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leanprover / elan

The Lean version manager
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Could not resolve host in elan toolchain install #112

Open Erotemic opened 11 months ago

Erotemic commented 11 months ago

I'm encountering an error while trying to install a specific lean toolchain with elan. I'm not sure what could be happening, if this is a problem with elan, or if this is a user-error (and perhaps in need of documentation?).

Running:

elan toolchain install leanprover/lean4:v4.2.0-rc1

Results in 

info: downloading component 'lean'
Error(Download(Msg("error during download")), State { next_error: Some(Error { description: "Couldn't resolve host name", code: 6, extra: Some("Could not resolve host: github.com") }), backtrace: InternalBacktrace { backtrace: None } })
error: could not download file from 'https://github.com/leanprover/lean4/releases/expanded_assets/v4.2.0-rc1' to '/home/joncrall/.elan/tmp/2ubd704ate32mmhf_file'
info: caused by: error during download
info: caused by: [6] Couldn't resolve host name (Could not resolve host: github.com)

However, I can ping github.com just fine.

Adding export RUST_BACKTRACE=1 results in 

info: downloading component 'lean'
Error(Download(Msg("error during download")), State { next_error: Some(Error { description: "Couldn't resolve host name", code: 6, extra: Some("Could not resolve host: github.com") }), backtrace: InternalBacktrace { backtrace: Some(   0: error_chain::backtrace::imp::InternalBacktrace::new
   1: error_chain::State::new
   2: download::curl::download
   3: download::download_to_path_with_backend
   4: elan_utils::utils::download_file_with_resume
   5: elan_utils::utils::download_file
   6: elan_dist::download::DownloadCfg::download_and_check
   7: elan_dist::manifestation::Manifestation::update
   8: elan_dist::dist::update_from_dist_
   9: elan_dist::dist::update_from_dist
  10: elan::install::InstallMethod::run
  11: elan::toolchain::Toolchain::install
  12: elan::toolchain::Toolchain::install_from_dist
  13: elan_init::elan_mode::update
  14: elan_init::elan_mode::main
  15: elan_init::main
  16: std::sys_common::backtrace::__rust_begin_short_backtrace
  17: std::rt::lang_start::{{closure}}
  18: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/core/src/ops/function.rs:284:13
      std::panicking::try::do_call
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:500:40
      std::panicking::try
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:464:19
      std::panic::catch_unwind
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panic.rs:142:14
      std::rt::lang_start_internal::{{closure}}
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/rt.rs:148:48
      std::panicking::try::do_call
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:500:40
      std::panicking::try
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:464:19
      std::panic::catch_unwind
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panic.rs:142:14
      std::rt::lang_start_internal
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/rt.rs:148:20
  19: main
) } })
error: could not download file from 'https://github.com/leanprover/lean4/releases/expanded_assets/v4.2.0-rc1' to '/home/joncrall/.elan/tmp/x_uvxifwr4bbdt8g_file'
info: caused by: error during download
info: caused by: [6] Couldn't resolve host name (Could not resolve host: github.com)
info: backtrace:

   0: error_chain::backtrace::imp::InternalBacktrace::new
   1: error_chain::State::new
   2: download::curl::download
   3: download::download_to_path_with_backend
   4: elan_utils::utils::download_file_with_resume
   5: elan_utils::utils::download_file
   6: elan_dist::download::DownloadCfg::download_and_check
   7: elan_dist::manifestation::Manifestation::update
   8: elan_dist::dist::update_from_dist_
   9: elan_dist::dist::update_from_dist
  10: elan::install::InstallMethod::run
  11: elan::toolchain::Toolchain::install
  12: elan::toolchain::Toolchain::install_from_dist
  13: elan_init::elan_mode::update
  14: elan_init::elan_mode::main
  15: elan_init::main
  16: std::sys_common::backtrace::__rust_begin_short_backtrace
  17: std::rt::lang_start::{{closure}}
  18: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/core/src/ops/function.rs:284:13
      std::panicking::try::do_call
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:500:40
      std::panicking::try
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:464:19
      std::panic::catch_unwind
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panic.rs:142:14
      std::rt::lang_start_internal::{{closure}}
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/rt.rs:148:48
      std::panicking::try::do_call
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:500:40
      std::panicking::try
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:464:19
      std::panic::catch_unwind
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panic.rs:142:14
      std::rt::lang_start_internal
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/rt.rs:148:20
  19: main

I installed elan with the following commands:

    # https://gist.github.com/jcommelin/1d45a0ea7a84a87db8a28a12e93cac32
    mkdir -p "$HOME"/tmp
    cd "$HOME"/tmp || return
    curl https://raw.githubusercontent.com/leanprover/elan/master/elan-init.sh -sSf > elan-init.sh
    chmod +x elan-init.sh
    ./elan-init.sh

Environment

Elan version:

> elan --version
elan 3.0.0 (cdb40bff5 2023-09-08)

OS: Ubuntu 22.04

semorrison commented 11 months ago

@Erotemic, I'm going to guess this was a transient problem at github. If you can still reproduce a day later, could you ping here and we can look at it?

Erotemic commented 11 months ago

It is still failing. This might be some setting on my machine, but I can't think of what it would be. I have two machines with nearly the same setup, the main difference is one is running 2010 hardware (ooo) and another is running 2020 hardware (toothbrush). On both my machines, I moved the toolchain folder in ~/.elan to toolchain-old and reran:

On both elan toolchain list reports no installed toolchains, but when running:

elan toolchain install leanprover/lean4:v4.2.0-rc1

on ooo I get:

info: downloading component 'lean'
Error(Download(Msg("error during download")), State { next_error: Some(Error { description: "Couldn't resolve host name", code: 6, extra: Some("Could not resolve host: github.com") }), backtrace: InternalBacktrace { backtrace: None } })
error: could not download file from 'https://github.com/leanprover/lean4/releases/expanded_assets/v4.2.0-rc1' to '/home/joncrall/.elan/tmp/5e3yjgdnzdija3mx_file'
info: caused by: error during download
info: caused by: [6] Couldn't resolve host name (Could not resolve host: github.com)

and on toothbrush I get:

  leanprover/lean4:v4.2.0-rc1 unchanged - (toolchain not installed)

which I also found to be weird. I tried a variant:

 elan toolchain install leanprover/lean4:stable

which on toothbrush resulted in:

info: syncing channel updates for 'stable'
info: latest update on stable, lean version v4.1.0
info: downloading component 'lean'
179.2 MiB / 179.2 MiB (100 %)   7.8 MiB/s ETA:   0 s
info: installing component 'lean'

I'm not sure why stable worked, but v4.2.0-rc1 gave the unchanged message.

And on ooo I get:

info: syncing channel updates for 'stable'
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error { description: "Couldn't resolve host name", code: 6, extra: Some("Could not resolve host: github.com") }', src/elan-utils/src/utils.rs:514:32
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

And with backtrace I get:

info: syncing channel updates for 'stable'
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error { description: "Couldn't resolve host name", code: 6, extra: Some("Could not resolve host: github.com") }', src/elan-utils/src/utils.rs:514:32
stack backtrace:
   0: rust_begin_unwind
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:593:5
   1: core::panicking::panic_fmt
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/core/src/panicking.rs:67:14
   2: core::result::unwrap_failed
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/core/src/result.rs:1651:5
   3: elan_utils::utils::fetch_url
   4: elan_utils::utils::fetch_latest_release_tag
   5: elan_dist::dist::update_from_dist_
   6: elan_dist::dist::update_from_dist
   7: elan::install::InstallMethod::run
   8: elan::toolchain::Toolchain::install
   9: elan::toolchain::Toolchain::install_from_dist
  10: elan_init::elan_mode::update
  11: elan_init::elan_mode::main
  12: elan_init::main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

with the full stack being:

info: syncing channel updates for 'stable'
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error { description: "Couldn't resolve host name", code: 6, extra: Some("Could not resolve host: github.com") }', src/elan-utils/src/utils.rs:514:32
stack backtrace:
   0:     0x7f805bbefb11 - std::backtrace_rs::backtrace::libunwind::trace::h752edb5e763c622a
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f805bbefb11 - std::backtrace_rs::backtrace::trace_unsynchronized::h186570be9d64c708
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f805bbefb11 - std::sys_common::backtrace::_print_fmt::h3c97392bc43f6100
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f805bbefb11 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h0a500936d7ce1aa3
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f805bc3c36f - core::fmt::rt::Argument::fmt::h49d8384db0e23147
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/core/src/fmt/rt.rs:138:9
   5:     0x7f805bc3c36f - core::fmt::write::hceee497f41d5c978
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/core/src/fmt/mod.rs:1094:21
   6:     0x7f805bbebcb7 - std::io::Write::write_fmt::h95250bef2fd518bf
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/io/mod.rs:1714:15
   7:     0x7f805bbef925 - std::sys_common::backtrace::_print::ha8144dbed1846c2c
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f805bbef925 - std::sys_common::backtrace::print::hf483708776650079
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f805bbf0ee3 - std::panicking::default_hook::{{closure}}::hf31b00cbd6179696
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:269:22
  10:     0x7f805bbf0c74 - std::panicking::default_hook::hb91091ef23c52620
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:288:9
  11:     0x7f805bbf1469 - std::panicking::rust_panic_with_hook::h1637607b7d82e47f
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:705:13
  12:     0x7f805bbf1367 - std::panicking::begin_panic_handler::{{closure}}::hefcd5d25990c0376
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:597:13
  13:     0x7f805bbeff76 - std::sys_common::backtrace::__rust_end_short_backtrace::h74318f6f4a659750
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/sys_common/backtrace.rs:151:18
  14:     0x7f805bbf10b2 - rust_begin_unwind
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:593:5
  15:     0x7f805b787903 - core::panicking::panic_fmt::h1cdc5ad0767cefdc
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/core/src/panicking.rs:67:14
  16:     0x7f805b787da3 - core::result::unwrap_failed::h0fba1ec415bdc4a5
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/core/src/result.rs:1651:5
  17:     0x7f805b8fdd00 - elan_utils::utils::fetch_url::h61908eec202ff432
  18:     0x7f805b8fdeaf - elan_utils::utils::fetch_latest_release_tag::h26b3b2f8d26eaf0e
  19:     0x7f805b866090 - elan_dist::dist::update_from_dist_::h658d6cd873d7e2e5
  20:     0x7f805b865823 - elan_dist::dist::update_from_dist::hf8f15589da492bb3
  21:     0x7f805b7f6fe4 - elan::install::InstallMethod::run::hcb83ed7990548610
  22:     0x7f805b7e55ef - elan::toolchain::Toolchain::install::h7489e05e37daa148
  23:     0x7f805b7e57b3 - elan::toolchain::Toolchain::install_from_dist::h9c3bd1d92802adb2
  24:     0x7f805b7a0316 - elan_init::elan_mode::update::he5a495aa7f13c835
  25:     0x7f805b79cfd5 - elan_init::elan_mode::main::h26b7f887853f8ae8
  26:     0x7f805b7c16cf - elan_init::main::hf84f4544d6e5cbd5
  27:     0x7f805b7b1663 - std::sys_common::backtrace::__rust_begin_short_backtrace::h3147485e1feaa76b
  28:     0x7f805b7b2399 - std::rt::lang_start::{{closure}}::h658c53cb01f309ea
  29:     0x7f805bbe50f2 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h53f7fdef9fa97f44
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/core/src/ops/function.rs:284:13
  30:     0x7f805bbe50f2 - std::panicking::try::do_call::h241dc6f55f440bfa
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:500:40
  31:     0x7f805bbe50f2 - std::panicking::try::h6fa7a7ecf68ec302
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:464:19
  32:     0x7f805bbe50f2 - std::panic::catch_unwind::h3adf6baef0afdbb9
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panic.rs:142:14
  33:     0x7f805bbe50f2 - std::rt::lang_start_internal::{{closure}}::hf1cf4178cf5b8437
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/rt.rs:148:48
  34:     0x7f805bbe50f2 - std::panicking::try::do_call::h7dbeb5f468ea2e7a
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:500:40
  35:     0x7f805bbe50f2 - std::panicking::try::h34a81bcdebb1642f
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:464:19
  36:     0x7f805bbe50f2 - std::panic::catch_unwind::hdd88670df2ed76f9
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panic.rs:142:14
  37:     0x7f805bbe50f2 - std::rt::lang_start_internal::h312f4ba9c2a0dedf
                               at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/rt.rs:148:20
  38:     0x7f805b7c19e5 - main

I don't know why the machines have different results. They are on the same network, and I tend to keep them in sync with each other. Both run ubuntu 22.04 and they ahve teh same elan version: elan 3.0.0 (cdb40bff5 2023-09-08). This also seems like a slightly different error than I originally reported. Any help debugging would be appreciated.

neuring commented 9 months ago

When trying to install a fresh elan installation I'm running into the same error.

$ curl https://raw.githubusercontent.com/leanprover/elan/master/elan-init.sh -sSf | sh 
...
Current installation options:

     default toolchain: stable
  modify PATH variable: yes

1) Proceed with installation (default)
2) Customize installation
3) Cancel installation
1

info: syncing channel updates for 'stable'
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error { description: "Couldn't resolve host name", code: 6, extra: Some("Could not resolve host: github.com") }', src/elan-utils/src/utils.rs:514:32
stack backtrace:
   0: rust_begin_unwind
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:593:5
   1: core::panicking::panic_fmt
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/core/src/panicking.rs:67:14
   2: core::result::unwrap_failed
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/core/src/result.rs:1651:5
   3: elan_utils::utils::fetch_url
   4: elan_utils::utils::fetch_latest_release_tag
   5: elan_dist::dist::update_from_dist_
   6: elan_dist::dist::update_from_dist
   7: elan::install::InstallMethod::run
   8: elan::toolchain::Toolchain::install
   9: elan::toolchain::Toolchain::install_from_dist
  10: elan_init::self_update::install
  11: elan_init::setup_mode::main
  12: elan_init::main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

It did install elan and other lean related programs, but it seems to me that it failed installing a toolchain. I can run lean now, but it just reports the following error:

error: no default toolchain configured. run `elan default stable` to install & configure the latest Lean 4 stable release.

Running the suggested command causes the original error again.

elan version: elan 3.0.0 (cdb40bff5 2023-09-08)

dhuux commented 9 months ago

i'm having the same problem in Termux. but my problem is known. since elan is a statically linked binary that does networking stuff and Termux is not FHS compliant it can't resolve DNS names because /etc/resolv.conf doesn't exist in Termux. so every time i'm downloading something with elan i have to launch Termux's proot script for resolv.conf to be accessible. it would be nice if there were a dynamically linked glibc based elan binary for Linux/aarch64 like rustup. so we don't have to install slow Termux proot distros to use these tools. Screenshot_20231210-180817_Termux

rustup working without entering proot 20231210_183857

sorry for my English.

dhuux commented 9 months ago

@Erotemic probably you have DNS lookup problems like me. you see, i got the same error when i tried to download lean but when elan is pointed to the right resolv.conf using proot -b command it's working fine.

i'm hoping for the dynamically linked elan binary for Linux Arm64. glibc would deal with the DNS lookups. i guess.

Screenshot_20231210-204252_Termux