From 6a5cecebc564efc9624bfb74e4ff089ca4c500e4 Mon Sep 17 00:00:00 2001
From: Jimmy Zelinskie <jimmy.zelinskie@coreos.com>
Date: Mon, 11 May 2015 19:05:00 -0400
Subject: [PATCH] buildman: create and mount btrfs volume for docker

There are numerous issues with overlayfs that actually aren't present with
btrfs. Btrfs seems to have long-running issues, but our builders are
ephemeral. Example issue: https://github.com/docker/docker/issues/10180
---
 buildman/templates/cloudconfig.yaml | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/buildman/templates/cloudconfig.yaml b/buildman/templates/cloudconfig.yaml
index 2f274361a..48334fc15 100644
--- a/buildman/templates/cloudconfig.yaml
+++ b/buildman/templates/cloudconfig.yaml
@@ -50,3 +50,25 @@ coreos:
                      after_units=['quay-builder.service']
                      ) | indent(4) }}
     {%- endif %}
+    - name: format-var-lib-docker.service
+      command: start
+      content: |
+        [Unit]
+        Before=docker.service var-lib-docker.mount
+        ConditionPathExists=!/var/lib/docker.btrfs
+        [Service]
+        Type=oneshot
+        ExecStart=/usr/bin/truncate --size=28G /var/lib/docker.btrfs
+        ExecStart=/usr/sbin/mkfs.btrfs /var/lib/docker.btrfs
+    - name: var-lib-docker.mount
+      command: start
+      content: |
+        [Unit]
+        Before=docker.service
+        After=format-var-lib-docker.service
+        Requires=format-var-lib-docker.service
+        [Mount]
+        What=/var/lib/docker.btrfs
+        Where=/var/lib/docker
+        Type=btrfs
+        Options=loop,discard