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grub_test.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2014-2024 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 bootloader_test
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"github.com/mvo5/goconfigparser"
. "gopkg.in/check.v1"
"github.com/snapcore/snapd/arch"
"github.com/snapcore/snapd/arch/archtest"
"github.com/snapcore/snapd/bootloader"
"github.com/snapcore/snapd/bootloader/assets"
"github.com/snapcore/snapd/bootloader/grubenv"
"github.com/snapcore/snapd/dirs"
"github.com/snapcore/snapd/osutil"
"github.com/snapcore/snapd/snap"
"github.com/snapcore/snapd/snap/snapfile"
"github.com/snapcore/snapd/snap/snaptest"
"github.com/snapcore/snapd/testutil"
)
type grubTestSuite struct {
baseBootenvTestSuite
bootdir string
}
var _ = Suite(&grubTestSuite{})
func (s *grubTestSuite) SetUpTest(c *C) {
s.baseBootenvTestSuite.SetUpTest(c)
bootloader.MockGrubFiles(c, s.rootdir)
s.bootdir = filepath.Join(s.rootdir, "boot")
// By default assume amd64 in the tests: there are specialized
// tests for other arches
s.AddCleanup(archtest.MockArchitecture("amd64"))
snippets := []assets.ForEditions{
{FirstEdition: 1, Snippet: []byte("console=ttyS0 console=tty1 panic=-1")},
}
s.AddCleanup(assets.MockSnippetsForEdition("grub.cfg:static-cmdline", snippets))
s.AddCleanup(assets.MockSnippetsForEdition("grub-recovery.cfg:static-cmdline", snippets))
}
// grubEditenvCmd finds the right grub{,2}-editenv command
func grubEditenvCmd() string {
for _, exe := range []string{"grub2-editenv", "grub-editenv"} {
if osutil.ExecutableExists(exe) {
return exe
}
}
return ""
}
func grubEnvPath(rootdir string) string {
return filepath.Join(rootdir, "boot/grub/grubenv")
}
func (s *grubTestSuite) grubEditenvSet(c *C, key, value string) {
if grubEditenvCmd() == "" {
c.Skip("grub{,2}-editenv is not available")
}
output, err := exec.Command(grubEditenvCmd(), grubEnvPath(s.rootdir), "set", fmt.Sprintf("%s=%s", key, value)).CombinedOutput()
c.Check(err, IsNil)
c.Check(string(output), Equals, "")
}
func (s *grubTestSuite) grubEditenvGet(c *C, key string) string {
if grubEditenvCmd() == "" {
c.Skip("grub{,2}-editenv is not available")
}
output, err := exec.Command(grubEditenvCmd(), grubEnvPath(s.rootdir), "list").CombinedOutput()
c.Assert(err, IsNil)
cfg := goconfigparser.New()
cfg.AllowNoSectionHeader = true
err = cfg.ReadString(string(output))
c.Assert(err, IsNil)
v, err := cfg.Get("", key)
c.Assert(err, IsNil)
return v
}
func (s *grubTestSuite) makeFakeGrubEnv(c *C) {
s.grubEditenvSet(c, "k", "v")
}
func (s *grubTestSuite) TestNewGrub(c *C) {
// no files means bl is not present, but we can still create the bl object
c.Assert(os.RemoveAll(s.rootdir), IsNil)
g := bootloader.NewGrub(s.rootdir, nil)
c.Assert(g, NotNil)
c.Assert(g.Name(), Equals, "grub")
present, err := g.Present()
c.Assert(err, IsNil)
c.Assert(present, Equals, false)
// now with files present, the bl is present
bootloader.MockGrubFiles(c, s.rootdir)
s.makeFakeGrubEnv(c)
present, err = g.Present()
c.Assert(err, IsNil)
c.Assert(present, Equals, true)
}
func (s *grubTestSuite) TestGetBootloaderWithGrub(c *C) {
s.makeFakeGrubEnv(c)
bootloader, err := bootloader.Find(s.rootdir, nil)
c.Assert(err, IsNil)
c.Assert(bootloader.Name(), Equals, "grub")
}
func (s *grubTestSuite) TestGetBootloaderWithGrubWithDefaultRoot(c *C) {
s.makeFakeGrubEnv(c)
dirs.SetRootDir(s.rootdir)
defer func() { dirs.SetRootDir("") }()
bootloader, err := bootloader.Find("", nil)
c.Assert(err, IsNil)
c.Assert(bootloader.Name(), Equals, "grub")
}
func (s *grubTestSuite) TestGetBootVer(c *C) {
s.makeFakeGrubEnv(c)
s.grubEditenvSet(c, "snap_mode", "regular")
g := bootloader.NewGrub(s.rootdir, nil)
v, err := g.GetBootVars("snap_mode")
c.Assert(err, IsNil)
c.Check(v, HasLen, 1)
c.Check(v["snap_mode"], Equals, "regular")
}
func (s *grubTestSuite) TestSetBootVer(c *C) {
s.makeFakeGrubEnv(c)
g := bootloader.NewGrub(s.rootdir, nil)
err := g.SetBootVars(map[string]string{
"k1": "v1",
"k2": "v2",
})
c.Assert(err, IsNil)
c.Check(s.grubEditenvGet(c, "k1"), Equals, "v1")
c.Check(s.grubEditenvGet(c, "k2"), Equals, "v2")
}
func (s *grubTestSuite) TestExtractKernelAssetsNoUnpacksKernelForGrub(c *C) {
s.makeFakeGrubEnv(c)
g := bootloader.NewGrub(s.rootdir, nil)
files := [][]string{
{"kernel.img", "I'm a kernel"},
{"initrd.img", "...and I'm an initrd"},
{"meta/kernel.yaml", "version: 4.2"},
}
si := &snap.SideInfo{
RealName: "ubuntu-kernel",
Revision: snap.R(42),
}
fn := snaptest.MakeTestSnapWithFiles(c, packageKernel, files)
snapf, err := snapfile.Open(fn)
c.Assert(err, IsNil)
info, err := snap.ReadInfoFromSnapFile(snapf, si)
c.Assert(err, IsNil)
err = g.ExtractKernelAssets(info, snapf)
c.Assert(err, IsNil)
// kernel is *not* here
kernimg := filepath.Join(s.bootdir, "grub", "ubuntu-kernel_42.snap", "kernel.img")
c.Assert(osutil.FileExists(kernimg), Equals, false)
}
func (s *grubTestSuite) TestExtractKernelForceWorks(c *C) {
s.makeFakeGrubEnv(c)
g := bootloader.NewGrub(s.rootdir, nil)
c.Assert(g, NotNil)
files := [][]string{
{"kernel.img", "I'm a kernel"},
{"initrd.img", "...and I'm an initrd"},
{"meta/force-kernel-extraction", ""},
{"meta/kernel.yaml", "version: 4.2"},
}
si := &snap.SideInfo{
RealName: "ubuntu-kernel",
Revision: snap.R(42),
}
fn := snaptest.MakeTestSnapWithFiles(c, packageKernel, files)
snapf, err := snapfile.Open(fn)
c.Assert(err, IsNil)
info, err := snap.ReadInfoFromSnapFile(snapf, si)
c.Assert(err, IsNil)
err = g.ExtractKernelAssets(info, snapf)
c.Assert(err, IsNil)
// kernel is extracted
kernimg := filepath.Join(s.bootdir, "grub", "ubuntu-kernel_42.snap", "kernel.img")
c.Assert(osutil.FileExists(kernimg), Equals, true)
// initrd
initrdimg := filepath.Join(s.bootdir, "grub", "ubuntu-kernel_42.snap", "initrd.img")
c.Assert(osutil.FileExists(initrdimg), Equals, true)
// ensure that removal of assets also works
err = g.RemoveKernelAssets(info)
c.Assert(err, IsNil)
exists, _, err := osutil.DirExists(filepath.Dir(kernimg))
c.Assert(err, IsNil)
c.Check(exists, Equals, false)
}
func (s *grubTestSuite) grubDir() string {
return filepath.Join(s.bootdir, "grub")
}
func (s *grubTestSuite) grubEFINativeDir() string {
return filepath.Join(s.rootdir, "EFI/ubuntu")
}
func (s *grubTestSuite) makeFakeGrubEFINativeEnv(c *C, content []byte) {
err := os.MkdirAll(s.grubEFINativeDir(), 0755)
c.Assert(err, IsNil)
err = os.WriteFile(filepath.Join(s.grubEFINativeDir(), "grub.cfg"), content, 0644)
c.Assert(err, IsNil)
}
func (s *grubTestSuite) makeFakeShimFallback(c *C) {
err := os.MkdirAll(filepath.Join(s.rootdir, "/EFI/boot"), 0755)
c.Assert(err, IsNil)
_, err = os.Create(filepath.Join(s.rootdir, "/EFI/boot/fbx64.efi"))
c.Assert(err, IsNil)
_, err = os.Create(filepath.Join(s.rootdir, "/EFI/boot/fbaa64.efi"))
c.Assert(err, IsNil)
}
func (s *grubTestSuite) TestNewGrubWithOptionRecovery(c *C) {
s.makeFakeGrubEFINativeEnv(c, nil)
g := bootloader.NewGrub(s.rootdir, &bootloader.Options{Role: bootloader.RoleRecovery})
c.Assert(g, NotNil)
c.Assert(g.Name(), Equals, "grub")
}
func (s *grubTestSuite) TestNewGrubWithOptionRecoveryBootEnv(c *C) {
s.makeFakeGrubEFINativeEnv(c, nil)
g := bootloader.NewGrub(s.rootdir, &bootloader.Options{Role: bootloader.RoleRecovery})
// check that setting vars goes to the right place
c.Check(filepath.Join(s.grubEFINativeDir(), "grubenv"), testutil.FileAbsent)
err := g.SetBootVars(map[string]string{
"k1": "v1",
"k2": "v2",
})
c.Assert(err, IsNil)
c.Check(filepath.Join(s.grubEFINativeDir(), "grubenv"), testutil.FilePresent)
env, err := g.GetBootVars("k1", "k2")
c.Assert(err, IsNil)
c.Check(env, DeepEquals, map[string]string{
"k1": "v1",
"k2": "v2",
})
}
func (s *grubTestSuite) TestNewGrubWithOptionRecoveryNoEnv(c *C) {
// fake a *regular* grub env
s.makeFakeGrubEnv(c)
// we can't create a recovery grub with that
g, err := bootloader.Find(s.rootdir, &bootloader.Options{Role: bootloader.RoleRecovery})
c.Assert(g, IsNil)
c.Assert(err, Equals, bootloader.ErrBootloader)
}
func (s *grubTestSuite) TestGrubSetRecoverySystemEnv(c *C) {
s.makeFakeGrubEFINativeEnv(c, nil)
g := bootloader.NewGrub(s.rootdir, &bootloader.Options{Role: bootloader.RoleRecovery})
// check that we can set a recovery system specific bootenv
bvars := map[string]string{
"snapd_recovery_kernel": "/snaps/pc-kernel_1.snap",
"other_options": "are-supported",
}
err := g.SetRecoverySystemEnv("/systems/20191209", bvars)
c.Assert(err, IsNil)
recoverySystemGrubenv := filepath.Join(s.rootdir, "/systems/20191209/grubenv")
c.Assert(recoverySystemGrubenv, testutil.FilePresent)
genv := grubenv.NewEnv(recoverySystemGrubenv)
err = genv.Load()
c.Assert(err, IsNil)
c.Check(genv.Get("snapd_recovery_kernel"), Equals, "/snaps/pc-kernel_1.snap")
c.Check(genv.Get("other_options"), Equals, "are-supported")
}
func (s *grubTestSuite) TestGetRecoverySystemEnv(c *C) {
s.makeFakeGrubEFINativeEnv(c, nil)
g := bootloader.NewGrub(s.rootdir, &bootloader.Options{Role: bootloader.RoleRecovery})
err := os.MkdirAll(filepath.Join(s.rootdir, "/systems/20191209"), 0755)
c.Assert(err, IsNil)
recoverySystemGrubenv := filepath.Join(s.rootdir, "/systems/20191209/grubenv")
// does not fail when there is no recovery env
value, err := g.GetRecoverySystemEnv("/systems/20191209", "no_file")
c.Assert(err, IsNil)
c.Check(value, Equals, "")
genv := grubenv.NewEnv(recoverySystemGrubenv)
genv.Set("snapd_extra_cmdline_args", "foo bar baz")
genv.Set("random_option", `has "some spaces"`)
err = genv.Save()
c.Assert(err, IsNil)
value, err = g.GetRecoverySystemEnv("/systems/20191209", "snapd_extra_cmdline_args")
c.Assert(err, IsNil)
c.Check(value, Equals, "foo bar baz")
value, err = g.GetRecoverySystemEnv("/systems/20191209", "random_option")
c.Assert(err, IsNil)
c.Check(value, Equals, `has "some spaces"`)
value, err = g.GetRecoverySystemEnv("/systems/20191209", "not_set")
c.Assert(err, IsNil)
c.Check(value, Equals, ``)
}
func (s *grubTestSuite) makeKernelAssetSnap(c *C, snapFileName string) snap.PlaceInfo {
kernelSnap, err := snap.ParsePlaceInfoFromSnapFileName(snapFileName)
c.Assert(err, IsNil)
// make a kernel.efi snap as it would be by ExtractKernelAssets()
kernelSnapExtractedAssetsDir := filepath.Join(s.grubDir(), snapFileName)
err = os.MkdirAll(kernelSnapExtractedAssetsDir, 0755)
c.Assert(err, IsNil)
err = os.WriteFile(filepath.Join(kernelSnapExtractedAssetsDir, "kernel.efi"), nil, 0644)
c.Assert(err, IsNil)
return kernelSnap
}
func (s *grubTestSuite) makeKernelAssetSnapAndSymlink(c *C, snapFileName, symlinkName string) snap.PlaceInfo {
kernelSnap := s.makeKernelAssetSnap(c, snapFileName)
// make a kernel.efi symlink to the kernel.efi above
err := os.Symlink(
filepath.Join(snapFileName, "kernel.efi"),
filepath.Join(s.grubDir(), symlinkName),
)
c.Assert(err, IsNil)
return kernelSnap
}
func (s *grubTestSuite) TestGrubExtractedRunKernelImageKernel(c *C) {
s.makeFakeGrubEnv(c)
g := bootloader.NewGrub(s.rootdir, nil)
eg, ok := g.(bootloader.ExtractedRunKernelImageBootloader)
c.Assert(ok, Equals, true)
kernel := s.makeKernelAssetSnapAndSymlink(c, "pc-kernel_1.snap", "kernel.efi")
// ensure that the returned kernel is the same as the one we put there
sn, err := eg.Kernel()
c.Assert(err, IsNil)
c.Assert(sn, DeepEquals, kernel)
}
func (s *grubTestSuite) TestGrubExtractedRunKernelImageTryKernel(c *C) {
s.makeFakeGrubEnv(c)
g := bootloader.NewGrub(s.rootdir, nil)
eg, ok := g.(bootloader.ExtractedRunKernelImageBootloader)
c.Assert(ok, Equals, true)
// ensure it doesn't return anything when the symlink doesn't exist
_, err := eg.TryKernel()
c.Assert(err, Equals, bootloader.ErrNoTryKernelRef)
// when a bad kernel snap name is in the extracted path, it will complain
// appropriately
kernelSnapExtractedAssetsDir := filepath.Join(s.grubDir(), "bad_snap_rev_name")
badKernelSnapPath := filepath.Join(kernelSnapExtractedAssetsDir, "kernel.efi")
tryKernelSymlink := filepath.Join(s.grubDir(), "try-kernel.efi")
err = os.MkdirAll(kernelSnapExtractedAssetsDir, 0755)
c.Assert(err, IsNil)
err = os.WriteFile(badKernelSnapPath, nil, 0644)
c.Assert(err, IsNil)
err = os.Symlink("bad_snap_rev_name/kernel.efi", tryKernelSymlink)
c.Assert(err, IsNil)
_, err = eg.TryKernel()
c.Assert(err, ErrorMatches, "cannot parse kernel snap file name from symlink target \"bad_snap_rev_name\": .*")
// remove the bad symlink
err = os.Remove(tryKernelSymlink)
c.Assert(err, IsNil)
// make a real symlink
tryKernel := s.makeKernelAssetSnapAndSymlink(c, "pc-kernel_2.snap", "try-kernel.efi")
// ensure that the returned kernel is the same as the one we put there
sn, err := eg.TryKernel()
c.Assert(err, IsNil)
c.Assert(sn, DeepEquals, tryKernel)
// if the destination of the symlink is removed, we get an error
err = os.Remove(filepath.Join(s.grubDir(), "pc-kernel_2.snap", "kernel.efi"))
c.Assert(err, IsNil)
_, err = eg.TryKernel()
c.Assert(err, ErrorMatches, "cannot read dangling symlink try-kernel.efi")
}
func (s *grubTestSuite) TestGrubExtractedRunKernelImageEnableKernel(c *C) {
s.makeFakeGrubEnv(c)
g := bootloader.NewGrub(s.rootdir, nil)
eg, ok := g.(bootloader.ExtractedRunKernelImageBootloader)
c.Assert(ok, Equals, true)
// ensure we fail to create a dangling symlink to a kernel snap that was not
// actually extracted
nonExistSnap, err := snap.ParsePlaceInfoFromSnapFileName("pc-kernel_12.snap")
c.Assert(err, IsNil)
err = eg.EnableKernel(nonExistSnap)
c.Assert(err, ErrorMatches, "cannot enable kernel.efi at pc-kernel_12.snap/kernel.efi: file does not exist")
kernel := s.makeKernelAssetSnap(c, "pc-kernel_1.snap")
// enable the Kernel we extracted
err = eg.EnableKernel(kernel)
c.Assert(err, IsNil)
// ensure that the symlink was put where we expect it
asset, err := os.Readlink(filepath.Join(s.grubDir(), "kernel.efi"))
c.Assert(err, IsNil)
c.Assert(asset, DeepEquals, filepath.Join("pc-kernel_1.snap", "kernel.efi"))
// create a new kernel snap and ensure that we can safely enable that one
// too
kernel2 := s.makeKernelAssetSnap(c, "pc-kernel_2.snap")
err = eg.EnableKernel(kernel2)
c.Assert(err, IsNil)
// ensure that the symlink was put where we expect it
asset, err = os.Readlink(filepath.Join(s.grubDir(), "kernel.efi"))
c.Assert(err, IsNil)
c.Assert(asset, DeepEquals, filepath.Join("pc-kernel_2.snap", "kernel.efi"))
}
func (s *grubTestSuite) TestGrubExtractedRunKernelImageEnableTryKernel(c *C) {
s.makeFakeGrubEnv(c)
g := bootloader.NewGrub(s.rootdir, nil)
eg, ok := g.(bootloader.ExtractedRunKernelImageBootloader)
c.Assert(ok, Equals, true)
kernel := s.makeKernelAssetSnap(c, "pc-kernel_1.snap")
// enable the Kernel we extracted
err := eg.EnableTryKernel(kernel)
c.Assert(err, IsNil)
// ensure that the symlink was put where we expect it
asset, err := os.Readlink(filepath.Join(s.grubDir(), "try-kernel.efi"))
c.Assert(err, IsNil)
c.Assert(asset, DeepEquals, filepath.Join("pc-kernel_1.snap", "kernel.efi"))
}
func (s *grubTestSuite) TestGrubExtractedRunKernelImageDisableTryKernel(c *C) {
if os.Geteuid() == 0 {
c.Skip("the test cannot be run by the root user")
}
s.makeFakeGrubEnv(c)
g := bootloader.NewGrub(s.rootdir, nil)
eg, ok := g.(bootloader.ExtractedRunKernelImageBootloader)
c.Assert(ok, Equals, true)
// trying to disable when the try-kernel.efi symlink is missing does not
// raise any errors
err := eg.DisableTryKernel()
c.Assert(err, IsNil)
// make the symlink and check that the symlink is missing afterwards
s.makeKernelAssetSnapAndSymlink(c, "pc-kernel_1.snap", "try-kernel.efi")
// make sure symlink is there
c.Assert(filepath.Join(s.grubDir(), "try-kernel.efi"), testutil.FilePresent)
err = eg.DisableTryKernel()
c.Assert(err, IsNil)
// ensure that the symlink is no longer there
c.Assert(filepath.Join(s.grubDir(), "try-kernel.efi"), testutil.FileAbsent)
c.Assert(filepath.Join(s.grubDir(), "pc-kernel_1.snap/kernel.efi"), testutil.FilePresent)
// try again but make sure that the directory cannot be written to
s.makeKernelAssetSnapAndSymlink(c, "pc-kernel_1.snap", "try-kernel.efi")
err = os.Chmod(s.grubDir(), 000)
c.Assert(err, IsNil)
defer os.Chmod(s.grubDir(), 0755)
err = eg.DisableTryKernel()
c.Assert(err, ErrorMatches, "remove .*/grub/try-kernel.efi: permission denied")
}
func (s *grubTestSuite) TestKernelExtractionRunImageKernel(c *C) {
s.makeFakeGrubEnv(c)
g := bootloader.NewGrub(s.rootdir, &bootloader.Options{Role: bootloader.RoleRunMode})
c.Assert(g, NotNil)
files := [][]string{
{"kernel.efi", "I'm a kernel"},
{"another-kernel-file", "another kernel file"},
{"meta/kernel.yaml", "version: 4.2"},
}
si := &snap.SideInfo{
RealName: "ubuntu-kernel",
Revision: snap.R(42),
}
fn := snaptest.MakeTestSnapWithFiles(c, packageKernel, files)
snapf, err := snapfile.Open(fn)
c.Assert(err, IsNil)
info, err := snap.ReadInfoFromSnapFile(snapf, si)
c.Assert(err, IsNil)
err = g.ExtractKernelAssets(info, snapf)
c.Assert(err, IsNil)
// kernel is extracted
kernefi := filepath.Join(s.bootdir, "grub", "ubuntu-kernel_42.snap", "kernel.efi")
c.Assert(kernefi, testutil.FilePresent)
// other file is not extracted
other := filepath.Join(s.bootdir, "grub", "ubuntu-kernel_42.snap", "another-kernel-file")
c.Assert(other, testutil.FileAbsent)
// ensure that removal of assets also works
err = g.RemoveKernelAssets(info)
c.Assert(err, IsNil)
exists, _, err := osutil.DirExists(filepath.Dir(kernefi))
c.Assert(err, IsNil)
c.Check(exists, Equals, false)
}
func (s *grubTestSuite) TestKernelExtractionRunImageKernelNoSlashBoot(c *C) {
// this is ubuntu-boot but during install we use the native EFI/ubuntu
// layout, same as Recovery, without the /boot mount
s.makeFakeGrubEFINativeEnv(c, nil)
g := bootloader.NewGrub(s.rootdir, &bootloader.Options{Role: bootloader.RoleRunMode, NoSlashBoot: true})
c.Assert(g, NotNil)
files := [][]string{
{"kernel.efi", "I'm a kernel"},
{"another-kernel-file", "another kernel file"},
{"meta/kernel.yaml", "version: 4.2"},
}
si := &snap.SideInfo{
RealName: "ubuntu-kernel",
Revision: snap.R(42),
}
fn := snaptest.MakeTestSnapWithFiles(c, packageKernel, files)
snapf, err := snapfile.Open(fn)
c.Assert(err, IsNil)
info, err := snap.ReadInfoFromSnapFile(snapf, si)
c.Assert(err, IsNil)
err = g.ExtractKernelAssets(info, snapf)
c.Assert(err, IsNil)
// kernel is extracted
kernefi := filepath.Join(s.rootdir, "EFI/ubuntu", "ubuntu-kernel_42.snap", "kernel.efi")
c.Assert(kernefi, testutil.FilePresent)
// other file is not extracted
other := filepath.Join(s.rootdir, "EFI/ubuntu", "ubuntu-kernel_42.snap", "another-kernel-file")
c.Assert(other, testutil.FileAbsent)
// enable the Kernel we extracted
eg, ok := g.(bootloader.ExtractedRunKernelImageBootloader)
c.Assert(ok, Equals, true)
err = eg.EnableKernel(info)
c.Assert(err, IsNil)
// ensure that the symlink was put where we expect it
asset, err := os.Readlink(filepath.Join(s.rootdir, "EFI/ubuntu", "kernel.efi"))
c.Assert(err, IsNil)
c.Assert(asset, DeepEquals, filepath.Join("ubuntu-kernel_42.snap", "kernel.efi"))
// ensure that removal of assets also works
err = g.RemoveKernelAssets(info)
c.Assert(err, IsNil)
exists, _, err := osutil.DirExists(filepath.Dir(kernefi))
c.Assert(err, IsNil)
c.Check(exists, Equals, false)
}
func (s *grubTestSuite) TestListTrustedAssetsNotForArch(c *C) {
oldArch := arch.DpkgArchitecture()
defer arch.SetArchitecture(arch.ArchitectureType(oldArch))
arch.SetArchitecture("non-existing-architecture")
s.makeFakeGrubEFINativeEnv(c, []byte(`this is
some random boot config`))
opts := &bootloader.Options{NoSlashBoot: true}
g := bootloader.NewGrub(s.rootdir, opts)
c.Assert(g, NotNil)
tg, ok := g.(bootloader.TrustedAssetsBootloader)
c.Assert(ok, Equals, true)
ta, err := tg.TrustedAssets()
c.Check(err, ErrorMatches, `cannot find grub assets for "non-existing-architecture"`)
c.Check(ta, HasLen, 0)
}
func (s *grubTestSuite) TestListManagedAssets(c *C) {
s.makeFakeGrubEFINativeEnv(c, []byte(`this is
some random boot config`))
opts := &bootloader.Options{NoSlashBoot: true}
g := bootloader.NewGrub(s.rootdir, opts)
c.Assert(g, NotNil)
tg, ok := g.(bootloader.TrustedAssetsBootloader)
c.Assert(ok, Equals, true)
c.Check(tg.ManagedAssets(), DeepEquals, []string{
"EFI/ubuntu/grub.cfg",
})
opts = &bootloader.Options{Role: bootloader.RoleRecovery}
tg = bootloader.NewGrub(s.rootdir, opts).(bootloader.TrustedAssetsBootloader)
c.Check(tg.ManagedAssets(), DeepEquals, []string{
"EFI/ubuntu/grub.cfg",
})
// as it called for the root fs rather than a mount point of a partition
// with boot assets
tg = bootloader.NewGrub(s.rootdir, nil).(bootloader.TrustedAssetsBootloader)
c.Check(tg.ManagedAssets(), DeepEquals, []string{
"boot/grub/grub.cfg",
})
}
func (s *grubTestSuite) TestRecoveryUpdateBootConfigNoEdition(c *C) {
// native EFI/ubuntu setup
s.makeFakeGrubEFINativeEnv(c, []byte("recovery boot script"))
opts := &bootloader.Options{Role: bootloader.RoleRecovery}
g := bootloader.NewGrub(s.rootdir, opts)
c.Assert(g, NotNil)
restore := assets.MockInternal("grub-recovery.cfg", []byte(`# Snapd-Boot-Config-Edition: 5
this is mocked grub-recovery.conf
`))
defer restore()
tg, ok := g.(bootloader.TrustedAssetsBootloader)
c.Assert(ok, Equals, true)
// install the recovery boot script
updated, err := tg.UpdateBootConfig()
c.Assert(err, IsNil)
c.Assert(updated, Equals, false)
c.Assert(filepath.Join(s.grubEFINativeDir(), "grub.cfg"), testutil.FileEquals, `recovery boot script`)
}
func (s *grubTestSuite) TestRecoveryUpdateBootConfigUpdates(c *C) {
// native EFI/ubuntu setup
s.makeFakeGrubEFINativeEnv(c, []byte(`# Snapd-Boot-Config-Edition: 1
recovery boot script`))
opts := &bootloader.Options{Role: bootloader.RoleRecovery}
g := bootloader.NewGrub(s.rootdir, opts)
c.Assert(g, NotNil)
restore := assets.MockInternal("grub-recovery.cfg", []byte(`# Snapd-Boot-Config-Edition: 3
this is mocked grub-recovery.conf
`))
defer restore()
restore = assets.MockInternal("grub.cfg", []byte(`# Snapd-Boot-Config-Edition: 4
this is mocked grub.conf
`))
defer restore()
tg, ok := g.(bootloader.TrustedAssetsBootloader)
c.Assert(ok, Equals, true)
// install the recovery boot script
updated, err := tg.UpdateBootConfig()
c.Assert(err, IsNil)
c.Assert(updated, Equals, true)
// the recovery boot asset was picked
c.Assert(filepath.Join(s.grubEFINativeDir(), "grub.cfg"), testutil.FileEquals, `# Snapd-Boot-Config-Edition: 3
this is mocked grub-recovery.conf
`)
}
func (s *grubTestSuite) testBootUpdateBootConfigUpdates(c *C, oldConfig, newConfig string, update bool) {
// native EFI/ubuntu setup
s.makeFakeGrubEFINativeEnv(c, []byte(oldConfig))
opts := &bootloader.Options{NoSlashBoot: true}
g := bootloader.NewGrub(s.rootdir, opts)
c.Assert(g, NotNil)
restore := assets.MockInternal("grub.cfg", []byte(newConfig))
defer restore()
tg, ok := g.(bootloader.TrustedAssetsBootloader)
c.Assert(ok, Equals, true)
updated, err := tg.UpdateBootConfig()
c.Assert(err, IsNil)
c.Assert(updated, Equals, update)
if update {
c.Assert(filepath.Join(s.grubEFINativeDir(), "grub.cfg"), testutil.FileEquals, newConfig)
} else {
c.Assert(filepath.Join(s.grubEFINativeDir(), "grub.cfg"), testutil.FileEquals, oldConfig)
}
}
func (s *grubTestSuite) TestNoSlashBootUpdateBootConfigNoUpdateWhenNotManaged(c *C) {
oldConfig := `not managed`
newConfig := `# Snapd-Boot-Config-Edition: 3
this update is not applied
`
// the current boot config is not managed, no update applied
const updateApplied = false
s.testBootUpdateBootConfigUpdates(c, oldConfig, newConfig, updateApplied)
}
func (s *grubTestSuite) TestNoSlashBootUpdateBootConfigUpdates(c *C) {
oldConfig := `# Snapd-Boot-Config-Edition: 2
boot script
`
// edition is higher, update is applied
newConfig := `# Snapd-Boot-Config-Edition: 3
this is updated grub.cfg
`
const updateApplied = true
s.testBootUpdateBootConfigUpdates(c, oldConfig, newConfig, updateApplied)
}
func (s *grubTestSuite) TestNoSlashBootUpdateBootConfigNoUpdate(c *C) {
oldConfig := `# Snapd-Boot-Config-Edition: 2
boot script
`
// edition is lower, no update is applied
newConfig := `# Snapd-Boot-Config-Edition: 1
this is updated grub.cfg
`
const updateApplied = false
s.testBootUpdateBootConfigUpdates(c, oldConfig, newConfig, updateApplied)
}
func (s *grubTestSuite) TestNoSlashBootUpdateBootConfigSameEdition(c *C) {
oldConfig := `# Snapd-Boot-Config-Edition: 1
boot script
`
// edition is equal, no update is applied
newConfig := `# Snapd-Boot-Config-Edition: 1
this is updated grub.cfg
`
const updateApplied = false
s.testBootUpdateBootConfigUpdates(c, oldConfig, newConfig, updateApplied)
}
func (s *grubTestSuite) TestBootUpdateBootConfigTrivialErr(c *C) {
if os.Geteuid() == 0 {
c.Skip("the test cannot be run by the root user")
}
oldConfig := `# Snapd-Boot-Config-Edition: 2
boot script
`
// edition is higher, update is applied
newConfig := `# Snapd-Boot-Config-Edition: 3
this is updated grub.cfg
`
// native EFI/ubuntu setup
s.makeFakeGrubEFINativeEnv(c, []byte(oldConfig))
restore := assets.MockInternal("grub.cfg", []byte(newConfig))
defer restore()
opts := &bootloader.Options{NoSlashBoot: true}
g := bootloader.NewGrub(s.rootdir, opts)
c.Assert(g, NotNil)
tg, ok := g.(bootloader.TrustedAssetsBootloader)
c.Assert(ok, Equals, true)
err := os.Chmod(s.grubEFINativeDir(), 0000)
c.Assert(err, IsNil)
defer os.Chmod(s.grubEFINativeDir(), 0755)
updated, err := tg.UpdateBootConfig()
c.Assert(err, ErrorMatches, "cannot load existing config asset: .*/EFI/ubuntu/grub.cfg: permission denied")
c.Assert(updated, Equals, false)
err = os.Chmod(s.grubEFINativeDir(), 0555)
c.Assert(err, IsNil)
c.Assert(filepath.Join(s.grubEFINativeDir(), "grub.cfg"), testutil.FileEquals, oldConfig)
// writing out new config fails
err = os.Chmod(s.grubEFINativeDir(), 0111)
c.Assert(err, IsNil)
updated, err = tg.UpdateBootConfig()
c.Assert(err, ErrorMatches, `open .*/EFI/ubuntu/grub.cfg\..+: permission denied`)
c.Assert(updated, Equals, false)
c.Assert(filepath.Join(s.grubEFINativeDir(), "grub.cfg"), testutil.FileEquals, oldConfig)
}
func (s *grubTestSuite) TestStaticCmdlineForGrubAsset(c *C) {
restore := assets.MockSnippetsForEdition("grub-asset:static-cmdline", []assets.ForEditions{
{FirstEdition: 2, Snippet: []byte(`static cmdline "with spaces"`)},
})
defer restore()
cmdline := bootloader.StaticCommandLineForGrubAssetEdition("grub-asset", 1)
c.Check(cmdline, Equals, ``)
cmdline = bootloader.StaticCommandLineForGrubAssetEdition("grub-asset", 2)
c.Check(cmdline, Equals, `static cmdline "with spaces"`)
cmdline = bootloader.StaticCommandLineForGrubAssetEdition("grub-asset", 4)
c.Check(cmdline, Equals, `static cmdline "with spaces"`)
}
func (s *grubTestSuite) TestCommandLineNotManaged(c *C) {
grubCfg := "boot script\n"
// native EFI/ubuntu setup
s.makeFakeGrubEFINativeEnv(c, []byte(grubCfg))
restore := assets.MockSnippetsForEdition("grub.cfg:static-cmdline", []assets.ForEditions{
{FirstEdition: 1, Snippet: []byte(`static=1`)},
{FirstEdition: 2, Snippet: []byte(`static=2`)},
})
defer restore()
restore = assets.MockSnippetsForEdition("grub-recovery.cfg:static-cmdline", []assets.ForEditions{
{FirstEdition: 1, Snippet: []byte(`static=1 recovery`)},
{FirstEdition: 2, Snippet: []byte(`static=2 recovery`)},
})
defer restore()
opts := &bootloader.Options{NoSlashBoot: true}
mg := bootloader.NewGrub(s.rootdir, opts).(bootloader.TrustedAssetsBootloader)
args, err := mg.CommandLine(bootloader.CommandLineComponents{
ModeArg: "snapd_recovery_mode=run",
ExtraArgs: "extra",
})
c.Assert(err, IsNil)
c.Check(args, Equals, "snapd_recovery_mode=run static=1 extra")
optsRecovery := &bootloader.Options{NoSlashBoot: true, Role: bootloader.RoleRecovery}
mgr := bootloader.NewGrub(s.rootdir, optsRecovery).(bootloader.TrustedAssetsBootloader)
args, err = mgr.CommandLine(bootloader.CommandLineComponents{
ModeArg: "snapd_recovery_mode=recover",
SystemArg: "snapd_recovery_system=1234",
ExtraArgs: "extra",
})
c.Assert(err, IsNil)
c.Check(args, Equals, "snapd_recovery_mode=recover snapd_recovery_system=1234 static=1 recovery extra")
}
func (s *grubTestSuite) TestCommandLineMocked(c *C) {
grubCfg := `# Snapd-Boot-Config-Edition: 2
boot script
`
staticCmdline := `arg1 foo=123 panic=-1 arg2="with spaces "`
staticCmdlineEdition3 := `edition=3 static args`
restore := assets.MockSnippetsForEdition("grub.cfg:static-cmdline", []assets.ForEditions{
{FirstEdition: 1, Snippet: []byte(staticCmdline)},
{FirstEdition: 3, Snippet: []byte(staticCmdlineEdition3)},
})
defer restore()
staticCmdlineRecovery := `recovery config panic=-1`
restore = assets.MockSnippetsForEdition("grub-recovery.cfg:static-cmdline", []assets.ForEditions{
{FirstEdition: 1, Snippet: []byte(staticCmdlineRecovery)},
})
defer restore()
// native EFI/ubuntu setup
s.makeFakeGrubEFINativeEnv(c, []byte(grubCfg))
optsNoSlashBoot := &bootloader.Options{NoSlashBoot: true}
g := bootloader.NewGrub(s.rootdir, optsNoSlashBoot)
c.Assert(g, NotNil)
tg, ok := g.(bootloader.TrustedAssetsBootloader)
c.Assert(ok, Equals, true)
extraArgs := `extra_arg=1 extra_foo=-1 panic=3 baz="more spaces"`
args, err := tg.CommandLine(bootloader.CommandLineComponents{
ModeArg: "snapd_recovery_mode=run",
ExtraArgs: extraArgs,
})
c.Assert(err, IsNil)
c.Check(args, Equals, `snapd_recovery_mode=run arg1 foo=123 panic=-1 arg2="with spaces " extra_arg=1 extra_foo=-1 panic=3 baz="more spaces"`)
// empty mode/system do not produce confusing results
args, err = tg.CommandLine(bootloader.CommandLineComponents{
ExtraArgs: extraArgs,
})
c.Assert(err, IsNil)
c.Check(args, Equals, `arg1 foo=123 panic=-1 arg2="with spaces " extra_arg=1 extra_foo=-1 panic=3 baz="more spaces"`)
// now check the recovery bootloader
optsRecovery := &bootloader.Options{NoSlashBoot: true, Role: bootloader.RoleRecovery}
mrg := bootloader.NewGrub(s.rootdir, optsRecovery).(bootloader.TrustedAssetsBootloader)
args, err = mrg.CommandLine(bootloader.CommandLineComponents{
ModeArg: "snapd_recovery_mode=recover",
SystemArg: "snapd_recovery_system=20200202",
ExtraArgs: extraArgs,
})
c.Assert(err, IsNil)
// static command line from recovery asset
c.Check(args, Equals, `snapd_recovery_mode=recover snapd_recovery_system=20200202 recovery config panic=-1 extra_arg=1 extra_foo=-1 panic=3 baz="more spaces"`)
// try with a different edition
grubCfg3 := `# Snapd-Boot-Config-Edition: 3
boot script
`
s.makeFakeGrubEFINativeEnv(c, []byte(grubCfg3))
tg = bootloader.NewGrub(s.rootdir, optsNoSlashBoot).(bootloader.TrustedAssetsBootloader)
c.Assert(g, NotNil)
extraArgs = `extra_arg=1`
args, err = tg.CommandLine(bootloader.CommandLineComponents{
ModeArg: "snapd_recovery_mode=run",
ExtraArgs: extraArgs,
})
c.Assert(err, IsNil)
c.Check(args, Equals, `snapd_recovery_mode=run edition=3 static args extra_arg=1`)
// full args set overrides static arguments
args, err = tg.CommandLine(bootloader.CommandLineComponents{
ModeArg: "snapd_recovery_mode=run",
FullArgs: "full for run mode",
})
c.Assert(err, IsNil)
c.Check(args, Equals, `snapd_recovery_mode=run full for run mode`)
args, err = mrg.CommandLine(bootloader.CommandLineComponents{
ModeArg: "snapd_recovery_mode=recover",
SystemArg: "snapd_recovery_system=20200202",
FullArgs: "full for recover mode",
})
c.Assert(err, IsNil)
c.Check(args, Equals, `snapd_recovery_mode=recover snapd_recovery_system=20200202 full for recover mode`)
}
func (s *grubTestSuite) TestCandidateCommandLineMocked(c *C) {
grubCfg := `# Snapd-Boot-Config-Edition: 1
boot script
`
// edition on disk
s.makeFakeGrubEFINativeEnv(c, []byte(grubCfg))
edition2 := []byte(`# Snapd-Boot-Config-Edition: 2`)
edition3 := []byte(`# Snapd-Boot-Config-Edition: 3`)
edition4 := []byte(`# Snapd-Boot-Config-Edition: 4`)
restore := assets.MockInternal("grub.cfg", edition2)
defer restore()
restore = assets.MockInternal("grub-recovery.cfg", edition2)
defer restore()
restore = assets.MockSnippetsForEdition("grub.cfg:static-cmdline", []assets.ForEditions{
{FirstEdition: 1, Snippet: []byte(`edition=1`)},