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From f7feb791d476d2248c3f8df089092996262e9a23 Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Tue, 5 Nov 2013 22:17:03 +0100
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Subject: [PATCH] shutdown: trim the cgroup tree on loop iteration
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This way we leave the cgroup empty before exiting in a container which
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makes sure the container manager will get cgroup notification event
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https://bugs.freedesktop.org/show_bug.cgi?id=68370
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https://bugzilla.redhat.com/show_bug.cgi?id=988883
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---
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src/core/shutdown.c | 16 +++++++++++++---
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1 file changed, 13 insertions(+), 3 deletions(-)
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diff --git a/src/core/shutdown.c b/src/core/shutdown.c
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index 4709746..ea02b60 100644
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--- a/src/core/shutdown.c
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+++ b/src/core/shutdown.c
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@@ -46,6 +46,7 @@
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#include "virt.h"
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#include "watchdog.h"
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#include "killall.h"
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+#include "cgroup-util.h"
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#define FINALIZE_ATTEMPTS 50
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@@ -131,12 +132,12 @@ static int pivot_to_new_root(void) {
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}
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int main(int argc, char *argv[]) {
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- _cleanup_free_ char *line = NULL;
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- int cmd, r;
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- unsigned retries;
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bool need_umount = true, need_swapoff = true, need_loop_detach = true, need_dm_detach = true;
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bool in_container, use_watchdog = false;
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+ _cleanup_free_ char *line = NULL, *cgroup = NULL;
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char *arguments[3];
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+ unsigned retries;
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+ int cmd, r;
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/* suppress shutdown status output if 'quiet' is used */
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r = read_one_line_file("/proc/cmdline", &line);
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@@ -186,6 +187,8 @@ int main(int argc, char *argv[]) {
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goto error;
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}
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+ cg_get_root_path(&cgroup);
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+
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use_watchdog = !!getenv("WATCHDOG_USEC");
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/* lock us into memory */
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@@ -210,6 +213,13 @@ int main(int argc, char *argv[]) {
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if (use_watchdog)
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watchdog_ping();
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+ /* Let's trim the cgroup tree on each iteration so
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+ that we leave an empty cgroup tree around, so that
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+ container managers get a nice notify event when we
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+ are down */
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+ if (cgroup)
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+ cg_trim(SYSTEMD_CGROUP_CONTROLLER, cgroup, false);
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+
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if (need_umount) {
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log_info("Unmounting file systems.");
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r = umount_all(&changed);
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