Environment Variables

When running fwupd reads some variables from your environment and changes some behavior. This might be useful for debugging, or to make fwupd run somewhere with a non-standard filesystem layout.

fwupdmgr and fwupdtool

  • DISABLE_SSL_STRICT disables strict SSL certificate checking, which may make downloading files work when using some antisocial corporate firewalls.
  • FWUPD_CURL_VERBOSE shows more information when downloading files
  • FWUPD_SUPPORTED overrides the -Dsupported_build meson option at runtime
  • FWUPD_VERBOSE is set when running --verbose
  • FWUPD_XMLB_VERBOSE can be set to show Xmlb silo regeneration and quirk matches
  • FWUPD_DBUS_SOCKET is used to set the socket filename if running without a dbus-daemon
  • FWUPD_PROFILE can be used to set the profile traceback threshold value in ms
  • FWUPD_EFIVARS can be set to dummy to emulate an EFI variable store
  • FWUPD_FUZZER_RUNNING if the firmware format is being fuzzed
  • FWUPD_POLKIT_NOCHECK if we should not check for polkit policies to be installed
  • standard glibc variables like LANG are also honored for CLI tools that are translated
  • libcurl respects the session proxy, e.g. http_proxy, all_proxy, sftp_proxy and no_proxy

daemon

  • FWUPD_MACHINE_KIND can be used to override the detected machine type, e.g. physical, virtual, or container
  • FWUPD_HOST_EMULATE can be used to load test data from /usr/share/fwupd/host-emulate.d, e.g. thinkpad-p1-no-iommu.json.gz
  • FWUPD_SYSCALL_FILTER can be set to the name of the service manager if syscalls are being filtered, e.g. systemd.

Self Tests

  • CI_NETWORK if CI is running with network access
  • TPM_SERVER_RUNNING if an emulated TPM is running
  • UMOCKDEV_DIR if set, running under umockdev

Other variables, include:

  • FWUPD_DELL_FAKE_SMBIOS if set, use fake SMBIOS information for tests
  • FWUPD_FORCE_TPM2 ignores a TPM 1.2 device detected in the TPM self tests
  • FWUPD_REDFISH_SELF_TEST if set, do destructive tests on the actual device BMC
  • FWUPD_REDFISH_SMBIOS_DATA use this filename to emulate a specific SMBIOS blob
  • FWUPD_SOLOKEY_EMULATE emulates a fake device for testing
  • FWUPD_UEFI_TEST used by the UEFI plugins to disable specific sanity checks during self tests
  • FWUPD_MACHINE_ID used by the tests to set a predictable hash normally loaded from /etc/machine-id

File system overrides

These are not fully documented here, see https://github.com/fwupd/fwupd/blob/main/libfwupdplugin/fu-common.c for details.

  • CACHE_DIRECTORY
  • CONFIGURATION_DIRECTORY
  • FWUPD_ACPITABLESDIR
  • FWUPD_DATADIR
  • FWUPD_DATADIR_QUIRKS
  • FWUPD_DATADIR_VENDOR_IDS
  • FWUPD_EFIAPPDIR
  • FWUPD_FIRMWARESEARCH
  • FWUPD_HOSTDIR looks for host OS os-release in this sysroot, default is /
  • FWUPD_LIBDIR_PKG
  • FWUPD_LOCALSTATEDIR
  • FWUPD_LOCALSTATEDIR_QUIRKS
  • FWUPD_PROCFS
  • FWUPD_SYSCONFDIR
  • FWUPD_SYSFSDMIDIR
  • FWUPD_SYSFSDRIVERDIR
  • FWUPD_SYSFSFWATTRIBDIR
  • FWUPD_SYSFSFWDIR
  • FWUPD_SYSFSSECURITYDIR
  • FWUPD_SYSFSTPMDIR
  • FWUPD_LOCKDIR
  • FWUPD_UEFI_ESP_PATH
  • HOME
  • RUNTIME_DIRECTORY
  • SNAP
  • SNAP_USER_DATA
  • STATE_DIRECTORY