Rust should not try to fetch non-existing pre-built binaries for unsupported archs

[barracuda156]

To be clear, I did not try to force installation of Rust somehow, I was merely updating a Python port, which, as it turned out, has been broken by a recent update which requires Rust.

At the moment there is no support for any macOS PowerPC systems with Rust, whether upstream or Macports. While it might be feasible to fix it, just no one tried with enough motivation, it is certainly meaningless to fetch pre-built binaries, which cannot exist. It is also misleading because it looks like a fetch error, while in reality it is not.

Warning: All compilers are either blacklisted or unavailable; defaulting to first fallback option
Warning: configured user/group macports does not exist, will build as root
--->  Computing dependencies for rust.
--->  Fetching distfiles for rust
--->  rustc-1.71.1-src.tar.gz does not exist in /opt/local/var/macports/distfiles/rust
--->  Attempting to fetch rustc-1.71.1-src.tar.gz from https://static.rust-lang.org/dist
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  263M  100  263M    0     0   251T      0 --:--:-- --:--:-- --:--:-- 1531k
--->  rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz does not exist in /opt/local/var/macports/distfiles/rust
--->  Attempting to fetch rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz from https://github.com/MarcusCalhoun-Lopez/rust/releases/download/1.71.1
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     9    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
--->  Attempting to fetch rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz from http://distfiles.macports.org/rust
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   126    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
--->  Attempting to fetch rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz from http://nue.de.distfiles.macports.org/rust
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   291    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
--->  Attempting to fetch rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz from http://mirror.fcix.net/macports/distfiles/rust
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   153    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
--->  Attempting to fetch rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz from http://aarnet.au.distfiles.macports.org/pub/macports/distfiles/rust
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   278    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
--->  Attempting to fetch rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz from http://atl.us.distfiles.macports.org/rust
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   365    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
--->  Attempting to fetch rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz from http://cjj.kr.distfiles.macports.org/rust
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   146    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
--->  Attempting to fetch rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz from http://cph.dk.distfiles.macports.org/rust
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   196    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
--->  Attempting to fetch rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz from http://fco.it.distfiles.macports.org/rust
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   146    0     0    0     0      0      0 --:--:--  0:00:02 --:--:--     0
--->  Attempting to fetch rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz from http://fra.de.distfiles.macports.org/rust
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   279    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
--->  Attempting to fetch rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz from http://jog.id.distfiles.macports.org/macports/distfiles/rust
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   168    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
--->  Attempting to fetch rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz from http://kmq.jp.distfiles.macports.org/rust
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   305    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
--->  Attempting to fetch rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz from http://mse.uk.distfiles.macports.org/rust
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   196    0     0    0     0      0      0 --:--:--  0:00:03 --:--:--     0
--->  Attempting to fetch rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz from http://pek.cn.distfiles.macports.org/macports/distfiles/rust
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   153    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
--->  Attempting to fetch rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz from http://ykf.ca.distfiles.macports.org/MacPorts/mpdistfiles/rust
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   162    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
--->  Attempting to fetch rust-std-1.70.0+0-powerpc-macports-darwin10.tar.gz from http://ywg.ca.distfiles.macports.org/mirror/macports/distfiles/rust
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   153    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
Error: Failed to fetch rust: The requested URL returned error: 404
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_rust/rust/main.log for details.
Error: Problem while installing rust

[catap (Kirill A. Korinsky)]

Well,

I'm waiting until mrust fully support rust-1.74 and I think it should happen in month or so.

After that I'll make another attempt to make a self bootstrap of rusts

[ryandesign (Ryan Carsten Schmidt)]

Replying to barracuda156:

At the moment there is no support for any macOS PowerPC systems with Rust, whether upstream or Macports. While it might be feasible to fix it, just no one tried with enough motivation, it is certainly meaningless to fetch pre-built binaries, which cannot exist.

I don't think this port should need to do anything specifically to prevent fetching of archives. Instead, the port should indicate the architectures (using supported_archs) and OS versions (using platforms) on which it works and let MacPorts base handle the rest.

it looks like a fetch error, while in reality it is not.

That's tracked in #68869.

[ryandesign (Ryan Carsten Schmidt)]

Er, I see now you were asking about fetching nonexistent distfiles, not archives, which is a valid concern, although possibly still solved by properly indicating which systems are supported.

[MarcusCalhoun-Lopez (Marcus Calhoun-Lopez)]

I believe this can now be closed since the rust Portfile now indicates lack of PowerPC support via supported_archs (​https://github.com/macports/macports-ports/blob/342989ea6af61cc58d6b5a799367a447debad55a/lang/rust/Portfile#L47).