forked from snapcore/snapd
/
seed_yaml.go
120 lines (99 loc) · 3.23 KB
/
seed_yaml.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2014-2016 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 seed
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"
)
// Snap points to a snap in the seed to install, together with
// assertions (or alone if unasserted is true) it will be used to
// drive the installation and ultimately set SideInfo/SnapState for it.
// TODO: make this internal
type Snap16 struct {
Name string `yaml:"name"`
// cross-reference/audit
SnapID string `yaml:"snap-id,omitempty"`
// bits that are orthongonal/not in assertions
Channel string `yaml:"channel,omitempty"`
DevMode bool `yaml:"devmode,omitempty"`
Classic bool `yaml:"classic,omitempty"`
Private bool `yaml:"private,omitempty"`
Contact string `yaml:"contact,omitempty"`
// no assertions are available in the seed for this snap
Unasserted bool `yaml:"unasserted,omitempty"`
File string `yaml:"file"`
}
// TODO: make all of this internal only
type Seed16 struct {
Snaps []*Snap16 `yaml:"snaps"`
}
func ReadYaml(fn string) (*Seed16, error) {
errPrefix := "cannot read seed yaml"
yamlData, err := ioutil.ReadFile(fn)
if err != nil {
return nil, fmt.Errorf("%s: %v", errPrefix, err)
}
var seed Seed16
if err := yaml.Unmarshal(yamlData, &seed); err != nil {
return nil, fmt.Errorf("%s: cannot unmarshal %q: %s", errPrefix, yamlData, err)
}
seenNames := make(map[string]bool, len(seed.Snaps))
// validate
for _, sn := range seed.Snaps {
if sn == nil {
return nil, fmt.Errorf("%s: empty element in seed", 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.Channel != "" {
if _, err := channel.Parse(sn.Channel, ""); err != nil {
return nil, fmt.Errorf("%s: %v", errPrefix, err)
}
}
if sn.File == "" {
return nil, fmt.Errorf(`%s: "file" attribute for %q cannot be empty`, errPrefix, sn.Name)
}
if strings.Contains(sn.File, "/") {
return nil, fmt.Errorf("%s: %q must be a filename, not a path", errPrefix, sn.File)
}
// 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 &seed, nil
}
func (seed *Seed16) Write(seedFn string) error {
data, err := yaml.Marshal(&seed)
if err != nil {
return err
}
if err := osutil.AtomicWriteFile(seedFn, data, 0644, 0); err != nil {
return err
}
return nil
}