github.com/Lephar/snapd@v0.0.0-20210825215435-c7fba9cef4d2/overlord/snapstate/backend/fontconfig.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2018 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 backend
    21  
    22  import (
    23  	"fmt"
    24  
    25  	"github.com/snapcore/snapd/osutil"
    26  	"github.com/snapcore/snapd/snapdtool"
    27  )
    28  
    29  var updateFontconfigCaches = updateFontconfigCachesImpl
    30  var commandFromSystemSnap = snapdtool.CommandFromSystemSnap
    31  
    32  // updateFontconfigCaches always update the fontconfig caches
    33  func updateFontconfigCachesImpl() error {
    34  	for _, fc := range []string{"fc-cache-v6", "fc-cache-v7"} {
    35  		cmd, err := commandFromSystemSnap("/bin/"+fc, "--system-only")
    36  		if err != nil {
    37  			return fmt.Errorf("cannot get %s from core: %v", fc, err)
    38  		}
    39  		if output, err := cmd.CombinedOutput(); err != nil {
    40  			return fmt.Errorf("cannot run %s on core: %v", fc, osutil.OutputErr(output, err))
    41  		}
    42  	}
    43  	return nil
    44  }