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 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 }