Description File attributes in GIO consist of a list of key-value pairs. Keys are strings that contain a key namespace and a key name, separated by a colon, e.g. "namespace:keyname". Namespaces are included to sort key-value pairs by namespaces for relevance. Keys can be retrived using wildcards, e.g. "standard::*" will return all of the keys in the "standard" namespace. Values are stored within the list in GFileAttributeValue structures. Values can store different types, listed in the enum GFileAttributeType. Upon creation of a GFileAttributeValue, the type will be set to G_FILE_ATTRIBUTE_TYPE_INVALID. The list of possible attributes for a filesystem (pointed to by a GFile) is availible as a GFileAttributeInfoList. This list is queryable by key names as indicated earlier. Classes that implement GFileIface will create a GFileAttributeInfoList and install default keys and values for their given file system, architecture, and other possible implementation details (e.g., on a UNIX system, a file attribute key will be registered for the user id for a given file). Table 1. GFileAttributes Default Namespaces Namspace Description "standard" The "Standard" namespace. General file information that any application may need should be put in this namespace. Examples include the file's name, type, and size. "etag" The "Entity Tag" namespace. Currently, the only key in this namespace is "value", which contains the value of the current entity tag. "id" The "Identification" namespace. This namespace is used by file managers and applications that list directories to check for loops and to uniquely identify files. "access" The "Access" namespace. Used to check if a user has the proper privilidges to access files and perform file operations. Keys in this namespace are made to be generic and easily understood, e.g. the "can_read" key is TRUE if the current user has permission to read the file. UNIX permissions and NTFS ACLs in Windows should be mapped to these values. "mountable" The "Mountable" namespace. Includes simple boolean keys for checking if a file or path supports mount operations, e.g. mount, unmount, eject. These are used for files of type G_FILE_TYPE_MOUNTABLE. "time" The "Time" namespace. Includes file access, changed, created times. "unix" The "Unix" namespace. Includes UNIX-specific information and may not be available for all files. Examples include the UNIX "UID", "GID", etc. "dos" The "DOS" namespace. Includes DOS-specific information and may not be available for all files. Examples include "is_system" for checking if a file is marked as a system file, and "is_archive" for checking if a file is marked as an archive file. "owner" The "Owner" namespace. Includes information about who owns a file. May not be available for all file systems. Examples include "user" for getting the user name of the file owner. This information is often mapped from some backend specific data such as a unix UID. "thumbnail" The "Thumbnail" namespace. Includes information about file thumbnails and their location within the file system. Exaples of keys in this namespace include "path" to get the location of a thumbnail, and "failed" to check if thumbnailing of the file failed. "filesystem" The "Filesystem" namespace. Gets information about the file system where a file is located, such as its type, how much space is left available, and the overall size of the file system. "gvfs" The "GVFS" namespace. Keys in this namespace contain information about the current GVFS backend in use. "xattr" The "xattr" namespace. Gets information about extended user attributes. See attr(5). The "user." prefix of the extended user attribute name is stripped away when constructing keys in this namespace, e.g. "xattr::mime_type" for the extended attribute with the name "user.mime_type". Note that this information is only available if GLib has been built with extended attribute support. "xattr-sys" The "xattr-sys" namespace. Gets information about extended attributes which are not user-specific. See attr(5). Note that this information is only available if GLib has been built with extended attribute support. "selinux" The "SELinux" namespace. Includes information about the SELinux context of files. Note that this information is only available if GLib has been built with SELinux support. Please note that these are not all of the possible namespaces. More namespaces can be added from GIO modules or by individual applications. For more information about writing GIO modules, see GIOModule. Table 2. GFileAttributes Built-in Keys and Value Types Enum Value Namespace:Key Value Type G_FILE_ATTRIBUTE_STANDARD_TYPE standard::type uint32 (GFileType) G_FILE_ATTRIBUTE_STANDARD_IS_HIDDEN standard::is-hidden boolean G_FILE_ATTRIBUTE_STANDARD_IS_BACKUP standard::is-backup boolean G_FILE_ATTRIBUTE_STANDARD_IS_SYMLINK standard::is-symlink boolean G_FILE_ATTRIBUTE_STANDARD_IS_VIRTUAL standard::is-virtual boolean G_FILE_ATTRIBUTE_STANDARD_NAME standard::name byte string G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME standard::display-name string G_FILE_ATTRIBUTE_STANDARD_EDIT_NAME standard::edit-name string G_FILE_ATTRIBUTE_STANDARD_ICON standard::icon object (GIcon) G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE standard::content-type string G_FILE_ATTRIBUTE_STANDARD_FAST_CONTENT_TYPE standard::fast-content-type string G_FILE_ATTRIBUTE_STANDARD_SIZE standard::size uint64 G_FILE_ATTRIBUTE_STANDARD_ALLOCATED_SIZE standard::allocated-size uint64 G_FILE_ATTRIBUTE_STANDARD_SYMLINK_TARGET standard::symlink-target byte string G_FILE_ATTRIBUTE_STANDARD_TARGET_URI standard::target-uri string G_FILE_ATTRIBUTE_STANDARD_SORT_ORDER standard::sort-order int32 G_FILE_ATTRIBUTE_ETAG_VALUE etag::value string G_FILE_ATTRIBUTE_ID_FILE id::file string G_FILE_ATTRIBUTE_ID_FILESYSTEM id::filesystem string G_FILE_ATTRIBUTE_ACCESS_CAN_READ access::can-read boolean G_FILE_ATTRIBUTE_ACCESS_CAN_WRITE access::can-write boolean G_FILE_ATTRIBUTE_ACCESS_CAN_EXECUTE access::can-execute boolean G_FILE_ATTRIBUTE_ACCESS_CAN_DELETE access::can-delete boolean G_FILE_ATTRIBUTE_ACCESS_CAN_TRASH access::can-trash boolean G_FILE_ATTRIBUTE_ACCESS_CAN_RENAME access::can-rename boolean G_FILE_ATTRIBUTE_MOUNTABLE_CAN_MOUNT mountable::can-mount boolean G_FILE_ATTRIBUTE_MOUNTABLE_CAN_UNMOUNT mountable::can-unmount boolean G_FILE_ATTRIBUTE_MOUNTABLE_CAN_EJECT mountable::can-eject boolean G_FILE_ATTRIBUTE_MOUNTABLE_UNIX_DEVICE mountable::unix-device uint32 G_FILE_ATTRIBUTE_MOUNTABLE_UNIX_DEVICE_FILE mountable::unix-device-file string G_FILE_ATTRIBUTE_MOUNTABLE_HAL_UDI mountable::hal-udi string G_FILE_ATTRIBUTE_TIME_MODIFIED time::modified uint64 G_FILE_ATTRIBUTE_TIME_MODIFIED_USEC time::modified-usec uint32 G_FILE_ATTRIBUTE_TIME_ACCESS time::access uint64 G_FILE_ATTRIBUTE_TIME_ACCESS_USEC time::access-usec uint32 G_FILE_ATTRIBUTE_TIME_CHANGED time::changed uint64 G_FILE_ATTRIBUTE_TIME_CHANGED_USEC time::changed-usec uint32 G_FILE_ATTRIBUTE_TIME_CREATED time::created uint64 G_FILE_ATTRIBUTE_TIME_CREATED_USEC time::created-usec uint32 G_FILE_ATTRIBUTE_UNIX_DEVICE unix::device uint32 G_FILE_ATTRIBUTE_UNIX_INODE unix::inode uint64 G_FILE_ATTRIBUTE_UNIX_MODE unix::mode uint32 G_FILE_ATTRIBUTE_UNIX_NLINK unix::nlink uint32 G_FILE_ATTRIBUTE_UNIX_UID unix::uid uint32 G_FILE_ATTRIBUTE_UNIX_GID unix::gid uint32 G_FILE_ATTRIBUTE_UNIX_RDEV unix::rdev uint32 G_FILE_ATTRIBUTE_UNIX_BLOCK_SIZE unix::block-size uint32 G_FILE_ATTRIBUTE_UNIX_BLOCKS unix::blocks uint64 G_FILE_ATTRIBUTE_UNIX_IS_MOUNTPOINT unix::is-mountpoint boolean G_FILE_ATTRIBUTE_DOS_IS_ARCHIVE dos::is-archive boolean G_FILE_ATTRIBUTE_DOS_IS_SYSTEM dos::is-system boolean G_FILE_ATTRIBUTE_OWNER_USER owner::user string G_FILE_ATTRIBUTE_OWNER_USER_REAL owner::user-real string G_FILE_ATTRIBUTE_OWNER_GROUP owner::group string G_FILE_ATTRIBUTE_THUMBNAIL_PATH thumbnail::path bytestring G_FILE_ATTRIBUTE_THUMBNAILING_FAILED thumbnail::failed boolean G_FILE_ATTRIBUTE_PREVIEW_ICON preview::icon object (GIcon) G_FILE_ATTRIBUTE_FILESYSTEM_SIZE filesystem::size uint64 G_FILE_ATTRIBUTE_FILESYSTEM_FREE filesystem::free uint64 G_FILE_ATTRIBUTE_FILESYSTEM_TYPE filesystem::type string G_FILE_ATTRIBUTE_FILESYSTEM_READONLY filesystem::readonly boolean G_FILE_ATTRIBUTE_GVFS_BACKEND gvfs::backend string G_FILE_ATTRIBUTE_SELINUX_CONTEXT selinux::context string Note that there are no predefined keys in the "xattr" and "xattr-sys" namespaces. Keys for the "xattr" namespace are constructed by stripping away the "user." prefix from the extended user attribute, and prepending "xattr::". Keys for the "xattr-sys" namespace are constructed by concatenating "xattr-sys::" with the extended attribute name. All extended attribute values are returned as hex-encoded strings in which bytes outside the ASCII range are encoded as hexadecimal escape sequences of the form \xnn.