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libvirt/meson_options.txt
Daniel P. Berrangé 3fff8c91b0 network: introduce a "none" firewall backend type 
There are two scenarios identified after the recent firewall backend
selection was introduced, which result in libvirtd failing to startup
due to an inability to find either iptables/nftables

 - On Linux if running unprivileged with $PATH lacking the dir
   containing iptables/nftables
 - On non-Linux where iptables/nftables never existed

In the former case, it is preferrable to restore the behaviour whereby
the driver starts successfully. Users will get an error reported when
attempting to start any virtual network, due to the lack of permissions
needed to create bridge devices. This makes the missing firewall backend
irrelevant.

In the latter case, the network driver calls the 'nop' platform
implementation which does not attempt to implement any firewall logic,
just allowing the network to start without firewall rules.

To solve this are number of changes are required

 * Introduce VIR_FIREWALL_BACKEND_NONE, which does nothing except
   report a fatal error from virFirewallApply(). This code path
   is unreachable, since we'll never create a virFirewall
   object with with VIR_FIREWALL_BACKEND_NONE, so the error reporting
   is just a sanity check.

 * Ignore the compile time backend defaults and assume use of
   the 'none' backend if running unprivileged.

   This fixes the first regression, avoiding the failure to start
   libvirtd on Linux in unprivileged context, instead allowing use
   of the driver and expecting a permission denied when creating a
   bridge.

 * Reject the use of compile time backend defaults no non-Linux
   and hardcode the 'none' backend. The non-Linux platforms have
   no firewall implementation at all currently, so there's no
   reason to permit the use of 'firewall_backend_priority'
   meson option.

   This fixes the second regression, avoiding the failure to start
   libvirtd on non-Linux hosts due to non-existant Linux binaries.

 * Change the Linux platform backend to raise an error if the
   firewall backend is 'none'. Again this code path is unreachable
   by default since we'll fail to create the bridge before getting
   here, but if someone modified network.conf to request the 'none'
   backend, this will stop further progress.

 * Change the nop platform backend to raise an error if the
   firewall backend is 'iptables' or 'nftables'. Again this code
   path is unreachable, since we should already have failed to
   find the iptables/nftables binaries on non-Linux hosts, so
   this is just a sanity check.

 * 'none' is not permited as a value in 'firewall_backend_priority'
   meson option, since it is conceptually meaningless to ask for
   that on Linux.

NB, 'firewall_backend_priority' allows repeated options temporarily,
which we don't want. Meson intends to turn this into a hard error

  DEPRECATION: Duplicated values in array option is deprecated. This will become a hard error in the future.

and we can live with the reduced error checking until that happens.

Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2024-06-17 15:55:14 +01:00

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option('no_git', type: 'boolean', value: false, description: 'Disable git submodule update')
option('packager', type: 'string', value: '', description: 'Extra packager name')
option('packager_version', type: 'string', value: '', description: 'Extra packager version')
option('system', type: 'boolean', value: false, description: 'Set install paths to system ones')
option('runstatedir', type: 'string', value: '', description: 'State directory for temporary sockets, pid files, etc')
option('initconfdir', type: 'string', value: '', description: 'directory for init script configuration files')
option('unitdir', type: 'string', value: '', description: 'directory for systemd unit files')
option('sysusersdir', type: 'string', value: '', description: 'directory for sysusers files')
# dep:tests
option('expensive_tests', type: 'feature', value: 'auto', description: 'set the default for enabling expensive tests (long timeouts)')
option('test_coverage', type: 'boolean', value: false, description: 'turn on code coverage instrumentation')
option('git_werror', type: 'feature', value: 'auto', description: 'use -Werror if building from GIT')
option('rpath', type: 'feature', value: 'auto', description: 'whether to include rpath information in installed binaries and libraries')
option('docdir', type: 'string', value: '', description: 'documentation installation directory')
option('docs', type: 'feature', value: 'auto', description: 'whether to generate documentation')
option('tests', type: 'feature', value: 'auto', description: 'whether to build and run tests')
# build dependencies options
option('apparmor', type: 'feature', value: 'auto', description: 'apparmor support')
option('attr', type: 'feature', value: 'auto', description: 'attr support')
option('audit', type: 'feature', value: 'auto', description: 'audit support')
# dep:readline
option('bash_completion', type: 'feature', value: 'auto', description: 'bash-completion support')
option('bash_completion_dir', type: 'string', value: '', description: 'directory containing bash completion scripts')
option('blkid', type: 'feature', value: 'auto', description: 'blkid support')
option('capng', type: 'feature', value: 'auto', description: 'cap-ng support')
option('curl', type: 'feature', value: 'auto', description: 'curl support')
option('fuse', type: 'feature', value: 'auto', description: 'fuse support')
option('glusterfs', type: 'feature', value: 'auto', description: 'glusterfs support')
option('libiscsi', type: 'feature', value: 'auto', description: 'libiscsi support')
option('libnl', type: 'feature', value: 'auto', description: 'libnl support')
option('libpcap', type: 'feature', value: 'auto', description: 'libpcap support')
option('libssh', type: 'feature', value: 'auto', description: 'libssh support')
option('libssh2', type: 'feature', value: 'auto', description: 'libssh2 support')
option('netcf', type: 'feature', value: 'auto', description: 'netcf support')
option('nls', type: 'feature', value: 'auto', description: 'nls support')
option('numactl', type: 'feature', value: 'auto', description: 'numactl support')
option('openwsman', type: 'feature', value: 'auto', description: 'openwsman support')
option('pciaccess', type: 'feature', value: 'auto', description: 'pciaccess support')
option('polkit', type: 'feature', value: 'auto', description: 'use PolicyKit for UNIX socket access checks')
option('readline', type: 'feature', value: 'auto', description: 'readline support')
option('sanlock', type: 'feature', value: 'auto', description: 'sanlock support')
option('sasl', type: 'feature', value: 'auto', description: 'sasl support')
option('selinux', type: 'feature', value: 'auto', description: 'selinux support')
option('selinux_mount', type: 'string', value: '', description: 'set SELinux mount point')
option('sshconfdir', type: 'string', value: '', description: 'directory for SSH client configuration')
# dep:pciaccess
option('udev', type: 'feature', value: 'auto', description: 'udev support')
# dep:driver_remote
option('wireshark_dissector', type: 'feature', value: 'auto', description: 'wireshark support')
option('wireshark_plugindir', type: 'string', value: '', description: 'wireshark plugins directory for use when installing wireshark plugin')
option('yajl', type: 'feature', value: 'auto', description: 'yajl support')
# build driver options
option('driver_bhyve', type: 'feature', value: 'auto', description: 'bhyve driver')
# dep:curl
option('driver_esx', type: 'feature', value: 'auto', description: 'esx driver')
# dep:openwsman
option('driver_hyperv', type: 'feature', value: 'auto', description: 'Hyper-V driver')
# dep:pciaccess dep:udev dep:driver_remote dep:driver_libvirtd
option('driver_interface', type: 'feature', value: 'auto', description: 'host interface driver')
# dep:driver_remote
option('driver_libvirtd', type: 'feature', value: 'auto', description: 'libvirtd driver')
# dep:driver_remote dep:driver_libvirtd
option('driver_libxl', type: 'feature', value: 'auto', description: 'libxenlight driver')
# dep:driver_remote dep:driver_libvirtd
option('driver_lxc', type: 'feature', value: 'auto', description: 'Linux Container driver')
# dep:curl dep:yajl dep:driver_remote dep:driver_libvirtd
option('driver_ch', type: 'feature', value: 'auto', description: 'Cloud-Hypervisor driver')
option('ch_user', type: 'string', value: '', description: 'username to run Cloud-Hypervisor system instance as')
option('ch_group', type: 'string', value: '', description: 'groupname to run Cloud-Hypervisor system instance as')
# dep:driver_remote dep:driver_libvirtd
option('driver_network', type: 'feature', value: 'auto', description: 'virtual network driver')
option('driver_openvz', type: 'feature', value: 'auto', description: 'OpenVZ driver')
# dep:yajl dep:driver_remote dep:driver_libvirtd
option('driver_qemu', type: 'feature', value: 'auto', description: 'QEMU/KVM driver')
option('qemu_user', type: 'string', value: '', description: 'username to run QEMU system instance as')
option('qemu_group', type: 'string', value: '', description: 'groupname to run QEMU system instance as')
option('qemu_moddir', type: 'string', value: '', description: 'set the directory where QEMU modules are located')
option('qemu_datadir', type: 'string', value: '', description: 'set the directory where QEMU shared data is located')
option('driver_remote', type: 'feature', value: 'auto', description: 'remote driver')
option('remote_default_mode', type: 'combo', choices: ['legacy', 'direct'], value: 'direct', description: 'remote driver default mode')
option('driver_secrets', type: 'feature', value: 'auto', description: 'local secrets management driver')
option('driver_test', type: 'feature', value: 'auto', description: 'test driver')
option('driver_vbox', type: 'feature', value: 'auto', description: 'VirtualBox XPCOMC driver')
option('vbox_xpcomc_dir', type: 'string', value: '', description: 'Location of directory containing VirtualBox XPCOMC library')
option('driver_vmware', type: 'feature', value: 'auto', description: 'VMware driver')
option('driver_vz', type: 'feature', value: 'auto', description: 'Virtuozzo driver')
option('secdriver_apparmor', type: 'feature', value: 'auto', description: 'use AppArmor security driver')
# dep:secdriver_apparmor
option('apparmor_profiles', type: 'feature', value: 'auto', description: 'install apparmor profiles')
# dep:selinux
option('secdriver_selinux', type: 'feature', value: 'auto', description: 'use SELinux security driver')
# storage driver options
option('storage_dir', type: 'feature', value: 'auto', description: 'directory backend for the storage driver')
option('storage_disk', type: 'feature', value: 'auto', description: 'GPartd Disk backend for the storage driver')
option('storage_fs', type: 'feature', value: 'auto', description: 'FileSystem backend for the storage driver')
option('storage_gluster', type: 'feature', value: 'auto', description: 'Gluster backend for the storage driver')
option('storage_iscsi', type: 'feature', value: 'auto', description: 'iscsi backend for the storage driver')
option('storage_iscsi_direct', type: 'feature', value: 'auto', description: 'iscsi-direct backend for the storage driver')
option('storage_lvm', type: 'feature', value: 'auto', description: 'LVM backend for the storage driver')
option('storage_mpath', type: 'feature', value: 'auto', description: 'mpath backend for the storage driver')
option('storage_rbd', type: 'feature', value: 'auto', description: 'RADOS Block Device backend for the storage driver')
option('storage_scsi', type: 'feature', value: 'auto', description: 'SCSI backend for the storage driver')
option('storage_vstorage', type: 'feature', value: 'auto', description: 'Virtuozzo storage backend for the storage driver')
option('storage_zfs', type: 'feature', value: 'auto', description: 'ZFS backend for the storage driver')
# build feature options
option('chrdev_lock_files', type: 'string', value: '', description: 'location for UUCP style lock files for character devices (leave empty for default paths on some platforms)')
option('dtrace', type: 'feature', value: 'auto', description: 'use dtrace for static probing')
option('firewalld', type: 'feature', value: 'auto', description: 'firewalld support')
# dep:firewalld
option('firewalld_zone', type: 'feature', value: 'auto', description: 'whether to install firewalld libvirt zone')
option('firewall_backend_priority', type: 'array', choices: ['nftables', 'iptables'], value: [], description: 'order in which to try firewall backends')
option('host_validate', type: 'feature', value: 'auto', description: 'build virt-host-validate')
option('init_script', type: 'combo', choices: ['systemd', 'openrc', 'check', 'none'], value: 'check', description: 'Style of init script to install')
option('loader_nvram', type: 'string', value: '', description: 'Pass list of pairs of <loader>:<nvram> paths. Both pairs and list items are separated by a colon.')
option('login_shell', type: 'feature', value: 'auto', description: 'build virt-login-shell')
# dep:yajl dep:driver_network dep:libvirtd
option('nss', type: 'feature', value: 'auto', description: 'enable Name Service Switch plugin for resolving guest IP addresses')
# dep:numactl
option('numad', type: 'feature', value: 'auto', description: 'use numad to manage CPU placement dynamically')
option('nbdkit', type: 'feature', value: 'auto', description: 'Build nbdkit storage backend')
# dep:nbdkit
option('nbdkit_config_default', type: 'feature', value: 'auto', description: 'Whether to use nbdkit storage backend for network disks by default (configurable)')
option('pm_utils', type: 'feature', value: 'auto', description: 'use pm-utils for power management')
option('ssh_proxy', type: 'feature', value: 'auto', description: 'Build ssh-proxy for ssh over vsock')
option('sysctl_config', type: 'feature', value: 'auto', description: 'Whether to install sysctl configs')
# dep:sysctl_config
option('userfaultfd_sysctl', type: 'feature', value: 'auto', description: 'Whether to install sysctl config for enabling unprivileged userfaultfd')
option('tls_priority', type: 'string', value: 'NORMAL', description: 'set the default TLS session priority string')
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