github.com/david-imola/snapd@v0.0.0-20210611180407-2de8ddeece6d/overlord/patch/patch6_3.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2019 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  	"encoding/json"
    24  	"fmt"
    25  
    26  	"github.com/snapcore/snapd/logger"
    27  	"github.com/snapcore/snapd/overlord/state"
    28  	"github.com/snapcore/snapd/snap/channel"
    29  )
    30  
    31  // normChan will take a potentially unclean channel from the state
    32  // (with leading or trailing extra "/") and return a cleaned version.
    33  func normChan(in string) string {
    34  	out, err := channel.Full(in)
    35  	if err != nil {
    36  		logger.Noticef("cannot parse channel string %q: %v", in, err)
    37  		return in
    38  	}
    39  	return out
    40  }
    41  
    42  // patch6_3:
    43  //  - ensure channel spec is valid
    44  func patch6_3(st *state.State) error {
    45  	var snaps map[string]*json.RawMessage
    46  	if err := st.Get("snaps", &snaps); err != nil && err != state.ErrNoState {
    47  		return fmt.Errorf("internal error: cannot get snaps: %s", err)
    48  	}
    49  
    50  	// Migrate snapstate
    51  	dirty := false
    52  	for name, raw := range snaps {
    53  		var snapst map[string]interface{}
    54  		if err := json.Unmarshal([]byte(*raw), &snapst); err != nil {
    55  			return err
    56  		}
    57  		ch, _ := snapst["channel"].(string)
    58  		if ch != "" {
    59  			normed := normChan(ch)
    60  			if normed != ch {
    61  				snapst["channel"] = normed
    62  				data, err := json.Marshal(snapst)
    63  				if err != nil {
    64  					return err
    65  				}
    66  				newRaw := json.RawMessage(data)
    67  				snaps[name] = &newRaw
    68  				dirty = true
    69  			}
    70  		}
    71  	}
    72  	if dirty {
    73  		st.Set("snaps", snaps)
    74  	}
    75  
    76  	// migrate tasks' snap setup
    77  	for _, task := range st.Tasks() {
    78  		chg := task.Change()
    79  		if chg != nil && chg.Status().Ready() {
    80  			continue
    81  		}
    82  
    83  		// check task snap-setup
    84  		var snapsup map[string]interface{}
    85  		err := task.Get("snap-setup", &snapsup)
    86  		if err != nil && err != state.ErrNoState {
    87  			return fmt.Errorf("internal error: cannot get snap-setup of task %s: %s", task.ID(), err)
    88  		}
    89  		if err == nil {
    90  			ch, _ := snapsup["channel"].(string)
    91  			if ch != "" {
    92  				normed := normChan(ch)
    93  				if normed != ch {
    94  					snapsup["channel"] = normed
    95  					task.Set("snap-setup", snapsup)
    96  				}
    97  			}
    98  		}
    99  		// check tasks "old-channel" data
   100  		var oldCh string
   101  		task.Get("old-channel", &oldCh)
   102  		if oldCh != "" {
   103  			normed := normChan(oldCh)
   104  			if normed != oldCh {
   105  				task.Set("old-channel", normed)
   106  			}
   107  		}
   108  	}
   109  
   110  	return nil
   111  }