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Packaging Example
Updated 1,364 Days AgoPublic

Purpose of this document

This is meant to supplement the Packaging Tutorial.


We were having some trouble setting the default GTK theme only to discover that upstream had created a patch that could help us out. We only package stable released versions, so we couldn't just repackage it with the new master in git. Instead, we wanted to patch our released version with this change.

Get the upstream changes

So first we needed to pull down the upstream repository. Clicking on the repo got us to the main page.

At that point, we clicked the Clone or Download button and copied the clone link. Then we opened up a terminal and cloned the repo:

git clone

Now we needed to make a patch. So we ran git log, which opens in a pager, like less. You should be able to use this to search by typing / followed by some search terms, and then hitting ENTER. So we did a search for "Set the default GTK theme" and found it at commit 4c3ad403dc14dde4fe41e56cf3272ac11e30346f. To make our patch we remember that git has a shortcut for "previous commit." Using that knowledge we did the following, creating a reasonably-named patch, and putting it in $HOME to keep it out of the way of everything else:

git diff 4c3ad403dc14dde4fe41e56cf3272ac11e30346f 4c3ad403dc14dde4fe41e56cf3272ac11e30346f^ > ~/set-default-gtk-theme.patch

Apply the patch

So now we needed to get our repo. We could search for "lxqt-config" in the search box here and we will eventually find rLXQTCONFIGPACKAGING. Once there, we can clone our repo, by clicking on the Clone button. With that now we can go back to our terminal and clone the repo:

git clone ssh://

Then we checked out the development branch:

git checkout ubuntu/cosmic

Then we grabbed the source:

uscan --download-current-version
tar -x --strip-components=1 -f ../lxqt-config_0.13.0.orig.tar.xz

Seeing that we already had patches in debian/patches we proceeded to apply them:

quilt push -a

And then we imported our patch:

quilt import ~/set-default-gtk-theme.patch

After import, we performed a required quilt push. This is the step that actually applied the patch to the source. Sometimes these don't apply cleanly and some editing is required, but in this case, we had no problems.

Just for safety's safe, we did a quilt refresh and then used quilt header --dep3 -e to edit the header:

Description: Set default GTK theme if rc file doesn't exists.
Author: P.L. Lucas <>

Finish it up

We added a new changelog entry with dch -i, incrementing the version number:

lxqt-config (0.13.0-0ubuntu5) cosmic; urgency=medium

  * Set default GTK theme if rc file doesn't exists. 

 -- Hans P. Möller <>  Thu, 04 Oct 2018 14:44:03 -0300

Then we built it to ensure there were no issues:

sudo apt update && sudo apt build-dep lxqt-config
debuild -b --no-sign

Next, we got rid of the source and remnants of quilt so the repo was back into a normal state.

rm -rf !(debian) .pc/

And finally, we put it up for review:

git add -A
arc diff

We gave it the commit message:

Set default GTK theme if rc file doesn't exists.

And filled out the template for the differential revision review:

Summary: Set default GTK theme if rc file doesn't exists.

Test Plan: See if default GTK theme is according to 'gsettings get org.gnome.desktop.interface gtk-theme'

Reviewers: @tsimonq2, @wxl


And that gave us the URL of the differential revision:

And that point, it was reviewed and changes were requested. We made those changes, using git add and git rm on files where appropriate, and then arc diffing again.

Finally, our revision was accepted and finally landed into our repositories, which in turn synced with the Ubuntu repos.

NOTE: due to the fact that our original Phabricator instance from which this came from died, the differential revision URL is no longer valid.
Last Author
Last Edited
Sep 15 2019, 11:45 AM

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wxl edited the content of this document. (Show Details)
wxl edited the content of this document. (Show Details)
wxl added subscribers: wxl, tsimonq2.

@wxl When runing debuild, it could be usefull to add -tc flag so "postclean" is run since there are a lot of files created in debian folder that won't be deleted with "rm -rf !(debian) .pc/"