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/*-*- Mode: C; c-basic-offset: 8 -*-*/
#include <errno.h>
#include <libudev.h>
#include "unit.h"
#include "device.h"
#include "strv.h"
#include "log.h"
static void device_done(Unit *u) {
Device *d = DEVICE(u);
assert(d);
free(d->sysfs);
}
static void device_dump(Unit *u, FILE *f, const char *prefix) {
static const char* const state_table[_DEVICE_STATE_MAX] = {
[DEVICE_DEAD] = "dead",
[DEVICE_AVAILABLE] = "available"
};
Device *d = DEVICE(u);
assert(d);
fprintf(f,
"%sDevice State: %s\n"
"%sSysfs Path: %s\n",
prefix, state_table[d->state],
prefix, d->sysfs);
}
static int device_add_escaped_name(Unit *u, const char *dn) {
char *e;
int r;
assert(u);
assert(dn);
assert(dn[0] == '/');
if (!(e = unit_name_escape_path(dn+1, ".device")))
return -ENOMEM;
r = unit_add_name(u, e);
free(e);
if (r < 0 && r != -EEXIST)
return r;
return 0;
}
static int device_process_device(Manager *m, struct udev_device *dev) {
const char *dn, *names, *wants, *sysfs;
Unit *u = NULL;
int r;
char *e, *w, *state;
size_t l;
bool delete;
struct udev_list_entry *item = NULL, *first = NULL;
assert(m);
/* Check whether this entry is even relevant for us. */
dn = udev_device_get_devnode(dev);
names = udev_device_get_property_value(dev, "SYSTEMD_NAMES");
wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
if (!dn && !names && !wants)
return 0;
/* Ok, seems kinda interesting. Now, let's see if this one
* already exists. */
if (!(sysfs = udev_device_get_syspath(dev)))
return -ENOMEM;
assert(sysfs[0] == '/');
if (!(e = unit_name_escape_path(sysfs+1, ".device")))
return -ENOMEM;
if (!(u = manager_get_unit(m, e))) {
const char *model;
delete = true;
if (!(u = unit_new(m))) {
free(e);
return -ENOMEM;
}
r = unit_add_name(u, e);
free(e);
if (r < 0)
goto fail;
if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
r = -ENOMEM;
goto fail;
}
if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) ||
(model = udev_device_get_property_value(dev, "ID_MODEL")))
if (!(u->meta.description = strdup(model))) {
r = -ENOMEM;
goto fail;
}
} else {
delete = false;
free(e);
}
if (dn)
if ((r = device_add_escaped_name(u, dn)) < 0)
goto fail;
first = udev_device_get_devlinks_list_entry(dev);
udev_list_entry_foreach(item, first)
if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item))) < 0)
goto fail;
if (names) {
FOREACH_WORD(w, l, names, state) {
if (!(e = strndup(w, l)))
goto fail;
r = unit_add_name(u, e);
free(e);
if (r < 0 && r != -EEXIST)
goto fail;
}
}
if (set_isempty(u->meta.names)) {
r = -EEXIST;
goto fail;
}
if (wants) {
FOREACH_WORD(w, l, wants, state) {
if (!(e = strndup(w, l)))
goto fail;
r = unit_add_dependency_by_name(u, UNIT_WANTS, e);
free(e);
if (r < 0)
goto fail;
}
}
unit_add_to_load_queue(u);
return 0;
fail:
if (delete && u)
unit_free(u);
return r;
}
static int device_process_path(Manager *m, const char *path) {
int r;
struct udev_device *dev;
assert(m);
assert(path);
if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
log_warning("Failed to get udev device object from udev for path %s.", path);
return -ENOMEM;
}
r = device_process_device(m, dev);
udev_device_unref(dev);
return r;
}
static void device_shutdown(Manager *m) {
assert(m);
if (m->udev)
udev_unref(m->udev);
}
static int device_enumerate(Manager *m) {
int r;
struct udev_enumerate *e = NULL;
struct udev_list_entry *item = NULL, *first = NULL;
assert(m);
if (!(m->udev = udev_new()))
return -ENOMEM;
if (!(e = udev_enumerate_new(m->udev))) {
r = -ENOMEM;
goto fail;
}
if (udev_enumerate_scan_devices(e) < 0) {
r = -EIO;
goto fail;
}
first = udev_enumerate_get_list_entry(e);
udev_list_entry_foreach(item, first)
device_process_path(m, udev_list_entry_get_name(item));
udev_enumerate_unref(e);
return 0;
fail:
if (e)
udev_enumerate_unref(e);
device_shutdown(m);
return r;
}
static UnitActiveState device_active_state(Unit *u) {
return DEVICE(u)->state == DEVICE_DEAD ? UNIT_INACTIVE : UNIT_ACTIVE;
}
const UnitVTable device_vtable = {
.suffix = ".device",
.init = unit_load_fragment_and_dropin,
.done = device_done,
.dump = device_dump,
.enumerate = device_enumerate,
.shutdown = device_shutdown,
.active_state = device_active_state
};
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