These are unlikely to change any minds, but they will defintely shorten some incredibly tedious conversations at the bar.
Here's a PDF if you'd like some of your own.
Previously, previously, previously, previously, previously, previously, previously, previously, previously, previously, previously, previously, previously, previously, previously, previously.
I'm blatantly stealing this from Matt Holden who taught it to me, but I think about it all the time and I want a reference page to be able to point myself and others too.
When working on a team, there are three levels to work on:
Level 1: Agree on the problem to be solved
Level 2: Agree on the approach to solving the problem
Level 3: Agree on the details
Many disagreements happen when you skip these levels or give level 3 feedback when people are looking for level 1 recognition.
About two years ago, our head maintainer @ridiculousfish opened what quickly became our most-read pull request:
Truth be told, we did not quite expect that to be as popular as it was. It was written as a bit of an in-joke for the fish developers first, and not really as a press release to be shared far and wide. We didn’t post it anywhere, but other people did, and we got a lot of reactions.
Observant readers will note that the PR was a proposal to rewrite the entirety of fish in Rust, from C++.
Fish is no stranger to language changes - it was ported from pure C to C++ earlier in its life, but this was a much bigger project, porting to a much more different language that didn’t even exist when fish was started in 2007.
Now that we’ve released the beta of fish 4.0, containing 0% C++ and almost 100% pure Rust, let’s look back to see what we’ve learned, what went well, what could have gone better and what we can do now.
We’re writing this so others can learn from our experience, but it is our experience and not an exhaustive study. We hope that you’ll be able to follow along even if you have never written any rust, but experience with a roughly C++-shaped language should help.
We’ve experienced some pain with C++. In short:
Frankly, the tooling around the language isn’t good, and we had to take on some additional pain in order to support our users. We want to provide up-to-date fish packages for systems that aren’t up-to-date, like LTS Linux and older macOS. But there is no ‘rustup’ for C++, no standard way to install recent C++ compilers on these operating systems. This means adopting recent C++ standards would complicate the lives of packagers and would-be contributors1. For example, we started using C++11 in 2016, and yet we still needed to upgrade the compilers on our build machines until 2020.
Fish also uses threads for its award-winning (note to editor: find an actual award) autosuggestions and syntax highlighting, and one long-term project is to add concurrency to the language.
Here’s a dirty secret: while external commands run in parallel, fish’s execution of internal commands (builtins and functions) is currently serial and can’t be backgrounded. Lifting this limitation will enable features like asynchronous prompts or non-blocking completions, as well as performance gains.
POSIX shells use subshells to get around this, but subshells are a leaky abstraction that can bite you in the behind when you least expect it. For instance, you can’t set variables from inside a pipe (except on some shells, but only in the last part of the pipe, maybe, if you have enabled the correct option). We would like to avoid that, and so the heavy hand of forking off a process isn’t appealing.
We prototyped true multithreaded execution in C++, but it just didn’t work out. For example, it was too easy to accidentally share objects across threads, with only post-hoc tools like Thread Sanitizer to prevent it.
The ergonomics of C++ are also simply not good - header files are annoying, templates are complicated, you can easily cause a compile error that throws pages of overloads in the standard library at you. Many functions are unsafe to use. C++ string handling is very verbose with easily confusable overloads of many methods, making it attractive to drop down to C-style char pointers, which are quite unsafe.
And the standard prioritizes performance over ergonomics. Consider for instance string_view, which provides a non-owning slice of a string. This is an extremely modern, well-liked feature that C++ programmers often claim is a great reason to switch to C++17. And it is extremely easy to run into use-after-free bugs with it, because the ergonomics weren’t a priority.
One good case study of the deficiencies of C++-in-practice is a C library: curses. This is a venerable library to access terminal features, and we use it to access the terminfo database, which describes differences in terminal features and behavior.
This not only caused us grief by being unsafe to use in weird ways - the “cur_term” pointer (or sometimes macro!) can be NULL, and it is dereferenced in surprising places, but also caused a surprisingly high number of issues when building from source. This was either because there are multiple implementations of it with differences as useless as “this function takes a char on system X but an int on system Y”, but also because users kept coming to us with new and exciting(ly terrible) ways to package and install it. The dependency system is the system package manager.
Finally, subjectively, C++ isn’t drawing in the crowds. We have never had a lot of C++ contributors. Over the 11 years fish used C++, only 17 people have at least 10 commits to the C++ code. We also don’t know a lot of people who would love to work on a C++ codebase in their free time.
Some parting thoughts we can give the C++ community: We would like to see improvements to ergonomics and safety of the language and the tools prioritized over performance, and we would like to see efforts to make C++ compilers easier to upgrade on real systems.
We need to get one thing out of the way: Rust is cool. It’s fun.
It’s tempting to try to sweep this under the rug because it feels gauche to say, but it’s actually important for a number of reasons.
For one, fish is a hobby project, and that means we want it to be fun for us. Nobody is being paid to work on fish, so we need it to be fun. Being fun and interesting also attracts contributors.
Rust also has great tooling. The tools have really paid a lot of attention to use, and the compiler errors are terrific. Not even “compared to C++”, they just actually rule. And as we have tried to pay attention to our own error messages (fish has a bespoke error for if it thinks a file you told it to run has Windows line endings), we like it.
And it is easy to get that tooling installed - rustup is magic, and allows people to get started quickly, with minimal fuss or root permissions.
When the answer to “how to upgrade C++ compiler” is “find a repository (with root permissions), compile it yourself, install some other repository or a docker image”,
it is amazing how the Rust answer can just be “use rustup”.
Rust has great ergonomics - the difference between C++’s pointers (which can always be NULL) and Rust’s Options are apparent very quickly even to those of us who had never used it before. We did have a backport of C++’s optional, and liked using it, but it was never as integrated as Rust’s Options were.
Having an explicit use system where you know exactly which function comes from which module is a great improvement over #include.
Rust makes it nice to add dependencies. We don’t want to go overboard with it, but we do want to change our history format from our homegrown “I can’t believe it’s not YAML” to something specified that other tools can actually read, and Rust makes it easy to add support for YAML/JSON/KDL.
But the killer feature of Rust, from fish-shell’s perspective, is Send and Sync, statically enforcing rules around threading. “Fearless concurrency” is too strong - you can still blow your leg off with fork or signal handlers - but Send and Sync will be the key to unlocking fully multithreaded execution, with confidence in its correctness.
We did not do a comprehensive survey of other languages. We were confident Rust was up to the task and either already knew it or wanted to learn it, so we picked it.
A lot of hay has also been made online about Rust’s platform support (e.g. in the git project). We don’t see a big problem here - all of our big platforms (macOS, Linux, the BSDs) are supported, as are Opensolaris/Illumos and Haiku. We have never heard of anyone trying to run fish on NonStop.
Architecture support is even less of a problem - going by Debian’s popcon, 99.9995% (the actual result, not an exaggeration) of machines run an architecture that has Rust packages in Debian. Given that fish is installed on 1.92% of Debian systems, we would project two (2) or three (3) machines of the quarter million responses to have fish on an unsupported architecture 2.
Unlike what some online have assumed, a native Windows port was not a reason for switching to Rust as it was never in the cards. Fish is, at heart, a UNIX shell that relies not only on UNIX APIs but also their semantics, and exposes them in the scripting language. What would test -x say on Windows, which has no executable bit? These are issues that could be solved with a lot of work, but we’re unix nerds making a unix shell, not one for Windows.
The one platform we care about a bit that it does not currently seem to have enough support for is Cygwin, which is sad, but we have to make a cut somewhere.
We had decided we were gonna do a “Fish Of Theseus” port - we would move over, component by component, until no C++ was left. And at every stage of that process, it would remain a working fish.
This was a necessity - if we didn’t, we would not have a working program for months, which is not only demoralizing but would also have precluded us from using most of our test suite - which is end-to-end tests that run a script or fake a terminal interaction. We would also not have been able to do another C++ release, putting some cool improvements into the hands of our users.
Had we chosen to disappear into a hole we might not have finished at all, and we would have to re-do a bunch of work once it became testable. We also mostly kept the structure of the C++ code intact - if a function is in the “env” subsystem, it would stay there. Resisting the temptation to clean up allowed us to compare the before and after to find places where we had mistranslated something.
So we used autocxx to generate bindings between C++ and Rust code, allowing us to port one component at a time.
We started3 by porting the builtins. These are essentially little self-contained programs, with their own arguments, streams, exit code, etc. That means it’s easy to port them separately from the rest of the shell once you have a way to call a Rust builtin from C++, which we had as part of the initial pull request.
Where they connected to the main shell, we used one of three approaches:
For instance, almost every builtin needs to parse its options. We have our own implementation of getopt, that we reimplemented in Rust in the initial PR, but the C++ version stuck around until it had no more callers remaining. Otherwise we would have had to write a C++-to-Rust bridge and adjust the C++ callers to use it.
Or the builtin builtin (the builtin called builtin) needs access to the names of all builtins to print them for builtin --get-names. In that case we bridged some access to what amounts to a constant vector of strings in the C++, and eventually moved it over once the users were in Rust.
That’s how it went for a while, but we finally hit the more entangled systems, where porting larger chunks felt more productive, since that reduced the amount of tricky FFI code to be written only to be thrown away. These were ported in solo efforts. This includes the input/output “reader”, which is, unsurprisingly, one of fish’s biggest parts, ending up at about 13000 lines of Rust.
During the port, we hit a bunch of snags with (auto)cxx. Sometimes it would just not understand a particular C++ construct, and we spent a lot of time trying to figure out ways to please it. As an example, we introduced a struct on the C++ side that wrapped C++’s vector, because for some reason autocxx liked to complain about vector<wstring>. We had to fork it to add support for wstring/wchar, which is understandable because using wchar is a horrible decision - we only do it because it’s a historical mistake.
Similarly, we had to wrap some C++ variables in unique_ptr and similar to make the ownership rules understandable to (auto)cxx, or copy values that didn’t strictly need to be copied. This caused the performance during the port to go down quite a bit, but we regained all of it in most spots, and even beat the C++ version in some.
We also patched autocxx to remove the requirement to use unsafe to invoke any C++ API, because that would have obscured uses of unsafe that wouldn’t disappear just by porting the callee. We were building something temporary, so sometimes it is okay to do something a little underhanded.
If you used this for a permanent bridge between Rust and C++ in a few parts of your code, the unsafe markers might be useful, but in our case they were noise.
Because autocxx generated a lot of code, some tools also were less helpful than they’d usually be. rust-analyzer for instance was extremely slow.
So, even though our codebase was fairly amenable to being moved to Rust because we didn’t use exceptions or a lot of templates, autocxx isn’t the easiest to work with. It is absolutely magical that it works at all, and it enabled us to do this port, but it has a hard task to perform and isn’t perfect at it.
The initial PR was opened on 28th January 2023, merged on 19th February 2023
fish 3.7.0, another release in the C++ branch to flush out some accumulated improvements, was released in January 2024
The last C++ code was removed in January 2024 (and some additional test code was ported from C++ to C 12th of June 2024)
The first beta was released 17th of December 2024
The initial PR had a timeline of “handwaving, half a year”. It was clear to all of us that it might very well be entirely off, and we’re not disappointed that it was. Frankly, 14 months was still a pretty good pace, especially considering that we made a C++ release in-between, so it did not throw off our usual release cadence.
Most of the work was done by 7 people (going by those with at least 10 commits to “.rs” files), but we got a lot of help from interested community members.
The delay after that was down to a few reasons:
So if you are trying to draw any conclusions from this, consider the context: A group of people working on a thing in their free time, diverting some effort to work on something else, and deciding that after the work is finished it actually isn’t.
It won’t surprise anyone who has spent any time on this world of ours that Rust is not, in fact, perfect. We have some gripes with it.
Chief among them is how Rust handles portability. While it offers many abstractions over systems, allowing you to target a variety of systems with the same code,
when it comes to adapting your code to systems at a lower-level, it’s all based on enumerating systems by hand, using checks like #[cfg(any(target_os = "freebsd", target_os = "netbsd", target_os = "openbsd"))].
This is an imperfect solution, allowing you to miss systems and ignoring version differences entirely. From what we can tell, if FreeBSD 12 gains a function that we want to use, libc would add it, but calling it would then fail on FreeBSD 11 without a good way to check, at the moment.
But listing targets in our code is also fundamentally duplicating work that the libc crate (in our case) has already done. If you want to call libc::X, which is only defined on systems A, B and C, you need to put in that check for A, B and C yourself and if libc adds system D you need to add it as well. Instead of doing that, we are using our own rsconf crate to do compile-time feature detection in build.rs.
Most of this would be solved if Rust had some form of saying “compile this if that function exists” - #[cfg(has_fn = "fstatat")]. With that, the libc crate could do whatever checks it wants and fish would just follow what it did, and we could remove a lot of the use for rsconf. It would not really help support older distributions that lack some features, tho. That could be solved by something like the min_target_API_version cfg.
While we’re on portability, the tools also sometimes fail to consider other targets - clippy may warn about a conversion being useless when it isn’t on another system, it is often better to use if cfg!(...) instead of #[cfg(...)] because code behind the latter is eliminated very early, so it may be entirely wrong and only shows up when building on the affected system.
We’ve also had issues with localization - a lot of the usual Rust relies on format strings that are checked at compile-time, but unfortunately they aren’t translatable.
We ported printf from musl, which we required for our own printf builtin anyway, which allows us to reuse our preexisting format strings at runtime.
We’ve hit some false starts, dead ends and other kinds of mistakes. For instance we originally used a fancy macro to allow us to write our strings as "foo"L, but that did not end up carrying its weight and we removed it in favor of a regular L!("foo") macro call.
We were confused by a deprecation warning in the libc crate, which explains that “time_t” will be switched to 64-bit on musl in the future. We initially tried to work around it, adding a lot of wrappers to try to stay agnostic on that size, but only later figured out that it does not affect us, as we do not pass a time_t we get from one C library to another. (<a href="https://github.com/fish-shell/fish-shell/issues/10634" rel="nofollow">https://github.com/fish-shell/fish-shell/issues/10634</a>)
Some bugs appeared because we missed subtleties of the original code. Often this turned into a crash because we used asserts or assert’s modern cousin “.unwrap()”. This was often the easiest way to translate the C++, and sometimes it simply turned out to be not accurate, and had to be replaced with different error handling.
But overall most of these were, once found, pretty shallow - “it panics here, why would it do that? oh, this can be an Err? Okay, what leads to that? Ah, okay, let’s handle that in this way”.
We’ve also caused some friction by turning on link-time-optimization combined with having release builds as the default in CMake (currently needed to run the full test suite), which makes it easy to accidentally have very long build time.
A lot of the benefits of porting to Rust will appear over time, but some are already here.
Remember our issues with (n)curses? We will no longer have any, because we no longer use curses. Instead we switched to a Rust crate that gives us just what we need, which is access to terminfo and expanding its sequences. This removes some awkward global state, and means those building from source no longer need to ensure that curses is installed “correctly” on their system - cargo just downloads a crate and builds it.
We do still read terminfo, which means users need to install that, but that can be done at runtime, is preinstalled on all mainstream systems and if it can’t be found we just use an included copy of the xterm-256color definitions4.
We have also managed to create “self-installable” fish packages that include all the functions, completions and other asset files in the fish binary to be written out at runtime. That allowed us to create statically linked versions of fish (for linux this uses musl, because glibc has unavoidable crashes!), so for the first time we have one file you can download and run on any linux (the only requirement being that the architecture matches!).
This is a pretty big boon for people who want to use fish but sometimes ssh to servers, where they might not have root access to install a package. So they can just scp a single file and it’s available.
This might be possible with C23’s #embed, but Rust allowed us to do it now and, overall, pretty easily.
The one goal of the port we did not succeed in was removing CMake.
That’s because, while cargo is great at building things, it is very simplistic at installing them. Cargo wants everything in a few neat binaries,
and that isn’t our use case. Fish has about 1200 .fish scripts (961 completions, 217 associated functions), as well as about 130 pages of documentation (as html and man pages),
and the web-config tool and the man page generator (both written in python).
It also has a test suite that is light on unit tests but heavy on end-to-end script and interactive tests. The scripted tests run through our own littlecheck tool, which runs a script and compares its output to embedded comments. The interactive tests are driven by pexpect, which fakes terminal interaction and checks that the right thing happens when you press buttons.
We kept cmake, in a simplified form, for these tasks, but let it hand over the responsibility of building to cargo.
It would be possible to switch all that to a simpler task runner like Just or even plain old makefiles, but since we already have this system we’re keeping it for now. The upside is that the build process hasn’t really changed for packagers.
We’re also losing Cygwin as a supported platform for the time being, because there is no Rust target for Cygwin and so no way to build binaries targeting it. We hope that this situation changes in future, but we had also hoped it would improve during the almost two years of the port. For now, the only way to run fish on Windows is to use WSL.
We’ve succeeded. This was a gigantic project and we made it. The sheer scale of this is perhaps best expressed in numbers:
The beta works very well. Performance is usually slightly better in terms of time taken, memory use has a slightly higher floor but a lower ceiling - it will use 8M instead of 7M at rest, but e.g. globbing a big directory won’t make it go up as much. These things can all be improved, of course, but for a first result it is encouraging.
Fish is still a bit of an odd duck…fish as a Rust program. It has some bits that smell like C spirit, directly using the C API and e.g. passing around file descriptors instead of File objects. It still uses UTF-32 strings - which is why we are using a fork of the pcre2 crate because we couldn’t convince the pcre2-crate maintainer to add UTF-32 support. We hope to find a nicer solution here, but it wasn’t necessary for the first release.
The port wasn’t without challenges, and it did not all go entirely as planned. But overall, it went pretty dang well. We’re now left with a codebase that we like a lot more, that has already gained some features that would have been much more annoying to add with C++, with more on the way, and we did it while creating a separate 3.7 release that also included some cool stuff.
And we had fun doing it.
It’s the weekend, and I have some Thoughts about federated social media. So, buckle up, I guess, it’s time to start some fights.
Recently there has been some discourse about Bluesky’s latest fundraising round. I’ve been participating in conversations about this on Mastodon, and I think I might sometimes come across as a Mastodon partisan, but my feelings are complex and I really don’t want to be boosting the ActivityPub Fediverse without qualification.
So here are some qualifications.
To the extent that I am an ActivityPub partisan in the discourse between ActivityPub and ATProtocol, it is because I do not believe that Bluesky is a meaningfully decentralized social network. It is a social network, run by a company, which has a public API with some elements that might, one day, make it possible for it to be decentralized. But today, it is not, either practically or theoretically.
The Bluesky developers are putting in a ton of effort to maybe make it decentralized, hypothetically, someday. A lot of people think they will succeed. But ActivityPub (and, of course, Mastodon specifically) are already, today, meaningfully decentralized, as you can see on FediDB, there are instances with hundreds of thousands of people on them, before we even get to esoterica like the integrations Threads, Wordpress, Flipboard, and Ghost are doing.
The inciting incident for this post — that a lot of people are also angry about Bluesky raising millions of dollars from Evil Guys Doing Evil Stuff Capital — is indeed a serious concern. It lights the fuse that burns towards their eventual, inevitable incredible journey. ATProtocol is just an API, and that API will get shut off one day, whenever their funders get bored of the pretense of their network being “decentralized”.
At time of writing, it is also interesting that 3 of the 4 times that the CEO of Bluesky has even skeeted the word “blockchain” is to say “no blockchain”, to reassure users that the scam magnet of “Blockchain” is not actually near their product or protocol, which is a much harder position to maintain when your lead investor is “Blockchain Capital”.
I think these are all valid criticisms of Bluesky. But I also think that the actual engineers working on the product are aware of these issues, and are making a significant effort to address them or mitigate them in any way they can. All that work can still be easily incinerated by a slow quarter in terms of user growth numbers or a missed revenue forecast when the VCs are getting impatient, but it’s not nothing, it is a life’s work.
Really, who among us could not have our life’s ambitions trivially destroyed in an afternoon, simply because a billionaire decided that they should be? If you feel like you are safe from this, I have some bad news about how money works. So we are all doing our best in an imperfect system and maybe Bluesky is on to something here. That’s eminently possible. They’re certainly putting forth an earnest effort.
Meanwhile, not nearly as much has been made recently of Mastodon refusing funding from a variety of sources, when all indications are that funding is low, and plummeting, far below the level required to actually sustain the site, and they haven’t done a financial transparency report for over a year, and that report was already nearly a year late.
Mastodon and the fediverse are not nearly in a position to claim moral superiority over Bluesky. Sure, taking blockchain VC money might seem like a rookie mistake, but going out of business because you are spurning every possible source of funding is not that wise either.
Some might think that, sure, Mastodon the company might die but at least the Fediverse as a whole will keep going strong, right? Lots of people run their own instances! I even find elements of this argument convincing, and I think there is probably some truth to it. But to really believe this argument as claimed, that it’s a fait accompli that the fediverse will survive in some form, that all those self-run servers will be a robust network that will self-repair, requires believing some obviously false stuff. It is frankly unprofitable to run a Fediverse instance. Realistically, if you want to operate a mastodon server for yourself, it is going to cost at least $100/year once you include stuff like having a domain name, and managing the infrastructure costs is a complex problem that keeps getting harder to manage as the software itself gets slower.
Cory Doctorow has recently argued that this is all worth it, because at least on Mastodon, you’re in control, not at the whims of centralized website operators like Bluesky. In his words,
On Mastodon (and other services based on Activitypub), you can easily leave one server and go to another, and everyone you follow and everyone who follows you will move over to the new server. If the person who runs your server turns out to be imperfect in a way that you can’t endure, you can find another server, spend five minutes moving your account over, and you’re back up and running on the new server
He concludes:
Any system where users can leave without pain is a system whose owners have high switching costs and whose users have none
(Emphasis mine).
This is a beautiful vision. It is, however, an incorrect assessment of the state of the Fediverse as it stands today. It’s not true in two important ways:
First, if you look at any account of a user’s fediverse account migration, like this one from Steve Bate or this one from the Ente project or this one from Erin Kissane, you will see that it is “painful for the foreseeable future” or “wasn’t as seamless as advertised”, and that “the best time to […] migrate instances […] is never”. This language does not presage a pleasant experience, as Doctorow puts it, “without pain”.
Second, migration is an active process that requires engagement from the instance that hosts you. If you have been blocked or banned, or had your account terminated, you are just out of luck. You do not have control over your data or agency over your online identity unless you’ve shelled out the relatively exorbitant amount of money to actually operate your own instance.
In short, ActivityPub is no panacea. A federated system is not really a “decentralized” system, as much as it is a bunch of smaller centralized systems that all talk to each other. You still need to know, and care, about your social and financial relationship to the operators of your instance. There is probably no getting away from this, like, just generally on the Internet, no matter how much peer-to-peer software we deploy, but there certainly isn’t in the incomplete mess that is ActivityPub.
Neither Mastodon (or ActivityPub) nor Bluesky (or ATProtocol) has a comprehensive solution to the problem of decentralized social media. These companies, and these protocols, are both deeply flawed and if everything keeps bumping along as it is, I believe both are likely to fail. At different times, on different timelines, and for different reasons, but fail nonetheless.
However, these networks are both small and growing, and we are not yet in the phase of enshittification where margins are shrinking and audiences are captured and the screws must be tightened to juice revenue. There are stil possibilities. Mastodon is crowdfunded and what they lack in resources they make up for in flexibility and scrappiness. Bluesky has money and while there will eventually be a need to monetize somehow, they have plenty of runway to come up with that answer, and a lot of sophisticated protocol work has been done. Not enough to make a complete circut and allow users true, practical decentralization, but it’s not nothing, either.
Mastodon and Bluesky are both organizations with humans in them, and piles of
data that is roughly schema-compatible even if the nuances and details are
different. I know that there is a compatible model becuse thanks to both
platforms being relatively open, there is a functioning ActivityPub/ATProtocol
bridge in the form of Brid.gy Fed. You can use it
today, and I highly recommend that you do so, so that “choice of protocol” does
not fully define your audience. If you’re on bluesky, follow this
account, and if you’re on Mastodon or
elsewhere on the Fediverse, search for and follow @bsky.brid.gy@bsky.brid.gy.
The reality that fans of decentralized, independent social media must confront is that we are a tiny audicence right now. Whichever site we are looking at, we are talking about a few million monthly active users at best, in a world where even the pathetic husk of Twitter still has hundreds of millions and Facebook has billions. Interneceine fights are not going to get us anywhere. We need to build bridges and links and connect our networks as densely as possible. If I’m being honest, Bridgy Fed looks like a pretty janky solution, but it’s something, and we need to start doing something soon, so we do not collectively become a permanent minority that mass markets can safely ignore.
As users, we need to set an example, so that the developers of the respective platforms get their shit together and work together directly so that workarounds like Bridgy are not required. Frankly, this is mostly on the ActivityPub and Mastodon devs, as far as I can tell. Unfortunately, not a lot of this seems to be public, or at least I haven’t witnessed a lot of it directly, but I have heard repeatedly that the ActivityPub developers are prickly, and this is one high-profile public example where an ActivityPub partisan is incredibly, pointlessly hostile and borderline harrassing towards someone — Mike Masnick, a long-time staunch advocate for open protocols and open patents, someone with a Mastodon account, and thus as good a prospective ally as the ActivityPub fediverse might reasonably find — explaining some of the relative benefits of Bluesky.
Most of us are technology nerds in one way or another. In that way we can look at signifiers like “ActivityPub” and “ATProtocol”, and feel like these are hard boundaries around different all-encompassing structures for the future, and thus tribes we must join and support.
A better way to look at this, however, is to see social entities like Mastodon gGmbH and Bluesky PBC — or, more to the point, Fosstodon, SFBA Social, Hachyderm (and maybe, one day, even an instance which isn’t fully just for software development nerds), as groups that deploy these protocols to access some data that they publish, just as they might publish their website over HTTP or their newsletters over SMTP. There are technical challenges involved in bridging between mutually unintelligible domain models, but that is, like, network software's whole deal. Most software is just some kind of translation from one format or context to another. The best possible future for the fediverse is the one where users care as much about the distinction between ATProtocol and ActivityPub as they do about the distinction between POP3 and IMAP.
To both developers and users of these systems, I say: get it together. Be nice to each other. Because the rest of the social media ecosystem is sure as shit not going to be nice to us if we ever see even a hint of success and start to actually cut into their user base.
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