fix: show tag names in `auto-update --freeze` output by deadnews · Pull Request #1855 · j178/prek

deadnews · 2026-03-22T20:57:51Z

Summary

Display rev@sha instead of raw commit SHA in auto-update --freeze console output
Add display_rev() helper to Revision that formats as rev@sha when frozen, plain rev otherwise
Parse # frozen: comments from config files to also show the tag on the "from" side of already-frozen repos
Adjust test snapshot SHA filter to match SHAs after @

codecov · 2026-03-22T21:00:35Z

Codecov Report

❌ Patch coverage is 95.83333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.94%. Comparing base (dbca904) to head (72b515f).

Files with missing lines	Patch %	Lines
crates/prek/src/cli/auto_update.rs	95.83%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1855   +/-   ##
=======================================
  Coverage   91.93%   91.94%           
=======================================
  Files         107      107           
  Lines       21164    21188   +24     
=======================================
+ Hits        19458    19481   +23     
- Misses       1706     1707    +1

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Copilot

Pull request overview

Improves the readability of prek auto-update --freeze by printing the tag name alongside the frozen commit SHA (as rev@sha) in console output, and updates snapshots/filters to match the new format.

Changes:

Add a Revision::display_rev() helper to format frozen revisions as rev@sha.
Update auto-update console output to use the formatted revision when reporting updates.
Adjust auto-update --freeze test snapshots and SHA filtering regex to match SHAs after @.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
crates/prek/src/cli/auto_update.rs	Formats the updated revision in `auto-update` output as `rev@sha` when freezing.
crates/prek/tests/auto_update.rs	Updates snapshot expectations and SHA filter regex for the new output format.

crates/prek/src/cli/auto_update.rs

prek-ci-bot · 2026-03-22T21:05:32Z

📦 Cargo Bloat Comparison

Binary size change: +0.00% (25.0 MiB → 25.0 MiB)

Expand for cargo-bloat output

Head Branch Results

 File  .text     Size             Crate Name
 1.3%   2.7% 332.0KiB        aws_lc_sys aws_lc_0_39_0_aes_gcm_encrypt_avx512
 1.3%   2.7% 332.0KiB        aws_lc_sys aws_lc_0_39_0_aes_gcm_decrypt_avx512
 0.3%   0.7%  81.3KiB              prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.6%  74.9KiB              prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.6%  72.6KiB             prek? <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.2%   0.5%  56.9KiB              prek prek::languages::<impl prek::config::Language>::install::{{closure}}
 0.2%   0.4%  51.0KiB annotate_snippets annotate_snippets::renderer::render::render
 0.2%   0.4%  47.4KiB              prek prek::run::{{closure}}
 0.2%   0.3%  42.0KiB              prek prek::cli::run::run::run::{{closure}}
 0.1%   0.3%  32.0KiB             prek? <prek::cli::RunArgs as clap_builder::derive::Args>::augment_args
 0.1%   0.2%  28.0KiB        aws_lc_sys aws_lc_0_39_0_edwards25519_scalarmuldouble_alt
 0.1%   0.2%  27.8KiB      serde_saphyr saphyr_parser_bw::scanner::Scanner<T>::fetch_more_tokens
 0.1%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_39_0_edwards25519_scalarmuldouble
 0.1%   0.2%  25.8KiB              prek prek::cli::try_repo::try_repo::{{closure}}
 0.1%   0.2%  25.4KiB             prek? <prek::config::_::<impl serde_core::de::Deserialize for prek::config::Config>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map
 0.1%   0.2%  24.4KiB               std core::ptr::drop_in_place<prek::languages::<impl prek::config::Language>::install::{{closure}}>
 0.1%   0.2%  22.9KiB              prek prek::hooks::meta_hooks::MetaHooks::run::{{closure}}
 0.1%   0.2%  22.4KiB      serde_saphyr saphyr_parser_bw::scanner::Scanner<T>::fetch_more_tokens
 0.1%   0.2%  22.3KiB         [Unknown] Lp384_montjscalarmul_alt_p384_montjadd
 0.1%   0.2%  21.5KiB              prek prek::workspace::Project::init_hooks::{{closure}}
41.4%  86.0%  10.3MiB                   And 23408 smaller methods. Use -n N to show more.
48.1% 100.0%  12.0MiB                   .text section size, the file size is 25.0MiB

Base Branch Results

 File  .text     Size             Crate Name
 1.3%   2.7% 332.0KiB        aws_lc_sys aws_lc_0_39_0_aes_gcm_encrypt_avx512
 1.3%   2.7% 332.0KiB        aws_lc_sys aws_lc_0_39_0_aes_gcm_decrypt_avx512
 0.3%   0.7%  81.3KiB              prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.6%  74.8KiB              prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.6%  69.1KiB             prek? <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.2%   0.5%  56.9KiB              prek prek::languages::<impl prek::config::Language>::install::{{closure}}
 0.2%   0.4%  51.0KiB annotate_snippets annotate_snippets::renderer::render::render
 0.2%   0.4%  47.1KiB              prek prek::run::{{closure}}
 0.2%   0.3%  41.8KiB              prek prek::cli::run::run::run::{{closure}}
 0.1%   0.3%  32.0KiB             prek? <prek::cli::RunArgs as clap_builder::derive::Args>::augment_args
 0.1%   0.2%  28.0KiB        aws_lc_sys aws_lc_0_39_0_edwards25519_scalarmuldouble_alt
 0.1%   0.2%  27.8KiB      serde_saphyr saphyr_parser_bw::scanner::Scanner<T>::fetch_more_tokens
 0.1%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_39_0_edwards25519_scalarmuldouble
 0.1%   0.2%  26.2KiB              prek prek::cli::try_repo::try_repo::{{closure}}
 0.1%   0.2%  25.4KiB             prek? <prek::config::_::<impl serde_core::de::Deserialize for prek::config::Config>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map
 0.1%   0.2%  24.4KiB               std core::ptr::drop_in_place<prek::languages::<impl prek::config::Language>::install::{{closure}}>
 0.1%   0.2%  23.1KiB              prek prek::hooks::meta_hooks::MetaHooks::run::{{closure}}
 0.1%   0.2%  22.4KiB      serde_saphyr saphyr_parser_bw::scanner::Scanner<T>::fetch_more_tokens
 0.1%   0.2%  22.3KiB         [Unknown] Lp384_montjscalarmul_alt_p384_montjadd
 0.1%   0.2%  21.8KiB              prek prek::main
41.4%  86.0%  10.3MiB                   And 23388 smaller methods. Use -n N to show more.
48.1% 100.0%  12.0MiB                   .text section size, the file size is 25.0MiB

prek-ci-bot · 2026-03-22T21:05:33Z

⚡️ Hyperfine Benchmarks

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

Environment

OS: Linux 6.14.0-1017-azure
CPU: 4 cores
prek version: prek 0.3.6+29 (055018b 2026-03-23)
Rust version: rustc 1.94.0 (4a4ef493e 2026-03-02)
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`	2.5 ± 0.1	2.3	3.4	1.08 ± 0.07
`prek-head --version`	2.3 ± 0.1	2.2	2.6	1.00

`prek list`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base list`	9.0 ± 0.1	8.8	9.4	1.00
`prek-head list`	9.0 ± 0.2	8.8	10.1	1.00 ± 0.02

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base validate-config .pre-commit-config.yaml`	3.3 ± 0.1	3.1	3.7	1.03 ± 0.04
`prek-head validate-config .pre-commit-config.yaml`	3.2 ± 0.0	3.1	3.2	1.00

`prek sample-config`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base sample-config`	2.6 ± 0.0	2.5	2.7	1.00 ± 0.02
`prek-head sample-config`	2.6 ± 0.0	2.5	2.7	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`	155.1 ± 2.3	152.0	159.6	1.00
`prek-head run --all-files`	156.0 ± 2.4	153.1	160.0	1.01 ± 0.02

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run --all-files`	156.0 ± 2.2	152.8	162.2	1.00
`prek-head run --all-files`	157.5 ± 4.3	151.8	167.8	1.01 ± 0.03

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`	155.5 ± 2.7	151.4	163.2	1.00
`prek-head run --all-files`	156.9 ± 11.2	150.8	231.6	1.01 ± 0.07

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`	22.0 ± 0.3	21.2	22.5	1.01 ± 0.02
`prek-head run trailing-whitespace --all-files`	21.7 ± 0.4	20.8	22.7	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`	28.7 ± 2.6	25.3	38.1	1.00
`prek-head run end-of-file-fixer --all-files`	28.8 ± 2.1	25.6	31.9	1.00 ± 0.12

`prek run check-json --all-files`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run check-json --all-files`	13.0 ± 0.4	12.3	13.7	1.05 ± 0.04
`prek-head run check-json --all-files`	12.4 ± 0.2	11.9	12.9	1.00

`prek run check-yaml --all-files`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run check-yaml --all-files`	12.2 ± 0.2	11.9	12.6	1.00 ± 0.02
`prek-head run check-yaml --all-files`	12.2 ± 0.2	11.9	12.8	1.00

`prek run check-toml --all-files`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run check-toml --all-files`	12.5 ± 0.4	11.8	13.3	1.00 ± 0.04
`prek-head run check-toml --all-files`	12.5 ± 0.4	11.9	13.5	1.00

`prek run check-xml --all-files`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run check-xml --all-files`	12.6 ± 0.3	12.0	13.1	1.01 ± 0.04
`prek-head run check-xml --all-files`	12.5 ± 0.3	11.9	13.3	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`	18.5 ± 1.7	16.4	25.0	1.00 ± 0.11
`prek-head run detect-private-key --all-files`	18.5 ± 1.1	16.8	20.7	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`	24.4 ± 1.4	21.2	26.8	1.00
`prek-head run fix-byte-order-marker --all-files`	24.8 ± 1.7	21.6	27.4	1.02 ± 0.09

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`	5.0 ± 0.1	4.9	5.0	1.01 ± 0.02
`prek-head install-hooks`	4.9 ± 0.1	4.8	5.1	1.00

`prek install-hooks (warm - with cache)`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base install-hooks`	4.9 ± 0.1	4.8	5.0	1.01 ± 0.03
`prek-head install-hooks`	4.8 ± 0.1	4.8	4.9	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`	53.8 ± 1.2	52.1	57.1	1.00
`prek-head run`	54.0 ± 2.6	51.9	63.9	1.00 ± 0.05

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

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run --files '*.json'`	9.3 ± 0.1	9.1	9.5	1.00 ± 0.02
`prek-head run --files '*.json'`	9.3 ± 0.1	9.0	9.6	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`	14.3 ± 0.4	13.9	15.9	1.00
`prek-head run --dry-run --all-files`	14.3 ± 0.2	13.9	14.7	1.00 ± 0.03

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`	13.4 ± 1.1	12.7	16.7	1.05 ± 0.09
`prek-head run check-hooks-apply --all-files`	12.8 ± 0.1	12.6	12.9	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`	12.9 ± 0.1	12.6	13.1	1.00 ± 0.02
`prek-head run check-useless-excludes --all-files`	12.8 ± 0.2	12.6	13.5	1.00

`prek run identity --all-files`

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`prek-base run identity --all-files`	11.4 ± 0.1	11.2	11.7	1.01 ± 0.02
`prek-head run identity --all-files`	11.3 ± 0.2	11.1	11.6	1.00

chatgpt-codex-connector

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crates/prek/src/cli/auto_update.rs

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chatgpt-codex-connector · 2026-03-22T21:44:21Z

crates/prek/src/cli/auto_update.rs

+        };
+        for line in content.lines() {
+            if let Some(caps) = rev_re.captures(line) {
+                map.insert(caps[1].to_string(), caps[2].to_string());


Key frozen-rev cache by repo as well as SHA

The new frozen-comment cache is keyed only by commit SHA, but auto_update later looks up the display tag using just remote_repo.rev; this means entries from different repos/projects that share the same SHA will overwrite each other and at least one update line will show the wrong tag@sha. This can happen with forks/mirrors or multiple configs in one workspace that pin identical commits with different tag names, so the output is now nondeterministic/incorrect for those cases.

Useful? React with 👍 / 👎.

The frozen comment line doesn't contain the repo URL, I'd need to also parse the repo: line above it (and differently for TOML sections). That's more parsing complexity than the edge case warrants: two different repos pinned to the same SHA with different tag names is extremely unlikely, and even then the worst case is a slightly wrong tag in a display-only message.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

crates/prek/src/cli/auto_update.rs

Copilot · 2026-03-22T21:45:18Z

crates/prek/src/cli/auto_update.rs

    let workspace = Workspace::discover(store, workspace_root, config, Some(&selectors), true)?;

+    // Parse `# frozen: <rev>` comments from config files to display old revs
+    let frozen_revs = parse_frozen_comments(&workspace);


parse_frozen_comments() is called unconditionally, and it re-reads every project config file from disk just to improve display output. In large workspaces this adds avoidable I/O on every auto-update run; consider only parsing frozen comments when needed (e.g., when --freeze is set, or when any configured rev looks like a 40-hex SHA).

Suggested change

let frozen_revs = parse_frozen_comments(&workspace);

let frozen_revs = if freeze {

parse_frozen_comments(&workspace)

} else {

Default::default()

};

Frozen comments exist from previous runs, needed even without --freeze.

Copilot · 2026-03-22T21:45:19Z

crates/prek/src/cli/auto_update.rs

+fn parse_frozen_comments(workspace: &Workspace) -> FxHashMap<String, String> {
+    let rev_re = regex!(r#"rev\s*[:=]\s*['"]?([a-f0-9]{40})['"]?\s*#\s*frozen:\s*(\S+)"#);
+    let mut map = FxHashMap::default();
+
+    for project in workspace.projects() {
+        let Ok(content) = fs_err::read_to_string(project.config_file()) else {
+            continue;
+        };
+        for line in content.lines() {
+            if let Some(caps) = rev_re.captures(line) {
+                map.insert(caps[1].to_string(), caps[2].to_string());


parse_frozen_comments() uses fs_err::read_to_string (blocking I/O) inside the async auto_update flow. To avoid blocking the Tokio runtime, consider making this async (using fs_err::tokio::read_to_string) or using tokio::task::spawn_blocking for the file reads.

Suggested change

fn parse_frozen_comments(workspace: &Workspace) -> FxHashMap<String, String> {

let rev_re = regex!(r#"rev\s*[:=]\s*['"]?([a-f0-9]{40})['"]?\s*#\s*frozen:\s*(\S+)"#);

let mut map = FxHashMap::default();

for project in workspace.projects() {

let Ok(content) = fs_err::read_to_string(project.config_file()) else {

continue;

};

for line in content.lines() {

if let Some(caps) = rev_re.captures(line) {

map.insert(caps[1].to_string(), caps[2].to_string());

async fn parse_frozen_comments(workspace: &Workspace) -> FxHashMap<String, String> {

let rev_re = regex!(r#"rev\s*[:=]\s*['"]?([a-f0-9]{40})['"]?\s*#\s*frozen:\s*(\S+)"#);

let mut map = FxHashMap::default();

for project in workspace.projects() {

// Ignore unreadable config files, matching the original behavior.

if let Ok(content) = fs_err::tokio::read_to_string(project.config_file()).await {

for line in content.lines() {

if let Some(caps) = rev_re.captures(line) {

map.insert(caps[1].to_string(), caps[2].to_string());

}

Blocking fs_err::read_to_string is used throughout the codebase for config files. These are tiny files already in page cache?

Copilot AI review requested due to automatic review settings March 22, 2026 20:57

deadnews requested a review from j178 as a code owner March 22, 2026 20:57

Copilot started reviewing on behalf of deadnews March 22, 2026 20:58 View session

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crates/prek/src/cli/auto_update.rs Show resolved Hide resolved

deadnews force-pushed the master branch from aa61d2b to 4a1690a Compare March 22, 2026 21:34

chatgpt-codex-connector bot reviewed Mar 22, 2026

View reviewed changes

crates/prek/src/cli/auto_update.rs Outdated Show resolved Hide resolved

deadnews force-pushed the master branch from 4a1690a to 7c0ebbf Compare March 22, 2026 21:41

Copilot AI review requested due to automatic review settings March 22, 2026 21:41

Copilot started reviewing on behalf of deadnews March 22, 2026 21:41 View session

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fix: show tag names in auto-update --freeze output

72b515f

deadnews force-pushed the master branch from 7c0ebbf to 72b515f Compare March 22, 2026 21:53

-    let frozen_revs = parse_frozen_comments(&workspace);
+    let frozen_revs = if freeze {
+        parse_frozen_comments(&workspace)
+    } else {
+        Default::default()
+    };

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Pull request overview

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📦 Cargo Bloat Comparison

Head Branch Results

Base Branch Results

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⚡️ Hyperfine Benchmarks

prek --version

prek list

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

prek sample-config

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

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

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

prek run trailing-whitespace --all-files

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

prek run check-json --all-files

prek run check-yaml --all-files

prek run check-toml --all-files

prek run check-xml --all-files

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

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

prek install-hooks (cold - no cache)

prek install-hooks (warm - with cache)

prek run (staged files only)

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

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

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

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

prek run identity --all-files

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Pull request overview

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Copilot AI Mar 22, 2026

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deadnews Mar 22, 2026

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Copilot AI Mar 22, 2026

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deadnews Mar 22, 2026

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deadnews commented Mar 22, 2026 •

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codecov bot commented Mar 22, 2026 •

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prek-ci-bot bot commented Mar 22, 2026 •

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prek-ci-bot bot commented Mar 22, 2026 •

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`prek --version`

`prek list`

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

`prek sample-config`

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

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

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

`prek run trailing-whitespace --all-files`

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

`prek run check-json --all-files`

`prek run check-yaml --all-files`

`prek run check-toml --all-files`

`prek run check-xml --all-files`

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

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

`prek install-hooks (cold - no cache)`

`prek install-hooks (warm - with cache)`

`prek run (staged files only)`

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

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

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

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

`prek run identity --all-files`