Remove hook marker schema 0

[j178]

Drops support for schema 0 hook environment markers.

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Replace unwrap_err with explicit result matching

This test introduces .unwrap_err() even though the repository guidance explicitly asks contributors to avoid unwraps and encode the failure path explicitly. Match on the deserialization result and assert on the Err value instead, so the test follows the documented control-flow convention.

AGENTS.md reference: AGENTS.md:L10-L12

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.99%. Comparing base (e804c97) to head (c5b8e32).

Additional details and impacted files

@@                     Coverage Diff                     @@
##           drop-tracking-bootstrap    #2622      +/-   ##
===========================================================
+ Coverage                    93.68%   93.99%   +0.30%     
===========================================================
  Files                          140      140              
  Lines                        29534    29460      -74     
===========================================================
+ Hits                         27670    27691      +21     
+ Misses                        1864     1769      -95     

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[prek-ci-bot]

📦 Cargo Bloat Comparison

.text size change: +0.00% (12.5 MiB → 12.5 MiB)

Expand for cargo-bloat output

Head Branch Results

File  .text     Size             Crate Name
0.1%   2.6% 332.0KiB        aws_lc_sys aws_lc_0_44_0_aes_gcm_encrypt_avx512
0.1%   2.6% 332.0KiB        aws_lc_sys aws_lc_0_44_0_aes_gcm_decrypt_avx512
0.0%   0.9% 113.7KiB              prek <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
0.0%   0.4%  50.6KiB              prek <<prek::config::hook::HookWire 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>
0.0%   0.4%  48.7KiB annotate_snippets annotate_snippets::renderer::render::render
0.0%   0.4%  47.7KiB              prek prek::run::{closure#0}
0.0%   0.3%  44.1KiB              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>
0.0%   0.3%  37.1KiB              prek <prek::cli::RunOptions as clap_builder::derive::Args>::augment_args
0.0%   0.3%  33.0KiB              prek prek::cli::run::run::run::{closure#0}
0.0%   0.2%  28.6KiB      serde_saphyr <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
0.0%   0.2%  28.4KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  28.0KiB        aws_lc_sys aws_lc_0_44_0_edwards25519_scalarmuldouble_alt
0.0%   0.2%  27.8KiB      serde_saphyr <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
0.0%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_44_0_edwards25519_scalarmuldouble
0.0%   0.2%  27.3KiB              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%  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}
0.0%   0.2%  27.0KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  26.9KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  26.9KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
4.2%  86.7%  10.8MiB                   And 20303 smaller methods. Use -n N to show more.
4.9% 100.0%  12.5MiB                   .text section size, the file size is 256.8MiB

Base Branch Results

File  .text     Size             Crate Name
0.1%   2.6% 332.0KiB        aws_lc_sys aws_lc_0_44_0_aes_gcm_encrypt_avx512
0.1%   2.6% 332.0KiB        aws_lc_sys aws_lc_0_44_0_aes_gcm_decrypt_avx512
0.0%   0.9% 113.7KiB              prek <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
0.0%   0.4%  51.4KiB              prek <<prek::config::hook::HookWire 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>
0.0%   0.4%  48.7KiB annotate_snippets annotate_snippets::renderer::render::render
0.0%   0.3%  44.6KiB              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>
0.0%   0.3%  44.5KiB              prek prek::run::{closure#0}
0.0%   0.3%  37.1KiB              prek <prek::cli::RunOptions as clap_builder::derive::Args>::augment_args
0.0%   0.3%  33.8KiB              prek <prek::languages::rust::rust::Rust as prek::languages::LanguageBackend>::install::{closure#0}
0.0%   0.3%  33.6KiB              prek prek::cli::run::run::run::{closure#0}
0.0%   0.2%  28.6KiB      serde_saphyr <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
0.0%   0.2%  28.4KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  28.0KiB        aws_lc_sys aws_lc_0_44_0_edwards25519_scalarmuldouble_alt
0.0%   0.2%  27.8KiB      serde_saphyr <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
0.0%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_44_0_edwards25519_scalarmuldouble
0.0%   0.2%  27.4KiB              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%  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}
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}
4.2%  86.6%  10.8MiB                   And 20255 smaller methods. Use -n N to show more.
4.9% 100.0%  12.5MiB                   .text section size, the file size is 256.6MiB

[prek-ci-bot]

⚡️ Hyperfine Benchmarks

Summary: 5 regressions, 10 improvements above the 10% threshold.

Environment

• OS: Linux 6.17.0-1022-azure
• CPU: 4 cores
• prek version: prek 0.4.14+33 (4c0cb87 2026-08-26)
• Rust version: rustc 1.98.0 (88d9e12ae 2026-08-18)
• 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	1.8 ± 0.2	1.6	2.6	1.07 ± 0.13
prek-head --version	1.7 ± 0.1	1.5	1.9	1.00

prek list

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base list	13.8 ± 24.5	5.9	146.5	1.44 ± 3.29
prek-head list	9.6 ± 13.6	5.9	107.1	1.00

✅ Performance improvement for prek list: 30.6300% faster

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	4.8 ± 13.2	1.7	82.8	1.00
prek-head sample-config	5.9 ± 13.2	1.7	75.4	1.22 ± 4.28

⚠️ Warning: Performance regression for prek sample-config: 21.6400% slower

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	25.0 ± 1.3	23.1	27.2	1.00
prek-head run --all-files	27.2 ± 0.8	26.3	28.7	1.09 ± 0.06

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --all-files	31.5 ± 26.0	23.6	141.9	1.00
prek-head run --all-files	32.1 ± 25.2	22.6	126.6	1.02 ± 1.16

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	28.3 ± 21.2	22.5	174.5	1.01 ± 1.08
prek-head run --all-files	27.9 ± 21.1	22.4	174.0	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 ± 0.4	7.6	9.2	1.00 ± 0.10
prek-head run trailing-whitespace --all-files	8.3 ± 0.7	7.6	10.1	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	7.2 ± 0.5	6.5	8.9	1.00
prek-head run end-of-file-fixer --all-files	7.4 ± 1.9	6.5	16.7	1.03 ± 0.27

prek run check-json --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-json --all-files	10.0 ± 14.1	4.7	76.9	1.00
prek-head run check-json --all-files	13.9 ± 32.1	4.7	132.9	1.39 ± 3.77

⚠️ Warning: Performance regression for prek run check-json --all-files: 39.2500% slower

prek run check-yaml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-yaml --all-files	6.5 ± 5.4	4.8	29.1	1.00
prek-head run check-yaml --all-files	15.9 ± 31.4	4.7	129.4	2.45 ± 5.24

⚠️ Warning: Performance regression for prek run check-yaml --all-files: 144.9600% slower

prek run check-toml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-toml --all-files	13.1 ± 27.4	4.7	139.4	1.73 ± 4.01
prek-head run check-toml --all-files	7.6 ± 7.7	4.8	30.8	1.00

✅ Performance improvement for prek run check-toml --all-files: 42.2000% faster

prek run check-xml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-xml --all-files	15.2 ± 35.6	4.6	163.4	1.41 ± 4.50
prek-head run check-xml --all-files	10.8 ± 23.5	4.6	130.1	1.00

✅ Performance improvement for prek run check-xml --all-files: 28.8700% faster

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run detect-private-key --all-files	12.1 ± 15.6	6.5	82.0	1.26 ± 2.10
prek-head run detect-private-key --all-files	9.6 ± 10.0	6.4	54.4	1.00

✅ Performance improvement for prek run detect-private-key --all-files: 20.5900% faster

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	16.9 ± 25.3	8.7	126.4	1.19 ± 2.48
prek-head run fix-byte-order-marker --all-files	14.2 ± 20.5	8.5	120.5	1.00

✅ Performance improvement for prek run fix-byte-order-marker --all-files: 16.0300% faster

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	3.1 ± 0.1	3.0	3.3	1.03 ± 0.04
prek-head install-hooks	3.0 ± 0.0	3.0	3.1	1.00

prek install-hooks (warm - with cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base install-hooks	3.6 ± 1.1	3.1	5.6	1.16 ± 0.36
prek-head install-hooks	3.1 ± 0.1	3.0	3.2	1.00

✅ Performance improvement for prek install-hooks (warm - with cache): 14.1400% faster

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	21.8 ± 16.7	14.1	80.6	1.00
prek-head run	28.5 ± 33.9	14.3	157.2	1.31 ± 1.85

⚠️ Warning: Performance regression for prek run (staged files only): 30.8900% slower

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --files '*.json'	13.5 ± 19.0	3.4	67.3	1.60 ± 3.21
prek-head run --files '*.json'	8.4 ± 12.0	3.3	46.0	1.00

✅ Performance improvement for prek run --files '*.json' (specific file type): 37.5100% faster

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	18.3 ± 47.1	4.4	215.3	2.51 ± 7.08
prek-head run --dry-run --all-files	7.3 ± 8.5	4.9	43.0	1.00

✅ Performance improvement for prek run --dry-run --all-files (measures init overhead): 60.1100% faster

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	11.3 ± 16.7	5.1	62.9	1.32 ± 2.69
prek-head run check-hooks-apply --all-files	8.6 ± 12.0	5.2	51.9	1.00

✅ Performance improvement for prek run check-hooks-apply --all-files: 24.3800% faster

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-useless-excludes --all-files	7.0 ± 6.9	5.0	32.0	1.00
prek-head run check-useless-excludes --all-files	9.7 ± 11.5	5.1	46.3	1.39 ± 2.13

⚠️ Warning: Performance regression for prek run check-useless-excludes --all-files: 38.6200% slower

prek run identity --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run identity --all-files	41.7 ± 53.4	4.5	129.1	5.46 ± 9.15
prek-head run identity --all-files	7.6 ± 8.3	4.5	36.8	1.00

✅ Performance improvement for prek run identity --all-files: 81.6800% faster