refactor: use fully-qualified syntax for Error types

[xtqqczze]

• Replace direct imports of Error types from external crates with locally defined or fully qualified error handling paths.
• Improve maintainability and refactor safety

cc: @cakebaker

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/date/date-locale-hour (passes in this run but fails in the 'main' branch)
Congrats! The gnu test tests/printf/printf-surprise is now passing!
Skip an intermittent issue tests/cut/bounded-memory (was skipped on 'main', now failing)

[codspeed-hq]

Merging this PR will not alter performance

✅ 311 untouched benchmarks
⏩ 46 skipped benchmarks¹

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_{Comparing xtqqczze:error-import (a38a2d6) with main (5316f58)}

Footnotes

1. 46 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[Copilot]

Pull request overview

This PR refactors error-related imports and trait paths to reduce reliance on importing Error types directly (from std, clap, and thiserror), favoring fully-qualified paths and core::error::Error where applicable to improve refactor-safety.

Changes:

• Replace use ... Error imports with fully-qualified references (e.g., std::io::Error::..., clap::error::Error).
• Update many custom error derives to #[derive(..., thiserror::Error)] without importing thiserror::Error.
• Switch various trait bounds/return types/impls from std::error::Error to core::error::Error.

Reviewed changes

Copilot reviewed 76 out of 76 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/by-util/test_cat.rs	Avoid importing std::io::Error; use fully-qualified constructor.
src/uucore/src/lib/mods/locale.rs	Remove thiserror::Error import; use thiserror::Error in derive path.
src/uucore/src/lib/mods/error.rs	Prefer core::error::Error in docs/trait bounds/impls to avoid std::error::Error import.
src/uucore/src/lib/mods/clap_localization.rs	Bring core::error::Error trait into scope without naming conflicts.
src/uucore/src/lib/lib.rs	Implement core::error::Error for a local error type.
src/uucore/src/lib/features/uptime.rs	Remove thiserror::Error import; qualify derive.
src/uucore/src/lib/features/systemd_logind.rs	Return Box<dyn core::error::Error> instead of std path.
src/uucore/src/lib/features/smack.rs	Remove thiserror::Error import; qualify derive.
src/uucore/src/lib/features/selinux.rs	Use core::error::Error in error-chain formatting API.
src/uucore/src/lib/features/safe_traversal.rs	Normalize derive order with qualified thiserror::Error.
src/uucore/src/lib/features/perms.rs	Avoid importing std::io::Error alias; fully qualify last_os_error.
src/uucore/src/lib/features/parser/parse_size.rs	Implement core::error::Error instead of importing std::error::Error.
src/uucore/src/lib/features/fsext.rs	Remove IOError alias; fully qualify std::io::Error::last_os_error.
src/uucore/src/lib/features/fs.rs	Avoid importing std::io::Error; use fully-qualified constructors.
src/uucore/src/lib/features/format/mod.rs	Implement core::error::Error without importing std::error::Error.
src/uucore/src/lib/features/entries.rs	Remove IOError alias; fully qualify std::io::Error constructors.
src/uucore/src/lib/features/checksum/mod.rs	Remove thiserror::Error import; qualify derive.
src/uucore/src/lib/features/buf_copy/common.rs	Implement core::error::Error for local error type.
src/uucore/src/lib/features/backup_control.rs	Implement core::error::Error without importing std::error::Error.
src/uucore/build.rs	Use Box<dyn core::error::Error> for build-script error types.
src/uu/wc/src/wc.rs	Remove thiserror::Error import; qualify derive.
src/uu/wc/src/utf8/read.rs	Remove thiserror::Error import; qualify derive.
src/uu/uptime/src/uptime.rs	Remove thiserror::Error import; qualify derive.
src/uu/uniq/src/uniq.rs	Avoid importing clap’s Error; use fully-qualified clap::error::Error.
src/uu/unexpand/src/unexpand.rs	Remove thiserror::Error import; qualify derive.
src/uu/tsort/src/tsort.rs	Remove thiserror::Error import; qualify derive.
src/uu/tr/src/operation.rs	Implement core::error::Error without importing std::error::Error.
src/uu/touch/src/touch.rs	Avoid importing std::io::Error; use fully-qualified constructors.
src/uu/touch/src/error.rs	Remove thiserror::Error import; qualify derive.
src/uu/test/src/error.rs	Remove thiserror::Error import; qualify derive.
src/uu/tee/src/tee.rs	Avoid importing std::io::Error; fully qualify error creation and parameter types.
src/uu/tac/src/error.rs	Remove thiserror::Error import; qualify derive.
src/uu/stdbuf/src/stdbuf.rs	Remove thiserror::Error import; qualify derive.
src/uu/stat/src/stat.rs	Remove thiserror::Error import; qualify derive.
src/uu/split/src/strategy.rs	Remove thiserror::Error import; qualify derive.
src/uu/split/src/split.rs	Remove thiserror::Error import; qualify derive.
src/uu/split/src/platform/windows.rs	Avoid importing std::io::Error; fully qualify Error::other.
src/uu/split/src/platform/unix.rs	Avoid importing std::io::Error; fully qualify Error::other.
src/uu/split/src/number.rs	Implement core::error::Error without importing std::error::Error.
src/uu/split/src/filenames.rs	Remove thiserror::Error import; qualify derive.
src/uu/sort/src/sort.rs	Remove thiserror::Error import; qualify derive.
src/uu/seq/src/error.rs	Remove thiserror::Error import; qualify derive.
src/uu/runcon/src/errors.rs	Use core::error::Error for error-chain formatting and impls.
src/uu/rm/src/rm.rs	Remove thiserror::Error import; qualify derive.
src/uu/ptx/src/ptx.rs	Remove thiserror::Error import; qualify derive.
src/uu/pr/src/pr.rs	Remove thiserror::Error import; qualify derive.
src/uu/od/src/mockstream.rs	Avoid importing std::io::Error; use fully-qualified constructor.
src/uu/numfmt/src/numfmt.rs	Avoid importing std::io::Error; use fully-qualified error type and constructor.
src/uu/numfmt/src/errors.rs	Remove thiserror::Error import; qualify derive.
src/uu/nohup/src/nohup.rs	Avoid importing std::io::Error; fully qualify error types and last_os_error.
src/uu/mv/src/hardlink.rs	Implement core::error::Error and update source() signature accordingly.
src/uu/mv/src/error.rs	Remove thiserror::Error import; qualify derive.
src/uu/more/src/more.rs	Implement core::error::Error for local error type.
src/uu/mktemp/src/mktemp.rs	Remove thiserror::Error import; qualify derive.
src/uu/ls/src/ls.rs	Remove thiserror::Error import; qualify derive.
src/uu/ln/src/ln.rs	Remove thiserror::Error import; qualify derive.
src/uu/kill/src/kill.rs	Avoid importing std::io::Error; fully qualify from_raw_os_error.
src/uu/join/src/join.rs	Remove thiserror::Error import; qualify derive.
src/uu/install/src/install.rs	Remove thiserror::Error import; qualify derive.
src/uu/head/src/head.rs	Remove thiserror::Error import; qualify derive.
src/uu/groups/src/groups.rs	Remove thiserror::Error import; qualify derive.
src/uu/fmt/src/fmt.rs	Remove thiserror::Error import; qualify derive.
src/uu/expr/src/expr.rs	Remove thiserror::Error import; qualify derive.
src/uu/expand/src/expand.rs	Remove thiserror::Error import; qualify derive.
src/uu/env/src/env.rs	Remove thiserror::Error import; qualify derive.
src/uu/du/src/du.rs	Remove thiserror::Error import; qualify derive.
src/uu/df/src/df.rs	Remove thiserror::Error import; qualify derive.
src/uu/df/src/columns.rs	Remove thiserror::Error import; qualify derive.
src/uu/dd/src/parseargs.rs	Remove thiserror::Error import; qualify derive.
src/uu/csplit/src/csplit_error.rs	Remove thiserror::Error import; qualify derive.
src/uu/cp/src/cp.rs	Remove thiserror::Error import; qualify derive and implement core::error::Error for BackupError.
src/uu/chroot/src/error.rs	Avoid importing std::io::Error; fully qualify error types in variants and derive.
src/uu/chroot/src/chroot.rs	Avoid importing std::io::Error; fully qualify last_os_error usage.
src/uu/chmod/src/chmod.rs	Remove thiserror::Error import; qualify derive.
src/uu/chcon/src/errors.rs	Remove thiserror::Error import; use core::error::Error for error-chain formatting.
src/uu/cat/src/cat.rs	Remove thiserror::Error import; qualify derive.

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