1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <errno.h>
#include "alloc-util.h"
#include "bus-error.h"
#include "bus-util.h"
#include "device-private.h"
#include "path-util.h"
#include "udevadm-util.h"
#include "unit-name.h"
static int find_device_from_unit(const char *unit_name, sd_device **ret) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
_cleanup_free_ char *unit_path = NULL, *syspath = NULL;
int r;
if (!unit_name_is_valid(unit_name, UNIT_NAME_PLAIN))
return -EINVAL;
if (unit_name_to_type(unit_name) != UNIT_DEVICE)
return -EINVAL;
r = bus_connect_system_systemd(&bus);
if (r < 0) {
_cleanup_free_ char *path = NULL;
log_debug_errno(r, "Failed to open connection to systemd, using unit name as syspath: %m");
r = unit_name_to_path(unit_name, &path);
if (r < 0)
return log_debug_errno(r, "Failed to convert \"%s\" to a device path: %m", unit_name);
return sd_device_new_from_path(ret, path);
}
unit_path = unit_dbus_path_from_name(unit_name);
if (!unit_path)
return -ENOMEM;
r = sd_bus_get_property_string(
bus,
"org.freedesktop.systemd1",
unit_path,
"org.freedesktop.systemd1.Device",
"SysFSPath",
&error,
&syspath);
if (r < 0)
return log_debug_errno(r, "Failed to get SysFSPath= dbus property for %s: %s",
unit_name, bus_error_message(&error, r));
return sd_device_new_from_syspath(ret, syspath);
}
int find_device(const char *id, const char *prefix, sd_device **ret) {
assert(id);
assert(ret);
if (sd_device_new_from_path(ret, id) >= 0)
return 0;
if (prefix && !path_startswith(id, prefix)) {
_cleanup_free_ char *path = NULL;
path = path_join(prefix, id);
if (!path)
return -ENOMEM;
if (sd_device_new_from_path(ret, path) >= 0)
return 0;
}
/* if a path is provided, then it cannot be a unit name. Let's return earlier. */
if (is_path(id))
return -ENODEV;
/* Check if the argument looks like a device unit name. */
return find_device_from_unit(id, ret);
}
int find_device_with_action(const char *id, sd_device_action_t action, sd_device **ret) {
_cleanup_(sd_device_unrefp) sd_device *dev = NULL;
int r;
assert(id);
assert(ret);
assert(action >= 0 && action < _SD_DEVICE_ACTION_MAX);
r = find_device(id, "/sys", &dev);
if (r < 0)
return r;
r = device_read_uevent_file(dev);
if (r < 0)
return r;
r = device_set_action(dev, action);
if (r < 0)
return r;
*ret = TAKE_PTR(dev);
return 0;
}
int parse_device_action(const char *str, sd_device_action_t *action) {
sd_device_action_t a;
assert(str);
assert(action);
if (streq(str, "help")) {
dump_device_action_table();
return 0;
}
a = device_action_from_string(str);
if (a < 0)
return a;
*action = a;
return 1;
}
|
