Over the past 2 years Flathub has evolved from a wild idea at a hackfest to a community of app developers and publishers making over 600 apps available to end-users on dozens of Linux-based OSes. We couldn’t have gotten anything off the ground without the support of the 20 or so generous souls who backed our initial fundraising, and to make the service a reality since then we’ve relied on on the contributions of dozens of individuals and organisations such as Codethink, Endless, GNOME, KDE and Red Hat. But for our day to day operations, we depend on the continuous support and generosity of a few companies who provide the services and resources that Flathub uses 24/7 to build and deliver all of these apps. This post is about saying thank you to those companies!

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youtube免费代理 is a UK-based “no-nonsense” hosting provider who provide managed and un-managed co-location, dedicated servers, VPS and shared hosting. They are also conveniently based in Cambridge where I live, and very nice people to have a coffee or beer with, particularly if you enjoy talking about IPv6 and how many web services you can run on a rack full of Raspberry Pis. The “heart” of Flathub is a physical machine donated by them which originally ran everything in separate VMs – buildbot, frontend, repo master – and they have subsequently increased their donation with several VMs hosted elsewhere within their network. We also benefit from huge amounts of free bandwidth, backup/storage, monitoring, management and their expertise and advice at scaling up the service.

Starting with everything running on one box in 2017 we quickly ran into scaling bottlenecks as traffic started to pick up. With Mythic’s advice and a healthy donation of 100s of GB / month more of bandwidth, we set up two caching frontend servers running in virtual machines in two different London data centres to cache the commonly-accessed objects, shift the load away from the master server, and take advantage of the physical redundancy offered by the Mythic network.

As load increased and we brought a CDN online to bring the content closer to the user, we also moved the Buildbot (and it’s associated Postgres database) to a VM hosted at Mythic in order to offload as much IO bandwidth from the repo server, to keep up sustained HTTP throughput during update operations. This helped significantly but we are in discussions with them about a yet larger box with a mixture of disks and SSDs to handle the concurrent read and write load that we need.

Even after all of these changes, we keep the repo master on one, big, physical machine with directly attached storage because repo update and delta computations are hugely IO intensive operations, and our OSTree repos contain over 9 million inodes which get accessed randomly during this process. We also have a physical HSM (a YubiKey) which stores the GPG repo signing key for Flathub, and it’s really hard to plug a USB key into a cloud instance, and know where it is and that it’s physically secure.

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Thanks to an introduction by the most excellent Jorge Castro and the approval and support of the Linux Foundation’s CNCF Infrastructure Lab, we were able to get access to an “all expenses paid” account at Packet. Packet is a “bare metal” cloud provider — like AWS except you get entire boxes and dedicated switch ports etc to yourself – at a handful of main datacenters around the world with a full range of server, storage and networking equipment, and a larger number of edge facilities for distribution/processing closer to the users. They have an API and a magical provisioning system which means that at the click of a button or one method call you can bring up all manner of machines, configure networking and storage, etc. Packet is clearly a service built by engineers for engineers – they are smart, easy to get hold of on e-mail and chat, share their roadmap publicly and set priorities based on user feedback.

We currently have 4 Huge Boxes (2 Intel, 2 ARM) from Packet which do the majority of the heavy lifting when it comes to building everything that is uploaded, and also use a few other machines there for auxiliary tasks such as caching source downloads and receiving our streamed logs from the CDN. We also used their flexibility to temporarily set up a whole separate test infrastructure (a repo, buildbot, worker and frontend on one box) while we were prototyping recent changes to the Buildbot.

A special thanks to Ed Vielmetti at Packet who has patiently supported our requests for lots of 32-bit compatible ARM machines, and for his support of other Linux desktop projects such as GNOME and the Freedesktop SDK who also benefit hugely from Packet’s resources for build and CI.

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Even with two redundant / load-balancing front end servers and huge amounts of bandwidth, OSTree repos have so many files that if those servers are too far away from the end users, the latency and round trips cause a serious problem with throughput. In the end you can’t distribute something like Flathub from a single physical location – you need to get closer to the users. Fortunately the OSTree repo format is very efficient to distribute via a CDN, as almost all files in the repository are immutable.

After a very speedy response to a plea for help on Twitter, Fastly – one of the world’s leading CDNs – generously agreed to donate free use of their CDN service to support Flathub. All traffic to the dl.flathub.org domain is served through the CDN, and automatically gets cached at dozens of points of presence around the world. Their service is frankly really really cool – the configuration and stats are reallly powerful, unlike any other CDN service I’ve used. Our configuration allows us to collect custom logs which we use to generate our Flathub stats, and to define edge logic in Varnish’s VCL which we use to allow larger files to stream to the end user while they are still being downloaded by the edge node, improving throughput. We also use their API to purge the summary file from their caches worldwide each time the repository updates, so that it can stay cached for longer between updates.

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To buy the scale of services and support that Flathub receives from our commercial sponsors would cost tens if not hundreds of thousands of dollars a month. Flathub could not exist without Mythic Beasts, Packet and Fastly‘s support of the free and open source Linux desktop. Thank you!

This week, the GNOME Foundation Board of Directors met at the Collabora office in Cambridge, UK, for the second annual Foundation Hackfest. We were also joined by the Executive Director, Neil McGovern, and Director of Operations, Rosanna Yuen. This event was started by last year’s board and is a great opportunity for the newly-elected board to set out goals for the coming year and get some uninterrupted hacking done on policies, documents, etc. While it’s fresh in our mind, we wanted to tell you about some of the things we have been working on this week and what the community can hope to see in the coming months.

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On Wednesday we set out to define the overall goals of the Foundation, so we could focus our activities for the coming years, ensuring that we were working on the right priorities. Neil helped to facilitate the discussion using the Charting Impact process. With that input, we went back to the purpose of the Foundation and mapped that to ten and five year goals, making sure that our current strategies and activities would be consistent with reaching those end points. This is turning out to be a very detailed and time-consuming process. We have made a great start, and hope to have something we can share for comments and input soon. The high level 10-year goals we identified boiled down to:

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• Increased user base

As we looked at the charter and bylaws, we identified a long-standing issue which we need to solve — there is currently no formal process to cover the “scope” of the Foundation in terms of which software we support with our resources. There is the release team, but that is only a subset of the software we support. We have some examples such as GIMP which “have always been here”, but at present there is no clear process to apply or be included in the Foundation. We need a clear list of projects that use resources such as CI, or have the right to use the GNOME trademark for the project. We have a couple of similar proposals from Allan Day and Carlos Soriano for how we could define and approve projects, and we are planning to work with them over the next couple of weeks to make one proposal for the board to review.

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We started the second day with a review of the proposed forecast from Neil and Rosanna, because the Foundation’s financial year starts in October. We have policies in place to allow staff and committees to spend money against their budget without further approval being needed, which means that with no approved budget, it’s very hard for the Foundation to spend any money. The proposed budget was based off the previous year’s actual figures, with changes to reflect the increased staff headcount, increased spend on CI, increased staff travel costs, etc, and ensure after the year’s spending, we follow the reserves policy to keep enough cash to pay the foundation staff for a further year. We’re planning to go back and adjust a few things (internships, marketing, travel, etc) to make sure that we have the right resources for the goals we identified.

We had some “hacking time” in smaller groups to re-visit and clarify various policies, such as the conference and hackfest proposal/approval process, travel sponsorship process and look at ways to support internationalization (particularly to indigenous languages).

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The Board started Friday with a board-only (no staff) meeting to make sure we were aligned on the goals that we were setting for the Executive Director during the coming year, informed by the Foundation goals we worked on earlier in the week. To avoid the “seven bosses” problem, there is one board member (myself) responsible for managing the ED’s priorities and performance. It’s important that I take advantage of the opportunity of the face to face meeting to check in with the Board about their feedback for the ED and things I should work together with Neil on over the coming months.

We also discussed a related topic, which is the length of the term that directors serve on the Foundation Board. With 7 staff members, the Foundation needs consistent goals and management from one year to the next, and the time demands on board members should be reduced from previous periods where the Foundation hasn’t had an Executive Director. We want to make sure that our “ten year goals” don’t change every year and undermine the strategies that we put in place and spend the Foundation resources on. We’re planning to change the Board election process so that each director has a two year term, so half of the board will be re-elected each year. This also prevents the situation where the majority of the Board is changed at the same election, losing continuity and institutional knowledge, and taking months for people to get back up to speed.

We finished the day with a formal board meeting to approve the budget, more hack time on various policies (and this blog!). Thanks to Collabora for use of their office space, food, and snacks – and thanks to my fellow Board members and the Foundation’s wonderful and growing staff team

Last week the Flatpak community woke to the “news” that we are making the world a less secure place and we need to rethink what we’re doing. Personally, I’m not sure this is a fair assessment of the situation. The “tl;dr” summary is: Flatpak confers many benefits besides the sandboxing, and even looking just at the sandboxing, improving app security is a huge problem space and so is a work in progress across multiple upstream projects. Much of what has been achieved so far already delivers incremental improvements in security, and we’re making solid progress on the wider app distribution and portability problem space.

Sandboxing, like security in general, isn’t a binary thing – you can’t just say because you have a sandbox, you have 100% security. Like having two locks on your front door, two front doors, or locks on your windows too, sensible security is about defense in depth. Each barrier that you implement precludes some invalid or possibly malicious behaviour. You hope that in total, all of these barriers would prevent anything bad, but you can never really guarantee this – it’s about multiplying together probabilities to get a smaller number. A computer which is switched off, in a locked faraday cage, with no connectivity, is perfectly secure – but it’s also perfectly useless because you cannot actually use it. Sandboxing is very much the same – whilst you could easily take systemd-nspawn, Docker or any other container technology of choice and 100% lock down a desktop app, you wouldn’t be able to interact with it at all.

Network services have incubated and driven most of the container usage on Linux up until now but they are fundamentally different to desktop applications. For services you can write a simple list of permissions like, “listen on this network port” and “save files over here” whereas desktop applications have a much larger number of touchpoints to the outside world which the user expects and requires for normal functionality. Just thinking off the top of my head you need to consider access to the filesystem, display server, input devices, notifications, IPC, accessibility, fonts, themes, configuration, audio playback and capture, video playback, screen sharing, GPU hardware, printing, app launching, removable media, and joysticks. Without making holes in the sandbox to allow access to these in to your app, it either wouldn’t work at all, or it wouldn’t work in the way that people have come to expect.

What Flatpak brings to this is understanding of the specific desktop app problem space – most of what I listed above is to a greater or lesser extent understood by Flatpak, or support is planned. The Flatpak sandbox is very configurable, allowing the application author to specify which of these resources they need access to. The Flatpak CLI asks the user about these during installation, and we provide the flatpak override command to allow the user to add or remove these sandbox escapes. Flatpak has introduced portals into the Linux desktop ecosystem, which we’re really pleased to be sharing with snap since earlier this year, to provide runtime access to resources outside the sandbox based on policy and user consent. For instance, document access, app launching, input methods and recursive sandboxing (“sandbox me harder”) have portals.

The starting security position on the desktop was quite terrible – anything in your session had basically complete access to everything belonging to your user, and many places to hide.

• Access to the X socket allows arbitrary input and output to any other app on your desktop, but without it, no app on an X desktop would work. Wayland fixes this, so Flatpak has a fallback setting to allow Wayland to be used if present, and the X socket to be shared if not.
• Unrestricted access to the PulseAudio socket allows you to reconfigure audio routing, capture microphone input, etc. To ensure user consent we need a portal to control this, where by default you can play audio back but device access needs consent and work is under way to create this portal.
• Access to the webcam device node means an app can capture video whenever it wants – solving this required a whole new project.
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Looking at the specific concerns raised:

• Hopefully from the above it’s clear that sandboxing desktop apps isn’t just a switch we can flick overnight, but what we already have is far better than having nothing at all. It’s not the intention of Flatpak to somehow mislead people that sandboxed means somehow impervious to all known security issues and can access nothing whatsoever, but we do want to encourage the use of the new technology so that we can work together on driving adoption and making improvements together. The idea is that over time, as the portals are filled out to cover the majority of the interfaces described, and supported in the major widget sets / frameworks, the criteria for earning a nice “sandboxed” badge or submitting your app to Flathub will become stricter. Many of the apps that access --filesystem=home are because they use old widget sets like Gtk2+ and frameworks like Electron that don’t support portals (yet!). Contributions to improve portal integration into other frameworks and desktops are very welcome and as mentioned above will also improve integration and security in other systems that use portals, such as snap.
• As Alex has 免费上youtube加速软件, the freedesktop.org 1.6 runtime was something we threw together because we needed something distro agnostic to actually be able to bootstrap the entire concept of Flatpak and runtimes. A confusing mishmash of Yocto with flatpak-builder, it’s thankfully nearing some form of retirement after a recent round of security fixes. The replacement freedesktop-sdk project has just released its first stable 18.08 release, and rather than “one or two people in their spare time because something like this needs to exist”, is backed by a team from Codethink and with support from the Flatpak, GNOME and KDE communities.
• I’m not sure how fixing and disclosing a security problem in a relatively immature pre-1.0 program (in June 2017, Flathub had less than 50 apps) is considered an ongoing problem from a security perspective. The wording in the release notes?

Zooming out a little bit, I think it’s worth also highlighting some of the other reasons why Flatpak exists at all – these are far bigger problems with the Linux desktop ecosystem than app security alone, and Flatpak brings a huge array of benefits to the table:

• Allowing apps to become agnostic of their underlying distribution. The reason that runtimes exist at all is so that apps can specify the ABI and dependencies that they need, and you can run it on whatever distro you want. Flatpak has had this from day one, and it’s been hugely reliable because the sandboxed /usr means the app can rely on getting whatever they need. This is the foundation on which everything else is built.
• Separating the release/update cadence of distributions from the apps. The flip side of this, which I think is huge for more conservative platforms like Debian or enterprise distributions which don’t want to break their ABIs, hardware support or other guarantees, is that you can still get new apps into users hands. Wider than this, I think it allows us huge new freedoms to move in a direction of reinventing the distro – once you start to pull the gnarly complexity of apps and their dependencies into sandboxes, your constraints are hugely reduced and you can slim down or radically rethink the host system underneath. At Endless OS, Flatpak literally changed the structure of our engineering team, and for the first time allowed us to develop and deliver our OS, SDK and apps in independent teams each with their own cadence.
• Disintermediating app developers from their users. Flathub now offers over 400 apps, and (at a rough count by Nick Richards over the summer) over half of them are directly maintained by or maintained in conjunction with the upstream developers. This is fantastic – we get the releases when they come out, the developers can choose the dependencies and configuration they need – and they get to deliver this same experience to everyone.
• Decentralised. Anyone can set up a Flatpak repo! We started our own at Flathub because there needs to be a center of gravity and a complete story to build out a user and developer base, but the idea is that anyone can use the same tools that we do, and publish whatever/wherever they want. GNOME uses GitLab CI to publish nightly Flatpak builds, KDE is setting up the same in their infrastructure, and Fedora is working on completely different infrastructure to build and deliver their packaged applications as Flatpaks.
• 免费上youtube加速软件. I’ve worked on Debian packages, RPMs, Yocto, etc and I can honestly say that flatpak-builder has done a very good job of making it really easy to put your app manifest together. Because the builds are sandboxed and each runtimes brings with it a consistent SDK environment, they are very reliably reproducible. It’s worth just calling this out because when you’re trying to attract developers to your platform or contributors to your app, hurdles like complex or fragile tools and build processes to learn and debug all add resistance and drag, and discourage contributions. GNOME Builder can take any flatpak’d app and build it for you automatically, ready to hack within minutes.
• Different ways to distribute apps. Using OSTree under the hood, Flatpak supports single-file app .bundles, pulling from OSTree repos and OCI registries, and at Endless we’ve been working on peer-to-peer distribution like USB sticks and LAN sharing.

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At the Gtk+ hackfest in London earlier this year, we stole an afternoon from the toolkit folks (sorry!) to talk about Flatpak, and how we could establish a “critical mass” behind the Flatpak format. Bringing Linux container and sandboxing technology together with ostree, we’ve got a technology that solves real world distribution, technical and security problems that have arguably held back the Linux desktop space and frustrated ISVs and app developers for nearly 20 years. The problem we need to solve, like any ecosystem, is one of users and developers – without stuff you can easily get in Flatpak format, there won’t be many users, and without many users, we won’t have a strong or compelling incentive for developers to take their precious time to understand a new format and a new technology.

As Alex Larsson said in his GUADEC talk yesterday: Decentralisation is good. Flatpak is a tool that is totally agnostic of who is publishing the software and where it comes from. For software freedom, that’s an important thing because we want technology to empower users, rather than tell them what they can or can’t do. Unfortunately, decentralisation makes for a terrible user experience. At present, the Flatpak webpage has a manually curated list of links to 10s of places where you can find different Flatpaks and add them to your system. You can’t easily search and browse to find apps to try out – so it’s clear that if the current situation remains we’re not going to be able to get a critical mass of users and developers around Flatpak.

Enter Flathub. The idea is that by creating an obvious “center of gravity” for the Flatpak community to contribute and build their apps, users will have one place to go and find the best that the Linux app ecosystem has to offer. We can take care of the boring stuff like running a build service and empower Linux application developers to choose how and when their app gets out to their users. After the London hackfest we sketched out a minimum viable system – youtube免费代理, 手机如何看youtube and a few workers – and got it going over the past few months, culminating in a mini-fundraiser to pay for the hosting of a production-ready setup. Thanks to the 20 individuals who supported our fundraiser, to Mythic Beasts who provided a server along with management, monitoring and heaps of bandwidth, and to Codethink and Scaleway who provide our ARM and Intel workers respectively.

We inherit our core principles from the Flatpak project – we want the Flatpak technology to succeed at alleviating the issues faced by app developers in targeting a diverse set of Linux platforms. None of this stops you from building and hosting your own Flatpak repos and we look forward to this being a wide and open playing field. We care about the success of the Linux desktop as a platform, so we are open to proprietary applications through Flatpak’s “extra data” feature where the client machine downloads 3rd party binaries. They are correctly labeled as such in the AppStream, so will only be shown if you or your OS has configured GNOME Software to show you apps with proprietary licenses, respecting the user’s preference.

The new infrastructure is up and running and I put it into production on Thursday. We rebuilt the whole repository on the new system over the course of the week, signing everything with our new 4096-bit key stored on a Yubikey smartcard USB key. We have 66 apps at the moment, although Alex is working on bringing in the GNOME apps at present – we hope those will be joined soon by the KDE apps, and Endless is planning to move over as many of our 3rd party Flatpaks as possible over the coming months.

So, thanks again to Alex and the whole Flatpak community, and the individuals and the companies who supported making this a reality. You can add the repository and get downloading right away. Welcome to Flathub! Go forth and flatten… 🙂

Like all good blog posts, this one starts with an apology about not blogging for ages – in my case it looks like it’s been about 7 years which is definitely a new personal best (perhaps the equally or more remarkable thing is that I have diligently kept WordPress running in the meantime). In that time, as you might expect, a few things have happened, like I met a wonderful woman and fell in love and we have two wonderful children. I also decided to part ways with my “first baby” and leave my role as CTO & co-founder of Collabora. This was obviously a very tough decision – it’s a fantastic team where I met and made many life-long friends, and they are still going strong and doing awesome things with Open Source. However, shortly after that, in February last year, I was lucky enough to land what is basically a dream job working at Endless Computers as the VP of Deployment.

As I’m sure most readers know, Endless is building an OS to bring personal computing to millions of new users across the world. It’s based on Free Software like GNOME, Debian, ostree and Flatpak, and the more successful Endless is, the more people who get access to education, technology and opportunity – and the more FOSS users and developers there will be in the world. But in my role, I get to help define the product, understand our users and how technology might help them, take Open Source out to new people, solve commercial problems to get Endless OS out into the world, manage a fantastic team and work with bright people, learn from great managers and mentors, and still find time to squash bugs, review and write more code than I used to. Like any startup, we have a lot to do and not enough time to do it, so although there aren’t quite enough days in the week, I’m really happy!

In any case, the main point of this blog post is that I’m at GUADEC in Manchester right now, and I’d like to blog about 免费上youtube加速软件, but I thought it would be weird to just show up and say that after 7 years of silence without saying hello again. 🙂

As you all know by now, exciting moves from Google on the WebM project have lead to them open-sourcing On2’s VP8 codec to provide a freely available video codec for HTML5 content. Collabora Multimedia worked with Entropy Wave to add support to GStreamer for the new codec from day 1, and I was really happy yesterday to update my Debian system and get the support installed locally too. Thanks to our and Igalia’s fine work on GStreamer HTML5 support in WebKitGTK+, Gustavo Noronha found it worked out of the box with Epiphany too.

Predictably, the MPEG-LA aren’t too pleased with this, and are no doubt winding up their PR and industry allies at the moment, as well as this opening a new front on the Apple vs Google ongoing platform battle. But if your business model is collecting money through what is essentially a protection racket and spreading FUD about patent litigation, the VP8 license implicitly creating a zero-cost zero-revenue patent pool is not going to be good news for you (from the department of Google deleting your business model). The question is now whether the allure of Google’s content will win over against the legal chest pounding of the patent trolls, and whether they start flipping switches to make YouTube only serve up WebM content after a while.

Also in amazing and incredible news, Collabora’s Telepathy/GStreamer/GNOME/Debian/general R&D guru and staunch Web 2.0 holdout Sjoerd Simons has actually now got a blog after a mere 3 years of us suggesting it to him since he joined Collabora as an intern. He’s been hacking on some RTP payloader elements for VP8 so we can use it for video calling on the free desktop. All very exciting stuff, especially in conjunction with Muji (multi-user video calls over XMPP) support heading into Telepathy thanks to NLNet‘s ongoing support.

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I spent this weekend in Boston for the annual GNOME summit. I really enjoyed it this year, although there were fewer attendees than previously it felt very focussed and productive. There’s some cool stuff going on, and it’s always great to catch up with all of the usual free software suspects in Boston. Some highlights from the weekend:

• Corridor session with David Zeuthen, Ryan Lortie, Matthias Clasen and later joined by me and Will Thompson from Collabora, discussed a lot of the issues of integrating D-Bus into Glib and I think achieved a pretty good consensus about how GVariant and GDBus should fit together and start getting the pieces merged. Really looking forwards to it, GVariant looks mad ninja.
• Some nice discussions about Gtk+ 3.0 roadmap, although I’m still worried that the sealing/accessor work will take so much developer time there won’t be that much time to make the improvements its supposed to enable. Theming was mentioned but what else should there be? Also spotted Kristian Høgsberg, Cody Russell and Matthias again talking about client-side decorations, presumably Wayland scheming… 🙂
• Nice session about messaging and other notifications in GNOME Shell. I really like the way the project is going, and hopefully we can join in and spend some time hooking Telepathy up here, although as a fallback to make the existing stuff (which doesn’t have specific code to hook in and make a UI), then it’d be nice if the shell could also be a frontend for the notify/indicate stuff which Ubuntu have been pushing in GNOME 2.x already.
• Had some good brainstorming about 手机如何看youtube in games and Tomboy sharing too, as well as some slightly less conclusive pondering about how to deliver metacontacts (ie, merging multiple sources such as IM, social networking and other address books) in GNOME. We need to sync up with what Moblin is doing here as it looks quite promising and should give us some components to re-use.
• Will, Sjoerd and I spent an hour or two around a blackboard working out how XMPP end-to-end TLS encryption might be exposed to clients in Telepathy, in order to work out how best we’d expose OTR too. It looks like we have a fairly workable proposal now which we’ll be explaining in due course, but it means at least we can give more useful advice to people who are interested in implementing it, or move forwards on implementing it ourselves.

I was really impressed by Jason Clinton and others’ summaries of the sessions, which I think are really valuable for the people who couldn’t make it to the summit. He asked me to take some notes about the first Telepathy session on Saturday evening while he was taking notes about the Outreach session. Rather than lumber him with my deranged scratchings from Tomboy, I’ll blog them separately.

If youtube免费代理 has seemed quiet recently, it’s because we’ve been slaving away on various parts of a really awesome project, which we can finally start talking about. Maemo 5 is coming! o o/ /o/

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Aside from that, we’re planning to hack on Empathy for basically the whole day, looking at MC5 porting and UI polish, so there will be a big load of Collabora folks and friends somewhere. Will update when I know where.