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|
/*-*- Mode: C; c-basic-offset: 8 -*-*/
#include <assert.h>
#include <errno.h>
#include <string.h>
#include "manager.h"
#include "hashmap.h"
#include "macro.h"
#include "strv.h"
#include "load-fragment.h"
Manager* manager_new(void) {
Manager *m;
if (!(m = new0(Manager, 1)))
return NULL;
if (!(m->names = hashmap_new(string_hash_func, string_compare_func)))
goto fail;
if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
goto fail;
if (!(m->jobs_to_add = hashmap_new(trivial_hash_func, trivial_compare_func)))
goto fail;
if (!(m->jobs_to_remove = set_new(trivial_hash_func, trivial_compare_func)))
goto fail;
return m;
fail:
manager_free(m);
return NULL;
}
void manager_free(Manager *m) {
Name *n;
assert(m);
while ((n = hashmap_first(m->names)))
name_free(n);
hashmap_free(m->names);
hashmap_free(m->jobs);
/* FIXME: This is incomplete */
hashmap_free(m->jobs_to_add);
set_free(m->jobs_to_remove);
free(m);
}
int manager_add_job(Manager *m, JobType type, Name *name, JobMode mode, Job **_ret) {
Job *ret, *other;
void *state;
Name *dep;
int r;
assert(m);
assert(type < _JOB_TYPE_MAX);
assert(name);
assert(mode < _JOB_MODE_MAX);
assert(_ret);
/* Check for conflicts, first against the jobs we shall
* create */
if ((other = hashmap_get(m->jobs_to_add, name))) {
if (other->type != type)
return -EEXIST;
} else if (name->meta.job) {
if (name->meta.job->type != type) {
if (mode == JOB_FAIL)
return -EEXIST;
if ((r = set_put(m->jobs_to_remove, name->meta.job)) < 0)
return r;
}
}
if (!(ret = job_new(m, type, name)))
return -ENOMEM;
if ((r = hashmap_put(m->jobs_to_add, name, ret)) < 0)
goto fail;
if (type == JOB_START || type == JOB_VERIFY_STARTED || type == JOB_RESTART_FINISH) {
SET_FOREACH(dep, ret->name->meta.dependencies[NAME_REQUIRES], state)
if ((r = manager_add_job(m, type, dep, mode, NULL)) < 0)
goto fail;
SET_FOREACH(dep, ret->name->meta.dependencies[NAME_SOFT_REQUIRES], state)
if ((r = manager_add_job(m, type, dep, JOB_FAIL, NULL)) < 0)
goto fail;
SET_FOREACH(dep, ret->name->meta.dependencies[NAME_WANTS], state)
if ((r = manager_add_job(m, type, dep, JOB_FAIL, NULL)) < 0)
goto fail;
SET_FOREACH(dep, ret->name->meta.dependencies[NAME_REQUISITE], state)
if ((r = manager_add_job(m, JOB_VERIFY_STARTED, dep, mode, NULL)) < 0)
goto fail;
SET_FOREACH(dep, ret->name->meta.dependencies[NAME_SOFT_REQUISITE], state)
if ((r = manager_add_job(m, JOB_VERIFY_STARTED, dep, JOB_FAIL, NULL)) < 0)
goto fail;
SET_FOREACH(dep, ret->name->meta.dependencies[NAME_CONFLICTS], state)
if ((r = manager_add_job(m, type, dep, mode, NULL)) < 0)
goto fail;
} else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
SET_FOREACH(dep, ret->name->meta.dependencies[NAME_REQUIRED_BY], state)
if ((r = manager_add_job(m, type, dep, mode, NULL)) < 0)
goto fail;
}
if (_ret)
*_ret = ret;
return 0;
fail:
job_free(ret);
return r;
}
Job *manager_get_job(Manager *m, uint32_t id) {
assert(m);
return hashmap_get(m->jobs, UINT32_TO_PTR(id));
}
Name *manager_get_name(Manager *m, const char *name) {
assert(m);
assert(name);
return hashmap_get(m->names, name);
}
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 0;
}
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;
}
static int 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;
name->meta.state = NAME_LOADED;
return 0;
}
static int dispatch_load_queue(Manager *m) {
Meta *meta;
assert(m);
/* Make sure we are not run recursively */
if (m->dispatching_load_queue)
return 0;
m->dispatching_load_queue = true;
/* Dispatches the load queue. Takes a name from the queue and
* tries to load its data until the queue is empty */
while ((meta = m->load_queue)) {
load(NAME(meta));
LIST_REMOVE(Meta, m->load_queue, meta);
}
m->dispatching_load_queue = false;
return 0;
}
int manager_load_name(Manager *m, const char *name, Name **_ret) {
Name *ret;
NameType t;
int r;
char *n;
assert(m);
assert(name);
assert(_ret);
if (!name_is_valid(name))
return -EINVAL;
/* This will load the service information files, but not actually
* start any services or anything */
if ((ret = manager_get_name(m, name)))
goto finish;
if ((t = name_type_from_string(name)) == _NAME_TYPE_INVALID)
return -EINVAL;
if (!(ret = name_new(m)))
return -ENOMEM;
ret->meta.type = t;
if (!(n = strdup(name))) {
name_free(ret);
return -ENOMEM;
}
if (set_put(ret->meta.names, n) < 0) {
name_free(ret);
free(n);
return -ENOMEM;
}
if ((r = name_link(ret)) < 0) {
name_free(ret);
return r;
}
/* At this point the new entry is created and linked. However,
* not loaded. Now load this entry and all its dependencies
* recursively */
dispatch_load_queue(m);
finish:
*_ret = ret;
return 0;
}
|
