[Pkg-rust-maintainers] On bootstrapping cargo

[Luca Bruno]

Hi all,
just a quick mail to say that I was looking a bit into a cleaner way to 
bootstrap cargo (ie. without embedding a binary).

It is my understanding that some other distros (Bitrig, some *BSD) are 
currently relying on this:
https://github.com/dhuseby/cargo-bootstrap

It is a minimal python script that mimics cargo fetch&build capabilities to
locally build a stage0 cargo. It needs python-dulwich (already in debian) and 
python-pytoml (I've just uploaded this to NEW).

With those, and embedding only crate-index plus all cargo source dependencies,
I was more or less able to bootstrap it from sources only.

Some comments:
 * git2-rs depends on newer libgit2, I added a note here[0] and pinged
   debian maintainer for 0.23.0-1 ETA
 * I had some issue with curl-sys and openssl-sys, but this was probably my
   mistake
 * post-configure (ie. stage1), Cargo.{toml|lock} needs to be somehow adjusted
   to use local crates. I haven't yet looked into this, pointers are welcome.

I still have no idea how to ship all cargo dependencies in debian (embedded 
with cargo? multiple source-only package?), but at least it looks like a 
start :)

[0] https://github.com/alexcrichton/git2-rs/issues/32#issuecomment-125539959

Ciao, Luca

-- 
 .''`.  ** Debian GNU/Linux **  | Luca Bruno (kaeso)
: :'  :   The Universal O.S.    | lucab (AT) debian.org
`. `'`                          | GPG: 0xBB1A3A854F3BBEBF
  `-     http://www.debian.org 	| Debian GNU/Linux Developer
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