Could not resolve host in elan toolchain install #112

Erotemic · 2023-10-08T23:01:28Z

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

The text was updated successfully, but these errors were encountered:

kim-em · 2023-10-09T03:18:53Z

@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 · 2023-10-09T17:51:42Z

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 · 2023-11-19T15:13:05Z

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 · 2023-12-10T16:02:25Z

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.

rustup working without entering proot

sorry for my English.

dhuux · 2023-12-10T17:54:41Z

@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.

bernborgess · 2024-11-15T16:34:08Z

@dhuux Did you manage to get lake to run? I was able to install the toolchain but whenever I try running lake I just get:

error: command failed 'lake'
info: caused by: No such file or directory (os error 2)

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Could not resolve host in elan toolchain install #112

Could not resolve host in elan toolchain install #112

Erotemic commented Oct 8, 2023

kim-em commented Oct 9, 2023

Erotemic commented Oct 9, 2023

neuring commented Nov 19, 2023

dhuux commented Dec 10, 2023

dhuux commented Dec 10, 2023

bernborgess commented Nov 15, 2024

Could not resolve host in elan toolchain install #112

Could not resolve host in elan toolchain install #112

Comments

Erotemic commented Oct 8, 2023

Environment

kim-em commented Oct 9, 2023

Erotemic commented Oct 9, 2023

neuring commented Nov 19, 2023

dhuux commented Dec 10, 2023

dhuux commented Dec 10, 2023

bernborgess commented Nov 15, 2024