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 #include "path-util.h"
  29 #include "udev-util.h"
  30
  31 static int show_sysfs_one(
  32                 struct udev *udev,
  33                 const char *seat,
  34                 struct udev_list_entry **item,
  35                 const char *sub,
  36                 const char *prefix,
  37                 unsigned n_columns) {
  38
  39         assert(udev);
  40         assert(seat);
  41         assert(item);
  42         assert(prefix);
  43
  44         while (*item) {
  45                 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
  46                 struct udev_list_entry *next, *lookahead;
  47                 const char *sn, *name, *sysfs, *subsystem, *sysname;
  48                 _cleanup_free_ char *k = NULL, *l = NULL;
  49                 bool is_master;
  50
  51                 sysfs = udev_list_entry_get_name(*item);
  52                 if (!path_startswith(sysfs, sub))
  53                         return 0;
  54
  55                 d = udev_device_new_from_syspath(udev, sysfs);
  56                 if (!d) {
  57                         *item = udev_list_entry_get_next(*item);
  58                         continue;
  59                 }
  60
  61                 sn = udev_device_get_property_value(d, "ID_SEAT");
  62                 if (isempty(sn))
  63                         sn = "seat0";
  64
  65                 /* Explicitly also check for tag 'seat' here */
  66                 if (!streq(seat, sn) || !udev_device_has_tag(d, "seat")) {
  67                         *item = udev_list_entry_get_next(*item);
  68                         continue;
  69                 }
  70
  71                 is_master = udev_device_has_tag(d, "master-of-seat");
  72
  73                 name = udev_device_get_sysattr_value(d, "name");
  74                 if (!name)
  75                         name = udev_device_get_sysattr_value(d, "id");
  76                 subsystem = udev_device_get_subsystem(d);
  77                 sysname = udev_device_get_sysname(d);
  78
  79                 /* Look if there's more coming after this */
  80                 lookahead = next = udev_list_entry_get_next(*item);
  81                 while (lookahead) {
  82                         const char *lookahead_sysfs;
  83
  84                         lookahead_sysfs = udev_list_entry_get_name(lookahead);
  85
  86                         if (path_startswith(lookahead_sysfs, sub) &&
  87                             !path_startswith(lookahead_sysfs, sysfs)) {
  88                                 _cleanup_udev_device_unref_ struct udev_device *lookahead_d = NULL;
  89
  90                                 lookahead_d = udev_device_new_from_syspath(udev, lookahead_sysfs);
  91                                 if (lookahead_d) {
  92                                         const char *lookahead_sn;
  93
  94                                         lookahead_sn = udev_device_get_property_value(d, "ID_SEAT");
  95                                         if (isempty(lookahead_sn))
  96                                                 lookahead_sn = "seat0";
  97
  98                                         if (streq(seat, lookahead_sn) && udev_device_has_tag(lookahead_d, "seat"))
  99                                                 break;
 100                                 }
 101                         }
 102
 103                         lookahead = udev_list_entry_get_next(lookahead);
 104                 }
 105
 106                 k = ellipsize(sysfs, n_columns, 20);
 107                 if (!k)
 108                         return -ENOMEM;
 109
 110                 printf("%s%s%s\n", prefix, draw_special_char(lookahead ? DRAW_TREE_BRANCH : DRAW_TREE_RIGHT), k);
 111
 112                 if (asprintf(&l,
 113                              "%s%s:%s%s%s%s",
 114                              is_master ? "[MASTER] " : "",
 115                              subsystem, sysname,
 116                              name ? " \"" : "", name ? name : "", name ? "\"" : "") < 0)
 117                         return -ENOMEM;
 118
 119                 free(k);
 120                 k = ellipsize(l, n_columns, 70);
 121                 if (!k)
 122                         return -ENOMEM;
 123
 124                 printf("%s%s%s\n", prefix, lookahead ? draw_special_char(DRAW_TREE_VERT) : "  ", k);
 125
 126                 *item = next;
 127                 if (*item) {
 128                         _cleanup_free_ char *p = NULL;
 129
 130                         p = strappend(prefix, lookahead ? draw_special_char(DRAW_TREE_VERT) : "  ");
 131                         if (!p)
 132                                 return -ENOMEM;
 133
 134                         show_sysfs_one(udev, seat, item, sysfs, p, n_columns - 2);
 135                 }
 136         }
 137
 138         return 0;
 139 }
 140
 141 int show_sysfs(const char *seat, const char *prefix, unsigned n_columns) {
 142         _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
 143         _cleanup_udev_unref_ struct udev *udev = NULL;
 144         struct udev_list_entry *first = NULL;
 145         int r;
 146
 147         if (n_columns <= 0)
 148                 n_columns = columns();
 149
 150         if (!prefix)
 151                 prefix = "";
 152
 153         if (isempty(seat))
 154                 seat = "seat0";
 155
 156         udev = udev_new();
 157         if (!udev)
 158                 return -ENOMEM;
 159
 160         e = udev_enumerate_new(udev);
 161         if (!e)
 162                 return -ENOMEM;
 163
 164         if (!streq(seat, "seat0"))
 165                 r = udev_enumerate_add_match_tag(e, seat);
 166         else
 167                 r = udev_enumerate_add_match_tag(e, "seat");
 168         if (r < 0)
 169                 return r;
 170
 171         r = udev_enumerate_add_match_is_initialized(e);
 172         if (r < 0)
 173                 return r;
 174
 175         r = udev_enumerate_scan_devices(e);
 176         if (r < 0)
 177                 return r;
 178
 179         first = udev_enumerate_get_list_entry(e);
 180         if (first)
 181                 show_sysfs_one(udev, seat, &first, "/", prefix, n_columns);
 182         else
 183                 printf("%s%s%s\n", prefix, draw_special_char(DRAW_TREE_RIGHT), "(none)");
 184
 185         return r;
 186 }