FLATPAK RUN(1)

NAME
flatpak-run - Run an application or open a shell in a runtime

SYNOPSIS

flatpak run [OPTION...] REF [ARG...]

DESCRIPTION

If REF names an installed application, Flatpak runs the application in a sandboxed environment. Extra arguments are passed on to the application. The current branch and arch of the application is used unless otherwise specified with --branch or --arch. See flatpak-make-current(1).

If REF names a runtime, a shell is opened in the runtime. This is useful for development and testing. If there is ambiguity about which branch to use, you will be prompted to choose. Use --branch to avoid this. The primary arch is used unless otherwise specified with --arch.

By default, Flatpak will look for the application or runtime in the per-user installation first, then in all system installations. This can be overridden with the --user, --system and --installation options.

Flatpak creates a sandboxed environment for the application to run in by mounting the right runtime at /usr and a writable directory at /var, whose content is preserved between application runs. The application itself is mounted at /app.

The details of the sandboxed environment are controlled by the application metadata and various options like --share and --socket that are passed to the run command: Access is allowed if it was requested either in the application metadata file or with an option and the user hasn't overridden it.

The remaining arguments are passed to the command that gets run in the sandboxed environment. See the --file-forwarding option for handling of file arguments.

Environment variables are generally passed on to the sandboxed application, with certain exceptions. The application metadata can override environment variables, as well as the --env option. Apart from that, Flatpak always unsets or overrides the following variables, since their session values are likely to interfere with the functioning of the sandbox:
    PATH
    LD_LIBRARY_PATH
    LD_PRELOAD
    LD_AUDIT
    XDG_CONFIG_DIRS
    XDG_DATA_DIRS
    SHELL
    TEMP
    TEMPDIR
    TMP
    TMPDIR
    XDG_RUNTIME_DIR
    container
    TZDIR
    PYTHONPATH
    PERLLIB
    PERL5LIB
    XCURSOR_PATH
    GST_PLUGIN_PATH_1_0
    GST_REGISTRY
    GST_REGISTRY_1_0
    GST_PLUGIN_PATH
    GST_PLUGIN_SYSTEM_PATH
    GST_PLUGIN_SCANNER
    GST_PLUGIN_SCANNER_1_0
    GST_PLUGIN_SYSTEM_PATH_1_0
    GST_PRESET_PATH
    GST_PTP_HELPER
    GST_PTP_HELPER_1_0
    GST_INSTALL_PLUGINS_HELPER
    KRB5CCNAME
    XKB_CONFIG_ROOT
    GIO_EXTRA_MODULES
    GDK_BACKEND
    VK_ADD_DRIVER_FILES
    VK_ADD_LAYER_PATH
    VK_DRIVER_FILES
    VK_ICD_FILENAMES
    VK_LAYER_PATH
    __EGL_EXTERNAL_PLATFORM_CONFIG_DIRS
    __EGL_EXTERNAL_PLATFORM_CONFIG_FILENAMES
    __EGL_VENDOR_LIBRARY_DIRS
    __EGL_VENDOR_LIBRARY_FILENAMES

Also several environment variables with the prefix "GST_" that are used by gstreamer are unset (since Flatpak 1.12.5).

Flatpak also overrides the XDG environment variables to point sandboxed applications at their writable filesystem locations below ~/.var/app/$APPID/:
    XDG_DATA_HOME
    XDG_CONFIG_HOME
    XDG_CACHE_HOME
    XDG_STATE_HOME (since Flatpak 1.13)

Apps can use the --persist=.local/state and --unset-env=XDG_STATE_HOME options to get a Flatpak 1.13-compatible ~/.local/state on older versions of Flatpak.

The host values of these variables are made available inside the sandbox via these HOST_-prefixed variables:
    HOST_XDG_DATA_HOME
    HOST_XDG_CONFIG_HOME
    HOST_XDG_CACHE_HOME
    HOST_XDG_STATE_HOME (since Flatpak 1.13)

Flatpak sets the environment variable FLATPAK_ID to the application ID of the running app.

Flatpak also bind-mounts as read-only the host's /etc/os-release (if available, or /usr/lib/os-release as a fallback) to /run/host/os-release in accordance with the os-release specification[1].

If parental controls support is enabled, flatpak will check the current user’s parental controls settings, and will refuse to run an app if it is blocklisted for the current user.

OPTIONS

The following options are understood:

-h, --help
    Show help options and exit.

-u, --user
    Look for the application and runtime in per-user installations.

--system
    Look for the application and runtime in the default system-wide installations.

--installation=NAME
    Look for the application and runtime in the system-wide installation specified by NAME among those defined in /etc/flatpak/installations.d/. Using --installation=default is equivalent to using --system.

-v, --verbose
    Print debug information during command processing.

--ostree-verbose
    Print OSTree debug information during command processing.

--arch=ARCH
    The architecture to run. See flatpak --supported-arches for architectures supported by the host.

--command=COMMAND
    The command to run instead of the one listed in the application metadata.

--cwd=DIR
    The directory to run the command in. Note that this must be a directory inside the sandbox.

--branch=BRANCH
    The branch to use.

-d, --devel
    Use the devel runtime that is specified in the application metadata instead of the regular runtime, and use a seccomp profile that is less likely to break development tools.

--runtime=RUNTIME
    Use this runtime instead of the one that is specified in the application metadata. This is a full tuple, like for example org.freedesktop.Sdk/x86_64/1.2, but partial tuples are allowed. Any empty or missing parts are filled in with the corresponding values specified by the app.

--runtime-version=VERSION
    Use this version of the runtime instead of the one that is specified in the application metadata. This overrides any version specified with the --runtime option.

--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, usb, input, 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, usb, input, kvm, shm, all. This option can be used multiple times.

--allow=FEATURE
    Allow access to a specific feature. This overrides to the Context section from the application metadata. FEATURE must be one of: devel, multiarch, bluetooth. 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 overrides to the Context section from the application metadata. FEATURE must be one of: devel, multiarch, bluetooth. 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 and/or the overrides set up with flatpak-override(1). 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 flatpak-override(1), 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.

--usb=TYPE[:DATA]
    Adds a USB device query to the application metadata. This allows device enumeration and usage by the USB portal. TYPE must be one of: all, cls, dev, vnd.

    all
        Match all devices.

    cls
        A device class and subclass query. DATA must be in the form of CLASS:SUBCLASS where both CLASS and SUBCLASS must be a valid 2-digit hexadecimal class id number. Alternatively, SUBCLASS may be * to match all subclasses.

    dev
        A device product id query. DATA must be a valid 4-digit hexadecimal product id number, for example 0a1b. It requires a vnd filter in the query.

    vnd
        A device vendor id query. DATA must be a valid 4-digit hexadecimal vendor id number greater than zero, for example 0fab.

    It is possible to compose multiple device queries together with the + sign, for example --usb=vnd:0123+dev:4567. The dev filter requires a vnd. Available since 1.15.11.

--nousb=VENDOR_ID:PRODUCT_ID
    Adds a blocking USB device query to the application metadata. Blocked devices take precedence over allowed devices. The syntax is exactly equal to --usb. Available since 1.15.11.

--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. 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.

--talk-name=NAME
    Allow the application to talk to the well known name NAME on the session 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.

--no-talk-name=NAME
    Don't allow the application to talk to the well known name NAME on the session 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-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.

--a11y-own-name=NAME
    Allow the application to own the well known name NAME on the a11y 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.

--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.

--no-session-bus
    Run this instance without the filtered access to the session dbus connection. Note, this is the default when run with --sandbox.

--session-bus
    Allow filtered access to the session dbus connection. This is the default, except when run with --sandbox.

    In sandbox mode, even if you allow access to the session bus the sandbox cannot talk to or own the application ids (org.the.App.*) on the bus (unless explicitly added), only names in the .Sandboxed subset (org.the.App.Sandboxed.* and org.mpris.MediaPlayer2.org.the.App.Sandboxed.*).

--no-a11y-bus
    Run this instance without the access to the accessibility bus. Note, this is the default when run with --sandbox.

--a11y-bus
    Allow access to the accessibility bus. This is the default, except when run with --sandbox.

--sandbox
    Run the application in sandboxed mode, which means dropping all the extra permissions it would otherwise have, as well as access to the session/system/a11y busses and document portal.

--log-session-bus
    Log session bus traffic. This can be useful to see what access you need to allow in your D-Bus policy.

--log-system-bus
    Log system bus traffic. This can be useful to see what access you need to allow in your D-Bus policy.

-p, --die-with-parent
    Kill the entire sandbox when the launching process dies.

--parent-pid=PID
    Specifies the pid of the "parent" flatpak, used by --parent-expose-pids and --parent-share-pids.

--parent-expose-pids
    Make the processes of the new sandbox visible in the sandbox of the parent flatpak, as defined by --parent-pid.

--parent-share-pids
    Use the same process ID namespace for the processes of the new sandbox and the sandbox of the parent flatpak, as defined by --parent-pid. Implies --parent-expose-pids.

--instance-id-fd
    Write the instance ID string to the given file descriptor.

--file-forwarding
    If this option is specified, the remaining arguments are scanned, and all arguments that are enclosed between a pair of '@@' arguments are interpreted as file paths, exported in the document store, and passed to the command in the form of the resulting document path. Arguments between "@@u" and "@@" are considered URIs, and any "file:" URIs are exported. The exports are non-persistent and with read and write permissions for the application.

--app-path=PATH
    Instead of mounting the app's content on /app in the sandbox, mount PATH on /app, and the app's content on /run/parent/app. If the app has extensions, they will also be redirected into /run/parent/app, and will not be included in the LD_LIBRARY_PATH inside the sandbox.

--app-path=
    As a special case, --app-path= (with an empty PATH) results in an empty directory being mounted on /app.

--usr-path=PATH
    Instead of mounting the runtime's files on /usr in the sandbox, mount PATH on /usr, and the runtime's normal files on /run/parent/usr. If the runtime has extensions, they will also be redirected into /run/parent/usr, and will not be included in the LD_LIBRARY_PATH inside the sandbox.

    This option will usually only be useful if it is combined with --app-path= and --env=LD_LIBRARY_PATH=....

EXAMPLES

$ flatpak run org.gnome.gedit

$ flatpak run --devel --command=bash org.gnome.Builder

$ flatpak run --command=bash org.gnome.Sdk

$ flatpak run org.gnome.Boxes --nousb=0fd9:*

SEE ALSO

flatpak(1), flatpak-override(1), flatpak-enter(1)

NOTES

1.  os-release specification
    https://www.freedesktop.org/software/systemd/man/os-release.html