From 44caf44ce61fbadf0c52121e8eb7b716aa6206a5 Mon Sep 17 00:00:00 2001
From: Jose Diaz-Gonzalez <email@josediazgonzalez.com>
Date: Thu, 30 Sep 2021 01:47:04 -0400
Subject: [PATCH 1/2] fix: set the DOKKU_HOST_ROOT on docker container start

Without this change, cache doesn't work when running in a docker container.
---
 docker/etc/my_init.d/10_dokku_init | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/docker/etc/my_init.d/10_dokku_init b/docker/etc/my_init.d/10_dokku_init
index 7326c36ca..c0a1579f3 100755
--- a/docker/etc/my_init.d/10_dokku_init
+++ b/docker/etc/my_init.d/10_dokku_init
@@ -62,6 +62,12 @@ main() {
     echo "export DOCKER_BIN=/usr/local/bin/docker" >"/home/dokku/.dokkurc/DOCKER_BIN"
   fi
 
+  if [[ -n "$DOKKU_HOST_ROOT" ]]; then
+    touch /etc/default/dokku
+    echo "export DOKKU_HOST_ROOT=$DOKKU_HOST_ROOT" >> /etc/default/dokku
+    chown dokku:dokku /etc/default/dokku
+  fi
+
   NGINX_ROOT="/etc/nginx"
   if [[ -x /usr/bin/openresty ]]; then
     NGINX_ROOT="/usr/local/openresty/nginx/conf"

From 9a1a97d56f34a7c2bb3ef14f40e5adb2573dca0e Mon Sep 17 00:00:00 2001
From: Jose Diaz-Gonzalez <email@josediazgonzalez.com>
Date: Thu, 30 Sep 2021 01:48:52 -0400
Subject: [PATCH 2/2] docs: document DOKKU_HOST_ROOT

---
 docker/etc/my_init.d/10_dokku_init     | 2 +-
 docs/getting-started/install/docker.md | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/docker/etc/my_init.d/10_dokku_init b/docker/etc/my_init.d/10_dokku_init
index c0a1579f3..f495142d4 100755
--- a/docker/etc/my_init.d/10_dokku_init
+++ b/docker/etc/my_init.d/10_dokku_init
@@ -64,7 +64,7 @@ main() {
 
   if [[ -n "$DOKKU_HOST_ROOT" ]]; then
     touch /etc/default/dokku
-    echo "export DOKKU_HOST_ROOT=$DOKKU_HOST_ROOT" >> /etc/default/dokku
+    echo "export DOKKU_HOST_ROOT=$DOKKU_HOST_ROOT" >>/etc/default/dokku
     chown dokku:dokku /etc/default/dokku
   fi
 
diff --git a/docs/getting-started/install/docker.md b/docs/getting-started/install/docker.md
index 094c11a37..d1ee556ed 100644
--- a/docs/getting-started/install/docker.md
+++ b/docs/getting-started/install/docker.md
@@ -11,6 +11,7 @@ Next, run the image.
 ```shell
 docker container run \
   --env DOKKU_HOSTNAME=dokku.me \
+  --env DOKKU_HOST_ROOT=/var/lib/dokku/home/dokku \
   --name dokku \
   --publish 3022:22 \
   --publish 8080:80 \
@@ -28,7 +29,8 @@ Dokku is run in the following configuration:
 - Container HTTP port 80 is exposed on the host as 8080.
 - Container HTTPS port 443 is exposed on the host as 8443.
 - Data within the container is stored on the host within the `/var/lib/dokku` directory.
-- The docker socket is mounted into container
+- Image build cache is set to the data dir + `/home/dokku`.
+- The docker socket is mounted into container.
 
 Application repositories, plugin config, as well as plugin data are persisted to disk within the specified host directory for `/var/lib/dokku`.