/
options20.go
123 lines (105 loc) · 3.41 KB
/
options20.go
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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 internal
import (
"fmt"
"io/ioutil"
"strings"
"gopkg.in/yaml.v2"
"github.com/snapcore/snapd/osutil"
"github.com/snapcore/snapd/snap/channel"
"github.com/snapcore/snapd/snap/naming"
)
// Snap20 carries options for a model snap or an extra snap
// in grade: dangerous.
type Snap20 struct {
Name string `yaml:"name"`
// id and unasserted can be both set, in which case it only
// cross-references the model
SnapID string `yaml:"id,omitempty"`
// Unasserted has the filename for an unasserted local snap
Unasserted string `yaml:"unasserted,omitempty"`
Channel string `yaml:"channel,omitempty"`
// TODO: DevMode bool `yaml:"devmode,omitempty"`
}
// SnapName implements naming.SnapRef.
func (sn *Snap20) SnapName() string {
return sn.Name
}
// ID implements naming.SnapRef.
func (sn *Snap20) ID() string {
return sn.SnapID
}
type Options20 struct {
Snaps []*Snap20 `yaml:"snaps"`
}
func ReadOptions20(optionsFn string) (*Options20, error) {
errPrefix := "cannot read grade dangerous options yaml"
yamlData, err := ioutil.ReadFile(optionsFn)
if err != nil {
return nil, fmt.Errorf("%s: %v", errPrefix, err)
}
var options Options20
if err := yaml.Unmarshal(yamlData, &options); err != nil {
return nil, fmt.Errorf("%s: cannot unmarshal %q: %s", errPrefix, yamlData, err)
}
seenNames := make(map[string]bool, len(options.Snaps))
// validate
for _, sn := range options.Snaps {
if sn == nil {
return nil, fmt.Errorf("%s: empty snaps element", errPrefix)
}
// TODO: check if it's a parallel install explicitly,
// need to move *Instance* helpers from snap to naming
if err := naming.ValidateSnap(sn.Name); err != nil {
return nil, fmt.Errorf("%s: %v", errPrefix, err)
}
if sn.SnapID == "" && sn.Channel == "" && sn.Unasserted == "" {
return nil, fmt.Errorf("%s: at least one of id, channel or unasserted must be set for snap %q", errPrefix, sn.Name)
}
if sn.SnapID != "" {
if err := naming.ValidateSnapID(sn.SnapID); err != nil {
return nil, fmt.Errorf("%s: %v", errPrefix, err)
}
}
if sn.Channel != "" {
if _, err := channel.Parse(sn.Channel, ""); err != nil {
return nil, fmt.Errorf("%s: %v", errPrefix, err)
}
}
if sn.Unasserted != "" && strings.Contains(sn.Unasserted, "/") {
return nil, fmt.Errorf("%s: %q must be a filename, not a path", errPrefix, sn.Unasserted)
}
// make sure names and file names are unique
if seenNames[sn.Name] {
return nil, fmt.Errorf("%s: snap name %q must be unique", errPrefix, sn.Name)
}
seenNames[sn.Name] = true
}
return &options, nil
}
func (options *Options20) Write(optionsFn string) error {
data, err := yaml.Marshal(options)
if err != nil {
return err
}
if err := osutil.AtomicWriteFile(optionsFn, data, 0644, 0); err != nil {
return err
}
return nil
}