/usr/share/php/Composer/Package/ is in composer 1.0.0~beta2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Composer/Package/AliasPackage.php
/usr/share/php/Composer/Package/Archiver/
/usr/share/php/Composer/Package/Archiver/ArchivableFilesFinder.php
/usr/share/php/Composer/Package/Archiver/ArchiveManager.php
/usr/share/php/Composer/Package/Archiver/ArchiverInterface.php
/usr/share/php/Composer/Package/Archiver/BaseExcludeFilter.php
/usr/share/php/Composer/Package/Archiver/ComposerExcludeFilter.php
/usr/share/php/Composer/Package/Archiver/GitExcludeFilter.php
/usr/share/php/Composer/Package/Archiver/HgExcludeFilter.php
/usr/share/php/Composer/Package/Archiver/PharArchiver.php
/usr/share/php/Composer/Package/Archiver/ZipArchiver.php
/usr/share/php/Composer/Package/BasePackage.php
/usr/share/php/Composer/Package/CompletePackage.php
/usr/share/php/Composer/Package/CompletePackageInterface.php
/usr/share/php/Composer/Package/Dumper/
/usr/share/php/Composer/Package/Dumper/ArrayDumper.php
/usr/share/php/Composer/Package/Link.php
/usr/share/php/Composer/Package/LinkConstraint/
/usr/share/php/Composer/Package/LinkConstraint/EmptyConstraint.php
/usr/share/php/Composer/Package/LinkConstraint/LinkConstraintInterface.php
/usr/share/php/Composer/Package/LinkConstraint/MultiConstraint.php
/usr/share/php/Composer/Package/LinkConstraint/SpecificConstraint.php
/usr/share/php/Composer/Package/LinkConstraint/VersionConstraint.php
/usr/share/php/Composer/Package/Loader/
/usr/share/php/Composer/Package/Loader/ArrayLoader.php
/usr/share/php/Composer/Package/Loader/InvalidPackageException.php
/usr/share/php/Composer/Package/Loader/JsonLoader.php
/usr/share/php/Composer/Package/Loader/LoaderInterface.php
/usr/share/php/Composer/Package/Loader/RootPackageLoader.php
/usr/share/php/Composer/Package/Loader/ValidatingArrayLoader.php
/usr/share/php/Composer/Package/Locker.php
/usr/share/php/Composer/Package/Package.php
/usr/share/php/Composer/Package/PackageInterface.php
/usr/share/php/Composer/Package/RootAliasPackage.php
/usr/share/php/Composer/Package/RootPackage.php
/usr/share/php/Composer/Package/RootPackageInterface.php
/usr/share/php/Composer/Package/Version/
/usr/share/php/Composer/Package/Version/VersionGuesser.php
/usr/share/php/Composer/Package/Version/VersionParser.php
/usr/share/php/Composer/Package/Version/VersionSelector.php