Re: [PATCH] tools: skip libvirt-guests fast if libvirtd is not active

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On 12/3/19 9:56 AM, Christian Ehrhardt wrote:
The most common operation of libvirt-guests is to manage the local
libvirtd. But users might have disabled that and while we are
After=libvirtd for ordering we are not Requiring it..
OTOH adding that or any harder dependency might affect our ordering.

But if people have disabled libvirt they will do a full retry loop
until timeout. Lets check if the local service is active at all and skip
fast if it is not.

Fixes: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1854653

Reported-by: Doug Smythies <dsmythies@xxxxxxxxx>
Signed-off-by: Christian Ehrhardt <christian.ehrhardt@xxxxxxxxxxxxx>
---
  tools/libvirt-guests.sh.in | 8 ++++++++
  1 file changed, 8 insertions(+)

diff --git a/tools/libvirt-guests.sh.in b/tools/libvirt-guests.sh.in
index 4bc6e866f0..5a9930ee2f 100644
--- a/tools/libvirt-guests.sh.in
+++ b/tools/libvirt-guests.sh.in
@@ -90,6 +90,14 @@ test_connect()
  {
      uri=$1
+ if [ "x$uri" = xdefault ]; then
+        # Default config is most common and for the local libvirtd
+        # Check if it is active before wasting time in connect loop
+        if ! systemctl -q is-active libvirtd; then

Systemd is still not the only init out there:

moe ~ # systemctl -q is-active libvirtd
-su: systemctl: command not found

However, this will make libvirt-guests unusable when using split daemons (which are not enabled yet). So I guess we need to check whether either libvirtd or any of the hypervisor daemons is running (we can't assume the default URI is qemu:///system). Also, it would be nice to print a message why we tested connection unusable. Something like:

  eval_gettext "Libvirtd is not running. Skipping."
  return 1

Michal

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