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Accepting request 380337 from home:jengelh:branches:Base:System

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- Add two patches which address logind/networkd disappearing from
  dbus (and busctl) even while the units and processes continue
  running.
  0001-core-fix-bus-name-synchronization-after-daemon-reloa.patch
  0001-core-re-sync-bus-name-list-after-deserializing-durin.patch

OBS-URL: https://build.opensuse.org/request/show/380337
OBS-URL: https://build.opensuse.org/package/show/Base:System/systemd?expand=0&rev=934
This commit is contained in:
Marcus Meissner 2016-03-29 15:52:23 +00:00 committed by Git OBS Bridge
parent 023ef9eec7
commit 527ef37082
6 changed files with 297 additions and 0 deletions
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193
0001-core-fix-bus-name-synchronization-after-daemon-reloa.patch Normal file
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@ -0,0 +1,193 @@
From d8ccf5fdc91c46ab5d0ae86e38c206bc508d4188 Mon Sep 17 00:00:00 2001 [> v228]
From: Daniel Mack <daniel@zonque.org>
Date: Fri, 18 Dec 2015 17:28:15 +0100
Subject: [PATCH] core: fix bus name synchronization after daemon-reload
During daemon-reload, PID1 temporarly loses its DBus connection, so there's
a small window in which all signals sent by dbus-daemon are lost.
This is a problem, since we rely on the NameOwnerChanged signals in order to
consider a service with Type=dbus fully started or terminated, respectively.
In order to fix this, a rewrite of bus_list_names() is necessary. We used
to walk the current list of names on the bus, and blindly triggered the
bus_name_owner_change() callback on each service, providing the actual name
as current owner. This implementation has a number of problems:
* We cannot detect if the the name was moved from one owner to the other
while we were reloading
* We don't notify services which missed the name loss signal
* Providing the actual name as current owner is a hack, as the comment also
admits.
To fix this, this patch carries the following changes:
* Track the name of the current bus name owner, and (de-)serialize it
during reload. This way, we can detect changes.
* In bus_list_names(), walk the list of bus names we're interested in
first, and then see if the name is active on the bus. If it is,
check it it's still the same as it used to be, and synthesize
NameOwnerChanged signals for the name add and/or loss.
This should fully synchronize the current name list with the internal
state of all services.
---
src/core/dbus.c | 64 +++++++++++++++++++++++++++++++++++++++++++++---------
src/core/service.c | 14 ++++++++++++
src/core/service.h | 1 +
3 files changed, 69 insertions(+), 10 deletions(-)
diff --git a/src/core/dbus.c b/src/core/dbus.c
index e7ee216..58069f5 100644
--- a/src/core/dbus.c
+++ b/src/core/dbus.c
@@ -736,7 +736,9 @@ static int bus_on_connection(sd_event_source *s, int fd, uint32_t revents, void
static int bus_list_names(Manager *m, sd_bus *bus) {
_cleanup_strv_free_ char **names = NULL;
- char **i;
+ const char *name;
+ Iterator i;
+ Unit *u;
int r;
assert(m);
@@ -746,15 +748,55 @@ static int bus_list_names(Manager *m, sd_bus *bus) {
if (r < 0)
return log_error_errno(r, "Failed to get initial list of names: %m");
- /* This is a bit hacky, we say the owner of the name is the
- * name itself, because we don't want the extra traffic to
- * figure out the real owner. */
- STRV_FOREACH(i, names) {
- Unit *u;
+ /* We have to synchronize the current bus names with the
+ * list of active services. To do this, walk the list of
+ * all units with bus names. */
+ HASHMAP_FOREACH_KEY(u, name, m->watch_bus, i) {
+ Service *s = SERVICE(u);
+
+ assert(s);
- u = hashmap_get(m->watch_bus, *i);
- if (u)
- UNIT_VTABLE(u)->bus_name_owner_change(u, *i, NULL, *i);
+ if (!streq_ptr(s->bus_name, name)) {
+ log_unit_warning(u, "Bus name has changed from %s → %s, ignoring.", s->bus_name, name);
+ continue;
+ }
+
+ /* Check if a service's bus name is in the list of currently
+ * active names */
+ if (strv_contains(names, name)) {
+ _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
+ const char *unique;
+
+ /* If it is, determine its current owner */
+ r = sd_bus_get_name_creds(bus, name, SD_BUS_CREDS_UNIQUE_NAME, &creds);
+ if (r < 0) {
+ log_error_errno(r, "Failed to get bus name owner %s: %m", name);
+ continue;
+ }
+
+ r = sd_bus_creds_get_unique_name(creds, &unique);
+ if (r < 0) {
+ log_error_errno(r, "Failed to get unique name for %s: %m", name);
+ continue;
+ }
+
+ /* Now, let's compare that to the previous bus owner, and
+ * if it's still the same, all is fine, so just don't
+ * bother the service. Otherwise, the name has apparently
+ * changed, so synthesize a name owner changed signal. */
+
+ if (!streq_ptr(unique, s->bus_name_owner))
+ UNIT_VTABLE(u)->bus_name_owner_change(u, name, s->bus_name_owner, unique);
+ } else {
+ /* So, the name we're watching is not on the bus.
+ * This either means it simply hasn't appeared yet,
+ * or it was lost during the daemon reload.
+ * Check if the service has a stored name owner,
+ * and synthesize a name loss signal in this case. */
+
+ if (s->bus_name_owner)
+ UNIT_VTABLE(u)->bus_name_owner_change(u, name, s->bus_name_owner, NULL);
+ }
}
return 0;
@@ -808,7 +850,9 @@ static int bus_setup_api(Manager *m, sd_bus *bus) {
if (r < 0)
return log_error_errno(r, "Failed to register name: %m");
- bus_list_names(m, bus);
+ r = bus_list_names(m, bus);
+ if (r < 0)
+ return r;
log_debug("Successfully connected to API bus.");
return 0;
diff --git a/src/core/service.c b/src/core/service.c
index 41a729c..c5b689a 100644
--- a/src/core/service.c
+++ b/src/core/service.c
@@ -323,6 +323,8 @@ static void service_done(Unit *u) {
s->bus_name = mfree(s->bus_name);
}
+ s->bus_name_owner = mfree(s->bus_name_owner);
+
s->bus_endpoint_fd = safe_close(s->bus_endpoint_fd);
service_close_socket_fd(s);
service_connection_unref(s);
@@ -2122,6 +2124,7 @@ static int service_serialize(Unit *u, FILE *f, FDSet *fds) {
unit_serialize_item(u, f, "main-pid-known", yes_no(s->main_pid_known));
unit_serialize_item(u, f, "bus-name-good", yes_no(s->bus_name_good));
+ unit_serialize_item(u, f, "bus-name-owner", s->bus_name_owner);
r = unit_serialize_item_escaped(u, f, "status-text", s->status_text);
if (r < 0)
@@ -2249,6 +2252,10 @@ static int service_deserialize_item(Unit *u, const char *key, const char *value,
log_unit_debug(u, "Failed to parse bus-name-good value: %s", value);
else
s->bus_name_good = b;
+ } else if (streq(key, "bus-name-owner")) {
+ r = free_and_strdup(&s->bus_name_owner, value);
+ if (r < 0)
+ log_unit_error_errno(u, r, "Unable to deserialize current bus owner %s: %m", value);
} else if (streq(key, "status-text")) {
char *t;
@@ -3134,6 +3141,13 @@ static void service_bus_name_owner_change(
s->bus_name_good = !!new_owner;
+ /* Track the current owner, so we can reconstruct changes after a daemon reload */
+ r = free_and_strdup(&s->bus_name_owner, new_owner);
+ if (r < 0) {
+ log_unit_error_errno(u, r, "Unable to set new bus name owner %s: %m", new_owner);
+ return;
+ }
+
if (s->type == SERVICE_DBUS) {
/* service_enter_running() will figure out what to
diff --git a/src/core/service.h b/src/core/service.h
index d0faad8..19efbcc 100644
--- a/src/core/service.h
+++ b/src/core/service.h
@@ -172,6 +172,7 @@ struct Service {
bool reset_cpu_usage:1;
char *bus_name;
+ char *bus_name_owner; /* unique name of the current owner */
char *status_text;
int status_errno;
--
2.6.2

74
0001-core-re-sync-bus-name-list-after-deserializing-durin.patch Normal file
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@ -0,0 +1,74 @@
From 8936a5e34dbfa9274348f3fef99f7c9f9327ddf9 Mon Sep 17 00:00:00 2001 [> v228]
From: Daniel Mack <daniel@zonque.org>
Date: Tue, 22 Dec 2015 11:37:09 +0100
Subject: [PATCH] core: re-sync bus name list after deserializing during
daemon-reload
When the daemon reloads, it doesn not actually give up its DBus connection,
as wrongly stated in an earlier commit. However, even though the bus
connection stays open, the daemon flushes out all its internal state.
Hence, if there is a NameOwnerChanged signal after the flush and before the
deserialization, it cannot be matched against any pending unit.
To fix this, rename bus_list_names() to manager_sync_bus_names() and call
it explicitly at the end of the daemon reload operation.
---
src/core/dbus.c | 4 ++--
src/core/dbus.h | 2 ++
src/core/manager.c | 4 ++++
3 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/src/core/dbus.c b/src/core/dbus.c
index 58069f5..1d89b9e 100644
--- a/src/core/dbus.c
+++ b/src/core/dbus.c
@@ -734,7 +734,7 @@ static int bus_on_connection(sd_event_source *s, int fd, uint32_t revents, void
return 0;
}
-static int bus_list_names(Manager *m, sd_bus *bus) {
+int manager_sync_bus_names(Manager *m, sd_bus *bus) {
_cleanup_strv_free_ char **names = NULL;
const char *name;
Iterator i;
@@ -850,7 +850,7 @@ static int bus_setup_api(Manager *m, sd_bus *bus) {
if (r < 0)
return log_error_errno(r, "Failed to register name: %m");
- r = bus_list_names(m, bus);
+ r = manager_sync_bus_names(m, bus);
if (r < 0)
return r;
diff --git a/src/core/dbus.h b/src/core/dbus.h
index 4f06ad1..ff76166 100644
--- a/src/core/dbus.h
+++ b/src/core/dbus.h
@@ -34,6 +34,8 @@ void bus_track_serialize(sd_bus_track *t, FILE *f);
int bus_track_deserialize_item(char ***l, const char *line);
int bus_track_coldplug(Manager *m, sd_bus_track **t, char ***l);
+int manager_sync_bus_names(Manager *m, sd_bus *bus);
+
int bus_foreach_bus(Manager *m, sd_bus_track *subscribed2, int (*send_message)(sd_bus *bus, void *userdata), void *userdata);
int bus_verify_manage_units_async(Manager *m, sd_bus_message *call, sd_bus_error *error);
diff --git a/src/core/manager.c b/src/core/manager.c
index e65616a..ffe27be 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -2574,6 +2574,10 @@ int manager_reload(Manager *m) {
/* Third, fire things up! */
manager_coldplug(m);
+ /* Sync current state of bus names with our set of listening units */
+ if (m->api_bus)
+ manager_sync_bus_names(m, m->api_bus);
+
assert(m->n_reloading > 0);
m->n_reloading--;
--
2.6.2

9
systemd-mini.changes
View File

@ -1,3 +1,12 @@
-------------------------------------------------------------------
Sat Mar 26 15:59:36 UTC 2016 - jengelh@inai.de
- Add two patches which address logind/networkd disappearing from
dbus (and busctl) even while the units and processes continue
running.
0001-core-fix-bus-name-synchronization-after-daemon-reloa.patch
0001-core-re-sync-bus-name-list-after-deserializing-durin.patch
-------------------------------------------------------------------
Mon Mar 14 18:04:10 UTC 2016 - fbui@suse.com

6
systemd-mini.spec
View File

@ -255,6 +255,10 @@ Patch524: 0001-nss-mymachines-do-not-allow-overlong-machine-names.patch
Patch525: 0001-core-exclude-.slice-units-from-systemctl-isolate.patch
# PATCH-FIX-UPSTREAM -- fixed after 228
Patch526: systemd-228-nspawn-make-journal-linking-non-fatal-in-try-and-auto.diff
# PATCH-FIX-UPSTREAM -- fixed after 228
Patch527: 0001-core-fix-bus-name-synchronization-after-daemon-reloa.patch
# PATCH-FIX-UPSTREAM -- fixed after 228
Patch528: 0001-core-re-sync-bus-name-list-after-deserializing-durin.patch
# UDEV PATCHES
# ============
@ -597,6 +601,8 @@ cp %{SOURCE7} m4/
%patch524 -p1
%patch525 -p1
%patch526 -p1
%patch527 -p1
%patch528 -p1
# udev patches
%patch1002 -p1

9
systemd.changes
View File

@ -1,3 +1,12 @@
-------------------------------------------------------------------
Sat Mar 26 15:59:36 UTC 2016 - jengelh@inai.de
- Add two patches which address logind/networkd disappearing from
dbus (and busctl) even while the units and processes continue
running.
0001-core-fix-bus-name-synchronization-after-daemon-reloa.patch
0001-core-re-sync-bus-name-list-after-deserializing-durin.patch
-------------------------------------------------------------------
Mon Mar 14 18:04:10 UTC 2016 - fbui@suse.com

6
systemd.spec
View File

@ -250,6 +250,10 @@ Patch524: 0001-nss-mymachines-do-not-allow-overlong-machine-names.patch
Patch525: 0001-core-exclude-.slice-units-from-systemctl-isolate.patch
# PATCH-FIX-UPSTREAM -- fixed after 228
Patch526: systemd-228-nspawn-make-journal-linking-non-fatal-in-try-and-auto.diff
# PATCH-FIX-UPSTREAM -- fixed after 228
Patch527: 0001-core-fix-bus-name-synchronization-after-daemon-reloa.patch
# PATCH-FIX-UPSTREAM -- fixed after 228
Patch528: 0001-core-re-sync-bus-name-list-after-deserializing-durin.patch
# UDEV PATCHES
# ============
@ -592,6 +596,8 @@ cp %{SOURCE7} m4/
%patch524 -p1
%patch525 -p1
%patch526 -p1
%patch527 -p1
%patch528 -p1
# udev patches
%patch1002 -p1