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My understanding (which could be wrong) is that this is an attempt to preserve Debian's "global" view of dependencies, wherein each Rust package has a set of de
by woodruffw 2y ago
My understanding (which could be wrong) is that this is an attempt to preserve Debian's "global" view of dependencies, wherein each Rust package has a set of dependencies that's consistent with every other Rust package (or, if not every, as many as possible). This is similar to the C/C++ packaging endeavor, where dependencies on libraries are handled via dynamic linkage to a single packaged version that's compatible with all dependents.
If the above is right this contortion is similar to what's happened with Python packaging in Debian and similar, where distributions tried hard to maintain compatibility inside of a single global environment instead of allowing distinct incompatible resolutions within independent environments (which is what Python encourages).
I think the "problem" with cargo-deb is that it bundles all-in-one, i.e. doesn't devolve the dependencies back to the distribution. In other words, it's technically sound but not philosophically compatible with what Debian wants to do.
- wakawaka28 2y agoPackaging a distribution efficiently requires sharing as many dependencies as possible, and ideally hosting as much of the stuff as possible in an immutable state. I think that's why Debian rejects language-specific package distribution. How bad would it suck if every Python app you installed needed to have its own venv for example? A distro might have hundreds of these applications. As a maintainer you need to try to support installing them all efficiently with as few conflicts as possible. A properly maintained global environment can do that. Edit: I explained lower down but I also want to mention here, static linkage of binaries is a huge burden and waste of resources for a Linux distro. That's why they all tend to lean heavily on shared libraries unless it is too difficult to do so.
- woodruffw 2y ago> Packaging a distribution efficiently requires sharing as many dependencies as possible, and ideally hosting as much of the stuff as possible in an immutable state. I don't think any of this precludes immutability: my understanding is Debian could package every version variant (or find common variants without violating semver) and maintain both immutability and their global view. Or, they could maintain immutability but sacrifice their package-level global view (but not metadata-level view) by having Debian Rust source packages contain their fully vendored dependency set. The former would be a lot of work, especially given how manual the distribution packaging process is today. The latter seems more tractable, but requires distributions to readjust their approach to dependency tracking in ecosystems that fundamentally don't behave like C or C++ (Rust, Go, Python, etc.). > How bad would it suck if every Python app you installed needed to have its own venv for example? Empirically, not that badly. It's what tools like `uv` and `pipx` do by default, and it results in a markedly better net user experience (since Python tools actually behave like hermetic tools, and not implicit modifiers of global resolution state). It's also what Homebrew does -- every packaged Python formula in Homebrew gets shipped in its own virtual environment. > A properly maintained global environment can do that. Agreed. The problem is the "properly maintained" part; I would argue that ignoring upstream semver constraints challenges the overall project :-)
- wakawaka28 2y ago>I don't think any of this precludes immutability: my understanding is Debian could package every version variant (or find common variants without violating semver) and maintain both immutability and their global view. Debian is a binary-first distro so this would obligate them to produce probably 5x the binary packages for the same thing. Then you have higher chances of conflicts, unless I'm missing something. C and C++ shared libraries support coexistence of multiple versions via semver-based name schemes. I don't know if Rust packages are structured that well. >Empirically, not that badly. It's what tools like `uv` and `pipx` do by default, and it results in a markedly better net user experience (since Python tools actually behave like hermetic tools, and not implicit modifiers of global resolution state). It's also what Homebrew does -- every packaged Python formula in Homebrew gets shipped in its own virtual environment. These are typically not used to install everything that goes into a whole desktop or server operating system. They're used to install a handful of applications that the user wants. If you want to support as many systems as possible, you need to be mindful of resource usage. >I would argue that ignoring upstream semver constraints challenges the overall project :-) Yes it's a horrible idea. "Let's programmatically add a ton of bugs and wait for victims to report the bugs back to us in the future" is what I'm reading. A policy like that can be exploited by malicious actors. At minimum they need to ship the correct required versions of everything, if they ship anything.
- woodruffw 2y ago> Debian is a binary-first distro so this would obligate them to produce probably 5x the binary packages for the same thing. Then you have higher chances of conflicts, unless I'm missing something. Ah yeah, this wouldn't work -- instead, Debian would need to bite the bullet on Rust preferring static linkage and accept that each package might have different interior dependencies (still static and known, just not globally consistent). This doesn't represent a conflict risk because of the static linkage, but it's very much against Debian's philosophy (as I understand it). > I don't know if Rust packages are structured that well. Rust packages of different versions can gracefully coexist (they do already at the crate resolution level), but static linkage is the norm. > These are typically not used to install everything that goes into a whole desktop or server operating system. They're used to install a handful of applications that the user wants. I might not be understanding what you mean, but I don't think the user/machine distinction is super relevant in most deployments: in practice the server's software shouldn't be running as root anyways, so it doesn't matter much that it's installed in a user-held virtual environment. And with respect to resource consumption: unless I'm missing something, I think the resource difference between installing a stack with `pip` and installing that same stack with `apt` should be pretty marginal -- installers will pay a linear cost for each new virtual environment, but I can't imagine that being a dealbreaker in most setups (already multiple venvs are atypical, and you'd have to be pretty constrained in terms of storage space to have issues with a few duplicate installs of `requests` or similar).
- vbezhenar 2y ago> How bad would it suck if every Python app you installed needed to have its own venv for example? I would love to have that. Actually that's what I do: I avoid distribution software as much as possible and install it in venvs and similar ways.
- LtWorf 2y agoNow tell your grandmother to install a software that way and report back with the results please.
- charrondev 2y agoHahaha try asking your grandmother to install with apt and you get the same result. I’d estimate most Unix distributions are used in one 3 ways: - a technical application maintained by a tech savvy admin or a team of them, this would primarily be server usage. - desktop usage by a developer. - a restricted installation on older hardware for a non-tech savvy person. Their user account probably shouldn’t be given permission to install new software so none of this has any relevance to them. You average non-technical user certainly isn’t running Debian.
- LtWorf 2y ago> Hahaha try asking your grandmother to install with apt and you get the same result. Hahahaha surely you're being daft on purpose pretending you don't know there's a GUI to do this right? https://apps.kde.org/it/discover/ https://apps.kde.org/it/discover/ > You average non-technical user certainly isn’t running Debian. And you know this how? The same way you absolutely knew there's no GUI for apt? :D Also just fyi, IT employees don't have unlimited time, so they'd rather use apt than whatever weird sequence of steps you devised to install your own application.
- superkuh 2y ago>How bad would it suck if every Python app you installed needed to have its own venv for example? You just described every python3 project in 2024. Pretty much none will be expected to work with system python. But your point still stands, that's not a good thing that there is no python and only pythons. And it's not a good thing that there is no rustc only rustcs, etc, let alone trying to deal with cargo.
- woodruffw 2y agoIt’s not that they don’t work with the system Python, it’s that they don’t want to share the same global package namespace as the system Python. If you create a virtual environment with your system Python, it’ll work just fine. (This is distinct from Rust, where there’s no global package namespace at all.)
- fragmede 2y ago> How bad would it suck if every Python app you installed needed to have its own venv for example? Yeah I hacked together a shim that searches the python program's path for a directory called venv and shoves that into sys.path. Haven't hacked together reusing venv subdirs like pnpm does for JavaScript, but that's on my list.
- FridgeSeal 2y ago> How bad would it suck if every Python app you installed needed to have its own venv for example? You mean…the way many modern python apps install themselves? By setting up their own venv? Which is a sane and sensible thing to do, given pythons sub-par packaging experience.
- wakawaka28 2y agoYes, I'm indirectly saying that the way many contemporary apps are managed sucks. Python's packaging experience is fine as far as tools in that category go. The trouble happens when packages are abandoned, or make assumptions that are bad for users. Even if everyone was a good package author, there would be inevitable conflicts. The problem extends way beyond Python. This is why we have Docker, Snap, Flatpack, etc.: to work around inadequate maintenance and package conflicts without touching any code. These tools make it even easier for package authors to overlook bad habits. "Just use a venv bro" or "Just run it in Docker" is a common response to complaints.
- FridgeSeal 2y agoI want to challenge this assumption that “the distro way is the good way” and anything else that people are doing is the “wrong” way. I want to challenge it, because I’m beginning to be of the opinion that the “distro way” isn’t actually entirely suitable for a lot of software _anymore_. The fact that running something via docker is easier for people than the distro way indicates that there are significant UX/usability issues that aren’t being addressed. Docker as a mechanism to ship stuff for users does suck, and it’s a workaround for sure, but I’m not convinced that all those developers are “doing things wrong”.
- wakawaka28 2y ago>The fact that running something via docker is easier for people than the distro way indicates that there are significant UX/usability issues that aren’t being addressed. It's a lack of maintenance that isn't getting addressed. Either some set of dependencies isn't being updated, or the consumers of those dependencies aren't being updated to match changes in those dependencies. In some cases there is no actual work to do, and the container user is just too lazy to test anything newer. Why try to update when you can run the old stuff forever, ignoring even the slow upgrades that come with your Linux distro every few years? Some people would insist that running old stuff forever in a container is not "doing things wrong" because it works. But most people need to update for security reasons, and to get new features. It would be better to update gradually, and I think containers discourage gradual improvements as they are used in most circumstances. Of course you can use the technology to speed up the work of testing many different configurations as well, so it's not all bad. I fear there are far more lazy developers out there than industrious ones however.
- MrBuddyCasino 2y agoThis seems like a fools errand to me. Unlike C/C++, Rust apps typically have many small-ish dependencies, trying to align them to a dist-global approved version seems pointless and laborious. Pointless because Rust programs will have a lot less CVEs that would warrant such an approach.
- sshine 2y agoLaborious but not pointless. Rust programs have fewer CVEs for two reasons: its safe design, and its experienced user base. As it grows more widespread, more thoughtless programmers will create insecure programs in Rust. They just won’t often be caused by memory bugs.
- arccy 2y agoI'd think logic bugs are the majority of CVEs, and rust doesn't magically make those go away
- woodruffw 2y agoThe "majority of CVEs" isn't a great metric, since (1) anybody can file a CVE, and (2) CNAs can be tied to vendors, who are incentivized to pre-filter CVEs or not issue CVEs at all for internal incidents. Thankfully, we have better data sources. Chromium estimates that 70% of serious security bugs in their codebases stem from memory unsafety[1], and MSRC estimates a similar number for Microsoft's codebases[2]. (General purpose programming languages can't prevent logic bugs. However, I would separately argue that idiomatic Rust programs are less likely to experience classes of logic bugs that are common in C and C++ programs, in part because strong type systems can make invalid states unrepresentable.) [1]: https://www.chromium.org/Home/chromium-security/memory-safety/ https://www.chromium.org/Home/chromium-security/memory-safet... [2]: https://msrc.microsoft.com/blog/2019/07/we-need-a-safer-systems-programming-language/ https://msrc.microsoft.com/blog/2019/07/we-need-a-safer-syst...
- Asooka 2y agoThis is a general Linux distro problem, which is entirely self-inflicted. The distro should only carry the software for the OS itself and any applications for the user should come with all their dependencies, like on Windows. Yes, it kind of sucks that I have 3 copies of Chrome (Electron) and 7 copies of Qt on my Windows system, but that sure works a hell of a lot better than trying to synchronise the dependencies of a dozen applications. The precise split between OS service and user application can be argued endlessly, but that's for the maintainers to decide. The OS should not be a vehicle for delivering enduser applications. Yes, some applications should remain as a nice courtesy (e.g. GNU chess), but the rest should be dropped. Basically the split should be "does this project want to commit to working with major distros to keep its dependencies reasonable". I really hope we can move most Linux software to flatpak and have it updated and maintained separately from the OS. After decades of running both Linux and Windows, the Windows model of an application coming with all its dependencies in a single folder really is a lot better.
- yjftsjthsd-h 2y ago> Yes, it kind of sucks that I have 3 copies of Chrome (Electron) and 7 copies of Qt on my Windows system, but that sure works a hell of a lot better than trying to synchronise the dependencies of a dozen applications. Does it? Even if 2 of those chromiums and all of the QTs have actively exploited vulnerabilities and it's anyone's guess if/when the application authors might bother updating?
- Xylakant 2y agoA common downside is that the distribution picks the lowest common denominator of some dependency and all apps that require a newer version are held behind. That version may well be out of support and not receive fixes at all any more, which leaves the burden of maintenance on the distribution. Depending on the package maintainer, results may vary. (We sysadmins still remember debians effort to backport a fix to OpenSSL and breaking key generation.) This is clearly a tradeoff with no easy win for either side.
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- jppittma 2y agoI think what I’m missing is why all of this is necessary in a world without dynamic linking. We’re talking about purely build time dependencies, who cares about those matching across static binaries? If it’s this much of a headache, I’d rather just containerize the build and call it a day.
- woodruffw 2y agoThis is pretty much my thought as well -- FWICT the ultimate problem here isn't a technical one, but a philosophical disagreement between how Rust tooling expects to be built and how Debian would like to build the world. Debian could adopt Rust's approach with minor technical accommodations (as evidenced by `cargo-deb`), but to do so would be to shed Debian's commitment to global version management.
- mook 2y agoI believe that's usually so they can track when a library has a security vulnerability and needs to be updated, regardless of whether the upstream package itself has a version that uses the fixed library.
- cpuguy83 2y agoBecause they are also maintaining all those build time dependencies, including dealing with CVE's, back porting patches, etc.
- oneshtein 2y agoWorld without dynamic linking was ended eons ago. You are just too young to remember that. But, if you like it, find like-minded people here on HN and create a successful distro with static linking only. Maybe you will success where others failed. Thank you in advance.
- iknowstuff 2y agoThe sheer amount of useless busywork needed for this, only to end up with worse results and piss off application creators, is peak fucking Linux. If I was paid to do this kind of useless work for a living I’d probably be well on the way to off myself.
- XorNot 2y agoSoftware bill-of-materials work has become a huge focus in the security/SRE space lately, due to the existence of actually attempted or successful supply chain attacks. In that context, creating an ever increasing menagerie of dependencies of subtly different versions of the same thing is the pointless busy work because for the tiny bit of developer convenience, you're opening an exponentially growing amount of audit work to prove the dependencies are safe.
- flomo 2y agoYou make a great point, but I think we're going to see stuff like Microsoft selling 'supported NPM' to corps, rather than a zillion volunteers showing up to do monkey packaging work for Debian. (In fact, inserting some rando to fork the software makes the problem worse.)
- XorNot 2y agoRight but the point is then open source by necessity needs to constrain it's dependencies to sensible, auditable sets. But I'd note that a hypothetical "verified NPM" would also result in the same thing: Microsoft does not have infinite resources for such a thing, so you'd just have a limited set of approved deps yet again (which would in fact make piggy backing them relatively easy for distros). I can't see a way to slice it where it's reasonable to expect such a world to just support enormous nests of dependency versions.
- LtWorf 2y agoThe verified npm will be like the verified pypi: "this thing was built on github, but we actually have no fucking clue if it's a bitcoin miner or a legit library"
- NobodyNada 2y agoCargo even supports multiple incompatible versions of the same library coexisting within a single binary. E.g. an application I maintain depended on both winit 0.28 and 0.29 for a while, since one of my direct dependencies required winit 0.28, another required winit 0.29, and the API changed significantly between the two versions. So if the set of Rust applications packaged by Debian grows large enough, this "let's just pick one canonical version of each package" approach seems like a complete non-starter. I'd expect it to be much less effort for Debian to use the dependencies the application says it's compatible with, and build tooling allowing them to track/audit/vendor/upgrade Cargo dependencies as needed; rather than trying to shove the Cargo ecosystem into their existing tooling that is fundamentally different (and thus incompatible).