github.com/stolowski/snapd@v0.0.0-20210407085831-115137ce5a22/overlord/configstate/configcore/picfg.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 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 configcore
    21  
    22  import (
    23  	"fmt"
    24  	"os"
    25  	"path/filepath"
    26  	"strings"
    27  
    28  	"github.com/snapcore/snapd/dirs"
    29  	"github.com/snapcore/snapd/osutil"
    30  	"github.com/snapcore/snapd/overlord/configstate/config"
    31  )
    32  
    33  // valid pi config keys
    34  var piConfigKeys = map[string]bool{
    35  	"disable_overscan":         true,
    36  	"force_turbo":              true,
    37  	"framebuffer_width":        true,
    38  	"framebuffer_height":       true,
    39  	"framebuffer_depth":        true,
    40  	"framebuffer_ignore_alpha": true,
    41  	"overscan_left":            true,
    42  	"overscan_right":           true,
    43  	"overscan_top":             true,
    44  	"overscan_bottom":          true,
    45  	"overscan_scale":           true,
    46  	"display_rotate":           true,
    47  	"hdmi_cvt":                 true,
    48  	"hdmi_group":               true,
    49  	"hdmi_mode":                true,
    50  	"hdmi_timings":             true,
    51  	"hdmi_drive":               true,
    52  	"avoid_warnings":           true,
    53  	"gpu_mem_256":              true,
    54  	"gpu_mem_512":              true,
    55  	"gpu_mem":                  true,
    56  	"sdtv_aspect":              true,
    57  	"config_hdmi_boost":        true,
    58  	"hdmi_force_hotplug":       true,
    59  	"start_x":                  true,
    60  }
    61  
    62  func init() {
    63  	// add supported config keys
    64  	for k := range piConfigKeys {
    65  		s := fmt.Sprintf("core.pi-config.%s", strings.Replace(k, "_", "-", -1))
    66  		supportedConfigurations[s] = true
    67  	}
    68  }
    69  
    70  func updatePiConfig(path string, config map[string]string) error {
    71  	f, err := os.Open(path)
    72  	if err != nil {
    73  		return err
    74  	}
    75  	defer f.Close()
    76  
    77  	toWrite, err := updateKeyValueStream(f, piConfigKeys, config)
    78  	if err != nil {
    79  		return err
    80  	}
    81  
    82  	if toWrite != nil {
    83  		s := strings.Join(toWrite, "\n")
    84  		// ensure we have a final newline in the file
    85  		s += "\n"
    86  		return osutil.AtomicWriteFile(path, []byte(s), 0644, 0)
    87  	}
    88  
    89  	return nil
    90  }
    91  
    92  func piConfigFile(opts *fsOnlyContext) string {
    93  	rootDir := dirs.GlobalRootDir
    94  	if opts != nil {
    95  		rootDir = opts.RootDir
    96  	}
    97  	return filepath.Join(rootDir, "/boot/uboot/config.txt")
    98  }
    99  
   100  func handlePiConfiguration(tr config.ConfGetter, opts *fsOnlyContext) error {
   101  	if osutil.FileExists(piConfigFile(opts)) {
   102  		// snapctl can actually give us the whole dict in
   103  		// JSON, in a single call; use that instead of this.
   104  		config := map[string]string{}
   105  		for key := range piConfigKeys {
   106  			output, err := coreCfg(tr, fmt.Sprintf("pi-config.%s", strings.Replace(key, "_", "-", -1)))
   107  			if err != nil {
   108  				return err
   109  			}
   110  			config[key] = output
   111  		}
   112  		if err := updatePiConfig(piConfigFile(opts), config); err != nil {
   113  			return err
   114  		}
   115  	}
   116  	return nil
   117  }