github.com/Lephar/snapd@v0.0.0-20210825215435-c7fba9cef4d2/overlord/configstate/configmgr.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2016-2017 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 configstate
    21  
    22  import (
    23  	"regexp"
    24  
    25  	"github.com/snapcore/snapd/overlord/configstate/config"
    26  	"github.com/snapcore/snapd/overlord/configstate/configcore"
    27  	"github.com/snapcore/snapd/overlord/hookstate"
    28  	"github.com/snapcore/snapd/overlord/snapstate"
    29  	"github.com/snapcore/snapd/overlord/state"
    30  	"github.com/snapcore/snapd/sysconfig"
    31  )
    32  
    33  var configcoreRun = configcore.Run
    34  
    35  func MockConfigcoreRun(f func(sysconfig.Device, config.Conf) error) (restore func()) {
    36  	origConfigcoreRun := configcoreRun
    37  	configcoreRun = f
    38  	return func() {
    39  		configcoreRun = origConfigcoreRun
    40  	}
    41  }
    42  
    43  func Init(st *state.State, hookManager *hookstate.HookManager) error {
    44  	delayedCrossMgrInit()
    45  
    46  	// Most configuration is handled via the "configure" hook of the
    47  	// snaps. However some configuration is internally handled
    48  	hookManager.Register(regexp.MustCompile("^configure$"), newConfigureHandler)
    49  	// Ensure that we run configure for the core snap internally.
    50  	// Note that we use the func() indirection so that mocking configcoreRun
    51  	// in tests works correctly.
    52  	hookManager.RegisterHijack("configure", "core", func(ctx *hookstate.Context) error {
    53  		dev, tr, err := func() (sysconfig.Device, config.Conf, error) {
    54  			ctx.Lock()
    55  			defer ctx.Unlock()
    56  			task, _ := ctx.Task()
    57  			dev, err := snapstate.DeviceCtx(ctx.State(), task, nil)
    58  			if err != nil {
    59  				return nil, nil, err
    60  			}
    61  			return dev, ContextTransaction(ctx), nil
    62  		}()
    63  		if err != nil {
    64  			return err
    65  		}
    66  		return configcoreRun(dev, tr)
    67  	})
    68  
    69  	return nil
    70  }