fix(cli): reject unknown --timezone values by ravsau · Pull Request #1732 · ccusage/ccusage

ravsau · 2026-09-15T23:49:14Z

parse_tz swallowed the jiff error, so an unknown --timezone value (or a config timezone) silently fell back to the system timezone and could group usage under the wrong date, with no error and no warning.

The check runs once in the ccusage binary, right after parsing and before last_window::resolve, which already consumes the timezone. It lives there rather than in the parser because ccusage-cli-parser deliberately depends only on ccusage-cli and has no timezone library. One check covers the shared --timezone flag, the statusline --timezone flag, and a config timezone, because all of them land on the parsed args. It only inspects the timezone the selected command will use, so ccusage daily --config bad.json -z UTC and ccusage -z Not/AZone daily -z UTC both still run.

ccusage-core gains is_valid_timezone. local, which the configuration guide recommends for the system timezone, stays accepted and keeps its current behavior.

Invalid value for --timezone 'Not/AZone'. Expected an IANA timezone name such as UTC or America/New_York.
Run 'ccusage --help' for usage.

Tests cover unified, claude daily, claude session, codex monthly, blocks, and statusline rejections; UTC, Asia/Tokyo, local, and no timezone acceptance; root-vs-command precedence; and a real config file whose bad timezone is rejected and then overridden by a flag before or after the command. The CLI options guide gets one sentence.

Validation: cargo test -p ccusage -p ccusage-core, cargo clippy --all-targets -D warnings, cargo fmt --check, and the release binary end to end for flag, statusline, config, override, and local cases.

Summary by cubic

Rejects unknown --timezone values instead of silently falling back to the system timezone, which could group usage under the wrong date. Fixes #1730. Validation now skips on hosts with no zoneinfo database, preserving the old fallback rather than turning it into a hard failure.

Validates the timezone the selected command will use, after config and flags merge, so overrides still work.
Accepts local as the documented system timezone alias; skips validation entirely when the zoneinfo database is empty.
Adds is_valid_timezone to ccusage-core and a validation step in the ccusage binary.
Updates the CLI options guide and the error message to mention local, the new rejection behavior, and the no-zoneinfo fallback.

^{Written for commit ef24c8b. Summary will update on new commits.}

Summary by CodeRabbit

New Features
- Added timezone validation for command-line options and configuration files.
- Timezone values must be local or a valid IANA timezone name, including command-specific overrides.
- Invalid timezone names now produce an error and non-zero exit status instead of silently falling back to the system timezone.
- On systems without a zoneinfo database, timezone validation remains compatible with the existing system-timezone fallback.
Documentation
- Updated CLI documentation to describe accepted timezone formats and validation behavior.

parse_tz swallowed the jiff error, so an unknown name such as a typo in America/New_York silently fell back to the system timezone and could group usage under the wrong date, with no error and no warning. The check runs once in the binary after config and flags are merged, next to the existing --last resolver, because the parser crate deliberately has no timezone dependency. It covers the shared flag, the statusline flag, and a config timezone, and only inspects the value the command will actually use. `local` stays accepted as the documented name for the system timezone.

coderabbitai · 2026-09-15T23:50:13Z

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📒 Files selected for processing (2)

docs/guide/cli-options.md
rust/crates/ccusage-core/src/date_utils.rs

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docs/guide/cli-options.md

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📝 Walkthrough

Walkthrough

The CLI validates effective timezone values from flags and configuration before resolving report windows. Unknown values return a usage error. The validator handles command precedence and zoneinfo-limited hosts. Documentation describes accepted values.

Changes

Timezone validation

Layer / File(s)	Summary
Timezone validity contract `rust/crates/ccusage-core/src/date_utils.rs`	`is_valid_timezone` accepts `local`, known timezone names, and any value when the zoneinfo database is definitively empty. Tests cover these cases.
CLI validation flow and coverage `rust/crates/ccusage/src/cli.rs`, `rust/crates/ccusage/src/cli/timezone.rs`, `docs/guide/cli-options.md`	The CLI validates the effective timezone after parsing and before `last_window::resolve`. Tests cover invalid values, command precedence, and configuration overrides. Documentation describes the accepted values and fallback behavior without a zoneinfo database.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant CLIParse
  participant TimezoneValidate
  participant IsValidTimezone
  CLIParse->>TimezoneValidate: validate parsed effective timezone
  TimezoneValidate->>IsValidTimezone: check timezone value
  IsValidTimezone-->>TimezoneValidate: return valid or invalid
  TimezoneValidate-->>CLIParse: return success or usage error

Suggested reviewers: ryoppippi

Merge Risk: ⚪ Minimal · up to ef24c

The effective timezone is validated after configuration and flag merging, while the documented no-zoneinfo fallback remains compatible with Jiff's behavior.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 64.71% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 17 functions across 3 files. (1 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: rejecting unknown --timezone values in the CLI and configuration.
Linked Issues check	✅ Passed	The changes satisfy `#1730`. `cli::parse` validates after configuration and flag merging and before timezone resolution. `timezone::effective_timezone` checks only the selected command value, so a valid…
Out of Scope Changes check	✅ Passed	The changes stay within `#1730`. The core helper provides the required timezone check. The CLI integration, tests, and documentation address invalid values, effective-value precedence, accepted values, …

Full details: Docstring Coverage

Explanation

Docstring coverage is 64.71% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 17 functions across 3 files. (1 skipped: 1 unsupported.)

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github-actions · 2026-09-15T23:52:07Z

Pullfrog could not complete the automated PR review. The PR was left open for maintainer review.

pullfrog

✅ No new issues found.

Reviewed changes Reviewed the single-commit fix for unknown --timezone values end to end.

Timezone validation: new cli/timezone.rs checks only the timezone the selected command will use, after config and flags merge, so overrides keep working.
Core helper: is_valid_timezone accepts local as the system-timezone alias and delegates everything else to JiffTimeZone::get.
Binary wiring: cli::parse runs the check before last_window::resolve, exiting with usage text instead of silently falling back to the system zone.
Tests and docs: unit tests cover rejection, acceptance, root-vs-command precedence, and config override; CLI options guide documents the rejection.

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Actionable comments posted: 1

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Inline comments:
In `@rust/crates/ccusage/src/cli/timezone.rs`:
- Around line 12-14: Update the validation error messages in validate and
rejection to state that local is accepted alongside IANA timezone names, while
preserving the existing invalid-value context and examples.

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📒 Files selected for processing (4)

docs/guide/cli-options.md
rust/crates/ccusage-core/src/date_utils.rs
rust/crates/ccusage/src/cli.rs
rust/crates/ccusage/src/cli/timezone.rs

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pullfrog

✅ No new issues found.

Reviewed changes Reviewed the delta since the prior pullfrog review (f82048c1 → ebc680f).

Updated the --timezone rejection message in validate and the test rejection helper to mention 'local' alongside IANA names, matching the already-accepted local behavior and docs.

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pkg-pr-new · 2026-09-16T00:49:07Z

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commit: ebc680f

A host with no zoneinfo at all cannot resolve any name, not even UTC, so the check would turn the old silent fallback into a hard failure. The CI integration tests hit this because they spawn the binary with a cleared environment inside the hermetic sandbox. The validator now only runs when jiff reports a non-empty database, and the empty case is unit-tested with an injected TimeZoneDatabase::none().

ravsau · 2026-09-16T00:59:19Z

The test job failure was ccusage zcode daily --timezone UTC failing with "Invalid value for --timezone 'UTC'". The integration tests spawn the binary with env_clear(), so inside the hermetic sandbox there is no TZDIR and no /usr/share/zoneinfo; jiff's database is then definitively empty and cannot resolve any name, not even UTC. Before this PR that case fell back silently, so the snapshot still matched.

The same situation exists for users on minimal containers without tzdata, so this is a real regression, not just a test-environment one. Pushed ef24c8b: validation now only runs when jiff::tz::db().is_definitively_empty() is false, and the empty-database path is unit-tested with an injected TimeZoneDatabase::none(). Docs note the fallback. Local: cargo test -p ccusage -p ccusage-core and the zcode_cli integration test pass, clippy clean.

cubic-dev-ai

1 issue found across 2 files (changes from recent commits).

Prompt for AI agents (unresolved issues)


Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="rust/crates/ccusage-core/src/date_utils.rs">

<violation number="1" location="rust/crates/ccusage-core/src/date_utils.rs:306">
P3: On hosts with no zoneinfo database, `db.is_definitively_empty()` short-circuits before `db.get(value)`, so `is_valid_timezone` returns true for every value including a typo like `Not/AZone`. `parse_tz` then returns None and the report silently falls back to system time — the exact silent-fallback behavior this PR is meant to reject. The bypass is documented as intentional (needed to keep the hermetic CI sandbox green), but it means the validation is a no-op on minimal containers. Consider at least confirming this trade-off is surfaced to users, since a typo'd `--timezone` will pass validation there.</violation>
</file>

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cubic-dev-ai · 2026-09-16T01:03:33Z

+/// there would turn the old silent fallback into a hard failure, so the check
+/// only runs when there is a database to check against.
+fn is_valid_timezone_in(db: &jiff::tz::TimeZoneDatabase, value: &str) -> bool {
+    value == "local" || db.is_definitively_empty() || db.get(value).is_ok()


P3: On hosts with no zoneinfo database, db.is_definitively_empty() short-circuits before db.get(value), so is_valid_timezone returns true for every value including a typo like Not/AZone. parse_tz then returns None and the report silently falls back to system time — the exact silent-fallback behavior this PR is meant to reject. The bypass is documented as intentional (needed to keep the hermetic CI sandbox green), but it means the validation is a no-op on minimal containers. Consider at least confirming this trade-off is surfaced to users, since a typo'd --timezone will pass validation there.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At rust/crates/ccusage-core/src/date_utils.rs, line 306: <comment>On hosts with no zoneinfo database, `db.is_definitively_empty()` short-circuits before `db.get(value)`, so `is_valid_timezone` returns true for every value including a typo like `Not/AZone`. `parse_tz` then returns None and the report silently falls back to system time — the exact silent-fallback behavior this PR is meant to reject. The bypass is documented as intentional (needed to keep the hermetic CI sandbox green), but it means the validation is a no-op on minimal containers. Consider at least confirming this trade-off is surfaced to users, since a typo'd `--timezone` will pass validation there.</comment> <file context> @@ -295,7 +295,15 @@ fn civil_from_days(days: i64) -> (i32, u32, u32) { +/// there would turn the old silent fallback into a hard failure, so the check +/// only runs when there is a database to check against. +fn is_valid_timezone_in(db: &jiff::tz::TimeZoneDatabase, value: &str) -> bool { + value == "local" || db.is_definitively_empty() || db.get(value).is_ok() } </file context>

pullfrog

ℹ️ No blocking issues — one test-robustness suggestion inline.

Reviewed changes Reviewed the delta since the prior pullfrog review (ebc680f → ef24c8b).

Skipped validation without a zoneinfo database: is_valid_timezone now delegates to is_valid_timezone_in, which accepts any name when db.is_definitively_empty(), preserving the old silent fallback on minimal hosts instead of hard-failing even UTC.
Covered the bypass with unit tests: added an unconditional TimeZoneDatabase::none() test plus a zoneinfo-guarded accept/reject test in date_utils.rs.
Documented the fallback: the CLI options guide notes that names cannot be checked where no zoneinfo database exists.

Verified against the jiff 0.2.35 sources that TimeZoneDatabase::none(), is_definitively_empty(), and the top-level empty-get path (which, unlike the zoneinfo backend, has no UTC shortcut) make the bypass necessary and correctly placed.

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pullfrog · 2026-09-16T01:07:43Z

+            &["blocks", "--timezone", "Not/AZone"],
+            &["statusline", "--timezone", "Not/AZone"],
+        ] {
+            assert_eq!(validated(args), rejection("Not/AZone"), "{args:?}");


The CLI rejection tests assume a populated zoneinfo database, so on a host where the new bypass kicks in they would fail instead of passing.

ryoppippi · 2026-09-16T01:11:56Z

Thank you for this fix. The full Linux CI run exposed one regression: the documented UTC value was rejected because validation depended on the host zoneinfo database. I carried both of your commits into #1735 with authorship preserved, added a built-in UTC path plus a regression test, and re-ran the local gates. Closing this copy to avoid duplicate CI and review; #1735 is the merge candidate.

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Comment thread rust/crates/ccusage/src/cli/timezone.rs Resolved

fix(cli): mention local in the --timezone error

ebc680f

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ryoppippi mentioned this pull request Sep 16, 2026

fix(cli): reject unknown --timezone values #1735

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