Improves documentation

 * Describes better available source tree sharing method (between
xds-agent and xds-server), and which to prefer depending on the
deployment setup.
 * Gives indication about how to pass RSYNC_TARGET and RSYNC_PREFIX
 env vars to the helloworld-native-application build process.
 * Swap chapter order (build before config)

Bug: SPEC-1993

Change-Id: Ie4c22f277a59b0405744d71b0fadff67c5d5d025
Signed-off-by: Sebastien Douheret <sebastien.douheret@iot.bzh>

3 files changed, 26 insertions, 5 deletions

diff --git a/docs/part-1/4-1_build-first-app-setup.md b/docs/part-1/4-1_build-first-app-setup.md
index 1458e4e..7b8fff2 100644
--- a/docs/part-1/4-1_build-first-app-setup.md
+++ b/docs/part-1/4-1_build-first-app-setup.md
@@ -1,12 +1,23 @@
 # Setup
 
+## Sources Sharing Methods
+
+### What are possible ways to share source trees ?
+
 Let's use _helloworld-native-application_ project as example, so you need first to clone
 this project into a directory that will be accessible by `xds-server`.
 
-Depending of the project sharing method:
+There are two possible methods to share sources between your host and the XDS server:
+- Cloud sync: implies your local directory will be sent to and replicated on the server. This method lets you clone project anywhere on your local disk,
+- Path mapping: apply when the xds-server is running locally. This method uses a volume shared between your host and the server, typically `$HOME/xds-workspace` directory. It is much more efficient as there is no replication onto the server ; but you must clone project under the shared directory (`$HOME/xds-workspace` is a good choice because it is shared by default. To create more shared volumes, See --volume option of [container creation script](http://docs.automotivelinux.org/docs/devguides/en/dev/reference/xds/part-1/1-1_install-xds-server-docker.html#create-and-start-a-new-container) )
+
+### Which one should I choose ?
+
+It depends on your [deployment setup](http://docs.automotivelinux.org/docs/devguides/en/dev/reference/xds/part-1/0_Abstract.html) (Standalone, On-Premise or SaaS).
 
-- Cloud sync: you can clone project anywhere on your local disk,
-- Path mapping: you must clone project into `$HOME/xds-workspace` directory.
+* Standalone : use local path mapping. It makes no sense to use cloud sync as it would add pointless overhead.
+* On-Premise : use Clound Sync.
+* SaaS : use Cloud Sync. This is the only way to achieve source sharing in this deployment setup.
 
 <!-- section-note -->
 **Note:** : [helloworld-native-application](https://github.com/iotbzh/helloworld-native-application) project is an AGL
diff --git a/docs/part-1/4-2_build-first-app-cmd.md b/docs/part-1/4-2_build-first-app-cmd.md
index fbfdc41..c878d08 100644
--- a/docs/part-1/4-2_build-first-app-cmd.md
+++ b/docs/part-1/4-2_build-first-app-cmd.md
@@ -63,15 +63,19 @@ You are now ready to use XDS to for example cross build your project.
 Here is an example to build a project based on CMakefile:
 
 ```bash
+# First, grab your target IP address, or it's DNS name
+export TARGET_ADDRESS=<target_adress>
+
 # Go into your project directory and create a build directory
 cd $MY_PROJECT_DIR
 mkdir build
 
 # Generate build system using cmake
-xds-cli exec --id=4021617e --sdkid=c226821b -- "cd build && cmake .."
+# RSYNC_* variables must be set to allow deployment/populate widgets on target (see app-template doc for more info)
+xds-cli exec --id=4021617e --sdkid=c226821b -- "export RSYNC_TARGET=root@${TARGET_ADDRESS} ; export RSYNC_PREFIX=/opt ; cd build && cmake .."
 
 # Build the project
-xds-cli exec --id=4021617e --sdkid=c226821b -- "cd build && make all"
+xds-cli exec --id=4021617e --sdkid=c226821b -- "cd build && make widget"
 ```
 
 <!-- section-note -->
diff --git a/docs/part-1/4-3_build-first-app-dashboard.md b/docs/part-1/4-3_build-first-app-dashboard.md
index 1f43715..076be94 100644
--- a/docs/part-1/4-3_build-first-app-dashboard.md
+++ b/docs/part-1/4-3_build-first-app-dashboard.md
@@ -39,6 +39,12 @@ your local disk.
 
 ## Build from XDS dashboard
 
+<!-- section-note -->
+**Note:** _helloworld-native-application_ requires few configuration items to be able to walkthrough the whole process.
+To pass some environment variables, use the `Settings` window in the `Build` tab. The `Env variables` field allows to pass a list of environment variables (semi-colon separated) that will be set on the server prior to any build action.
+For the _helloworld-native-application_ you have to pass something like `RSYNC_TARGET=root@mytarget;RSYNC_PREFIX=/opt` (please replace `mytarget` by a valid target IP address or DNS name entry).
+<!-- end-section-note -->
+
 Open the build page build entry of left sidebar ![](./pictures/xds-dashboard-icon-3.png){:: style="display:inline; padding:0;"},
 
 then select your **Project** and the **Cross SDK** you want to use and click on