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systemd-stable/name.c
Lennart Poettering 7fad411cb5 start implementing a test suite for the engine
2010-01-20 05:03:52 +01:00

652 lines
18 KiB
C
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/*-*- Mode: C; c-basic-offset: 8 -*-*/
#include <assert.h>
#include <errno.h>
#include <string.h>
#include "set.h"
#include "name.h"
#include "macro.h"
#include "strv.h"
#include "load-fragment.h"
NameType name_type_from_string(const char *n) {
NameType t;
static const char* suffixes[_NAME_TYPE_MAX] = {
[NAME_SERVICE] = ".service",
[NAME_TIMER] = ".timer",
[NAME_SOCKET] = ".socket",
[NAME_MILESTONE] = ".milestone",
[NAME_DEVICE] = ".device",
[NAME_MOUNT] = ".mount",
[NAME_AUTOMOUNT] = ".automount",
[NAME_SNAPSHOT] = ".snapshot",
};
assert(n);
for (t = 0; t < _NAME_TYPE_MAX; t++)
if (endswith(n, suffixes[t]))
return t;
return _NAME_TYPE_INVALID;
}
#define VALID_CHARS \
"0123456789" \
"abcdefghijklmnopqrstuvwxyz" \
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
"-_"
bool name_is_valid(const char *n) {
NameType t;
const char *e, *i;
assert(n);
t = name_type_from_string(n);
if (t < 0 || t >= _NAME_TYPE_MAX)
return false;
if (!(e = strrchr(n, '.')))
return false;
for (i = n; i < e; i++)
if (!strchr(VALID_CHARS, *i))
return false;
return true;
}
Name *name_new(Manager *m) {
Name *n;
assert(m);
if (!(n = new0(Name, 1)))
return NULL;
if (!(n->meta.names = set_new(string_hash_func, string_compare_func))) {
free(n);
return NULL;
}
/* Not much initialization happening here at this time */
n->meta.manager = m;
n->meta.type = _NAME_TYPE_INVALID;
n->meta.state = NAME_STUB;
/* We don't link the name here, that is left for name_link() */
return n;
}
/* FIXME: Does not rollback on failure! */
int name_link_names(Name *n, bool replace) {
char *t;
void *state;
int r;
assert(n);
if (!n->meta.linked)
return 0;
/* Link all names that aren't linked yet. */
SET_FOREACH(t, n->meta.names, state)
if (replace) {
if ((r = hashmap_replace(n->meta.manager->names, t, n)) < 0)
return r;
} else {
if ((r = hashmap_put(n->meta.manager->names, t, n)) < 0)
return r;
}
return 0;
}
int name_link(Name *n) {
int r;
assert(n);
assert(!set_isempty(n->meta.names));
assert(!n->meta.linked);
if ((r = name_sanitize(n)) < 0)
return r;
n->meta.linked = true;
if ((r = name_link_names(n, false)) < 0) {
char *t;
void *state;
/* Rollback the registered names */
SET_FOREACH(t, n->meta.names, state)
hashmap_remove_value(n->meta.manager->names, t, n);
n->meta.linked = false;
return r;
}
if (n->meta.state == NAME_STUB)
LIST_PREPEND(Meta, n->meta.manager->load_queue, &n->meta);
return 0;
}
static void bidi_set_free(Name *name, Set *s) {
void *state;
Name *other;
assert(name);
/* Frees the set and makes sure we are dropped from the
* inverse pointers */
SET_FOREACH(other, s, state) {
NameDependency d;
for (d = 0; d < _NAME_DEPENDENCY_MAX; d++)
set_remove(other->meta.dependencies[d], name);
}
set_free(s);
}
void name_free(Name *name) {
NameDependency d;
char *t;
assert(name);
/* Detach from next 'bigger' objects */
if (name->meta.linked) {
char *t;
void *state;
SET_FOREACH(t, name->meta.names, state)
hashmap_remove_value(name->meta.manager->names, t, name);
if (name->meta.state == NAME_STUB)
LIST_REMOVE(Meta, name->meta.manager->load_queue, &name->meta);
}
/* Free data and next 'smaller' objects */
if (name->meta.job)
job_free(name->meta.job);
for (d = 0; d < _NAME_DEPENDENCY_MAX; d++)
bidi_set_free(name, name->meta.dependencies[d]);
switch (name->meta.type) {
case NAME_SOCKET: {
unsigned i;
Socket *s = SOCKET(name);
for (i = 0; i < s->n_fds; i++)
close_nointr(s->fds[i]);
break;
}
case NAME_DEVICE: {
Device *d = DEVICE(name);
free(d->sysfs);
break;
}
case NAME_MOUNT: {
Mount *m = MOUNT(name);
free(m->path);
break;
}
case NAME_AUTOMOUNT: {
Automount *a = AUTOMOUNT(name);
free(a->path);
break;
}
default:
;
}
free(name->meta.description);
while ((t = set_steal_first(name->meta.names)))
free(t);
set_free(name->meta.names);
free(name);
}
bool name_is_ready(Name *name) {
assert(name);
if (name->meta.state != NAME_LOADED)
return false;
assert(name->meta.type < _NAME_TYPE_MAX);
switch (name->meta.type) {
case NAME_SERVICE: {
Service *s = SERVICE(name);
return
s->state == SERVICE_RUNNING ||
s->state == SERVICE_RELOAD_PRE ||
s->state == SERVICE_RELOAD ||
s->state == SERVICE_RELOAD_POST;
}
case NAME_TIMER: {
Timer *t = TIMER(name);
return
t->state == TIMER_WAITING ||
t->state == TIMER_RUNNING;
}
case NAME_SOCKET: {
Socket *s = SOCKET(name);
return
s->state == SOCKET_LISTENING ||
s->state == SOCKET_RUNNING;
}
case NAME_MILESTONE:
return MILESTONE(name)->state == MILESTONE_ACTIVE;
case NAME_DEVICE:
return DEVICE(name)->state == DEVICE_AVAILABLE;
case NAME_MOUNT:
return MOUNT(name)->state == MOUNT_MOUNTED;
case NAME_AUTOMOUNT: {
Automount *a = AUTOMOUNT(name);
return
a->state == AUTOMOUNT_WAITING ||
a->state == AUTOMOUNT_RUNNING;
}
case NAME_SNAPSHOT:
return SNAPSHOT(name)->state == SNAPSHOT_ACTIVE;
case _NAME_TYPE_MAX:
case _NAME_TYPE_INVALID:
;
}
assert_not_reached("Unknown name type.");
return false;
}
static int ensure_in_set(Set **s, void *data) {
int r;
assert(s);
assert(data);
if (!*s)
if (!(*s = set_new(trivial_hash_func, trivial_compare_func)))
return -ENOMEM;
if ((r = set_put(*s, data)) < 0)
if (r != -EEXIST)
return r;
return 0;
}
static int ensure_merge(Set **s, Set *other) {
if (!other)
return 0;
if (*s)
return set_merge(*s, other);
if (!(*s = set_copy(other)))
return -ENOMEM;
return 0;
}
/* FIXME: Does not rollback on failure! */
int name_merge(Name *name, Name *other) {
int r;
NameDependency d;
assert(name);
assert(other);
assert(name->meta.manager == other->meta.manager);
/* This merges 'other' into 'name'. FIXME: This does not
* rollback on failure. */
if (name->meta.type != other->meta.type)
return -EINVAL;
if (other->meta.state != NAME_STUB)
return -EINVAL;
/* Merge names */
if ((r = ensure_merge(&name->meta.names, other->meta.names)) < 0)
return r;
/* Merge dependencies */
for (d = 0; d < _NAME_DEPENDENCY_MAX; d++)
if ((r = ensure_merge(&name->meta.dependencies[d], other->meta.dependencies[d])) < 0)
return r;
/* Hookup new deps and names */
if (name->meta.linked) {
if ((r = name_sanitize(name)) < 0)
return r;
if ((r = name_link_names(name, true)) < 0)
return r;
}
return 0;
}
/* FIXME: Does not rollback on failure! */
static int augment(Name *n) {
int r;
void* state;
Name *other;
assert(n);
/* Adds in the missing links to make all dependencies
* bidirectional. */
SET_FOREACH(other, n->meta.dependencies[NAME_BEFORE], state)
if ((r = ensure_in_set(&other->meta.dependencies[NAME_AFTER], n)) < 0)
return r;
SET_FOREACH(other, n->meta.dependencies[NAME_AFTER], state)
if ((r = ensure_in_set(&other->meta.dependencies[NAME_BEFORE], n)) < 0)
return r;
SET_FOREACH(other, n->meta.dependencies[NAME_CONFLICTS], state)
if ((r = ensure_in_set(&other->meta.dependencies[NAME_CONFLICTS], n)) < 0)
return r;
SET_FOREACH(other, n->meta.dependencies[NAME_REQUIRES], state)
if ((r = ensure_in_set(&other->meta.dependencies[NAME_REQUIRED_BY], n)) < 0)
return r;
SET_FOREACH(other, n->meta.dependencies[NAME_REQUISITE], state)
if ((r = ensure_in_set(&other->meta.dependencies[NAME_REQUIRED_BY], n)) < 0)
return r;
SET_FOREACH(other, n->meta.dependencies[NAME_WANTS], state)
if ((r = ensure_in_set(&other->meta.dependencies[NAME_WANTED_BY], n)) < 0)
return r;
SET_FOREACH(other, n->meta.dependencies[NAME_SOFT_REQUIRES], state)
if ((r = ensure_in_set(&other->meta.dependencies[NAME_WANTED_BY], n)) < 0)
return r;
SET_FOREACH(other, n->meta.dependencies[NAME_SOFT_REQUISITE], state)
if ((r = ensure_in_set(&other->meta.dependencies[NAME_WANTED_BY], n)) < 0)
return r;
return 0;
}
int name_sanitize(Name *n) {
NameDependency d;
assert(n);
/* Remove loops */
for (d = 0; d < _NAME_DEPENDENCY_MAX; d++)
set_remove(n->meta.dependencies[d], n);
return augment(n);
}
const char* name_id(Name *n) {
assert(n);
return set_first(n->meta.names);
}
void name_dump(Name *n, FILE *f, const char *prefix) {
static const char* const state_table[_NAME_STATE_MAX] = {
[NAME_STUB] = "stub",
[NAME_LOADED] = "loaded",
[NAME_FAILED] = "failed"
};
static const char* const socket_state_table[_SOCKET_STATE_MAX] = {
[SOCKET_DEAD] = "dead",
[SOCKET_BEFORE] = "before",
[SOCKET_START_PRE] = "start-pre",
[SOCKET_START] = "start",
[SOCKET_START_POST] = "start-post",
[SOCKET_LISTENING] = "listening",
[SOCKET_RUNNING] = "running",
[SOCKET_STOP_PRE] = "stop-pre",
[SOCKET_STOP] = "stop",
[SOCKET_STOP_POST] = "stop-post",
[SOCKET_MAINTAINANCE] = "maintainance"
};
static const char* const dependency_table[_NAME_DEPENDENCY_MAX] = {
[NAME_REQUIRES] = "Requires",
[NAME_SOFT_REQUIRES] = "SoftRequires",
[NAME_WANTS] = "Wants",
[NAME_REQUISITE] = "Requisite",
[NAME_SOFT_REQUISITE] = "SoftRequisite",
[NAME_REQUIRED_BY] = "RequiredBy",
[NAME_WANTED_BY] = "WantedBy",
[NAME_CONFLICTS] = "Conflicts",
[NAME_BEFORE] = "Before",
[NAME_AFTER] = "After",
};
void *state;
char *t;
NameDependency d;
assert(n);
if (!prefix)
prefix = "";
fprintf(f,
"%sName %s:\n"
"%s\tDescription: %s\n"
"%s\tName State: %s\n",
prefix, name_id(n),
prefix, n->meta.description ? n->meta.description : name_id(n),
prefix, state_table[n->meta.state]);
fprintf(f, "%s\tNames: ", prefix);
SET_FOREACH(t, n->meta.names, state)
fprintf(f, "%s ", t);
fprintf(f, "\n");
for (d = 0; d < _NAME_DEPENDENCY_MAX; d++) {
void *state;
Name *other;
if (set_isempty(n->meta.dependencies[d]))
continue;
fprintf(f, "%s\t%s: ", prefix, dependency_table[d]);
SET_FOREACH(other, n->meta.dependencies[d], state)
fprintf(f, "%s ", name_id(other));
fprintf(f, "\n");
}
switch (n->meta.type) {
case NAME_SOCKET: {
int r;
char *s = NULL;
const char *t;
if ((r = address_print(&n->socket.address, &s)) < 0)
t = strerror(-r);
else
t = s;
fprintf(f,
"%s\tAddress: %s\n"
"%s\tSocket State: %s\n",
prefix, t,
prefix, socket_state_table[n->socket.state]);
free(s);
break;
}
default:
;
}
if (n->meta.job) {
char *p;
if (asprintf(&p, "%s\t", prefix) >= 0)
prefix = p;
else
p = NULL;
job_dump(n->meta.job, f, prefix);
free(p);
}
}
static int verify_type(Name *name) {
char *n;
void *state;
assert(name);
/* Checks that all aliases of this name have the same and valid type */
SET_FOREACH(n, name->meta.names, state) {
NameType t;
if ((t = name_type_from_string(n)) == _NAME_TYPE_INVALID)
return -EINVAL;
if (name->meta.type == _NAME_TYPE_INVALID) {
name->meta.type = t;
continue;
}
if (name->meta.type != t)
return -EINVAL;
}
if (name->meta.type == _NAME_TYPE_INVALID)
return -EINVAL;
return 0;
}
static int service_load_sysv(Service *s) {
assert(s);
/* Load service data from SysV init scripts, preferably with
* LSB headers ... */
return -ENOENT;
}
static int name_load_fstab(Name *n) {
assert(n);
assert(n->meta.type == NAME_MOUNT || n->meta.type == NAME_AUTOMOUNT);
/* Load mount data from /etc/fstab */
return 0;
}
static int snapshot_load(Snapshot *s) {
assert(s);
/* Load snapshots from disk */
return 0;
}
static int name_load_dropin(Name *n) {
assert(n);
/* Load dependencies from drop-in directories */
return 0;
}
int name_load(Name *name) {
int r;
assert(name);
if (name->meta.state != NAME_STUB)
return 0;
if ((r = verify_type(name)) < 0)
return r;
if (name->meta.type == NAME_SERVICE) {
/* Load a .service file */
if ((r = name_load_fragment(name)) == 0)
goto finish;
/* Load a classic init script */
if (r == -ENOENT)
if ((r = service_load_sysv(SERVICE(name))) == 0)
goto finish;
} else if (name->meta.type == NAME_MOUNT ||
name->meta.type == NAME_AUTOMOUNT) {
if ((r = name_load_fstab(name)) == 0)
goto finish;
} else if (name->meta.type == NAME_SNAPSHOT) {
if ((r = snapshot_load(SNAPSHOT(name))) == 0)
goto finish;
} else {
if ((r = name_load_fragment(name)) == 0)
goto finish;
}
name->meta.state = NAME_FAILED;
return r;
finish:
if ((r = name_load_dropin(name)) < 0)
return r;
if ((r = name_sanitize(name)) < 0)
return r;
if ((r = name_link_names(name, false)) < 0)
return r;
name->meta.state = NAME_LOADED;
return 0;
}
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