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machined: optionally, allow registration of pre-existing units (scopes

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or services) as machine with machined
This commit is contained in:
Lennart Poettering 2014-02-11 17:15:38 +01:00
parent 2d2ebd6b8f
commit 89f7c8465c
9 changed files with 224 additions and 88 deletions
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28
man/systemd-nspawn.xml
View File

@ -465,8 +465,8 @@
should be enabled when the container
runs a full Operating System (more
specifically: an init system), and is
useful to ensure the container is
accesible via
useful to ensure that the container is
accessible via
<citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
and shown by tools such as
<citerefentry><refentrytitle>ps</refentrytitle><manvolnum>1</manvolnum></citerefentry>. If
@ -478,6 +478,30 @@
<option>--register=no</option>.
</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--keep-unit</option></term>
<listitem><para>Instead of creating a
transient scope unit to run the
container in, simply register the
service or scope unit
<command>systemd-nspawn</command> has
been invoked in in
<citerefentry><refentrytitle>systemd-machined</refentrytitle><manvolnum>8</manvolnum></citerefentry>. This
has no effect if
<option>--register=no</option> is
used. This switch should be used if
<command>systemd-nspawn</command> is
invoked from within an a service unit,
and the service unit's sole purpose
is to run a single
<command>systemd-nspawn</command>
container. This option is not
available if run from a user
session.</para></listitem>
</varlistentry>
</variablelist>
</refsect1>

27
src/login/sd-login.c
View File

@ -630,7 +630,32 @@ _public_ int sd_get_uids(uid_t **users) {
}
_public_ int sd_get_machine_names(char ***machines) {
return get_files_in_directory("/run/systemd/machines/", machines);
char **l = NULL, **a, **b;
int r;
r = get_files_in_directory("/run/systemd/machines/", &l);
if (r < 0)
return r;
if (l) {
r = 0;
/* Filter out the unit: symlinks */
for (a = l, b = l; *a; a++) {
if (startswith(*a, "unit:"))
free(*a);
else {
*b = *a;
b++;
r++;
}
}
*b = NULL;
}
*machines = l;
return r;
}
static inline int MONITOR_TO_FD(sd_login_monitor *m) {

3
src/machine/machine-dbus.c
View File

@ -132,7 +132,8 @@ const sd_bus_vtable machine_vtable[] = {
SD_BUS_PROPERTY("Id", "ay", property_get_id, 0, SD_BUS_VTABLE_PROPERTY_CONST),
BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(Machine, timestamp), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Service", "s", NULL, offsetof(Machine, service), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Scope", "s", NULL, offsetof(Machine, scope), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Unit", "s", NULL, offsetof(Machine, unit), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Scope", "s", NULL, offsetof(Machine, unit), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
SD_BUS_PROPERTY("Leader", "u", NULL, offsetof(Machine, leader), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Class", "s", property_get_class, offsetof(Machine, class), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("RootDirectory", "s", NULL, offsetof(Machine, root_directory), SD_BUS_VTABLE_PROPERTY_CONST),

57
src/machine/machine.c
View File

@ -76,9 +76,9 @@ void machine_free(Machine *m) {
if (m->in_gc_queue)
LIST_REMOVE(gc_queue, m->manager->machine_gc_queue, m);
if (m->scope) {
hashmap_remove(m->manager->machine_units, m->scope);
free(m->scope);
if (m->unit) {
hashmap_remove(m->manager->machine_units, m->unit);
free(m->unit);
}
free(m->scope_job);
@ -123,8 +123,8 @@ int machine_save(Machine *m) {
"NAME=%s\n",
m->name);
if (m->scope)
fprintf(f, "SCOPE=%s\n", m->scope);
if (m->unit)
fprintf(f, "SCOPE=%s\n", m->unit); /* We continue to call this "SCOPE=" because it is internal only, and we want to stay compatible with old files */
if (m->scope_job)
fprintf(f, "SCOPE_JOB=%s\n", m->scope_job);
@ -159,6 +159,16 @@ int machine_save(Machine *m) {
unlink(temp_path);
}
if (m->unit) {
char *sl;
/* Create a symlink from the unit name to the machine
* name, so that we can quickly find the machine for
* each given unit */
sl = strappenda("/run/systemd/machines/unit:", m->unit);
symlink(m->name, sl);
}
finish:
if (r < 0)
log_error("Failed to save machine data %s: %s", m->state_file, strerror(-r));
@ -166,6 +176,21 @@ finish:
return r;
}
static void machine_unlink(Machine *m) {
assert(m);
if (m->unit) {
char *sl;
sl = strappenda("/run/systemd/machines/unit:", m->unit);
unlink(sl);
}
if (m->state_file)
unlink(m->state_file);
}
int machine_load(Machine *m) {
_cleanup_free_ char *realtime = NULL, *monotonic = NULL, *id = NULL, *leader = NULL, *class = NULL;
int r;
@ -173,7 +198,7 @@ int machine_load(Machine *m) {
assert(m);
r = parse_env_file(m->state_file, NEWLINE,
"SCOPE", &m->scope,
"SCOPE", &m->unit,
"SCOPE_JOB", &m->scope_job,
"SERVICE", &m->service,
"ROOT", &m->root_directory,
@ -225,7 +250,7 @@ static int machine_start_scope(Machine *m, sd_bus_message *properties, sd_bus_er
assert(m);
if (!m->scope) {
if (!m->unit) {
_cleanup_free_ char *escaped = NULL;
char *scope, *description, *job;
@ -245,15 +270,15 @@ static int machine_start_scope(Machine *m, sd_bus_message *properties, sd_bus_er
free(scope);
return r;
} else {
m->scope = scope;
m->unit = scope;
free(m->scope_job);
m->scope_job = job;
}
}
if (m->scope)
hashmap_put(m->manager->machine_units, m->scope, m);
if (m->unit)
hashmap_put(m->manager->machine_units, m->unit, m);
return r;
}
@ -302,10 +327,10 @@ static int machine_stop_scope(Machine *m) {
assert(m);
if (!m->scope)
if (!m->unit)
return 0;
r = manager_stop_unit(m->manager, m->scope, &error, &job);
r = manager_stop_unit(m->manager, m->unit, &error, &job);
if (r < 0) {
log_error("Failed to stop machine scope: %s", bus_error_message(&error, r));
return r;
@ -334,7 +359,7 @@ int machine_stop(Machine *m) {
if (k < 0)
r = k;
unlink(m->state_file);
machine_unlink(m);
machine_add_to_gc_queue(m);
if (m->started)
@ -354,7 +379,7 @@ bool machine_check_gc(Machine *m, bool drop_not_started) {
if (m->scope_job && manager_job_is_active(m->manager, m->scope_job))
return true;
if (m->scope && manager_unit_is_active(m->manager, m->scope))
if (m->unit && manager_unit_is_active(m->manager, m->unit))
return true;
return false;
@ -382,10 +407,10 @@ MachineState machine_get_state(Machine *s) {
int machine_kill(Machine *m, KillWho who, int signo) {
assert(m);
if (!m->scope)
if (!m->unit)
return -ESRCH;
return manager_kill_unit(m->manager, m->scope, who, signo, NULL);
return manager_kill_unit(m->manager, m->unit, who, signo, NULL);
}
static const char* const machine_class_table[_MACHINE_CLASS_MAX] = {

2
src/machine/machine.h
View File

@ -63,7 +63,7 @@ struct Machine {
char *service;
char *root_directory;
char *scope;
char *unit;
char *scope_job;
pid_t leader;

16
src/machine/machinectl.c
View File

@ -107,7 +107,7 @@ static int list_machines(sd_bus *bus, char **args, unsigned n) {
return 0;
}
static int show_scope_cgroup(sd_bus *bus, const char *unit, pid_t leader) {
static int show_unit_cgroup(sd_bus *bus, const char *unit, pid_t leader) {
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_free_ char *path = NULL;
@ -129,7 +129,7 @@ static int show_scope_cgroup(sd_bus *bus, const char *unit, pid_t leader) {
bus,
"org.freedesktop.systemd1",
path,
"org.freedesktop.systemd1.Scope",
endswith(unit, ".scope") ? "org.freedesktop.systemd1.Scope" : "org.freedesktop.systemd1.Service",
"ControlGroup",
&error,
&reply,
@ -168,7 +168,7 @@ typedef struct MachineStatusInfo {
sd_id128_t id;
char *class;
char *service;
char *scope;
char *unit;
char *root_directory;
pid_t leader;
usec_t timestamp;
@ -219,9 +219,9 @@ static void print_machine_status_info(sd_bus *bus, MachineStatusInfo *i) {
if (i->root_directory)
printf("\t Root: %s\n", i->root_directory);
if (i->scope) {
printf("\t Unit: %s\n", i->scope);
show_scope_cgroup(bus, i->scope, i->leader);
if (i->unit) {
printf("\t Unit: %s\n", i->unit);
show_unit_cgroup(bus, i->unit, i->leader);
}
}
@ -231,7 +231,7 @@ static int show_info(const char *verb, sd_bus *bus, const char *path, bool *new_
{ "Name", "s", NULL, offsetof(MachineStatusInfo, name) },
{ "Class", "s", NULL, offsetof(MachineStatusInfo, class) },
{ "Service", "s", NULL, offsetof(MachineStatusInfo, service) },
{ "Scope", "s", NULL, offsetof(MachineStatusInfo, scope) },
{ "Unit", "s", NULL, offsetof(MachineStatusInfo, unit) },
{ "RootDirectory", "s", NULL, offsetof(MachineStatusInfo, root_directory) },
{ "Leader", "u", NULL, offsetof(MachineStatusInfo, leader) },
{ "Timestamp", "t", NULL, offsetof(MachineStatusInfo, timestamp) },
@ -264,7 +264,7 @@ static int show_info(const char *verb, sd_bus *bus, const char *path, bool *new_
free(info.name);
free(info.class);
free(info.service);
free(info.scope);
free(info.unit);
free(info.root_directory);
return r;

75
src/machine/machined-dbus.c
View File

@ -169,9 +169,8 @@ static int method_list_machines(sd_bus *bus, sd_bus_message *message, void *user
return sd_bus_send(bus, reply, NULL);
}
static int method_create_machine(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
static int method_create_or_register_machine(Manager *manager, sd_bus_message *message, Machine **_m, sd_bus_error *error) {
const char *name, *service, *class, *root_directory;
Manager *manager = userdata;
MachineClass c;
uint32_t leader;
sd_id128_t id;
@ -180,9 +179,9 @@ static int method_create_machine(sd_bus *bus, sd_bus_message *message, void *use
size_t n;
int r;
assert(bus);
assert(message);
assert(manager);
assert(message);
assert(_m);
r = sd_bus_message_read(message, "s", &name);
if (r < 0)
@ -218,10 +217,6 @@ static int method_create_machine(sd_bus *bus, sd_bus_message *message, void *use
if (!isempty(root_directory) && !path_is_absolute(root_directory))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Root directory must be empty or an absolute path");
r = sd_bus_message_enter_container(message, 'a', "(sv)");
if (r < 0)
return r;
if (leader == 0) {
_cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
@ -263,17 +258,70 @@ static int method_create_machine(sd_bus *bus, sd_bus_message *message, void *use
}
}
r = machine_start(m, message, error);
if (r < 0)
goto fail;
m->create_message = sd_bus_message_ref(message);
*_m = m;
return 1;
fail:
machine_add_to_gc_queue(m);
return r;
}
static int method_create_machine(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *manager = userdata;
Machine *m = NULL;
int r;
r = method_create_or_register_machine(manager, message, &m, error);
if (r < 0)
return r;
r = sd_bus_message_enter_container(message, 'a', "(sv)");
if (r < 0)
goto fail;
r = machine_start(m, message, error);
if (r < 0)
goto fail;
m->create_message = sd_bus_message_ref(message);
return 1;
fail:
machine_add_to_gc_queue(m);
return r;
}
static int method_register_machine(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *manager = userdata;
_cleanup_free_ char *p = NULL;
Machine *m = NULL;
int r;
r = method_create_or_register_machine(manager, message, &m, error);
if (r < 0)
return r;
r = cg_pid_get_unit(m->leader, &m->unit);
if (r < 0) {
r = sd_bus_error_set_errnof(error, r, "Failed to determine unit of process "PID_FMT" : %s", m->leader, strerror(-r));
goto fail;
}
r = machine_start(m, NULL, error);
if (r < 0)
goto fail;
p = machine_bus_path(m);
if (!p) {
r = -ENOMEM;
goto fail;
}
return sd_bus_reply_method_return(message, "o", p);
fail:
machine_add_to_gc_queue(m);
return r;
}
@ -347,6 +395,7 @@ const sd_bus_vtable manager_vtable[] = {
SD_BUS_METHOD("GetMachineByPID", "u", "o", method_get_machine_by_pid, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("ListMachines", NULL, "a(ssso)", method_list_machines, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("CreateMachine", "sayssusa(sv)", "o", method_create_machine, 0),
SD_BUS_METHOD("RegisterMachine", "sayssus", "o", method_register_machine, 0),
SD_BUS_METHOD("KillMachine", "ssi", NULL, method_kill_machine, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)),
SD_BUS_METHOD("TerminateMachine", "s", NULL, method_terminate_machine, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)),
SD_BUS_SIGNAL("MachineNew", "so", 0),

67
src/nspawn/nspawn.c
View File

@ -120,6 +120,7 @@ static char **arg_setenv = NULL;
static bool arg_quiet = false;
static bool arg_share_system = false;
static bool arg_register = true;
static bool arg_keep_unit = false;
static int help(void) {
@ -152,6 +153,8 @@ static int help(void) {
" --bind-ro=PATH[:PATH] Similar, but creates a read-only bind mount\n"
" --setenv=NAME=VALUE Pass an environment variable to PID 1\n"
" --register=BOOLEAN Register container as machine\n"
" --keep-unit Do not register a scope for the machine, reuse\n"
" the service unit nspawn is running in\n"
" -q --quiet Do not show status information\n",
program_invocation_short_name);
@ -172,7 +175,8 @@ static int parse_argv(int argc, char *argv[]) {
ARG_BIND_RO,
ARG_SETENV,
ARG_SHARE_SYSTEM,
ARG_REGISTER
ARG_REGISTER,
ARG_KEEP_UNIT
};
static const struct option options[] = {
@ -197,6 +201,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "quiet", no_argument, NULL, 'q' },
{ "share-system", no_argument, NULL, ARG_SHARE_SYSTEM },
{ "register", required_argument, NULL, ARG_REGISTER },
{ "keep-unit", no_argument, NULL, ARG_KEEP_UNIT },
{}
};
@ -410,6 +415,10 @@ static int parse_argv(int argc, char *argv[]) {
arg_register = r;
break;
case ARG_KEEP_UNIT:
arg_keep_unit = true;
break;
case '?':
return -EINVAL;
@ -426,6 +435,11 @@ static int parse_argv(int argc, char *argv[]) {
return -EINVAL;
}
if (arg_keep_unit && cg_pid_get_owner_uid(0, NULL) >= 0) {
log_error("--keep-unit may not be used when invoked from a user session.");
return -EINVAL;
}
return 1;
}
@ -1086,22 +1100,41 @@ static int register_machine(pid_t pid) {
return r;
}
r = sd_bus_call_method(
bus,
"org.freedesktop.machine1",
"/org/freedesktop/machine1",
"org.freedesktop.machine1.Manager",
"CreateMachine",
&error,
NULL,
"sayssusa(sv)",
arg_machine,
SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
"nspawn",
"container",
(uint32_t) pid,
strempty(arg_directory),
!isempty(arg_slice), "Slice", "s", arg_slice);
if (arg_keep_unit) {
r = sd_bus_call_method(
bus,
"org.freedesktop.machine1",
"/org/freedesktop/machine1",
"org.freedesktop.machine1.Manager",
"RegisterMachine",
&error,
NULL,
"sayssus",
arg_machine,
SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
"nspawn",
"container",
(uint32_t) pid,
strempty(arg_directory));
} else {
r = sd_bus_call_method(
bus,
"org.freedesktop.machine1",
"/org/freedesktop/machine1",
"org.freedesktop.machine1.Manager",
"CreateMachine",
&error,
NULL,
"sayssusa(sv)",
arg_machine,
SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
"nspawn",
"container",
(uint32_t) pid,
strempty(arg_directory),
!isempty(arg_slice), "Slice", "s", arg_slice);
}
if (r < 0) {
log_error("Failed to register machine: %s", bus_error_message(&error, r));
return r;

37
src/shared/cgroup-util.c
View File

@ -1282,39 +1282,18 @@ int cg_pid_get_user_unit(pid_t pid, char **unit) {
}
int cg_path_get_machine_name(const char *path, char **machine) {
const char *e, *n, *x;
char *s, *r;
size_t l;
_cleanup_free_ char *u = NULL, *sl = NULL;
int r;
assert(path);
assert(machine);
r = cg_path_get_unit(path, &u);
if (r < 0)
return r;
/* Skip slices, if there are any */
e = skip_slices(path);
n = strchrnul(e, '/');
if (e == n)
return -ENOENT;
s = strndupa(e, n - e);
s = cg_unescape(s);
x = startswith(s, "machine-");
if (!x)
return -ENOENT;
if (!endswith(x, ".scope"))
return -ENOENT;
l = strlen(x);
if (l <= 6)
return -ENOENT;
r = strndup(x, l - 6);
if (!r)
sl = strjoin("/run/systemd/machines/unit:", u, NULL);
if (!sl)
return -ENOMEM;
*machine = r;
return 0;
return readlink_malloc(sl, machine);
}
int cg_pid_get_machine_name(pid_t pid, char **machine) {