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, *name, *sysfs, *subsystem, *sysname;
  63                 char *l, *k;
  64
  65                 sysfs = udev_list_entry_get_name(*item);
  66                 if (!path_startswith(sysfs, sub))
  67                         return 0;
  68
  69                 d = udev_device_new_from_syspath(udev, sysfs);
  70                 if (!d) {
  71                         *item = udev_list_entry_get_next(*item);
  72                         continue;
  73                 }
  74
  75                 sn = udev_device_get_property_value(d, "ID_SEAT");
  76                 if (isempty(sn))
  77                         sn = "seat0";
  78
  79                 /* fixme, also check for tag 'seat' here */
  80                 if (!streq(seat, sn) || !device_has_tag(d, "seat")) {
  81                         udev_device_unref(d);
  82                         *item = udev_list_entry_get_next(*item);
  83                         continue;
  84                 }
  85
  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(lookahead_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                 k = ellipsize(sysfs, n_columns, 20);
 124                 printf("%s%s %s\n", prefix, lookahead ? "\342\224\234" : "\342\224\224", k ? k : sysfs);
 125                 free(k);
 126
 127                 if (asprintf(&l,
 128                              "(%s:%s)%s%s%s",
 129                              subsystem, sysname,
 130                              name ? " \"" : "", name ? name : "", name ? "\"" : "") < 0) {
 131                         udev_device_unref(d);
 132                         return -ENOMEM;
 133                 }
 134
 135                 k = ellipsize(l, n_columns, 70);
 136                 printf("%s%s %s\n", prefix, lookahead ? "\342\224\202" : " ", k ? k : l);
 137                 free(k);
 138                 free(l);
 139
 140                 *item = next;
 141                 if (*item) {
 142                         char *p;
 143
 144                         p = strappend(prefix, lookahead ? "\342\224\202 " : "  ");
 145                         show_sysfs_one(udev, seat, item, sysfs, p ? p : prefix, n_columns - 2);
 146                         free(p);
 147                 }
 148
 149                 udev_device_unref(d);
 150         }
 151
 152         return 0;
 153 }
 154
 155 int show_sysfs(const char *seat, const char *prefix, unsigned n_columns) {
 156         struct udev *udev;
 157         struct udev_list_entry *first = NULL;
 158         struct udev_enumerate *e;
 159         int r;
 160
 161         if (n_columns <= 0)
 162                 n_columns = columns();
 163
 164         if (!prefix)
 165                 prefix = "";
 166
 167         if (isempty(seat))
 168                 seat = "seat0";
 169
 170         udev = udev_new();
 171         if (!udev)
 172                 return -ENOMEM;
 173
 174         e = udev_enumerate_new(udev);
 175         if (!e) {
 176                 r = -ENOMEM;
 177                 goto finish;
 178         }
 179
 180         if (!streq(seat, "seat0"))
 181                 r = udev_enumerate_add_match_tag(e, seat);
 182         else
 183                 r = udev_enumerate_add_match_tag(e, "seat");
 184
 185         r = udev_enumerate_scan_devices(e);
 186         if (r < 0)
 187                 goto finish;
 188
 189         first = udev_enumerate_get_list_entry(e);
 190         if (first)
 191                 show_sysfs_one(udev, seat, &first, "/", prefix, n_columns);
 192
 193 finish:
 194         if (e)
 195                 udev_enumerate_unref(e);
 196
 197         if (udev)
 198                 udev_unref(udev);
 199
 200         return r;
 201 }