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From 017d1bc2a34946336dbafcc1c9c390ea45a2a3bd Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Sat, 22 Oct 2016 22:16:02 -0400
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Subject: [PATCH] core: when restarting services, don't close fds
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We would close all the stored fds in service_release_resources(), which of
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course broke the whole concept of storing fds over service restart.
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Fixes #4408.
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(cherry picked from commit f0bfbfac43b7faa68ef1bb2ad659c191b9ec85d2)
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(cherry picked from commit 4c271437cd695c31e76adb191013009689a7797c)
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Resolves: #1803802
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---
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 src/core/service.c | 22 +++++++++++++++-------
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 src/core/unit.c    |  6 ++++--
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 src/core/unit.h    |  2 +-
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 3 files changed, 20 insertions(+), 10 deletions(-)
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diff --git a/src/core/service.c b/src/core/service.c
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index e538280bad..3c2f69a003 100644
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--- a/src/core/service.c
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+++ b/src/core/service.c
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@@ -258,7 +258,17 @@ static void service_fd_store_unlink(ServiceFDStore *fs) {
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         free(fs);
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 }
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-static void service_release_resources(Unit *u) {
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+static void service_release_fd_store(Service *s) {
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+        assert(s);
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+
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+        log_unit_debug(UNIT(s)->id, "Releasing all stored fds");
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+        while (s->fd_store)
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+                service_fd_store_unlink(s->fd_store);
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+
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+        assert(s->n_fd_store == 0);
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+}
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+
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+static void service_release_resources(Unit *u, bool inactive) {
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         Service *s = SERVICE(u);
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         assert(s);
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@@ -266,12 +276,10 @@ static void service_release_resources(Unit *u) {
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         if (!s->fd_store)
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                 return;
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-        log_debug("Releasing all resources for %s", u->id);
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-
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-        while (s->fd_store)
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-                service_fd_store_unlink(s->fd_store);
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+        log_unit_debug(u->id, "Releasing resources.");
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-        assert(s->n_fd_store == 0);
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+        if (inactive)
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+                service_release_fd_store(s);
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 }
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 static void service_done(Unit *u) {
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@@ -319,7 +327,7 @@ static void service_done(Unit *u) {
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         s->timer_event_source = sd_event_source_unref(s->timer_event_source);
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-        service_release_resources(u);
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+        service_release_resources(u, true);
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 }
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 static int on_fd_store_io(sd_event_source *e, int fd, uint32_t revents, void *userdata) {
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diff --git a/src/core/unit.c b/src/core/unit.c
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index 0dc66203a4..22e31a76b3 100644
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--- a/src/core/unit.c
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+++ b/src/core/unit.c
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@@ -285,6 +285,7 @@ int unit_set_description(Unit *u, const char *description) {
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 bool unit_may_gc(Unit *u) {
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         UnitActiveState state;
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+        bool inactive;
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         assert(u);
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         /* Checks whether the unit is ready to be unloaded for garbage collection.
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@@ -302,16 +303,17 @@ bool unit_may_gc(Unit *u) {
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                 return false;
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         state = unit_active_state(u);
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+        inactive = state == UNIT_INACTIVE;
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         /* If the unit is inactive and failed and no job is queued for
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          * it, then release its runtime resources */
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         if (UNIT_IS_INACTIVE_OR_FAILED(state) &&
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             UNIT_VTABLE(u)->release_resources)
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-                UNIT_VTABLE(u)->release_resources(u);
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+                UNIT_VTABLE(u)->release_resources(u, inactive);
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         /* But we keep the unit object around for longer when it is
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          * referenced or configured to not be gc'ed */
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-        if (state != UNIT_INACTIVE)
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+        if (!inactive)
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                 return false;
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         if (UNIT_VTABLE(u)->no_gc)
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diff --git a/src/core/unit.h b/src/core/unit.h
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index 719fc95260..232be8164f 100644
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--- a/src/core/unit.h
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+++ b/src/core/unit.h
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@@ -360,7 +360,7 @@ struct UnitVTable {
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         /* When the unit is not running and no job for it queued we
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          * shall release its runtime resources */
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-        void (*release_resources)(Unit *u);
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+        void (*release_resources)(Unit *u, bool inactive);
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         /* Return true when this unit is suitable for snapshotting */
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         bool (*check_snapshot)(Unit *u);