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ansible: docker: clean vfs storage leftovers

Docker is configured via ansible to use the overlay2 storage driver
since August 2020 (I20728d6017204c3978e23376baa89de6e91fed1e). Clean up
an unused vfs dir if it is present on the system, as it was the case on
build2-deb9build-ansible with a 190 GiB vfs dir.

Related: OS#5827
Change-Id: I58f3f4a26ad6fa4698d87475cefb6ab21e66b15a
---
M ansible/roles/docker/tasks/main.yml
1 file changed, 4 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-ci refs/changes/57/27157/1

diff --git a/ansible/roles/docker/tasks/main.yml b/ansible/roles/docker/tasks/main.yml
index 97df86a..7c7fe85 100644
--- a/ansible/roles/docker/tasks/main.yml
+++ b/ansible/roles/docker/tasks/main.yml
@@ -52,6 +52,10 @@
     dest: /etc/docker/daemon.json
   notify: restart docker
 
+# daemon.json configures overlay2 storage driver, clean up vfs leftovers
+- name: cleanup vfs storage dir
+  shell: "docker info | grep -q 'Storage Driver: overlay2' && rm -rf /var/lib/docker/vfs"
+
 # After docker is set up, add docuum to clean old docker images
 # x86_64 only, as the raspberries need to be upgraded before they can use recent docker images (OS#5453)
 - include: docuum.yml

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