mirror of
https://github.com/token2/snapd.git
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79c5ac14b2
* many: remove usages of deprecated io/ioutil package Signed-off-by: Miguel Pires <miguel.pires@canonical.com> * .golangci.yml: remove errcheck ignore rule for io/ioutil Signed-off-by: Miguel Pires <miguel.pires@canonical.com> * run-checks: prevent new usages of io/ioutil Signed-off-by: Miguel Pires <miguel.pires@canonical.com> --------- Signed-off-by: Miguel Pires <miguel.pires@canonical.com>
116 lines
3.5 KiB
Go
116 lines
3.5 KiB
Go
// -*- Mode: Go; indent-tabs-mode: t -*-
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//go:build withbootassetstesting
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/*
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* Copyright (C) 2021 Canonical Ltd
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 3 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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package bootloader
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import (
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"bytes"
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"github.com/snapcore/snapd/bootloader/assets"
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"github.com/snapcore/snapd/logger"
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"github.com/snapcore/snapd/snapdenv"
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)
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var maybeInjectOsReadlink = os.Readlink
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func MockMaybeInjectOsReadlink(m func(string) (string, error)) (restore func()) {
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old := maybeInjectOsReadlink
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maybeInjectOsReadlink = m
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return func() {
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maybeInjectOsReadlink = old
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}
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}
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func MaybeInjectTestingBootloaderAssets() {
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// this code is ran only when snapd is built with specific testing tag
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if !snapdenv.Testing() {
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return
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}
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// log an info level message, it is a testing build of snapd anyway
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logger.Noticef("maybe inject boot assets?")
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// is there a marker file at /usr/lib/snapd/ in the snap?
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selfExe, err := maybeInjectOsReadlink("/proc/self/exe")
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if err != nil {
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panic(fmt.Sprintf("cannot readlink: %v", err))
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}
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injectPieceRaw, err := os.ReadFile(filepath.Join(filepath.Dir(selfExe), "bootassetstesting"))
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if os.IsNotExist(err) {
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logger.Noticef("no boot asset testing marker")
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return
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}
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if len(injectPieceRaw) == 0 {
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logger.Noticef("boot asset testing snippet is empty")
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}
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injectPiece := strings.TrimSpace(string(injectPieceRaw))
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// with boot assets testing enabled and the marker file present, inject
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// a mock boot config update
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grubBootconfig := assets.Internal("grub.cfg")
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if grubBootconfig == nil {
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panic("no bootconfig")
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}
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snippets := assets.SnippetsForEditions("grub.cfg:static-cmdline")
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if len(snippets) == 0 {
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panic(fmt.Sprintf("cannot obtain internal grub.cfg:static-cmdline snippets"))
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}
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internalEdition, err := editionFromConfigAsset(bytes.NewReader(grubBootconfig))
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if err != nil {
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panic(fmt.Sprintf("cannot inject boot config for asset: %v", err))
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}
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// bump the injected edition number
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injectedEdition := internalEdition + 1
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logger.Noticef("injecting grub boot assets for testing, edition: %v snippet: %q", injectedEdition, injectPiece)
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lastSnippet := string(snippets[len(snippets)-1].Snippet)
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injectedSnippet := lastSnippet + " " + injectPiece
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injectedSnippets := append(snippets,
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assets.ForEditions{FirstEdition: injectedEdition, Snippet: []byte(injectedSnippet)})
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assets.InjectSnippetsForEditions("grub.cfg:static-cmdline", injectedSnippets)
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origGrubBoot := string(grubBootconfig)
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bumpedEdition := strings.Replace(origGrubBoot,
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fmt.Sprintf("%s%d", editionHeader, internalEdition),
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fmt.Sprintf("%s%d", editionHeader, injectedEdition),
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1)
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// see data/grub.cfg for reference
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bumpedCmdlineAndEdition := strings.Replace(bumpedEdition,
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fmt.Sprintf(`set snapd_static_cmdline_args='%s'`, lastSnippet),
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fmt.Sprintf(`set snapd_static_cmdline_args='%s'`, injectedSnippet),
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1)
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assets.InjectInternal("grub.cfg", []byte(bumpedCmdlineAndEdition))
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}
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func init() {
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MaybeInjectTestingBootloaderAssets()
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}
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