[j178]

Add a shared libc detector using standard loader paths, including legacy glibc loaders and musl alongside gcompat. Prefer glibc when both are available and report unrecognized Linux environments explicitly.

This adds the detection helper for subsequent toolchain installer integration.

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[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 2026-10-30T03:43:09.027703Z	d1abc1d	New commits

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• Comment "@codex review" or "@codex security review".

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[codecov]

Codecov Report

❌ Patch coverage is 89.62963% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.21%. Comparing base (08098ac) to head (d1abc1d).

Files with missing lines	Patch %	Lines
crates/prek/src/libc.rs	89.62%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2975      +/-   ##
==========================================
- Coverage   94.23%   94.21%   -0.02%     
==========================================
  Files         147      148       +1     
  Lines       31286    31421     +135     
==========================================
+ Hits        29482    29603     +121     
- Misses       1804     1818      +14     

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[prek-ci-bot]

📦 Cargo Bloat Comparison

Build: profiling + self-update (with debug info).

Metric	Base (bytes)	Head (bytes)	Change
.text	12,908,656	12,908,656	+0 (+0.00%)
File	273,227,688	273,169,576	-58,112 (-0.02%)

Largest symbol changes

Increases

Symbol	Base (bytes)	Head (bytes)	Change (bytes)
<tracing_subscriber::fmt::format::Format as tracing_subscriber::fmt::format::FormatEvent<tracing_subscriber::registry::sharded::Registry, tracing_subscriber::fmt::format::DefaultFields>>::format_event	5,861	5,893	+32
<prek::languages::ruby::installer::RubyInstaller>::download::{closure#0}	18,718	18,732	+14

Decreases

Symbol	Base (bytes)	Head (bytes)	Change (bytes)
<tracing_subscriber::layer::context::Context<tracing_subscriber::layer::layered::Layered<tracing_subscriber::filter::layer_filters::Filtered<tracing_subscriber::fmt::fmt_layer::Layer<tracing_subscriber::registry::sharded::Registry, tracing_…	454	405	-49

[prek-ci-bot]

⚡️ Hyperfine Benchmarks

Summary: 0 regressions, 1 improvements above the 10% threshold.

Environment

• OS: Linux 7.0.0-1017-azure
• CPU: 4 cores
• prek version: prek 0.5.7+38 (ca9e202 2026-10-30)
• Rust version: rustc 1.99.1 (58cf8f9c3 2026-10-13)
• Hyperfine version: hyperfine 2.0.0

CLI Commands

Benchmarking basic commands in the main repo:

prek --version

Command	Mean Wall Time [ms]	Change	Factor
prek-base --version	2.5 ± 0.1
prek-head --version	2.4 ± 0.1	-4.8%

prek list

Command	Mean Wall Time [ms]	Change	Factor
prek-base list	10.3 ± 0.6
prek-head list	9.9 ± 1.2	-4.0%

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

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

prek sample-config

Command	Mean Wall Time [ms]	Change	Factor
prek-base sample-config	3.0 ± 0.5
prek-head sample-config	2.8 ± 0.1	-7.0%

Cold vs Warm Runs

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

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

Command	Mean Wall Time [ms]	Change	Factor
prek-base run --all-files	18.5 ± 0.5
prek-head run --all-files	18.4 ± 0.8	-0.8%

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

Command	Mean Wall Time [ms]	Change	Factor
prek-base run --all-files	18.7 ± 0.4
prek-head run --all-files	18.7 ± 0.4	-0.1%

Full Hook Suite

Running the builtin hook suite on the benchmark workspace:

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

Command	Mean Wall Time [ms]	Change	Factor
prek-base run --all-files	18.8 ± 0.8
prek-head run --all-files	18.5 ± 0.7	-1.5%

Individual Hook Performance

Benchmarking each hook individually on the test repo:

prek run trailing-whitespace --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run trailing-whitespace --all-files	9.5 ± 0.3
prek-head run trailing-whitespace --all-files	9.0 ± 0.2	-4.4%

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

Command	Mean Wall Time [ms]	Change	Factor
prek-base run end-of-file-fixer --all-files	8.6 ± 0.2
prek-head run end-of-file-fixer --all-files	8.2 ± 0.2	-5.4%

prek run check-json --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run check-json --all-files	8.4 ± 2.5
prek-head run check-json --all-files	7.4 ± 0.2	-11.9%

✅ Performance improvement for prek run check-json --all-files: 11.8700% faster

prek run check-yaml --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run check-yaml --all-files	7.9 ± 0.2
prek-head run check-yaml --all-files	7.5 ± 0.2	-5.0%

prek run check-toml --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run check-toml --all-files	7.6 ± 0.1
prek-head run check-toml --all-files	7.4 ± 0.3	-1.9%

prek run check-xml --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run check-xml --all-files	7.7 ± 0.2
prek-head run check-xml --all-files	7.4 ± 0.2	-4.8%

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

Command	Mean Wall Time [ms]	Change	Factor
prek-base run detect-private-key --all-files	8.1 ± 0.2
prek-head run detect-private-key --all-files	7.8 ± 0.8	-4.2%

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

Command	Mean Wall Time [ms]	Change	Factor
prek-base run fix-byte-order-marker --all-files	8.2 ± 0.2
prek-head run fix-byte-order-marker --all-files	7.8 ± 0.2	-4.0%

Installation Performance

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

prek install-hooks (cold - no cache)

Command	Mean Wall Time [ms]	Change	Factor
prek-base install-hooks	5.4 ± 0.2
prek-head install-hooks	4.9 ± 0.1	-8.9%

prek install-hooks (warm - with cache)

Command	Mean Wall Time [ms]	Change	Factor
prek-base install-hooks	5.3 ± 0.5
prek-head install-hooks	4.8 ± 0.1	-9.8%

File Filtering/Scoping Performance

Testing different file selection modes:

prek run (staged files only)

Command	Mean Wall Time [ms]	Change	Factor
prek-base run	11.3 ± 0.2
prek-head run	11.4 ± 1.1	+0.4%

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

Command	Mean Wall Time [ms]	Change	Factor
prek-base run --files '*.json'	5.9 ± 0.1
prek-head run --files '*.json'	5.6 ± 0.1	-4.3%

Workspace Discovery & Initialization

Benchmarking hook discovery and initialization overhead:

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

Command	Mean Wall Time [ms]	Change	Factor
prek-base run --dry-run --all-files	7.7 ± 0.3
prek-head run --dry-run --all-files	7.3 ± 0.1	-4.5%

Meta Hooks Performance

Benchmarking meta hooks separately:

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

Command	Mean Wall Time [ms]	Change	Factor
prek-base run check-hooks-apply --all-files	8.9 ± 0.1
prek-head run check-hooks-apply --all-files	8.9 ± 0.5	-0.4%

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

Command	Mean Wall Time [ms]	Change	Factor
prek-base run check-useless-excludes --all-files	9.1 ± 0.5
prek-head run check-useless-excludes --all-files	8.8 ± 0.2	-2.9%

prek run identity --all-files

Command	Mean Wall Time [ms]	Change	Factor
prek-base run identity --all-files	8.0 ± 0.3
prek-head run identity --all-files	7.7 ± 0.3	-3.6%

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