src/login/sysfs-show.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <string.h>
  24
  25 #include "libudev.h"
  26
  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 }