroup(grp, progress.Null)
c.Assert(err, IsNil)
c.Assert(s.sysdLog, DeepEquals, [][]string{
{"daemon-reload"},
})
c.Assert(sliceFile, testutil.FileAbsent)
}
func (s *servicesTestSuite) TestEnsureSnapServicesWithSubGroupQuotaGroupsForSnaps(c *C) {
info1 := snaptest.MockSnap(c, packageHello, &snap.SideInfo{Revision: snap.R(12)})
info2 := snaptest.MockSnap(c, `
name: hello-other-snap
version: 1.10
summary: hello
description: Hello...
apps:
hello:
command: bin/hello
world:
command: bin/world
completer: world-completer.sh
svc1:
command: bin/hello
stop-command: bin/goodbye
post-stop-command: bin/missya
daemon: forking
`, &snap.SideInfo{Revision: snap.R(12)})
svcFile1 := filepath.Join(s.tempdir, "/etc/systemd/system/snap.hello-snap.svc1.service")
svcFile2 := filepath.Join(s.tempdir, "/etc/systemd/system/snap.hello-other-snap.svc1.service")
var err error
resourceLimits := quota.NewResourcesBuilder().
WithMemoryLimit(quantity.SizeGiB).
WithCPUCount(4).
WithCPUPercentage(25).
Build()
// make a root quota group and add the first snap to it
grp, err := quota.NewGroup("foogroup", resourceLimits)
c.Assert(err, IsNil)
// the second group is a sub-group with the same limit, but is for the
// second snap
subgrp, err := grp.NewSubGroup("subgroup", resourceLimits)
c.Assert(err, IsNil)
sliceFile := filepath.Join(s.tempdir, "/etc/systemd/system/snap.foogroup.slice")
subSliceFile := filepath.Join(s.tempdir, "/etc/systemd/system/snap.foogroup-subgroup.slice")
m := map[*snap.Info]*wrappers.SnapServiceOptions{
info1: {QuotaGroup: grp},
info2: {QuotaGroup: subgrp},
}
sliceTempl := `[Unit]
Description=Slice for snap quota group %s
Before=slices.target
X-Snappy=yes
[Slice]
# Always enable cpu accounting, so the following cpu quota options have an effect
CPUAccounting=true
CPUQuota=%[2]d%%
# Always enable memory accounting otherwise the MemoryMax setting does nothing.
MemoryAccounting=true
MemoryMax=%[3]d
# for compatibility with older versions of systemd
MemoryLimit=%[3]d
# Always enable task accounting in order to be able to count the processes/
# threads, etc for a slice
TasksAccounting=true
`
sliceContent := fmt.Sprintf(sliceTempl, "foogroup", resourceLimits.CPU.Count*resourceLimits.CPU.Percentage, resourceLimits.Memory.Limit)
subSliceContent := fmt.Sprintf(sliceTempl, "subgroup", resourceLimits.CPU.Count*resourceLimits.CPU.Percentage, resourceLimits.Memory.Limit)
svcTemplate := `[Unit]
# Auto-generated, DO NOT EDIT
Description=Service for snap application %[1]s.svc1
Requires=%[2]s
Wants=network.target
After=%[2]s network.target snapd.apparmor.service
X-Snappy=yes
[Service]
EnvironmentFile=-/etc/environment
ExecStart=/usr/bin/snap run %[1]s.svc1
SyslogIdentifier=%[1]s.svc1
Restart=on-failure
WorkingDirectory=%[3]s/var/snap/%[1]s/12
ExecStop=/usr/bin/snap run --command=stop %[1]s.svc1
ExecStopPost=/usr/bin/snap run --command=post-stop %[1]s.svc1
TimeoutStopSec=30
Type=forking
Slice=%[4]s
[Install]
WantedBy=multi-user.target
`
dir1 := filepath.Join(dirs.SnapMountDir, "hello-snap", "12.mount")
dir2 := filepath.Join(dirs.SnapMountDir, "hello-other-snap", "12.mount")
helloSnapContent := fmt.Sprintf(svcTemplate,
"hello-snap",
systemd.EscapeUnitNamePath(dir1),
dirs.GlobalRootDir,
"snap.foogroup.slice",
)
helloOtherSnapContent := fmt.Sprintf(svcTemplate,
"hello-other-snap",
systemd.EscapeUnitNamePath(dir2),
dirs.GlobalRootDir,
"snap.foogroup-subgroup.slice",
)
exp := []changesObservation{
{
snapName: "hello-other-snap",
unitType: "service",
name: "svc1",
old: "",
new: helloOtherSnapContent,
},
{
snapName: "hello-snap",
unitType: "service",
name: "svc1",
old: "",
new: helloSnapContent,
},
{
grp: grp,
unitType: "slice",
new: sliceContent,
old: "",
name: "foogroup",
},
{
grp: subgrp,
unitType: "slice",
new: subSliceContent,
old: "",
name: "subgroup",
},
}
r, observe := expChangeObserver(c, exp)
defer r()
err = wrappers.EnsureSnapServices(m, nil, observe, progress.Null)
c.Assert(err, IsNil)
c.Check(s.sysdLog, DeepEquals, [][]string{
{"daemon-reload"},
})
c.Assert(svcFile1, testutil.FileEquals, helloSnapContent)
c.Assert(svcFile2, testutil.FileEquals, helloOtherSnapContent)
// check that the slice units were also generated
c.Assert(sliceFile, testutil.FileEquals, sliceContent)
c.Assert(subSliceFile, testutil.FileEquals, subSliceContent)
}
func (s *servicesTestSuite) TestEnsureSnapServicesWithSubGroupQuotaGroupsGeneratesParentGroups(c *C) {
info := snaptest.MockSnap(c, packageHello, &snap.SideInfo{Revision: snap.R(12)})
svcFile1 := filepath.Join(s.tempdir, "/etc/systemd/system/snap.hello-snap.svc1.service")
var err error
resourceLimits := quota.NewResourcesBuilder().
WithMemoryLimit(quantity.SizeGiB).
WithAllowedCPUs([]int{0}).
Build()
// make a root quota group without any snaps in it
grp, err := quota.NewGroup("foogroup", resourceLimits)
c.Assert(err, IsNil)
// the second group is a sub-group with the same limit, but it is the one
// with the snap in it
subgrp, err := grp.NewSubGroup("subgroup", resourceLimits)
c.Assert(err, IsNil)
sliceFile := filepath.Join(s.tempdir, "/etc/systemd/system/snap.foogroup.slice")
subSliceFile := filepath.Join(s.tempdir, "/etc/systemd/system/snap.foogroup-subgroup.slice")
m := map[*snap.Info]*wrappers.SnapServiceOptions{
info: {QuotaGroup: subgrp},
}
err = wrappers.EnsureSnapServices(m, nil, nil, progress.Null)
c.Assert(err, IsNil)
c.Check(s.sysdLog, DeepEquals, [][]string{
{"daemon-reload"},
})