espup install fails with unsupported_file_extension: 'part' during Xtensa Rust installation

[markhaehnel]

Bug description

Running espup install fails while installing the Xtensa Rust toolchain.

The error reported is:

Error: espup::toolchain::unsupported_file_extension

  × Unsuported file extension: 'part'

This appears to happen because espup downloads the Xtensa Rust archive to a temporary *.part file and then tries to extract that temporary file, so the extractor sees the extension part instead of the real archive type.

I think this is a regression that came up with 0.17.0 as 0.16.0 is working fine.

• Would you like to work on a fix? [n]

To Reproduce

Steps to reproduce the behavior:

1. Install the latest espup
2. Run espup install
3. Wait for the Xtensa Rust installation step
4. Observe the failure with unsupported_file_extension: 'part'

Expected behavior

espup install should complete successfully and extract the downloaded Xtensa Rust archive instead of failing on the temporary .part file.

Screenshots

Not applicable.

Environment

• OS: Linux (Ubuntu 24.04.4)
• espup version: v0.17.0

Additional context

Full output:

[info]: Installing the Espressif Rust ecosystem
[info]: Checking Rust installation
[info]: Installing Xtensa Rust 1.93.0.0 toolchain
[info]: Installing Xtensa LLVM
[info]: Installing RISC-V Rust targets ('riscv32imc-unknown-none-elf', 'riscv32imac-unknown-none-elf' and 'riscv32imafc-unknown-none-elf') for 'stable' toolchain
[info]: Installing GCC (xtensa-esp-elf)
[warn]: Installation for 'Xtensa Rust' failed, retrying. Error: Unsuported file extension: 'part'
[warn]: Failed to detect version of Xtensa Rust, reinstalling it
[info]: Uninstalling Xtensa Rust toolchain
[info]: Installing Xtensa Rust 1.93.0.0 toolchain
[warn]: Installation for 'Xtensa Rust' failed, retrying. Error: Unsuported file extension: 'part'
[warn]: Failed to detect version of Xtensa Rust, reinstalling it
[info]: Uninstalling Xtensa Rust toolchain
[info]: Installing Xtensa Rust 1.93.0.0 toolchain
[warn]: Installation for 'Xtensa Rust' failed, retrying. Error: Unsuported file extension: 'part'
[warn]: Failed to detect version of Xtensa Rust, reinstalling it
[info]: Uninstalling Xtensa Rust toolchain
[info]: Installing Xtensa Rust 1.93.0.0 toolchain
[warn]: Installation for 'Xtensa Rust' failed, retrying. Error: Unsuported file extension: 'part'
[00:00:00] ######################################## 4047448/4047448 rust-src.tar.xz download complete
[00:00:00] ######################################## 4047448/4047448 rust-src.tar.xz download complete
[00:00:00] ######################################## 4047448/4047448 rust-src.tar.xz download complete
[00:00:00] ######################################## 4047448/4047448 rust-src.tar.xz download complete                                     Error: espup::toolchain::unsupported_file_extension

  × Unsuported file extension: 'part'

From reviewing the current install flow, this looks like a regression in espup rather than an environment issue.