src/login/sysfs-show.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <string.h>
   5
   6 #if 0 /// elogind needs the systems udev header
   7 #include "libudev.h"
   8 #else
   9 #include <libudev.h>
  10 #endif // 0
  11
  12 #include "alloc-util.h"
  13 #include "locale-util.h"
  14 #include "path-util.h"
  15 #include "string-util.h"
  16 #include "sysfs-show.h"
  17 #include "terminal-util.h"
  18 #include "udev-util.h"
  19 #include "util.h"
  20
  21 static int show_sysfs_one(
  22                 struct udev *udev,
  23                 const char *seat,
  24                 struct udev_list_entry **item,
  25                 const char *sub,
  26                 const char *prefix,
  27                 unsigned n_columns,
  28                 OutputFlags flags) {
  29
  30         size_t max_width;
  31
  32         assert(udev);
  33         assert(seat);
  34         assert(item);
  35         assert(prefix);
  36
  37         if (flags & OUTPUT_FULL_WIDTH)
  38                 max_width = (size_t) -1;
  39         else if (n_columns < 10)
  40                 max_width = 10;
  41         else
  42                 max_width = n_columns;
  43
  44         while (*item) {
  45                 _cleanup_(udev_device_unrefp) 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_unrefp) 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, max_width, 20);
 107                 if (!k)
 108                         return -ENOMEM;
 109
 110                 printf("%s%s%s\n", prefix, special_glyph(lookahead ? TREE_BRANCH : TREE_RIGHT), k);
 111
 112                 if (asprintf(&l,
 113                              "%s%s:%s%s%s%s",
 114                              is_master ? "[MASTER] " : "",
 115                              subsystem, sysname,
 116                              name ? " \"" : "", strempty(name), name ? "\"" : "") < 0)
 117                         return -ENOMEM;
 118
 119                 free(k);
 120                 k = ellipsize(l, max_width, 70);
 121                 if (!k)
 122                         return -ENOMEM;
 123
 124                 printf("%s%s%s\n", prefix, lookahead ? special_glyph(TREE_VERTICAL) : "  ", k);
 125
 126                 *item = next;
 127                 if (*item) {
 128                         _cleanup_free_ char *p = NULL;
 129
 130                         p = strappend(prefix, lookahead ? special_glyph(TREE_VERTICAL) : "  ");
 131                         if (!p)
 132                                 return -ENOMEM;
 133
 134                         show_sysfs_one(udev, seat, item, sysfs, p,
 135                                        n_columns == (unsigned) -1 || n_columns < 2 ? n_columns : n_columns - 2,
 136                                        flags);
 137                 }
 138         }
 139
 140         return 0;
 141 }
 142
 143 int show_sysfs(const char *seat, const char *prefix, unsigned n_columns, OutputFlags flags) {
 144         _cleanup_(udev_enumerate_unrefp) struct udev_enumerate *e = NULL;
 145         _cleanup_(udev_unrefp) struct udev *udev = NULL;
 146         struct udev_list_entry *first = NULL;
 147         int r;
 148
 149         if (n_columns <= 0)
 150                 n_columns = columns();
 151
 152         prefix = strempty(prefix);
 153
 154         if (isempty(seat))
 155                 seat = "seat0";
 156
 157         udev = udev_new();
 158         if (!udev)
 159                 return -ENOMEM;
 160
 161         e = udev_enumerate_new(udev);
 162         if (!e)
 163                 return -ENOMEM;
 164
 165         if (!streq(seat, "seat0"))
 166                 r = udev_enumerate_add_match_tag(e, seat);
 167         else
 168                 r = udev_enumerate_add_match_tag(e, "seat");
 169         if (r < 0)
 170                 return r;
 171
 172         r = udev_enumerate_add_match_is_initialized(e);
 173         if (r < 0)
 174                 return r;
 175
 176         r = udev_enumerate_scan_devices(e);
 177         if (r < 0)
 178                 return r;
 179
 180         first = udev_enumerate_get_list_entry(e);
 181         if (first)
 182                 show_sysfs_one(udev, seat, &first, "/", prefix, n_columns, flags);
 183         else
 184                 printf("%s%s%s\n", prefix, special_glyph(TREE_RIGHT), "(none)");
 185
 186         return r;
 187 }