github.com/hugh712/snapd@v0.0.0-20200910133618-1a99902bd583/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  const (
    65  	// DevMode switches confinement to non-enforcing mode.
    66  	patch1DevMode = 1 << iota
    67  	// TryMode is set for snaps installed to try directly from a local directory.
    68  	patch1TryMode
    69  )
    70  
    71  type patch1SnapSetup struct {
    72  	Name     string        `json:"name,omitempty"`
    73  	Revision snap.Revision `json:"revision,omitempty"`
    74  	Channel  string        `json:"channel,omitempty"`
    75  	UserID   int           `json:"user-id,omitempty"`
    76  
    77  	Flags patch1Flags `json:"flags,omitempty"`
    78  
    79  	SnapPath string `json:"snap-path,omitempty"`
    80  }
    81  
    82  type patch1SnapState struct {
    83  	SnapType  string            `json:"type"`
    84  	Sequence  []*patch1SideInfo `json:"sequence"`
    85  	Current   snap.Revision     `json:"current"`
    86  	Candidate *patch1SideInfo   `json:"candidate,omitempty"`
    87  	Active    bool              `json:"active,omitempty"`
    88  	Channel   string            `json:"channel,omitempty"`
    89  	Flags     patch1Flags       `json:"flags,omitempty"`
    90  	// incremented revision used for local installs
    91  	LocalRevision snap.Revision `json:"local-revision,omitempty"`
    92  }
    93  
    94  // patch1 adds the snap type and the current revision to the snap state.
    95  func patch1(s *state.State) error {
    96  	var stateMap map[string]*patch1SnapState
    97  
    98  	err := s.Get("snaps", &stateMap)
    99  	if err == state.ErrNoState {
   100  		return nil
   101  	}
   102  	if err != nil {
   103  		return err
   104  	}
   105  
   106  	for snapName, snapst := range stateMap {
   107  		seq := snapst.Sequence
   108  		if len(seq) == 0 {
   109  			continue
   110  		}
   111  		snapst.Current = seq[len(seq)-1].Revision
   112  		typ, err := patch1ReadType(snapName, snapst.Current)
   113  		if err != nil {
   114  			logger.Noticef("Recording type for snap %q: cannot retrieve info, assuming it's a app: %v", snapName, err)
   115  		} else {
   116  			logger.Noticef("Recording type for snap %q: setting to %q", snapName, typ)
   117  		}
   118  		snapst.SnapType = string(typ)
   119  	}
   120  
   121  	s.Set("snaps", stateMap)
   122  	return nil
   123  }