Preserve system download policy when applying metadata

[j178]

Closes #2392

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[codecov]

Codecov Report

❌ Patch coverage is 93.00699% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.47%. Comparing base (928dc5c) to head (ee688f6).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
crates/prek/src/languages/version.rs	85.71%	8 Missing ⚠️
crates/prek/src/hook.rs	97.18%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2395      +/-   ##
==========================================
+ Coverage   93.38%   93.47%   +0.09%     
==========================================
  Files         129      130       +1     
  Lines       27637    28035     +398     
==========================================
+ Hits        25810    26207     +397     
- Misses       1827     1828       +1     

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[prek-ci-bot]

📦 Cargo Bloat Comparison

Binary size change: +0.68% (29.2 MiB → 29.4 MiB)

Expand for cargo-bloat output

Head Branch Results

 File  .text     Size             Crate Name
 1.1%   2.3% 332.0KiB        aws_lc_sys aws_lc_0_42_0_aes_gcm_encrypt_avx512
 1.1%   2.3% 332.0KiB        aws_lc_sys aws_lc_0_42_0_aes_gcm_decrypt_avx512
 0.3%   0.5%  79.5KiB              prek <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.2%   0.4%  55.1KiB              prek <<prek::config::Config as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
 0.2%   0.3%  49.4KiB annotate_snippets annotate_snippets::renderer::render::render
 0.2%   0.3%  47.0KiB              prek prek::run::{closure#0}
 0.1%   0.3%  38.4KiB              prek prek::cli::run::run::run::{closure#0}
 0.1%   0.2%  34.1KiB              prek <prek::cli::RunOptions as clap_builder::derive::Args>::augment_args
 0.1%   0.2%  30.1KiB     granit_parser <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
 0.1%   0.2%  28.0KiB        aws_lc_sys aws_lc_0_42_0_edwards25519_scalarmuldouble_alt
 0.1%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_42_0_edwards25519_scalarmuldouble
 0.1%   0.2%  27.2KiB              prek <<prek::config::RemoteHook as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
 0.1%   0.2%  26.2KiB              prek prek::cli::try_repo::try_repo::{closure#0}
 0.1%   0.2%  24.9KiB               xml <xml::reader::parser::PullParser>::dispatch_token
 0.1%   0.2%  24.6KiB              prek <prek::languages::node::installer::NodeInstaller>::install::{closure#0}
 0.1%   0.2%  24.3KiB              prek <<prek::config::LocalHook as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
 0.1%   0.2%  24.0KiB     granit_parser <granit_parser::scanner::Scanner<serde_saphyr::de::buffered_input::ReaderInput>>::fetch_more_tokens
 0.1%   0.2%  23.7KiB              prek <<prek::config::UpdateOptions as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
 0.1%   0.2%  22.3KiB         [Unknown] Lp384_montjscalarmul_alt_p384_montjadd
 0.1%   0.2%  22.2KiB              prek prek::archive::unzip::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
42.5%  88.4%  12.5MiB                   And 25974 smaller methods. Use -n N to show more.
48.1% 100.0%  14.1MiB                   .text section size, the file size is 29.4MiB

Base Branch Results

 File  .text     Size             Crate Name
 1.1%   2.3% 332.0KiB        aws_lc_sys aws_lc_0_42_0_aes_gcm_encrypt_avx512
 1.1%   2.3% 332.0KiB        aws_lc_sys aws_lc_0_42_0_aes_gcm_decrypt_avx512
 0.2%   0.5%  65.4KiB              prek <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.2%   0.4%  55.1KiB              prek <<prek::config::Config as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
 0.2%   0.3%  49.4KiB annotate_snippets annotate_snippets::renderer::render::render
 0.2%   0.3%  47.0KiB              prek prek::run::{closure#0}
 0.1%   0.3%  38.4KiB              prek prek::cli::run::run::run::{closure#0}
 0.1%   0.2%  34.3KiB              prek <prek::cli::RunOptions as clap_builder::derive::Args>::augment_args
 0.1%   0.2%  30.1KiB     granit_parser <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
 0.1%   0.2%  28.0KiB        aws_lc_sys aws_lc_0_42_0_edwards25519_scalarmuldouble_alt
 0.1%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_42_0_edwards25519_scalarmuldouble
 0.1%   0.2%  27.2KiB              prek <<prek::config::RemoteHook as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
 0.1%   0.2%  26.2KiB              prek prek::cli::try_repo::try_repo::{closure#0}
 0.1%   0.2%  24.9KiB               xml <xml::reader::parser::PullParser>::dispatch_token
 0.1%   0.2%  24.6KiB              prek <prek::languages::node::installer::NodeInstaller>::install::{closure#0}
 0.1%   0.2%  24.3KiB              prek <<prek::config::LocalHook as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
 0.1%   0.2%  24.0KiB     granit_parser <granit_parser::scanner::Scanner<serde_saphyr::de::buffered_input::ReaderInput>>::fetch_more_tokens
 0.1%   0.2%  23.7KiB              prek <<prek::config::UpdateOptions as serde_core::de::Deserialize>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map::<<serde_saphyr::de::deserializer::YamlDeserializer as serde_core::de::Deserializer>::deserialize_map::MA>
 0.1%   0.2%  22.8KiB              prek prek::archive::unzip::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
 0.1%   0.2%  22.3KiB         [Unknown] Lp384_montjscalarmul_alt_p384_montjadd
42.3%  88.4%  12.4MiB                   And 25902 smaller methods. Use -n N to show more.
47.9% 100.0%  14.0MiB                   .text section size, the file size is 29.2MiB

[prek-ci-bot]

⚡️ Hyperfine Benchmarks

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

Environment

• OS: Linux 6.17.0-1020-azure
• CPU: 4 cores
• prek version: prek 0.4.10+30 (4cc5bb2 2026-07-24)
• Rust version: rustc 1.97.1 (8bab26f4f 2026-07-14)
• 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	2.2	2.8	1.02 ± 0.05
prek-head --version	2.2 ± 0.1	2.1	2.4	1.00

prek list

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base list	9.6 ± 0.2	9.3	10.6	1.03 ± 0.03
prek-head list	9.4 ± 0.1	9.1	9.9	1.00

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base validate-config .pre-commit-config.yaml	3.5 ± 0.1	3.3	3.9	1.08 ± 0.07
prek-head validate-config .pre-commit-config.yaml	3.2 ± 0.2	3.0	4.5	1.00

prek sample-config

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base sample-config	2.6 ± 0.1	2.5	2.9	1.08 ± 0.03
prek-head sample-config	2.4 ± 0.0	2.3	2.5	1.00

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	67.8 ± 1.2	66.5	70.0	1.01 ± 0.02
prek-head run --all-files	67.1 ± 0.9	65.5	68.5	1.00

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --all-files	67.5 ± 1.2	65.1	69.6	1.00 ± 0.03
prek-head run --all-files	67.3 ± 1.3	65.5	70.9	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	66.8 ± 1.0	64.3	68.5	1.00
prek-head run --all-files	67.2 ± 1.0	65.7	70.0	1.01 ± 0.02

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	20.5 ± 0.7	19.7	23.4	1.01 ± 0.04
prek-head run trailing-whitespace --all-files	20.2 ± 0.5	19.5	21.7	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	19.6 ± 0.4	19.0	20.6	1.01 ± 0.03
prek-head run end-of-file-fixer --all-files	19.4 ± 0.3	18.7	20.2	1.00

prek run check-json --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-json --all-files	8.2 ± 0.3	7.8	8.9	1.05 ± 0.05
prek-head run check-json --all-files	7.8 ± 0.3	7.4	8.4	1.00

prek run check-yaml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-yaml --all-files	7.8 ± 0.1	7.6	8.1	1.04 ± 0.02
prek-head run check-yaml --all-files	7.5 ± 0.1	7.2	7.8	1.00

prek run check-toml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-toml --all-files	8.6 ± 1.4	7.5	12.4	1.13 ± 0.18
prek-head run check-toml --all-files	7.6 ± 0.3	7.2	8.9	1.00

✅ Performance improvement for prek run check-toml --all-files: 11.4100% faster

prek run check-xml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-xml --all-files	7.8 ± 0.4	7.3	8.7	1.04 ± 0.07
prek-head run check-xml --all-files	7.5 ± 0.4	7.1	8.9	1.00

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run detect-private-key --all-files	11.4 ± 0.6	10.5	12.9	1.03 ± 0.08
prek-head run detect-private-key --all-files	11.1 ± 0.6	10.2	13.6	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	18.5 ± 0.7	17.3	19.9	1.00
prek-head run fix-byte-order-marker --all-files	18.8 ± 0.7	17.7	20.2	1.01 ± 0.05

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	4.7 ± 0.1	4.6	4.8	1.02 ± 0.02
prek-head install-hooks	4.6 ± 0.0	4.6	4.7	1.00

prek install-hooks (warm - with cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base install-hooks	4.7 ± 0.1	4.6	4.8	1.03 ± 0.03
prek-head install-hooks	4.6 ± 0.1	4.5	4.7	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	36.7 ± 0.6	36.1	38.1	1.01 ± 0.02
prek-head run	36.3 ± 0.6	35.7	38.0	1.00

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --files '*.json'	8.3 ± 0.1	8.2	8.7	1.04 ± 0.02
prek-head run --files '*.json'	8.0 ± 0.1	7.9	8.2	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	7.1 ± 0.1	7.0	7.3	1.04 ± 0.02
prek-head run --dry-run --all-files	6.8 ± 0.1	6.7	7.0	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	12.2 ± 0.1	12.0	12.4	1.01 ± 0.02
prek-head run check-hooks-apply --all-files	12.2 ± 0.3	11.9	12.7	1.00

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-useless-excludes --all-files	10.9 ± 0.1	10.7	11.2	1.01 ± 0.02
prek-head run check-useless-excludes --all-files	10.7 ± 0.1	10.5	10.9	1.00

prek run identity --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run identity --all-files	10.2 ± 0.1	10.0	10.4	1.03 ± 0.01
prek-head run identity --all-files	9.9 ± 0.1	9.8	10.1	1.00

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