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 #include <libudev.h>
  25
  26 #include "util.h"
  27 #include "sysfs-show.h"
  28
  29 static int show_sysfs_one(
  30                 struct udev *udev,
  31                 const char *seat,
  32                 struct udev_list_entry **item,
  33                 const char *sub,
  34                 const char *prefix,
  35                 unsigned n_columns) {
  36
  37         assert(udev);
  38         assert(seat);
  39         assert(item);
  40         assert(prefix);
  41
  42         while (*item) {
  43                 struct udev_list_entry *next, *lookahead;
  44                 struct udev_device *d;
  45                 const char *sn, *name, *sysfs, *subsystem, *sysname;
  46                 char *l, *k;
  47
  48                 sysfs = udev_list_entry_get_name(*item);
  49                 if (!path_startswith(sysfs, sub))
  50                         return 0;
  51
  52                 d = udev_device_new_from_syspath(udev, sysfs);
  53                 if (!d) {
  54                         *item = udev_list_entry_get_next(*item);
  55                         continue;
  56                 }
  57
  58                 sn = udev_device_get_property_value(d, "ID_SEAT");
  59                 if (isempty(sn))
  60                         sn = "seat0";
  61
  62                 /* fixme, also check for tag 'seat' here */
  63                 if (!streq(seat, sn) || !udev_device_has_tag(d, "seat")) {
  64                         udev_device_unref(d);
  65                         *item = udev_list_entry_get_next(*item);
  66                         continue;
  67                 }
  68
  69                 name = udev_device_get_sysattr_value(d, "name");
  70                 if (!name)
  71                         name = udev_device_get_sysattr_value(d, "id");
  72                 subsystem = udev_device_get_subsystem(d);
  73                 sysname = udev_device_get_sysname(d);
  74
  75                 /* Look if there's more coming after this */
  76                 lookahead = next = udev_list_entry_get_next(*item);
  77                 while (lookahead) {
  78                         const char *lookahead_sysfs;
  79
  80                         lookahead_sysfs = udev_list_entry_get_name(lookahead);
  81
  82                         if (path_startswith(lookahead_sysfs, sub) &&
  83                             !path_startswith(lookahead_sysfs, sysfs)) {
  84                                 struct udev_device *lookahead_d;
  85
  86                                 lookahead_d = udev_device_new_from_syspath(udev, lookahead_sysfs);
  87                                 if (lookahead_d) {
  88                                         const char *lookahead_sn;
  89                                         bool found;
  90
  91                                         lookahead_sn = udev_device_get_property_value(d, "ID_SEAT");
  92                                         if (isempty(lookahead_sn))
  93                                                 lookahead_sn = "seat0";
  94
  95                                         found = streq(seat, lookahead_sn) && udev_device_has_tag(lookahead_d, "seat");
  96                                         udev_device_unref(lookahead_d);
  97
  98                                         if (found)
  99                                                 break;
 100                                 }
 101                         }
 102
 103                         lookahead = udev_list_entry_get_next(lookahead);
 104                 }
 105
 106                 k = ellipsize(sysfs, n_columns, 20);
 107                 printf("%s%s %s\n", prefix, lookahead ? "\342\224\234" : "\342\224\224", k ? k : sysfs);
 108                 free(k);
 109
 110                 if (asprintf(&l,
 111                              "(%s:%s)%s%s%s",
 112                              subsystem, sysname,
 113                              name ? " \"" : "", name ? name : "", name ? "\"" : "") < 0) {
 114                         udev_device_unref(d);
 115                         return -ENOMEM;
 116                 }
 117
 118                 k = ellipsize(l, n_columns, 70);
 119                 printf("%s%s %s\n", prefix, lookahead ? "\342\224\202" : " ", k ? k : l);
 120                 free(k);
 121                 free(l);
 122
 123                 *item = next;
 124                 if (*item) {
 125                         char *p;
 126
 127                         p = strappend(prefix, lookahead ? "\342\224\202 " : "  ");
 128                         show_sysfs_one(udev, seat, item, sysfs, p ? p : prefix, n_columns - 2);
 129                         free(p);
 130                 }
 131
 132                 udev_device_unref(d);
 133         }
 134
 135         return 0;
 136 }
 137
 138 int show_sysfs(const char *seat, const char *prefix, unsigned n_columns) {
 139         struct udev *udev;
 140         struct udev_list_entry *first = NULL;
 141         struct udev_enumerate *e;
 142         int r;
 143
 144         if (n_columns <= 0)
 145                 n_columns = columns();
 146
 147         if (!prefix)
 148                 prefix = "";
 149
 150         if (isempty(seat))
 151                 seat = "seat0";
 152
 153         udev = udev_new();
 154         if (!udev)
 155                 return -ENOMEM;
 156
 157         e = udev_enumerate_new(udev);
 158         if (!e) {
 159                 r = -ENOMEM;
 160                 goto finish;
 161         }
 162
 163         if (!streq(seat, "seat0"))
 164                 r = udev_enumerate_add_match_tag(e, seat);
 165         else
 166                 r = udev_enumerate_add_match_tag(e, "seat");
 167
 168         if (r < 0)
 169                 goto finish;
 170
 171         r = udev_enumerate_scan_devices(e);
 172         if (r < 0)
 173                 goto finish;
 174
 175         first = udev_enumerate_get_list_entry(e);
 176         if (first)
 177                 show_sysfs_one(udev, seat, &first, "/", prefix, n_columns);
 178
 179 finish:
 180         if (e)
 181                 udev_enumerate_unref(e);
 182
 183         if (udev)
 184                 udev_unref(udev);
 185
 186         return r;
 187 }