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 #if 0 /// elogind needs the systems udev header
  24 #include "libudev.h"
  25 #else
  26 #include <libudev.h>
  27 #endif // 0
  28
  29 #include "alloc-util.h"
  30 #include "locale-util.h"
  31 #include "path-util.h"
  32 #include "string-util.h"
  33 #include "sysfs-show.h"
  34 #include "terminal-util.h"
  35 #include "udev-util.h"
  36 #include "util.h"
  37
  38 static int show_sysfs_one(
  39                 struct udev *udev,
  40                 const char *seat,
  41                 struct udev_list_entry **item,
  42                 const char *sub,
  43                 const char *prefix,
  44                 unsigned n_columns) {
  45
  46         assert(udev);
  47         assert(seat);
  48         assert(item);
  49         assert(prefix);
  50
  51         while (*item) {
  52                 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
  53                 struct udev_list_entry *next, *lookahead;
  54                 const char *sn, *name, *sysfs, *subsystem, *sysname;
  55                 _cleanup_free_ char *k = NULL, *l = NULL;
  56                 bool is_master;
  57
  58                 sysfs = udev_list_entry_get_name(*item);
  59                 if (!path_startswith(sysfs, sub))
  60                         return 0;
  61
  62                 d = udev_device_new_from_syspath(udev, sysfs);
  63                 if (!d) {
  64                         *item = udev_list_entry_get_next(*item);
  65                         continue;
  66                 }
  67
  68                 sn = udev_device_get_property_value(d, "ID_SEAT");
  69                 if (isempty(sn))
  70                         sn = "seat0";
  71
  72                 /* Explicitly also check for tag 'seat' here */
  73                 if (!streq(seat, sn) || !udev_device_has_tag(d, "seat")) {
  74                         *item = udev_list_entry_get_next(*item);
  75                         continue;
  76                 }
  77
  78                 is_master = udev_device_has_tag(d, "master-of-seat");
  79
  80                 name = udev_device_get_sysattr_value(d, "name");
  81                 if (!name)
  82                         name = udev_device_get_sysattr_value(d, "id");
  83                 subsystem = udev_device_get_subsystem(d);
  84                 sysname = udev_device_get_sysname(d);
  85
  86                 /* Look if there's more coming after this */
  87                 lookahead = next = udev_list_entry_get_next(*item);
  88                 while (lookahead) {
  89                         const char *lookahead_sysfs;
  90
  91                         lookahead_sysfs = udev_list_entry_get_name(lookahead);
  92
  93                         if (path_startswith(lookahead_sysfs, sub) &&
  94                             !path_startswith(lookahead_sysfs, sysfs)) {
  95                                 _cleanup_udev_device_unref_ struct udev_device *lookahead_d = NULL;
  96
  97                                 lookahead_d = udev_device_new_from_syspath(udev, lookahead_sysfs);
  98                                 if (lookahead_d) {
  99                                         const char *lookahead_sn;
 100
 101                                         lookahead_sn = udev_device_get_property_value(d, "ID_SEAT");
 102                                         if (isempty(lookahead_sn))
 103                                                 lookahead_sn = "seat0";
 104
 105                                         if (streq(seat, lookahead_sn) && udev_device_has_tag(lookahead_d, "seat"))
 106                                                 break;
 107                                 }
 108                         }
 109
 110                         lookahead = udev_list_entry_get_next(lookahead);
 111                 }
 112
 113                 k = ellipsize(sysfs, n_columns, 20);
 114                 if (!k)
 115                         return -ENOMEM;
 116
 117                 printf("%s%s%s\n", prefix, special_glyph(lookahead ? TREE_BRANCH : TREE_RIGHT), k);
 118
 119                 if (asprintf(&l,
 120                              "%s%s:%s%s%s%s",
 121                              is_master ? "[MASTER] " : "",
 122                              subsystem, sysname,
 123                              name ? " \"" : "", strempty(name), name ? "\"" : "") < 0)
 124                         return -ENOMEM;
 125
 126                 free(k);
 127                 k = ellipsize(l, n_columns, 70);
 128                 if (!k)
 129                         return -ENOMEM;
 130
 131                 printf("%s%s%s\n", prefix, lookahead ? special_glyph(TREE_VERTICAL) : "  ", k);
 132
 133                 *item = next;
 134                 if (*item) {
 135                         _cleanup_free_ char *p = NULL;
 136
 137                         p = strappend(prefix, lookahead ? special_glyph(TREE_VERTICAL) : "  ");
 138                         if (!p)
 139                                 return -ENOMEM;
 140
 141                         show_sysfs_one(udev, seat, item, sysfs, p, n_columns - 2);
 142                 }
 143         }
 144
 145         return 0;
 146 }
 147
 148 int show_sysfs(const char *seat, const char *prefix, unsigned n_columns) {
 149         _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
 150         _cleanup_udev_unref_ struct udev *udev = NULL;
 151         struct udev_list_entry *first = NULL;
 152         int r;
 153
 154         if (n_columns <= 0)
 155                 n_columns = columns();
 156
 157         if (!prefix)
 158                 prefix = "";
 159
 160         if (isempty(seat))
 161                 seat = "seat0";
 162
 163         udev = udev_new();
 164         if (!udev)
 165                 return -ENOMEM;
 166
 167         e = udev_enumerate_new(udev);
 168         if (!e)
 169                 return -ENOMEM;
 170
 171         if (!streq(seat, "seat0"))
 172                 r = udev_enumerate_add_match_tag(e, seat);
 173         else
 174                 r = udev_enumerate_add_match_tag(e, "seat");
 175         if (r < 0)
 176                 return r;
 177
 178         r = udev_enumerate_add_match_is_initialized(e);
 179         if (r < 0)
 180                 return r;
 181
 182         r = udev_enumerate_scan_devices(e);
 183         if (r < 0)
 184                 return r;
 185
 186         first = udev_enumerate_get_list_entry(e);
 187         if (first)
 188                 show_sysfs_one(udev, seat, &first, "/", prefix, n_columns);
 189         else
 190                 printf("%s%s%s\n", prefix, special_glyph(TREE_RIGHT), "(none)");
 191
 192         return r;
 193 }