# flatpak-override

## NAME



           flatpak-override - Override application requirements
    


## SYNOPSIS



    
           **flatpak override**[OPTION...] [APP]
    


## DESCRIPTION



           Overrides the application specified runtime requirements. This can
           be used to grant a sandboxed application more or less resources
           than it requested.
    
           By default the application gets access to the resources it
           requested when it is started. But the user can override it on a
           particular instance by specifying extra arguments to **flatpak run** ,
           or every time by using **flatpak override**.
    
           The application overrides are saved in text files residing in
           $XDG_DATA_HOME/flatpak/overrides in user mode.
    
           If the application ID APP is not specified then the overrides
           affect all applications, but the per-application overrides can
           override the global overrides.
    
           Unless overridden with the **--user** or **--installation** options, this
           command changes the default system-wide installation.
    


## OPTIONS



           The following options are understood:
    
           **-h** , **--help**
               Show help options and exit.
    
           **-u** , **--user**
               Update a per-user installation.
    
           **--system**
               Update the default system-wide installation.
    
           **--installation=NAME**
               Updates a system-wide installation specified by NAME among
               those defined in /etc/flatpak/installations.d/. Using
               **--installation=default** is equivalent to using **--system**.
    
           **--share=SUBSYSTEM**
               Share a subsystem with the host session. This overrides the
               Context section from the application metadata.  SUBSYSTEM must
               be one of: network, ipc. This option can be used multiple
               times.
    
           **--unshare=SUBSYSTEM**
               Don't share a subsystem with the host session. This overrides
               the Context section from the application metadata.  SUBSYSTEM
               must be one of: network, ipc. This option can be used multiple
               times.
    
           **--socket=SOCKET**
               Expose a well-known socket to the application. This overrides
               to the Context section from the application metadata.  SOCKET
               must be one of: x11, wayland, fallback-x11, pulseaudio,
               system-bus, session-bus, ssh-auth, pcsc, cups, gpg-agent,
               inherit-wayland-socket. This option can be used multiple
               times.
    
           **--nosocket=SOCKET**
               Don't expose a well-known socket to the application. This
               overrides to the Context section from the application
               metadata.  SOCKET must be one of: x11, wayland, fallback-x11,
               pulseaudio, system-bus, session-bus, ssh-auth, pcsc, cups,
               gpg-agent, inherit-wayland-socket. This option can be used
               multiple times.
    
           **--device=DEVICE**
               Expose a device to the application. This overrides to the
               Context section from the application metadata.  DEVICE must be
               one of: dri, input, usb, kvm, shm, all. This option can be
               used multiple times.
    
           **--nodevice=DEVICE**
               Don't expose a device to the application. This overrides to
               the Context section from the application metadata.  DEVICE
               must be one of: dri, input, usb, kvm, shm, all. This option
               can be used multiple times.
    
           **--allow=FEATURE**
               Allow access to a specific feature. This updates the [Context]
               group in the metadata.  FEATURE must be one of: devel,
               multiarch, bluetooth, canbus, per-app-dev-shm. This option can
               be used multiple times.
    
               See flatpak-build-finish(1) for the meaning of the various
               features.
    
           **--disallow=FEATURE**
               Disallow access to a specific feature. This updates the
               [Context] group in the metadata.  FEATURE must be one of:
               devel, multiarch, bluetooth, canbus, per-app-dev-shm. This
               option can be used multiple times.
    
           **--filesystem=FILESYSTEM**
               Allow the application access to a subset of the filesystem.
               This overrides to the Context section from the application
               metadata.  FILESYSTEM can be one of: home, host, host-os,
               host-etc, xdg-desktop, xdg-documents, xdg-download, xdg-music,
               xdg-pictures, xdg-public-share, xdg-templates, xdg-videos,
               xdg-run, xdg-config, xdg-cache, xdg-data, an absolute path, or
               a homedir-relative path like ~/dir or paths relative to the
               xdg dirs, like xdg-download/subdir. The optional :ro suffix
               indicates that the location will be read-only. The optional
               :create suffix indicates that the location will be read-write
               and created if it doesn't exist. This option can be used
               multiple times. See the "[Context] filesystems" list in
               flatpak-metadata(5) for details of the meanings of these
               filesystems.
    
           **--nofilesystem=FILESYSTEM**
               Undo the effect of a previous **--filesystem=** FILESYSTEM in the
               app's manifest or a lower-precedence layer of overrides,
               and/or remove a previous **--filesystem=** FILESYSTEM from this
               layer of overrides. This overrides the Context section of the
               application metadata.  FILESYSTEM can take the same values as
               for **--filesystem** , but the :ro and :create suffixes are not
               used here. This option can be used multiple times.
    
               This option does not prevent access to a more narrowly-scoped
               **--filesystem**. For example, if an application has the
               equivalent of **--filesystem=xdg-config/MyApp** in its manifest or
               as a system-wide override, and flatpak override --user
               --nofilesystem=home as a per-user override, then it will be
               prevented from accessing most of the home directory, but it
               will still be allowed to access $XDG_CONFIG_HOME/MyApp.
    
               As a special case, **--nofilesystem=host:reset** will ignore all
               **--filesystem** permissions inherited from the app manifest or a
               lower-precedence layer of overrides, in addition to having the
               behaviour of **--nofilesystem=host**.
    
           **--add-policy=SUBSYSTEM.KEY=VALUE**
               Add generic policy option. For example,
               "--add-policy=subsystem.key=v1 --add-policy=subsystem.key=v2"
               would map to this metadata:
    
                   [Policy subsystem]
                   key=v1;v2;
    
               This option can be used multiple times.
    
           **--remove-policy=SUBSYSTEM.KEY=VALUE**
               Remove generic policy option. This option can be used multiple
               times.
    
           **--env=VAR=VALUE**
               Set an environment variable in the application. This overrides
               to the Context section from the application metadata. This
               option can be used multiple times.
    
           **--unset-env=VAR**
               Unset an environment variable in the application. This
               overrides the unset-environment entry in the [Context] group
               of the metadata, and the [Environment] group. This option can
               be used multiple times.
    
           **--env-fd=**_FD_
               Read environment variables from the file descriptor _FD_ , and
               set them as if via **--env**. This can be used to avoid
               environment variables and their values becoming visible to
               other users.
    
               Each environment variable is in the form _VAR_ =_VALUE_ followed by
               a zero byte. This is the same format used by env -0 and
               /proc/*/environ.
    
           **--own-name=NAME**
               Allow the application to own the well-known name NAME on the
               session bus. This overrides to the Context section from the
               application metadata. This option can be used multiple times.
    
           **--talk-name=NAME**
               Allow the application to talk to the well-known name NAME on
               the session bus. This overrides to the Context section from
               the application metadata. This option can be used multiple
               times.
    
           **--no-talk-name=NAME**
               Don't allow the application to talk to the well-known name
               NAME on the session bus. This overrides to the Context section
               from the application metadata. This option can be used
               multiple times.
    
           **--system-own-name=NAME**
               Allow the application to own the well known name NAME on the
               system bus. If NAME ends with .*, it allows the application to
               own all matching names. This overrides to the Context section
               from the application metadata. This option can be used
               multiple times.
    
           **--system-talk-name=NAME**
               Allow the application to talk to the well known name NAME on
               the system bus. If NAME ends with .*, it allows the
               application to talk to all matching names. This overrides to
               the Context section from the application metadata. This option
               can be used multiple times.
    
           **--system-no-talk-name=NAME**
               Don't allow the application to talk to the well known name
               NAME on the system bus. If NAME ends with .*, it allows the
               application to talk to all matching names. This overrides to
               the Context section from the application metadata. This option
               can be used multiple times.
    
           **--persist=FILENAME**
               If the application doesn't have access to the real homedir,
               make the (homedir-relative) path FILENAME a bind mount to the
               corresponding path in the per-application directory, allowing
               that location to be used for persistent data. This overrides
               to the Context section from the application metadata. This
               option can be used multiple times.
    
           **--reset**
               Remove overrides. If an APP is given, remove the overrides for
               that application, otherwise remove the global overrides.
    
           **--show**
               Shows overrides. If an APP is given, shows the overrides for
               that application, otherwise shows the global overrides.
    
           **-v** , **--verbose**
               Print debug information during command processing.
    
           **--ostree-verbose**
               Print OSTree debug information during command processing.
    


## EXAMPLES



           **$ flatpak override --nosocket=wayland org.gnome.gedit**
    
           **$ flatpak override --filesystem=home org.mozilla.Firefox**
    


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