github.com/david-imola/snapd@v0.0.0-20210611180407-2de8ddeece6d/overlord/patch/patch1.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2016 Canonical Ltd
     5   *
     6   * This program is free software: you can redistribute it and/or modify
     7   * it under the terms of the GNU General Public License version 3 as
     8   * published by the Free Software Foundation.
     9   *
    10   * This program is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU General Public License for more details.
    14   *
    15   * You should have received a copy of the GNU General Public License
    16   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17   *
    18   */
    19  
    20  package patch
    21  
    22  import (
    23  	"io/ioutil"
    24  	"path/filepath"
    25  
    26  	"github.com/snapcore/snapd/logger"
    27  	"github.com/snapcore/snapd/overlord/state"
    28  	"github.com/snapcore/snapd/snap"
    29  )
    30  
    31  func init() {
    32  	patches[1] = []PatchFunc{patch1}
    33  }
    34  
    35  type patch1SideInfo struct {
    36  	OfficialName      string        `yaml:"name,omitempty" json:"name,omitempty"`
    37  	SnapID            string        `yaml:"snap-id" json:"snap-id"`
    38  	Revision          snap.Revision `yaml:"revision" json:"revision"`
    39  	Channel           string        `yaml:"channel,omitempty" json:"channel,omitempty"`
    40  	Developer         string        `yaml:"developer,omitempty" json:"developer,omitempty"`
    41  	EditedSummary     string        `yaml:"summary,omitempty" json:"summary,omitempty"`
    42  	EditedDescription string        `yaml:"description,omitempty" json:"description,omitempty"`
    43  	Size              int64         `yaml:"size,omitempty" json:"size,omitempty"`
    44  	Sha512            string        `yaml:"sha512,omitempty" json:"sha512,omitempty"`
    45  	Private           bool          `yaml:"private,omitempty" json:"private,omitempty"`
    46  }
    47  
    48  var patch1ReadType = func(name string, rev snap.Revision) (snap.Type, error) {
    49  	snapYamlFn := filepath.Join(snap.MountDir(name, rev), "meta", "snap.yaml")
    50  	meta, err := ioutil.ReadFile(snapYamlFn)
    51  	if err != nil {
    52  		return snap.TypeApp, err
    53  	}
    54  	info, err := snap.InfoFromSnapYaml(meta)
    55  	if err != nil {
    56  		return snap.TypeApp, err
    57  	}
    58  
    59  	return info.Type(), nil
    60  }
    61  
    62  type patch1Flags int
    63  
    64  type patch1SnapSetup struct {
    65  	Name     string        `json:"name,omitempty"`
    66  	Revision snap.Revision `json:"revision,omitempty"`
    67  	Channel  string        `json:"channel,omitempty"`
    68  	UserID   int           `json:"user-id,omitempty"`
    69  
    70  	Flags patch1Flags `json:"flags,omitempty"`
    71  
    72  	SnapPath string `json:"snap-path,omitempty"`
    73  }
    74  
    75  type patch1SnapState struct {
    76  	SnapType  string            `json:"type"`
    77  	Sequence  []*patch1SideInfo `json:"sequence"`
    78  	Current   snap.Revision     `json:"current"`
    79  	Candidate *patch1SideInfo   `json:"candidate,omitempty"`
    80  	Active    bool              `json:"active,omitempty"`
    81  	Channel   string            `json:"channel,omitempty"`
    82  	Flags     patch1Flags       `json:"flags,omitempty"`
    83  	// incremented revision used for local installs
    84  	LocalRevision snap.Revision `json:"local-revision,omitempty"`
    85  }
    86  
    87  // patch1 adds the snap type and the current revision to the snap state.
    88  func patch1(s *state.State) error {
    89  	var stateMap map[string]*patch1SnapState
    90  
    91  	err := s.Get("snaps", &stateMap)
    92  	if err == state.ErrNoState {
    93  		return nil
    94  	}
    95  	if err != nil {
    96  		return err
    97  	}
    98  
    99  	for snapName, snapst := range stateMap {
   100  		seq := snapst.Sequence
   101  		if len(seq) == 0 {
   102  			continue
   103  		}
   104  		snapst.Current = seq[len(seq)-1].Revision
   105  		typ, err := patch1ReadType(snapName, snapst.Current)
   106  		if err != nil {
   107  			logger.Noticef("Recording type for snap %q: cannot retrieve info, assuming it's a app: %v", snapName, err)
   108  		} else {
   109  			logger.Noticef("Recording type for snap %q: setting to %q", snapName, typ)
   110  		}
   111  		snapst.SnapType = string(typ)
   112  	}
   113  
   114  	s.Set("snaps", stateMap)
   115  	return nil
   116  }