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ansible: jenkins: mount tracefs via fstab

Allow using bpftrace inside the jenkins lxc containers by making
/sys/kernel/tracing available through /etc/fstab.

Related: OS#6794
Change-Id: I568e3635fcc33040036fd19e9226b413db0d3ef3
---
M ansible/roles/osmocom-jenkins-slave/tasks/main.yml
1 file changed, 8 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-ci refs/changes/17/41717/1

diff --git a/ansible/roles/osmocom-jenkins-slave/tasks/main.yml b/ansible/roles/osmocom-jenkins-slave/tasks/main.yml
index 46da076..1ddbff9 100644
--- a/ansible/roles/osmocom-jenkins-slave/tasks/main.yml
+++ b/ansible/roles/osmocom-jenkins-slave/tasks/main.yml
@@ -78,3 +78,11 @@
     fstype: tmpfs
     state: mounted
     opts: "uid=1000,gid=1000"
+
+- name: add tracefs to /etc/fstab
+  ansible.posix.mount:
+    boot: true
+    path: /sys/kernel/tracing
+    src: tracefs
+    fstype: tracefs
+    state: present

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