Add check-dco-signoff builtin hook

[ebuildy]

Add a build-in checker: DCO sign off .

this is an addition of the issue #2725 and the PR #2725 (signed commit).

Usage

[[repos]]
repo = "builtin"
hooks = [
  { id = "check-dco-signoff" },
]

Example of error:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.36%. Comparing base (d8b4548) to head (630b27a).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2736      +/-   ##
==========================================
+ Coverage   94.33%   94.36%   +0.03%     
==========================================
  Files         143      144       +1     
  Lines       30865    31013     +148     
==========================================
+ Hits        29117    29266     +149     
+ Misses       1748     1747       -1     

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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%  40.8KiB              prek <prek::cli::RunOptions as clap_builder::derive::Args>::augment_args
0.0%   0.3%  37.9KiB              prek prek::run::{closure#0}
0.0%   0.2%  32.9KiB              prek <prek::languages::rust::rust::Rust as prek::languages::LanguageBackend>::install::{closure#0}
0.0%   0.2%  29.5KiB      serde_saphyr <granit_parser::scanner::Scanner<granit_parser::input::str::StrInput>>::fetch_more_tokens
0.0%   0.2%  29.0KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  28.0KiB              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::cli::run::run::run::{closure#0}
0.0%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_45_0_edwards25519_scalarmuldouble
0.0%   0.2%  27.4KiB              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}
0.0%   0.2%  27.1KiB              prek prek::cli::hook_impl::hook_impl::{closure#0}
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}
4.1%  87.2%  11.3MiB                   And 20845 smaller methods. Use -n N to show more.
4.7% 100.0%  12.9MiB                   .text section size, the file size is 277.9MiB

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%  35.1KiB              prek prek::run::{closure#0}
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%  28.0KiB              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%  27.5KiB        aws_lc_sys aws_lc_0_45_0_edwards25519_scalarmuldouble
0.0%   0.2%  27.4KiB              prek prek::archive::unpack::<fs_err::tokio::file::File, &std::path::PathBuf>::{closure#0}
0.0%   0.2%  27.2KiB              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}
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%  26.4KiB              prek <prek::languages::ruby::installer::RubyInstaller>::install::{closure#0}
4.1%  87.3%  11.3MiB                   And 20867 smaller methods. Use -n N to show more.
4.7% 100.0%  12.9MiB                   .text section size, the file size is 277.0MiB

[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 0.5.5+13 (039e460 2026-10-09)
• 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	2.2 ± 0.1	2.1	3.1	1.02 ± 0.07
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	9.1 ± 0.1	8.9	9.7	1.00 ± 0.02
prek-head list	9.1 ± 0.1	8.9	9.8	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 ± 0.1	2.4	2.7	1.01 ± 0.04
prek-head sample-config	2.5 ± 0.1	2.4	3.0	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	17.1 ± 0.5	16.5	18.5	1.01 ± 0.04
prek-head run --all-files	17.0 ± 0.3	16.5	17.6	1.00

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --all-files	16.9 ± 0.2	16.5	17.3	1.00
prek-head run --all-files	17.0 ± 0.3	16.5	17.5	1.01 ± 0.02

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	17.3 ± 0.4	16.5	18.4	1.00 ± 0.03
prek-head run --all-files	17.2 ± 0.4	16.6	18.0	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	8.5 ± 0.2	8.1	9.2	1.00
prek-head run trailing-whitespace --all-files	8.5 ± 0.3	8.3	10.0	1.00 ± 0.04

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	7.8 ± 0.1	7.5	8.0	1.01 ± 0.02
prek-head run end-of-file-fixer --all-files	7.7 ± 0.1	7.6	7.9	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 ± 0.1	6.6	6.9	1.00
prek-head run check-json --all-files	6.7 ± 0.1	6.6	7.0	1.01 ± 0.02

prek run check-yaml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-yaml --all-files	7.0 ± 0.1	6.8	7.3	1.00
prek-head run check-yaml --all-files	7.1 ± 0.2	6.9	7.7	1.02 ± 0.03

prek run check-toml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-toml --all-files	6.8 ± 0.0	6.7	6.9	1.00
prek-head run check-toml --all-files	6.9 ± 0.2	6.8	7.5	1.02 ± 0.03

prek run check-xml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-xml --all-files	6.8 ± 0.1	6.7	7.1	1.01 ± 0.02
prek-head run check-xml --all-files	6.8 ± 0.1	6.7	6.9	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	7.2 ± 0.1	7.1	7.4	1.00
prek-head run detect-private-key --all-files	7.3 ± 0.1	7.1	7.6	1.02 ± 0.02

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	7.7 ± 0.2	7.3	8.3	1.00
prek-head run fix-byte-order-marker --all-files	7.8 ± 0.2	7.5	8.4	1.01 ± 0.04

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	4.8 ± 0.2	4.6	5.0	1.04 ± 0.04
prek-head install-hooks	4.6 ± 0.1	4.5	4.7	1.00

prek install-hooks (warm - with cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base install-hooks	4.6 ± 0.1	4.6	4.7	1.00
prek-head install-hooks	4.7 ± 0.1	4.6	5.0	1.02 ± 0.04

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	11.0 ± 0.3	10.6	11.6	1.05 ± 0.04
prek-head run	10.4 ± 0.3	10.0	11.0	1.00

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --files '*.json'	5.3 ± 0.1	5.2	5.5	1.02 ± 0.02
prek-head run --files '*.json'	5.2 ± 0.1	5.0	5.4	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	7.7 ± 0.4	7.0	8.3	1.09 ± 0.05
prek-head run --dry-run --all-files	7.1 ± 0.1	6.9	7.4	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	8.1 ± 0.1	7.9	8.5	1.00
prek-head run check-hooks-apply --all-files	8.2 ± 0.2	8.0	8.8	1.02 ± 0.03

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-useless-excludes --all-files	8.1 ± 0.1	7.9	8.3	1.00
prek-head run check-useless-excludes --all-files	8.3 ± 0.5	8.0	10.2	1.02 ± 0.07

prek run identity --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run identity --all-files	7.0 ± 0.1	6.8	7.3	1.03 ± 0.02
prek-head run identity --all-files	6.9 ± 0.1	6.8	7.0	1.00