mirror of
https://github.com/token2/snapd.git
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80 lines
2.2 KiB
Go
80 lines
2.2 KiB
Go
// -*- Mode: Go; indent-tabs-mode: t -*-
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/*
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* Copyright (C) 2020 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 kernel
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"regexp"
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"gopkg.in/yaml.v2"
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)
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type Asset struct {
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// TODO: we may make this an (optional) map at some point in
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// the future to select what things should be updated.
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//
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// Update set to true indicates that assets shall be updated.
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Update bool `yaml:"update,omitempty"`
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Content []string `yaml:"content,omitempty"`
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}
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type Info struct {
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Assets map[string]*Asset `yaml:"assets,omitempty"`
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}
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// ValidAssetName is a regular expression matching valid asset name.
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var ValidAssetName = regexp.MustCompile("^[a-zA-Z0-9][a-zA-Z0-9-]*$")
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// InfoFromKernelYaml reads the provided kernel metadata.
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func InfoFromKernelYaml(kernelYaml []byte) (*Info, error) {
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var ki Info
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if err := yaml.Unmarshal(kernelYaml, &ki); err != nil {
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return nil, fmt.Errorf("cannot parse kernel metadata: %v", err)
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}
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for name := range ki.Assets {
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if !ValidAssetName.MatchString(name) {
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return nil, fmt.Errorf("invalid asset name %q, please use only alphanumeric characters and dashes", name)
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}
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}
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return &ki, nil
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}
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// ReadInfo reads the kernel specific metadata from meta/kernel.yaml
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// in the snap root directory if the file exists.
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func ReadInfo(kernelSnapRootDir string) (*Info, error) {
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p := filepath.Join(kernelSnapRootDir, "meta", "kernel.yaml")
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content, err := ioutil.ReadFile(p)
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// meta/kernel.yaml is optional so we should not error here if
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// it is missing
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if os.IsNotExist(err) {
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return &Info{}, nil
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}
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if err != nil {
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return nil, fmt.Errorf("cannot read kernel info: %v", err)
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}
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return InfoFromKernelYaml(content)
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}
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