Validate and remove corrupted cache files during plugin/theme installation #472

Copilot · 2025-11-06T09:33:06Z

Cached plugin/theme downloads can become corrupted (expired license returning error text, interrupted downloads, disk issues). WP-CLI reuses these corrupted files without validation, causing repeated installation failures.

Changes

Validation logic (PackageValidator.php)

File size check (≥20 bytes) catches error messages masquerading as zips
unzip -t integrity test when available
Cross-platform null device handling (Windows/Unix)

Integration (UpgraderWithValidation.php trait)

Overrides WP_Upgrader::download_package() to validate before use
Deletes corrupted files from cache
Returns actionable error: "corrupted file removed, retry command"

Upgrader classes

ValidatingPluginUpgrader / ValidatingThemeUpgrader - normal installations
Updated DestructivePluginUpgrader / DestructiveThemeUpgrader - forced installations
Modified commands to use validating upgraders

Example

# Expired license returns "Denied" (7 bytes) instead of zip
$ wp plugin install premium-plugin
Error: Package failed validation (file too small: 7 bytes). 
Corrupted file removed from cache. Retry command.

# After renewing license
$ wp plugin install premium-plugin
Success: Installed 1 of 1 plugins.

Previously, the 7-byte cache file would be reused indefinitely until manually deleted.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

https://api.github.com/repos/Behat/Behat/zipball/1b6b08efa995fe4135901b862d112adc7e95ecbb
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/Behat/Gherkin/zipball/05a7459283e8e6af0d46ec25b8bb5960ca3cfa7b
- Triggering command: /usr/bin/php8.3 -n -c /tmp/J3JIXy /usr/bin/composer install (http block)
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/PHPCSStandards/PHPCSExtra/zipball/8e89a01c7b8fed84a12a2a7f5a23a44cdbe4f62e
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/PHPCSStandards/PHPCSUtils/zipball/8b8e17615d04f2fc2cd46fc1d2fd888fa21b3cf9
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/PHPCSStandards/PHP_CodeSniffer/zipball/0ca86845ce43291e8f5692c7356fccf3bcf02bf4
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/PHPCSStandards/composer-installer/zipball/e9cf5e4bbf7eeaf9ef5db34938942602838fc2b1
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/PHPCompatibility/PHPCompatibility/zipball/ff4efdd80e094a81fd6329b570c9a632f21d42b4
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/WordPress/WordPress-Coding-Standards/zipball/d2421de7cec3274ae622c22c744de9a62c7925af
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/Yoast/PHPUnit-Polyfills/zipball/134921bfca9b02d8f374c48381451da1d98402f9
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/bobthecow/mustache.php/zipball/176b6b21d68516dd5107a63ab71b0050e518b7a4
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/composer/pcre/zipball/b2bed4734f0cc156ee1fe9c0da2550420d99a21e
- Triggering command: /usr/bin/php8.3 -n -c /tmp/J3JIXy /usr/bin/composer install (http block)
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/composer/semver/zipball/198166618906cb2de69b95d7d47e5fa8aa1b2b95
- Triggering command: /usr/bin/php8.3 -n -c /tmp/J3JIXy /usr/bin/composer install (http block)
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/myclabs/DeepCopy/zipball/07d290f0c47959fd5eed98c95ee5602db07e0b6a
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/phar-io/manifest/zipball/54750ef60c58e43759730615a392c31c80e23176
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/phar-io/version/zipball/4f7fd7836c6f332bb2933569e566a0d6c4cbed74
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/php-fig/event-dispatcher/zipball/dbefd12671e8a14ec7f180cab83036ed26714bb0
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/php-fig/log/zipball/f16e1d5863e37f8d8c2a01719f5b34baa2b714d3
- Triggering command: /usr/bin/php8.3 -n -c /tmp/J3JIXy /usr/bin/composer install (http block)
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/php-parallel-lint/PHP-Console-Color/zipball/7adfefd530aa2d7570ba87100a99e2483a543b88
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/php-parallel-lint/PHP-Console-Highlighter/zipball/5b4803384d3303cf8e84141039ef56c8a123138d
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/php-parallel-lint/PHP-Parallel-Lint/zipball/6db563514f27e19595a19f45a4bf757b6401194e
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/php-stubs/wordpress-stubs/zipball/abeb5a8b58fda7ac21f15ee596f302f2959a7114
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/phpstan/extension-installer/zipball/85e90b3942d06b2326fba0403ec24fe912372936
- Triggering command: /usr/bin/php8.3 -n -c /tmp/J3JIXy /usr/bin/composer install (http block)
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/phpstan/phpstan-deprecation-rules/zipball/f94d246cc143ec5a23da868f8f7e1393b50eaa82
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/phpstan/phpstan-phpunit/zipball/72a6721c9b64b3e4c9db55abbc38f790b318267e
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/phpstan/phpstan-strict-rules/zipball/b564ca479e7e735f750aaac4935af965572a7845
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/phpstan/phpstan/zipball/2770dcdf5078d0b0d53f94317e06affe88419aa8
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/sebastianbergmann/phpunit/zipball/a94ea4d26d865875803b23aaf78c3c2c670ea2ea
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/sebastianbergmann/version/zipball/3e6ccf7657d4f0a59200564b08cead899313b53c
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/symfony/console/zipball/cdb80fa5869653c83cfe1a9084a673b6daf57ea7
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/symfony/dependency-injection/zipball/82119812ab0bf3425c1234d413efd1b19bb92ae4
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/symfony/event-dispatcher-contracts/zipball/59eb412e93815df44f05f342958efa9f46b1e586
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/symfony/event-dispatcher/zipball/b7dc69e71de420ac04bc9ab830cf3ffebba48191
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/symfony/finder/zipball/9f696d2f1e340484b4683f7853b273abff94421f
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/symfony/polyfill-php73/zipball/0f68c03565dcaaf25a890667542e8bd75fe7e5bb
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/symfony/translation-contracts/zipball/df210c7a2573f1913b2d17cc95f90f53a73d8f7d
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/symfony/translation/zipball/ec25870502d0c7072d086e8ffba1420c85965174
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/symfony/var-exporter/zipball/0f020b544a30a7fe8ba972e53ee48a74c0bc87f4
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/symfony/yaml/zipball/90208e2fc6f68f613eae7ca25a2458a931b1bacc
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/theseer/tokenizer/zipball/737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/wp-cli/cache-command/zipball/14f76b0bc8f9fa0a680e9c70e18fcf627774d055
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/wp-cli/entity-command/zipball/896b7fb5ed51fe556017b2c71126947db5cd2b68
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/wp-cli/eval-command/zipball/20ec428a7b9bc604fab0bd33ee8fa20662650455
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/wp-cli/language-command/zipball/ad1bbfbf2699eff415436a00bb4195900fa1cfe5
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/wp-cli/php-cli-tools/zipball/f12b650d3738e471baed6dd47982d53c5c0ab1c3
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/wp-cli/scaffold-command/zipball/cd1e49a393b1af4eee4f5ccc3ac562862c65ccdf
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/wp-cli/spyc/zipball/6aa0b4da69ce9e9a2c8402dab8d43cf32c581cc7
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/wp-cli/wp-cli-tests/zipball/75b660dddaa9f512d104d93da4a0a3ede1183a93
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)
https://api.github.com/repos/wp-cli/wp-cli/zipball/ee4fb67b12eb904527bde1c4a0a4d6538a14681a
- Triggering command: /usr/bin/php8.3 -n -c /tmp/yUk5eU /usr/bin/composer install --no-interaction (http block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

This section details on the original issue you should resolve

<issue_title>wp plugin install should ignore corrupted cache files</issue_title>
<issue_description>If a plugin (or theme?) install has previously cached the downloaded zip and the cached zip file will be used again (e.g. for a plugin re-install or perhaps another WP site on the same server could use it?), then there's no validation on the downloaded cache file before it's re-used.

A quick and dirty validation would be to ignore any cache file less than a (small) size e.g. 20 bytes and re-download it as if it wasn't there. Similarly, it should check its size after download and delete it (and maybe retry download?) if it's under 20 bytes.

If it's >=20 bytes and the "unzip" binary is in the PATH, then run "unzip -t" on the zip file and check for success (0 return code). If it fails, delete it and re-download it.

In case you're wondering how a download could get corrupted (apart from the obvious full or corrupted filing system scenarios) - one possibility is where your license for a commercial plugin runs out and the next version's "download" actually becomes an error string ("Denied" or whatever). I had a 7-byte zip download because of that and wp-cli (1.5.1) kept trying to use it every day and failing to. If it had validated it, deleted it and re-downloaded it, it would have fixed the problem automatically (once I'd renewed the license of course).</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes wp plugin install should ignore corrupted cache files #123

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

- Create PackageValidator class to validate downloaded zip files - Implement validation checks: file size >= 20 bytes and zip integrity test with unzip - Create UpgraderWithValidation trait for WP_Upgrader classes - Add ValidatingPluginUpgrader and ValidatingThemeUpgrader classes - Update DestructivePluginUpgrader and DestructiveThemeUpgrader to use validation - Integrate validation into Plugin_Command and Theme_Command Co-authored-by: swissspidy <[email protected]>

Instead of attempting automatic retry, delete corrupted file and ask user to retry. This is simpler and more reliable since WP-CLI cache manager handles re-downloads. Co-authored-by: swissspidy <[email protected]>

- Suppress unzip command output to avoid cluttering console - Use platform-appropriate null device (NUL on Windows, /dev/null on Unix) - Add proper output redirection for both version check and validation Co-authored-by: swissspidy <[email protected]>

Add exclusions for PackageValidator, ValidatingPluginUpgrader, ValidatingThemeUpgrader, and UpgraderWithValidation from namespace prefix rules Co-authored-by: swissspidy <[email protected]>

- Properly escape null device path in shell commands to prevent injection - Remove error suppression operator and add explicit error logging - Use more precise phpcs exclude patterns instead of wildcards Co-authored-by: swissspidy <[email protected]>

Added comments explaining that null device paths are hardcoded constants and safe to use in shell commands, addressing static analysis concerns. Co-authored-by: swissspidy <[email protected]>

src/WP_CLI/PackageValidator.php

codecov · 2025-11-06T11:33:26Z

Codecov Report

❌ Patch coverage is 47.29730% with 39 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/WP_CLI/PackageValidator.php	55.10%	22 Missing ⚠️
src/WP_CLI/UpgraderWithValidation.php	26.08%	17 Missing ⚠️

📢 Thoughts on this report? Let us know!

swissspidy · 2025-11-10T17:35:04Z

Perhaps this should be addressed in FileCache or WpHttpCacheManager instead. So that we don't cache a corrupt file in the first place. Right now, this PR validates & deletes the downloaded file, but it will be added to FileCache regardless. So this implementation doesn't actually work. A Behat test with some request mocking would show this.

WpHttpCacheManager could automatically do some validation based on the detected content-type.

If that's too much, it could be added to whitelist_package(), e.g. an extra arg that configures validation.

swissspidy · 2025-11-12T11:06:02Z

Closing as per #123 (comment)

Initial plan

58cd3da

Copilot AI assigned Copilot and swissspidy Nov 6, 2025

Copilot started work on behalf of swissspidy November 6, 2025 09:33 View session

Copilot AI and others added 6 commits November 6, 2025 09:49

Simplify cache validation retry logic

f80b016

Instead of attempting automatic retry, delete corrupted file and ask user to retry. This is simpler and more reliable since WP-CLI cache manager handles re-downloads. Co-authored-by: swissspidy <[email protected]>

Update phpcs configuration for new validator classes

61d08c9

Add exclusions for PackageValidator, ValidatingPluginUpgrader, ValidatingThemeUpgrader, and UpgraderWithValidation from namespace prefix rules Co-authored-by: swissspidy <[email protected]>

Add security comments clarifying safe shell command usage

6552b3a

Added comments explaining that null device paths are hardcoded constants and safe to use in shell commands, addressing static analysis concerns. Co-authored-by: swissspidy <[email protected]>

Copilot AI changed the title ~~[WIP] Fix plugin install to ignore corrupted cache files~~ Validate and remove corrupted cache files during plugin/theme installation Nov 6, 2025

Copilot AI requested a review from swissspidy November 6, 2025 10:02

Copilot finished work on behalf of swissspidy November 6, 2025 10:02

swissspidy reviewed Nov 6, 2025

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src/WP_CLI/PackageValidator.php Outdated Show resolved Hide resolved

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swissspidy requested a review from Copilot November 8, 2025 09:41

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swissspidy mentioned this pull request Nov 10, 2025

Cache file validation in cache manager wp-cli/wp-cli#6148

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swissspidy closed this Nov 12, 2025

swissspidy deleted the copilot/ignore-corrupted-cache-files branch November 12, 2025 11:06

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Validate and remove corrupted cache files during plugin/theme installation #472

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