packaging: Update to document the new Arcanist approach

This change adds documentation for the initialisation of arcanist, and
gives brief tutorials on using git basics. Additionally it shows how
to send the patch via arc, and importantly, how to fix a patch that
has had changes requested.

Signed-off-by: Ikey Doherty <ikey@solus-project.com>

packaging/submitting-a-package/en.md

@@ -5,14 +5,107 @@ title = "Submitting the Package"
 
 This article will walk you through submitting a patch for a package for review and inclusion in the Solus repository.
 
-When sending patches to include your package in our repo, note that we do not accept binary files. We will need the `package.yml`, the `pspec_*.xml`, the `Makefile`, any ABI files generated, as well as the 
-`files/` directory if applicable included within the patch. These patches are required to be [git format patches](https://git-scm.com/docs/git-format-patch) and submitted to the Patch Submissions Tag, in 
-Maniphest, on our [Developer Portal](https://dev.solus-project.com).
+When contributing patches to Solus, please note that we do not accept the upload of binary files (i.e. `.eopkg`).
+All repository packages are built by a dedicated build server, from the source files provided in your patch upload.
 
-To generate a patch, first ensure your package directory is a git repo by running `git init`. Next, use `git add filename` to add files, where filename is, for example, the package.yml. Next, do `git commit` and 
-write an appropriate commit message, such as "Initial commit of packagename".
+At minimum, your patch will include changes for the following:
+
+ * `package.yml`
+ * `pspec_*.xml`
+
+If any additional files were required for the build, then you must also include the `files/` directory.
+If you are creating a new package, you will also need to include a `Makefile` containing the following text:
+
+```
+include ../Makefile.common
+```
+
+Lastly, many package builds may result in the generation of an ABI report. These files start with `abi_*` and must also
+be included, as they allow simple tracking of changes to symbols and dependencies.
+
+For all patch submissions you must be using the `arcanist` utility to communicate with the [Solus Developer Portal](https://dev.solus-project.com/)
+
+## Setting up Arcanist
+
+In three easy steps, you can set up arcanist for the first time:
+
+```
+sudo eopkg it arcanist
+arc set-config default https://dev.solus-project.com
+arc install-certificate
+```
+
+On the third step you will be given a unique link to log into the Developer Portal, to create a `Conduit API Token`. This
+token will be used to allow the CLI `arc` utility to communicate with Phabricator.
+
+
+## Creating the patch
+
+For every file you change or add, you must let git know about them:
+
+```
+git add someFile
+```
+
+For files that must be removed, you must do so using git:
+
+```
+git rm someFile
+```
+
+Likewise, for renaming a file, you must do so via git:
+
+```
+git mv someFile someFileName2
+```
+
+Once you're happy with your change, and you have verified locally that it works by having first built and
+installed it, it's time to commit your changes.
+
+```
+git commit
+```
+
+Make sure you provide a meaningful summary and a separate body to your commit message. For more information
+on suitable commit messages, please check the [tooling central documentation](https://github.com/solus-project/tooling-central/blob/master/README.rst#using-git).
+
+If you want to link this patch to an issue on the Developer portal, simply mention it in your commit message:
+
+```
+The inclusion of <somepackage> fixes T1234
+```
+
+
+If you need a change to depend on another change, mention it in the commit message too:
+
+```
+Depends on D5
+```
+
+Now you have your git commit, it's time to send it to us for review. Using the CLI again, simply issue:
+
+```
+arc diff
+```
+
+A new editor session will open, where you can provide optional details. Note that the default reviewer will
+be assigned after you submit, so it is not necessary to specify anyone here. Once you're finished, save and
+exit the editor (`CTRL+O` + `CTRL+X` for nano), and the patch will then be uploaded. You'll be presented
+with the Differential URL, and a review will happen as soon as possible.
+
+## Fixing a patch that needs changes
+
+That's easy. Don't make a new commit, just make any relevant changes to your local tree, adding + removing as
+before, but this time run:
+
+```
+git commit --amend
+```
+
+This will amend your original changes, and you can submit the patch once more with `arc diff`. The web UI will
+automatically update with the latest patch, without having to create any new tasks. Once accepted, your patch
+will be merged, and a build will be issued.
 
-Once a git commit is made, use `git format-patch -n1` to create a .patch file.
 
 ## Maintainership
 
@@ -26,4 +119,4 @@ over to a repository.
 
 Currently, the request mechanism [contact Ikey on IRC](/articles/contributing/getting-involved/en). It is far easier to grant access to active community members than those unknown to the project.
 
-Finally, note that the management reserve the right to revoke access at any time, in order to preserve project safety and integrity.
+Finally, note that the management reserve the right to revoke access at any time, in order to preserve project safety and integrity.