diff options
Diffstat (limited to 'src/grp-login/loginctl/sysfs-show.c')
| -rw-r--r-- | src/grp-login/loginctl/sysfs-show.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/src/grp-login/loginctl/sysfs-show.c b/src/grp-login/loginctl/sysfs-show.c new file mode 100644 index 0000000000..29785e2f11 --- /dev/null +++ b/src/grp-login/loginctl/sysfs-show.c @@ -0,0 +1,189 @@ +/*** + This file is part of systemd. + + Copyright 2010 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <errno.h> +#include <string.h> + +#include "libudev.h" + +#include "alloc-util.h" +#include "locale-util.h" +#include "path-util.h" +#include "string-util.h" +#include "sysfs-show.h" +#include "terminal-util.h" +#include "udev-util.h" +#include "util.h" + +static int show_sysfs_one( + struct udev *udev, + const char *seat, + struct udev_list_entry **item, + const char *sub, + const char *prefix, + unsigned n_columns) { + + assert(udev); + assert(seat); + assert(item); + assert(prefix); + + while (*item) { + _cleanup_udev_device_unref_ struct udev_device *d = NULL; + struct udev_list_entry *next, *lookahead; + const char *sn, *name, *sysfs, *subsystem, *sysname; + _cleanup_free_ char *k = NULL, *l = NULL; + bool is_master; + + sysfs = udev_list_entry_get_name(*item); + if (!path_startswith(sysfs, sub)) + return 0; + + d = udev_device_new_from_syspath(udev, sysfs); + if (!d) { + *item = udev_list_entry_get_next(*item); + continue; + } + + sn = udev_device_get_property_value(d, "ID_SEAT"); + if (isempty(sn)) + sn = "seat0"; + + /* Explicitly also check for tag 'seat' here */ + if (!streq(seat, sn) || !udev_device_has_tag(d, "seat")) { + *item = udev_list_entry_get_next(*item); + continue; + } + + is_master = udev_device_has_tag(d, "master-of-seat"); + + name = udev_device_get_sysattr_value(d, "name"); + if (!name) + name = udev_device_get_sysattr_value(d, "id"); + subsystem = udev_device_get_subsystem(d); + sysname = udev_device_get_sysname(d); + + /* Look if there's more coming after this */ + lookahead = next = udev_list_entry_get_next(*item); + while (lookahead) { + const char *lookahead_sysfs; + + lookahead_sysfs = udev_list_entry_get_name(lookahead); + + if (path_startswith(lookahead_sysfs, sub) && + !path_startswith(lookahead_sysfs, sysfs)) { + _cleanup_udev_device_unref_ struct udev_device *lookahead_d = NULL; + + lookahead_d = udev_device_new_from_syspath(udev, lookahead_sysfs); + if (lookahead_d) { + const char *lookahead_sn; + + lookahead_sn = udev_device_get_property_value(d, "ID_SEAT"); + if (isempty(lookahead_sn)) + lookahead_sn = "seat0"; + + if (streq(seat, lookahead_sn) && udev_device_has_tag(lookahead_d, "seat")) + break; + } + } + + lookahead = udev_list_entry_get_next(lookahead); + } + + k = ellipsize(sysfs, n_columns, 20); + if (!k) + return -ENOMEM; + + printf("%s%s%s\n", prefix, special_glyph(lookahead ? TREE_BRANCH : TREE_RIGHT), k); + + if (asprintf(&l, + "%s%s:%s%s%s%s", + is_master ? "[MASTER] " : "", + subsystem, sysname, + name ? " \"" : "", strempty(name), name ? "\"" : "") < 0) + return -ENOMEM; + + free(k); + k = ellipsize(l, n_columns, 70); + if (!k) + return -ENOMEM; + + printf("%s%s%s\n", prefix, lookahead ? special_glyph(TREE_VERTICAL) : " ", k); + + *item = next; + if (*item) { + _cleanup_free_ char *p = NULL; + + p = strappend(prefix, lookahead ? special_glyph(TREE_VERTICAL) : " "); + if (!p) + return -ENOMEM; + + show_sysfs_one(udev, seat, item, sysfs, p, n_columns - 2); + } + } + + return 0; +} + +int show_sysfs(const char *seat, const char *prefix, unsigned n_columns) { + _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; + _cleanup_udev_unref_ struct udev *udev = NULL; + struct udev_list_entry *first = NULL; + int r; + + if (n_columns <= 0) + n_columns = columns(); + + if (!prefix) + prefix = ""; + + if (isempty(seat)) + seat = "seat0"; + + udev = udev_new(); + if (!udev) + return -ENOMEM; + + e = udev_enumerate_new(udev); + if (!e) + return -ENOMEM; + + if (!streq(seat, "seat0")) + r = udev_enumerate_add_match_tag(e, seat); + else + r = udev_enumerate_add_match_tag(e, "seat"); + if (r < 0) + return r; + + r = udev_enumerate_add_match_is_initialized(e); + if (r < 0) + return r; + + r = udev_enumerate_scan_devices(e); + if (r < 0) + return r; + + first = udev_enumerate_get_list_entry(e); + if (first) + show_sysfs_one(udev, seat, &first, "/", prefix, n_columns); + else + printf("%s%s%s\n", prefix, special_glyph(TREE_RIGHT), "(none)"); + + return r; +} |