Skip site initialization in Python interpreter probes

[j178]

Pass -S when querying Python's version and base prefix. These values are available before site runs, so Python hook health checks can skip site-packages and startup customization.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-02T03:10:17.279147Z	f6b62d8	PR opened

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[Copilot]

Copilot review overview

🟢 Approval recommended

The probe reads only sys metadata available without site initialization, and no blocking issues were identified.

Review effort: Balanced
Findings: None

What changed in this PR

Skips Python site initialization when probing interpreter metadata for hook health checks.

Changes:

• Adds -S alongside -I to avoid loading site-packages and startup customization.

File	Description
crates/​prek/​src/​languages/​python/​python.rs	Disables site initialization during interpreter probes.

---

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.28%. Comparing base (412ae22) to head (f6b62d8).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2822   +/-   ##
=======================================
  Coverage   94.28%   94.28%           
=======================================
  Files         142      142           
  Lines       30749    30750    +1     
=======================================
+ Hits        28993    28994    +1     
  Misses       1756     1756           

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[prek-ci-bot]

📦 Cargo Bloat Comparison

.text size change: +0.00% (12.9 MiB → 12.9 MiB)

Expand for cargo-bloat output

Head Branch Results

File  .text     Size             Crate Name
0.1%   2.5% 332.0KiB        aws_lc_sys aws_lc_0_45_0_aes_gcm_encrypt_avx512
0.1%   2.5% 332.0KiB        aws_lc_sys aws_lc_0_45_0_aes_gcm_decrypt_avx512
0.0%   0.7%  94.9KiB              prek <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
0.0%   0.4%  50.3KiB annotate_snippets annotate_snippets::renderer::render::render
0.0%   0.4%  47.5KiB              prek <<prek::config::hook::HookWire as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<&mut <serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
0.0%   0.3%  45.0KiB              prek <<prek::config::Config as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<&mut <serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
0.0%   0.3%  40.7KiB              prek <prek::cli::RunOptions as clap_builder::derive::Args>::augment_args
0.0%   0.3%  33.2KiB              prek prek::run::{closure#0}
0.0%   0.2%  32.7KiB              prek <prek::languages::rust::rust::Rust as prek::languages::LanguageBackend>::install::{closure#0}
0.0%   0.2%  30.5KiB              prek prek::cli::update::update::{closure#0}
0.0%   0.2%  29.9KiB      serde_saphyr <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
0.0%   0.2%  29.5KiB      serde_saphyr <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
0.0%   0.2%  28.6KiB              toml <toml::de::deserializer::value::ValueDeserializer as serde_core::de::Deserializer>::deserialize_any::<<prek::config::hook::HookWire as serde_core::de::Deserialize>::deserialize::__Visitor>
0.0%   0.2%  28.0KiB        aws_lc_sys aws_lc_0_45_0_edwards25519_scalarmuldouble_alt
0.0%   0.2%  27.9KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  27.6KiB              prek <prek::languages::ruby::installer::RubyInstaller>::install::{closure#0}
0.0%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_45_0_edwards25519_scalarmuldouble
0.0%   0.2%  27.1KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  27.0KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  27.0KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
4.1%  87.1%  11.2MiB                   And 20737 smaller methods. Use -n N to show more.
4.7% 100.0%  12.9MiB                   .text section size, the file size is 276.3MiB

Base Branch Results

File  .text     Size             Crate Name
0.1%   2.5% 332.0KiB        aws_lc_sys aws_lc_0_45_0_aes_gcm_encrypt_avx512
0.1%   2.5% 332.0KiB        aws_lc_sys aws_lc_0_45_0_aes_gcm_decrypt_avx512
0.0%   0.7%  94.9KiB              prek <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
0.0%   0.4%  50.3KiB annotate_snippets annotate_snippets::renderer::render::render
0.0%   0.4%  47.5KiB              prek <<prek::config::hook::HookWire as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<&mut <serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
0.0%   0.3%  45.0KiB              prek <<prek::config::Config as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<&mut <serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
0.0%   0.3%  41.2KiB              prek <prek::cli::RunOptions as clap_builder::derive::Args>::augment_args
0.0%   0.3%  33.2KiB              prek prek::run::{closure#0}
0.0%   0.3%  32.9KiB              prek <prek::languages::rust::rust::Rust as prek::languages::LanguageBackend>::install::{closure#0}
0.0%   0.2%  30.5KiB              prek prek::cli::update::update::{closure#0}
0.0%   0.2%  29.9KiB      serde_saphyr <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
0.0%   0.2%  29.5KiB      serde_saphyr <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
0.0%   0.2%  28.8KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  28.6KiB              toml <toml::de::deserializer::value::ValueDeserializer as serde_core::de::Deserializer>::deserialize_any::<<prek::config::hook::HookWire as serde_core::de::Deserialize>::deserialize::__Visitor>
0.0%   0.2%  28.0KiB        aws_lc_sys aws_lc_0_45_0_edwards25519_scalarmuldouble_alt
0.0%   0.2%  27.9KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  27.6KiB              prek <prek::languages::ruby::installer::RubyInstaller>::install::{closure#0}
0.0%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_45_0_edwards25519_scalarmuldouble
0.0%   0.2%  27.1KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  27.1KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
4.1%  87.1%  11.2MiB                   And 20755 smaller methods. Use -n N to show more.
4.7% 100.0%  12.9MiB                   .text section size, the file size is 276.3MiB

[prek-ci-bot]

⚡️ Hyperfine Benchmarks

Summary: 0 regressions, 0 improvements above the 10% threshold.

Environment

• OS: Linux 6.17.0-1022-azure
• CPU: 4 cores
• prek version: prek 0.5.4+31 (7b7ecb1 2026-10-02)
• Rust version: rustc 1.99.0 (b940084d7 2026-09-28)
• Hyperfine version: hyperfine 1.20.0

CLI Commands

Benchmarking basic commands in the main repo:

prek --version

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base --version	2.3 ± 0.1	2.1	2.5	1.02 ± 0.05
prek-head --version	2.2 ± 0.1	2.1	2.5	1.00

prek list

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base list	9.1 ± 0.2	8.9	10.3	1.00 ± 0.07
prek-head list	9.1 ± 0.6	8.8	14.3	1.00

prek validate-config .pre-commit-config.yaml

⏭️ Skipped: .pre-commit-config.yaml not found

prek sample-config

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base sample-config	2.6 ± 0.2	2.4	3.6	1.00
prek-head sample-config	2.6 ± 0.5	2.4	5.7	1.01 ± 0.19

Cold vs Warm Runs

Comparing first run (cold) vs subsequent runs (warm cache):

prek run --all-files (cold - no cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --all-files	17.0 ± 0.6	16.5	18.4	1.00 ± 0.04
prek-head run --all-files	16.9 ± 0.3	16.6	17.4	1.00

prek run --all-files (warm - with cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --all-files	17.0 ± 0.6	16.5	19.1	1.01 ± 0.04
prek-head run --all-files	16.8 ± 0.3	16.3	17.7	1.00

Full Hook Suite

Running the builtin hook suite on the benchmark workspace:

prek run --all-files (full builtin hook suite)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --all-files	17.2 ± 0.5	16.5	19.0	1.01 ± 0.03
prek-head run --all-files	17.0 ± 0.3	16.3	18.2	1.00

Individual Hook Performance

Benchmarking each hook individually on the test repo:

prek run trailing-whitespace --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run trailing-whitespace --all-files	8.3 ± 0.2	8.0	8.9	1.01 ± 0.03
prek-head run trailing-whitespace --all-files	8.2 ± 0.1	8.0	8.5	1.00

prek run end-of-file-fixer --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run end-of-file-fixer --all-files	7.7 ± 0.6	7.4	10.8	1.01 ± 0.09
prek-head run end-of-file-fixer --all-files	7.6 ± 0.2	7.3	8.7	1.00

prek run check-json --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-json --all-files	6.7 ± 0.5	6.5	9.1	1.01 ± 0.07
prek-head run check-json --all-files	6.6 ± 0.1	6.5	6.8	1.00

prek run check-yaml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-yaml --all-files	7.0 ± 0.7	6.8	10.4	1.02 ± 0.10
prek-head run check-yaml --all-files	6.9 ± 0.1	6.7	7.1	1.00

prek run check-toml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-toml --all-files	6.8 ± 0.6	6.5	9.8	1.02 ± 0.09
prek-head run check-toml --all-files	6.7 ± 0.1	6.5	6.8	1.00

prek run check-xml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-xml --all-files	6.7 ± 0.1	6.6	7.1	1.00
prek-head run check-xml --all-files	6.9 ± 0.8	6.5	10.9	1.02 ± 0.12

prek run detect-private-key --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run detect-private-key --all-files	7.2 ± 0.1	7.0	7.7	1.00 ± 0.03
prek-head run detect-private-key --all-files	7.1 ± 0.2	7.0	8.0	1.00

prek run fix-byte-order-marker --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run fix-byte-order-marker --all-files	7.2 ± 0.0	7.1	7.3	1.00 ± 0.01
prek-head run fix-byte-order-marker --all-files	7.1 ± 0.1	7.0	7.3	1.00

Installation Performance

Benchmarking hook installation (fast path hooks skip Python setup):

prek install-hooks (cold - no cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base install-hooks	4.4 ± 0.1	4.3	4.5	1.01 ± 0.02
prek-head install-hooks	4.4 ± 0.1	4.3	4.5	1.00

prek install-hooks (warm - with cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base install-hooks	4.5 ± 0.0	4.5	4.5	1.00 ± 0.02
prek-head install-hooks	4.5 ± 0.1	4.4	4.6	1.00

File Filtering/Scoping Performance

Testing different file selection modes:

prek run (staged files only)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run	10.2 ± 0.1	10.1	10.4	1.00
prek-head run	10.4 ± 0.9	10.0	14.1	1.02 ± 0.09

prek run --files '*.json' (specific file type)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --files '*.json'	5.4 ± 1.0	5.1	9.6	1.02 ± 0.26
prek-head run --files '*.json'	5.3 ± 0.9	5.0	9.2	1.00

Workspace Discovery & Initialization

Benchmarking hook discovery and initialization overhead:

prek run --dry-run --all-files (measures init overhead)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --dry-run --all-files	6.9 ± 0.4	6.7	8.6	1.02 ± 0.06
prek-head run --dry-run --all-files	6.8 ± 0.1	6.6	6.9	1.00

Meta Hooks Performance

Benchmarking meta hooks separately:

prek run check-hooks-apply --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-hooks-apply --all-files	8.0 ± 0.0	7.9	8.0	1.00
prek-head run check-hooks-apply --all-files	8.0 ± 0.1	7.9	8.2	1.01 ± 0.01

prek run check-useless-excludes --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-useless-excludes --all-files	8.0 ± 0.1	7.9	8.1	1.01 ± 0.01
prek-head run check-useless-excludes --all-files	8.0 ± 0.0	7.9	8.0	1.00

prek run identity --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run identity --all-files	6.9 ± 0.1	6.8	7.1	1.00
prek-head run identity --all-files	7.0 ± 0.1	6.8	7.1	1.01 ± 0.02