Re: [gentoo-dev] [RFC] making rust-bin ordered first in virtual/rust

[Georgy Yakovlev]

On Mon, 2022-01-17 at 21:58 -0500, Ionen Wolkens wrote:
> On Mon, Jan 17, 2022 at 03:24:23PM -0800, Georgy Yakovlev wrote:
> > Hi,
> >
> > I've been approached multiple times with that request, and a lot of
> > time I see new users completely destroyed by rust build time and
> > disk
> > space requirements.
>
> fwiw it may be a bit mitigated by the new desktop stages that come
> with
> rust, or at least it won't be the first thing they see when they try
> to build their brand new desktop install until a rust update.
>
> It's nice if users can get a basic desktop before worrying about how
> to
> handle rust. Not that desktop stages are heavily visible/known so new
> users may not always pick them.
indeed it helps, but it takes time for users to discover/consider this.
it mostly hits very new users or users of containers/vms, who don't
have enough disk space or ram.
>
> >
> > WDYT about switching order of rusts in a virtual?
> >
> > RDEPEND="|| (
> >         ~dev-lang/rust-${PV}
> >         ~dev-lang/rust-bin-${PV}
> > )"
> >
> >
> > becomes
> >
> > RDEPEND="|| (
> >         ~dev-lang/rust-bin-${PV}
> >         ~dev-lang/rust-${PV}
> > )"
> >
> >
> > Existing installs should be unaffected ofc.
> > But portage may prefer to depclean rust and not rust-bin if both
> > are
> > present.
>
> Haven't tested how it reacts, but wouldn't that be an issue with
> system-bootstrap in situations where it pulls rust-bin to build
> itself?
it can build itself with non-bin too. as long as it's same or ver-
minus-1 and is installed, if not installed it will pull rust-bin of
matching version.
also system-bootstrap is stable-masked (for various reasons), so I'm
not too worried about it. ~kw users know their way around.

>
> > Users who wish to use source version at all times can just add it
> > to
> > world file.
> >
> > I see both positives and negatives of doing that, but would like to
> > reach out to community first.
>
> Unsure what I like best, I generally agree should default to sources
> but I do see new users complaining about building rust every few
> days.
> Not that the step of telling them that rust-bin exists is that bad
> (part of the issue is that they don't know it's an option).
>

If I had clear answer myself I would not be asking opinions here =)
just trying to understand if I'm missing something or my view is too
different.
developer and user opinions all are helpful to build picture.
I receive at least weekly complaint about how resource-intensive rust
build is, that counts too.

for now on stable systems, if user types, let's say,
 $ emerge ripgrep

with USE=-system-bootsrap (the default):
portage will pull virtual/rust, which will pull dev-lang/rust, which
will bootstrap itself by downloading proper rust-bin tarball, but not
as a package, just as a tarball behind the scenes.

with USE=system-bootstrap:
portage will pull virtual/rust, which will pull dev-lang/rust-bin, and
build dev-lang/rust, to build ripgrep.

USE=system-llvm (also stable-masked) complicates picture even more.

We've had openjdk-bin and icedtea-bin as default provider for as long
as I can remember, before I started to maintain it. works fine.

PS:
and just to be clear - I'm not pushing for it, just asking for input.