src/login/sysfs-show.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <errno.h>
  21 #include <string.h>
  22
  23 #include "libudev.h"
  24
  25 #include "alloc-util.h"
  26 #include "locale-util.h"
  27 #include "path-util.h"
  28 #include "string-util.h"
  29 #include "sysfs-show.h"
  30 #include "terminal-util.h"
  31 #include "udev-util.h"
  32 #include "util.h"
  33
  34 static int show_sysfs_one(
  35                 struct udev *udev,
  36                 const char *seat,
  37                 struct udev_list_entry **item,
  38                 const char *sub,
  39                 const char *prefix,
  40                 unsigned n_columns) {
  41
  42         assert(udev);
  43         assert(seat);
  44         assert(item);
  45         assert(prefix);
  46
  47         while (*item) {
  48                 _cleanup_udev_device_unref_ 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_unref_ 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, n_columns, 20);
 110                 if (!k)
 111                         return -ENOMEM;
 112
 113                 printf("%s%s%s\n", prefix, draw_special_char(lookahead ? DRAW_TREE_BRANCH : DRAW_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, n_columns, 70);
 124                 if (!k)
 125                         return -ENOMEM;
 126
 127                 printf("%s%s%s\n", prefix, lookahead ? draw_special_char(DRAW_TREE_VERTICAL) : "  ", k);
 128
 129                 *item = next;
 130                 if (*item) {
 131                         _cleanup_free_ char *p = NULL;
 132
 133                         p = strappend(prefix, lookahead ? draw_special_char(DRAW_TREE_VERTICAL) : "  ");
 134                         if (!p)
 135                                 return -ENOMEM;
 136
 137                         show_sysfs_one(udev, seat, item, sysfs, p, n_columns - 2);
 138                 }
 139         }
 140
 141         return 0;
 142 }
 143
 144 int show_sysfs(const char *seat, const char *prefix, unsigned n_columns) {
 145         _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
 146         _cleanup_udev_unref_ struct udev *udev = NULL;
 147         struct udev_list_entry *first = NULL;
 148         int r;
 149
 150         if (n_columns <= 0)
 151                 n_columns = columns();
 152
 153         if (!prefix)
 154                 prefix = "";
 155
 156         if (isempty(seat))
 157                 seat = "seat0";
 158
 159         udev = udev_new();
 160         if (!udev)
 161                 return -ENOMEM;
 162
 163         e = udev_enumerate_new(udev);
 164         if (!e)
 165                 return -ENOMEM;
 166
 167         if (!streq(seat, "seat0"))
 168                 r = udev_enumerate_add_match_tag(e, seat);
 169         else
 170                 r = udev_enumerate_add_match_tag(e, "seat");
 171         if (r < 0)
 172                 return r;
 173
 174         r = udev_enumerate_add_match_is_initialized(e);
 175         if (r < 0)
 176                 return r;
 177
 178         r = udev_enumerate_scan_devices(e);
 179         if (r < 0)
 180                 return r;
 181
 182         first = udev_enumerate_get_list_entry(e);
 183         if (first)
 184                 show_sysfs_one(udev, seat, &first, "/", prefix, n_columns);
 185         else
 186                 printf("%s%s%s\n", prefix, draw_special_char(DRAW_TREE_RIGHT), "(none)");
 187
 188         return r;
 189 }