github.com/Lephar/snapd@v0.0.0-20210825215435-c7fba9cef4d2/systemd/systemdtest/systemdtest.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2021 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 systemdtest
    21  
    22  import (
    23  	"fmt"
    24  
    25  	"github.com/snapcore/snapd/osutil"
    26  )
    27  
    28  type ServiceState struct {
    29  	ActiveState   string
    30  	UnitFileState string
    31  }
    32  
    33  // HandleMockAllUnitsActiveOutput returns the output for systemctl in the case
    34  // where units have the state as described by states.
    35  // If `cmd` is the command issued by systemd.Status(), this function returns
    36  // the output to be produced by the command so that the queried services will
    37  // appear having the ActiveState and UnitFileState according to the data
    38  // passed in the `states` map.
    39  func HandleMockAllUnitsActiveOutput(cmd []string, states map[string]ServiceState) []byte {
    40  	osutil.MustBeTestBinary("mocking systemctl output can only be done from tests")
    41  	if cmd[0] != "show" ||
    42  		cmd[1] != "--property=Id,ActiveState,UnitFileState,Type" {
    43  		return nil
    44  	}
    45  	var output []byte
    46  	for _, unit := range cmd[2:] {
    47  		if len(output) > 0 {
    48  			output = append(output, byte('\n'))
    49  		}
    50  		state, ok := states[unit]
    51  		if !ok {
    52  			state = ServiceState{"active", "enabled"}
    53  		}
    54  		output = append(output, []byte(fmt.Sprintf(`Id=%s
    55  ActiveState=%s
    56  UnitFileState=%s
    57  Type=simple
    58  `, unit, state.ActiveState, state.UnitFileState))...)
    59  	}
    60  	return output
    61  }