def _get_snapshot_dir()

in antlir/nspawn_in_subvol/plugins/repo_plugins.py [0:0]

• 19 lines of code
• 8 McCabe index (conditional complexity)

def _get_snapshot_dir(opts: _NspawnOpts, plugin_args: NspawnPluginArgs):
    # Shadow RPM installers by default, when running as "root".  It is ugly
    # to condition this on "root", but in practice, it is a significant
    # costs savings for non-root runs -- no need to start repo servers and
    # shadow bind mounts that (`sudo` aside) would not get used.
    if (
        plugin_args.attach_antlir_dir != AttachAntlirDirMode.OFF
        and not opts.layer.path(ANTLIR_DIR).exists()
        and opts.subvolume_on_disk
        # pyre-fixme[16]: `SubvolumeOnDisk` has no attribute
        # `build_appliance_path`.
        and opts.subvolume_on_disk.build_appliance_path
    ):
        return (
            opts.subvolume_on_disk.build_appliance_path
            / RPM_DEFAULT_SNAPSHOT_FOR_INSTALLER_DIR.strip_leading_slashes()
        )

    if plugin_args.attach_antlir_dir == AttachAntlirDirMode.EXPLICIT_ON:
        raise AttachAntlirDirError(
            "ERROR: Could not attach /__antlir__ dir. Please "
            "check to make sure that you do not have an existing antlir "
            "directory in your image, and that the image has a "
            "discoverable build appliance (usually through its flavor)."
        )

    return opts.layer.path(RPM_DEFAULT_SNAPSHOT_FOR_INSTALLER_DIR)