Absolute symlinks cause warnings for PSR-4 scanning #12478
Description
$ composer diagnose
Composer version: 2.8.10
PHP version: 8.4.8
Create a new project with:
{
"name": "hello/hello",
"autoload": {
"psr-4": {
"MyTools\\": "tools/"
},
"exclude-from-classmap": [
"**/vendor/"
]
}
}
Init another project inside the tools directory:
(mkdir -p tools; cd tools; composer init --name=hello/tools --require=phpunit/phpunit:^9 -n; composer install)
Dump the optimized autoloader:
$ composer dump-autoload -o
Generating optimized autoload files
Generated optimized autoload files containing 1 classes
So far so good, the vendor exclusion works as expected.
Now, move the tools directory somewhere else and create an absolute symlink to it:
mv tools/ /tmp/
ln -s /tmp/tools
Dump the autoloader again:
composer dump-autoload -o
And observe an avalance of warnings:
Class PHPUnit\Framework\Exception located in ./tools/vendor/phpunit/phpunit/src/Framework/Exception/Exception.php does not comply with psr-4 autoloading standard (rule: MyTools\ => ./tools). Skipping.
Surprisingly, there is no such issue with relative symlinks:
mv tools tools2
ln -s tools2 tools
composer dump-autoload -o