src/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 General Public License as published by
  10   the Free Software Foundation; either version 2 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   General Public License for more details.
  17
  18   You should have received a copy of the GNU 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 #include <libudev.h>
  25
  26 #include "util.h"
  27 #include "sysfs-show.h"
  28
  29 static bool device_has_tag(struct udev_device *d, const char *tag) {
  30         struct udev_list_entry *first, *item;
  31
  32         assert(d);
  33         assert(tag);
  34
  35         /* FIXME */
  36         udev_device_get_is_initialized(d);
  37
  38         first = udev_device_get_tags_list_entry(d);
  39         udev_list_entry_foreach(item, first)
  40                 if (streq(udev_list_entry_get_name(item), tag))
  41                         return true;
  42
  43         return false;
  44 }
  45
  46 static int show_sysfs_one(
  47                 struct udev *udev,
  48                 const char *seat,
  49                 struct udev_list_entry **item,
  50                 const char *sub,
  51                 const char *prefix,
  52                 unsigned n_columns) {
  53
  54         assert(udev);
  55         assert(seat);
  56         assert(item);
  57         assert(prefix);
  58
  59         while (*item) {
  60                 struct udev_list_entry *next, *lookahead;
  61                 struct udev_device *d;
  62                 const char *sn, *id, *name, *sysfs, *subsystem, *sysname;
  63
  64                 sysfs = udev_list_entry_get_name(*item);
  65                 if (!path_startswith(sysfs, sub))
  66                         return 0;
  67
  68                 d = udev_device_new_from_syspath(udev, sysfs);
  69                 if (!d) {
  70                         *item = udev_list_entry_get_next(*item);
  71                         continue;
  72                 }
  73
  74                 sn = udev_device_get_property_value(d, "ID_SEAT");
  75                 if (isempty(sn))
  76                         sn = "seat0";
  77
  78                 /* fixme, also check for tag 'seat' here */
  79                 if (!streq(seat, sn) || !device_has_tag(d, "seat")) {
  80                         udev_device_unref(d);
  81                         *item = udev_list_entry_get_next(*item);
  82                         continue;
  83                 }
  84
  85                 id = udev_device_get_property_value(d, "ID_FOR_SEAT");
  86                 name = udev_device_get_sysattr_value(d, "name");
  87                 if (!name)
  88                         name = udev_device_get_sysattr_value(d, "id");
  89                 subsystem = udev_device_get_subsystem(d);
  90                 sysname = udev_device_get_sysname(d);
  91
  92                 /* Look if there's more coming after this */
  93                 lookahead = next = udev_list_entry_get_next(*item);
  94                 while (lookahead) {
  95                         const char *lookahead_sysfs;
  96
  97                         lookahead_sysfs = udev_list_entry_get_name(lookahead);
  98
  99                         if (path_startswith(lookahead_sysfs, sub) &&
 100                             !path_startswith(lookahead_sysfs, sysfs)) {
 101                                 struct udev_device *lookahead_d;
 102
 103                                 lookahead_d = udev_device_new_from_syspath(udev, lookahead_sysfs);
 104                                 if (lookahead_d) {
 105                                         const char *lookahead_sn;
 106                                         bool found;
 107
 108                                         lookahead_sn = udev_device_get_property_value(d, "ID_SEAT");
 109                                         if (isempty(lookahead_sn))
 110                                                 lookahead_sn = "seat0";
 111
 112                                         found = streq(seat, lookahead_sn) && device_has_tag(d, "seat");
 113                                         udev_device_unref(lookahead_d);
 114
 115                                         if (found)
 116                                                 break;
 117                                 }
 118                         }
 119
 120                         lookahead = udev_list_entry_get_next(lookahead);
 121                 }
 122
 123                 printf("%s%s %s (%s:%s)", prefix, lookahead ? "\342\224\234" : "\342\224\224", id ? id : sysfs, subsystem, sysname);
 124
 125                 if (name)
 126                         printf(" \"%s\"\n", name);
 127                 else
 128                         printf("\n");
 129
 130                 *item = next;
 131                 if (*item) {
 132                         char *p;
 133
 134                         p = strappend(prefix, lookahead ? "\342\224\202 " : "  ");
 135                         show_sysfs_one(udev, seat, item, sysfs, p, n_columns - 2);
 136                         free(p);
 137                 }
 138
 139                 udev_device_unref(d);
 140         }
 141
 142         return 0;
 143 }
 144
 145 int show_sysfs(const char *seat, const char *prefix, unsigned n_columns) {
 146         struct udev *udev;
 147         struct udev_list_entry *first = NULL;
 148         struct udev_enumerate *e;
 149         int r;
 150
 151         if (n_columns <= 0)
 152                 n_columns = columns();
 153
 154         if (!prefix)
 155                 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                 r = -ENOMEM;
 167                 goto finish;
 168         }
 169
 170         if (!streq(seat, "seat0"))
 171                 r = udev_enumerate_add_match_tag(e, seat);
 172         else
 173                 r = udev_enumerate_add_match_tag(e, "seat");
 174
 175         r = udev_enumerate_scan_devices(e);
 176         if (r < 0)
 177                 goto finish;
 178
 179         first = udev_enumerate_get_list_entry(e);
 180         if (first)
 181                 show_sysfs_one(udev, seat, &first, "/", prefix, n_columns);
 182
 183 finish:
 184         if (e)
 185                 udev_enumerate_unref(e);
 186
 187         if (udev)
 188                 udev_unref(udev);
 189
 190         return r;
 191 }