src/login/sysfs-show.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright 2010 Lennart Poettering
   4 ***/
   5
   6 #include <errno.h>
   7 #include <string.h>
   8
   9 #if 0 /// elogind needs the systems udev header
  10 #include "libudev.h"
  11 #else
  12 #include <libudev.h>
  13 #endif // 0
  14
  15 #include "alloc-util.h"
  16 #include "locale-util.h"
  17 #include "path-util.h"
  18 #include "string-util.h"
  19 #include "sysfs-show.h"
  20 #include "terminal-util.h"
  21 #include "udev-util.h"
  22 #include "util.h"
  23
  24 static int show_sysfs_one(
  25                 struct udev *udev,
  26                 const char *seat,
  27                 struct udev_list_entry **item,
  28                 const char *sub,
  29                 const char *prefix,
  30                 unsigned n_columns,
  31                 OutputFlags flags) {
  32
  33         size_t max_width;
  34
  35         assert(udev);
  36         assert(seat);
  37         assert(item);
  38         assert(prefix);
  39
  40         if (flags & OUTPUT_FULL_WIDTH)
  41                 max_width = (size_t) -1;
  42         else if (n_columns < 10)
  43                 max_width = 10;
  44         else
  45                 max_width = n_columns;
  46
  47         while (*item) {
  48                 _cleanup_(udev_device_unrefp) struct udev_device *d = NULL;
  49                 struct udev_list_entry *next, *lookahead;
  50                 const char *sn, *name, *sysfs, *subsystem, *sysname;
  51                 _cleanup_free_ char *k = NULL, *l = NULL;
  52                 bool is_master;
  53
  54                 sysfs = udev_list_entry_get_name(*item);
  55                 if (!path_startswith(sysfs, sub))
  56                         return 0;
  57
  58                 d = udev_device_new_from_syspath(udev, sysfs);
  59                 if (!d) {
  60                         *item = udev_list_entry_get_next(*item);
  61                         continue;
  62                 }
  63
  64                 sn = udev_device_get_property_value(d, "ID_SEAT");
  65                 if (isempty(sn))
  66                         sn = "seat0";
  67
  68                 /* Explicitly also check for tag 'seat' here */
  69                 if (!streq(seat, sn) || !udev_device_has_tag(d, "seat")) {
  70                         *item = udev_list_entry_get_next(*item);
  71                         continue;
  72                 }
  73
  74                 is_master = udev_device_has_tag(d, "master-of-seat");
  75
  76                 name = udev_device_get_sysattr_value(d, "name");
  77                 if (!name)
  78                         name = udev_device_get_sysattr_value(d, "id");
  79                 subsystem = udev_device_get_subsystem(d);
  80                 sysname = udev_device_get_sysname(d);
  81
  82                 /* Look if there's more coming after this */
  83                 lookahead = next = udev_list_entry_get_next(*item);
  84                 while (lookahead) {
  85                         const char *lookahead_sysfs;
  86
  87                         lookahead_sysfs = udev_list_entry_get_name(lookahead);
  88
  89                         if (path_startswith(lookahead_sysfs, sub) &&
  90                             !path_startswith(lookahead_sysfs, sysfs)) {
  91                                 _cleanup_(udev_device_unrefp) struct udev_device *lookahead_d = NULL;
  92
  93                                 lookahead_d = udev_device_new_from_syspath(udev, lookahead_sysfs);
  94                                 if (lookahead_d) {
  95                                         const char *lookahead_sn;
  96
  97                                         lookahead_sn = udev_device_get_property_value(d, "ID_SEAT");
  98                                         if (isempty(lookahead_sn))
  99                                                 lookahead_sn = "seat0";
 100
 101                                         if (streq(seat, lookahead_sn) && udev_device_has_tag(lookahead_d, "seat"))
 102                                                 break;
 103                                 }
 104                         }
 105
 106                         lookahead = udev_list_entry_get_next(lookahead);
 107                 }
 108
 109                 k = ellipsize(sysfs, max_width, 20);
 110                 if (!k)
 111                         return -ENOMEM;
 112
 113                 printf("%s%s%s\n", prefix, special_glyph(lookahead ? TREE_BRANCH : TREE_RIGHT), k);
 114
 115                 if (asprintf(&l,
 116                              "%s%s:%s%s%s%s",
 117                              is_master ? "[MASTER] " : "",
 118                              subsystem, sysname,
 119                              name ? " \"" : "", strempty(name), name ? "\"" : "") < 0)
 120                         return -ENOMEM;
 121
 122                 free(k);
 123                 k = ellipsize(l, max_width, 70);
 124                 if (!k)
 125                         return -ENOMEM;
 126
 127                 printf("%s%s%s\n", prefix, lookahead ? special_glyph(TREE_VERTICAL) : "  ", k);
 128
 129                 *item = next;
 130                 if (*item) {
 131                         _cleanup_free_ char *p = NULL;
 132
 133                         p = strappend(prefix, lookahead ? special_glyph(TREE_VERTICAL) : "  ");
 134                         if (!p)
 135                                 return -ENOMEM;
 136
 137                         show_sysfs_one(udev, seat, item, sysfs, p,
 138                                        n_columns == (unsigned) -1 || n_columns < 2 ? n_columns : n_columns - 2,
 139                                        flags);
 140                 }
 141         }
 142
 143         return 0;
 144 }
 145
 146 int show_sysfs(const char *seat, const char *prefix, unsigned n_columns, OutputFlags flags) {
 147         _cleanup_(udev_enumerate_unrefp) struct udev_enumerate *e = NULL;
 148         _cleanup_(udev_unrefp) struct udev *udev = NULL;
 149         struct udev_list_entry *first = NULL;
 150         int r;
 151
 152         if (n_columns <= 0)
 153                 n_columns = columns();
 154
 155         prefix = strempty(prefix);
 156
 157         if (isempty(seat))
 158                 seat = "seat0";
 159
 160         udev = udev_new();
 161         if (!udev)
 162                 return -ENOMEM;
 163
 164         e = udev_enumerate_new(udev);
 165         if (!e)
 166                 return -ENOMEM;
 167
 168         if (!streq(seat, "seat0"))
 169                 r = udev_enumerate_add_match_tag(e, seat);
 170         else
 171                 r = udev_enumerate_add_match_tag(e, "seat");
 172         if (r < 0)
 173                 return r;
 174
 175         r = udev_enumerate_add_match_is_initialized(e);
 176         if (r < 0)
 177                 return r;
 178
 179         r = udev_enumerate_scan_devices(e);
 180         if (r < 0)
 181                 return r;
 182
 183         first = udev_enumerate_get_list_entry(e);
 184         if (first)
 185                 show_sysfs_one(udev, seat, &first, "/", prefix, n_columns, flags);
 186         else
 187                 printf("%s%s%s\n", prefix, special_glyph(TREE_RIGHT), "(none)");
 188
 189         return r;
 190 }