[SOLVED]Errori di compilazione VirtualBox su Current
Inviato: mer 28 ago 2019, 16:15
Da diversi giorni non riuscivo più a installare le nuove versioni di VBox a causa di un errore durante la compilazione. Non so se altri hanno avuto lo stesso problema o potrebbero eventualmente incontrarlo. L'errore è generato da un formato errato di 32 variabili integer che invece sono richiamate come stringhe in uno dei file sorgenti.
Non riuscendo a risolvere mi sono rivolto ieri al forum ufficiale di VirtualBox e in tempi rapidissimi un utente dello staff di Oracle (gentilissimo!), mi ha dato oggi la soluzione al problema; per chi fosse interessato l'indirizzo è questo: https://forums.virtualbox.org/viewtopic ... 10&t=94467
Per chi usasse lo slackbuild del repository di Ponce faccio presente che lo Slackbuild è pienamente compatibile con le versioni più recenti (attualmente la 6.0.10) con i seguenti adattamenti:
1) il testo della patch vboxdrv.sh-setup.diff va adattato sostituendolo con il seguente:
2) Il testo della patch 006-rdesktop-vrdp-keymap-path.patch va adattato sostituendo il seguente:
(in sostanza non cambia nulla, semplicemente nei nuovi sorgenti il file Makefile.kmk da patchare si trova nella directory client-1.8.4 invece della directory client-1.8.3 com'era riportato nei sorgenti delle vecchie release)
3) la patch python_3.7.patch non va più applicata (il codice nelle nuove versioni è già patchato)
4) va aggiunta la patch di cui dicevo, questo è il testo:
Nello slackbuild si può inserire la seguente riga:
dove ovviamente vbox-cpuhoplug.dsl.patch è il nome che ho dato al file della patch
Questo è quanto
Non riuscendo a risolvere mi sono rivolto ieri al forum ufficiale di VirtualBox e in tempi rapidissimi un utente dello staff di Oracle (gentilissimo!), mi ha dato oggi la soluzione al problema; per chi fosse interessato l'indirizzo è questo: https://forums.virtualbox.org/viewtopic ... 10&t=94467
Per chi usasse lo slackbuild del repository di Ponce faccio presente che lo Slackbuild è pienamente compatibile con le versioni più recenti (attualmente la 6.0.10) con i seguenti adattamenti:
1) il testo della patch vboxdrv.sh-setup.diff va adattato sostituendolo con il seguente:
Codice: Seleziona tutto
--- "VirtualBox-6 1.0.10-orig/src/VBox/Installer/linux/vboxdrv.sh" 2019-07-12 10:38:23.000000000 +0200
+++ "VirtualBox-6 1.0.10/src/VBox/Installer/linux/vboxdrv.sh" 2019-08-27 09:27:29.062734204 +0200
@@ -61,23 +61,8 @@ export BUILD_TYPE
export USERNAME
export USER=$USERNAME
-if test -n "${INSTALL_DIR}" && test -x "${INSTALL_DIR}/VirtualBox"; then
- MODULE_SRC="${INSTALL_DIR}/src/vboxhost"
-elif test -x /usr/lib/virtualbox/VirtualBox; then
- INSTALL_DIR=/usr/lib/virtualbox
- MODULE_SRC="/usr/share/virtualbox/src/vboxhost"
-elif test -x "${SCRIPT_DIR}/VirtualBox"; then
- # Executing from the build directory
- INSTALL_DIR="${SCRIPT_DIR}"
- MODULE_SRC="${INSTALL_DIR}/src"
-else
- # Silently exit if the package was uninstalled but not purged.
- # Applies to Debian packages only (but shouldn't hurt elsewhere)
- exit 0
-fi
VIRTUALBOX="${INSTALL_DIR}/VirtualBox"
VBOXMANAGE="${INSTALL_DIR}/VBoxManage"
-BUILDINTMP="${MODULE_SRC}/build_in_tmp"
if test -u "${VIRTUALBOX}"; then
GROUP=root
DEVICE_MODE=0600
@@ -152,117 +137,6 @@ module_build_log()
>> "${LOG}"
}
-## Output the vboxdrv part of our udev rule. This is redirected to the right file.
-udev_write_vboxdrv() {
- VBOXDRV_GRP="$1"
- VBOXDRV_MODE="$2"
-
- echo "KERNEL==\"vboxdrv\", NAME=\"vboxdrv\", OWNER=\"root\", GROUP=\"$VBOXDRV_GRP\", MODE=\"$VBOXDRV_MODE\""
- echo "KERNEL==\"vboxdrvu\", NAME=\"vboxdrvu\", OWNER=\"root\", GROUP=\"root\", MODE=\"0666\""
- echo "KERNEL==\"vboxnetctl\", NAME=\"vboxnetctl\", OWNER=\"root\", GROUP=\"$VBOXDRV_GRP\", MODE=\"$VBOXDRV_MODE\""
-}
-
-## Output the USB part of our udev rule. This is redirected to the right file.
-udev_write_usb() {
- INSTALLATION_DIR="$1"
- USB_GROUP="$2"
-
- echo "SUBSYSTEM==\"usb_device\", ACTION==\"add\", RUN+=\"$INSTALLATION_DIR/VBoxCreateUSBNode.sh \$major \$minor \$attr{bDeviceClass}${USB_GROUP}\""
- echo "SUBSYSTEM==\"usb\", ACTION==\"add\", ENV{DEVTYPE}==\"usb_device\", RUN+=\"$INSTALLATION_DIR/VBoxCreateUSBNode.sh \$major \$minor \$attr{bDeviceClass}${USB_GROUP}\""
- echo "SUBSYSTEM==\"usb_device\", ACTION==\"remove\", RUN+=\"$INSTALLATION_DIR/VBoxCreateUSBNode.sh --remove \$major \$minor\""
- echo "SUBSYSTEM==\"usb\", ACTION==\"remove\", ENV{DEVTYPE}==\"usb_device\", RUN+=\"$INSTALLATION_DIR/VBoxCreateUSBNode.sh --remove \$major \$minor\""
-}
-
-## Generate our udev rule file. This takes a change in udev rule syntax in
-## version 55 into account. It only creates rules for USB for udev versions
-## recent enough to support USB device nodes.
-generate_udev_rule() {
- VBOXDRV_GRP="$1" # The group owning the vboxdrv device
- VBOXDRV_MODE="$2" # The access mode for the vboxdrv device
- INSTALLATION_DIR="$3" # The directory VirtualBox is installed in
- USB_GROUP="$4" # The group that has permission to access USB devices
- NO_INSTALL="$5" # Set this to "1" to remove but not re-install rules
-
- # Extra space!
- case "$USB_GROUP" in ?*) USB_GROUP=" $USB_GROUP" ;; esac
- case "$NO_INSTALL" in "1") return ;; esac
- udev_write_vboxdrv "$VBOXDRV_GRP" "$VBOXDRV_MODE"
- udev_write_usb "$INSTALLATION_DIR" "$USB_GROUP"
-}
-
-## Install udev rule (disable with INSTALL_NO_UDEV=1 in
-## /etc/default/virtualbox).
-install_udev() {
- VBOXDRV_GRP="$1" # The group owning the vboxdrv device
- VBOXDRV_MODE="$2" # The access mode for the vboxdrv device
- INSTALLATION_DIR="$3" # The directory VirtualBox is installed in
- USB_GROUP="$4" # The group that has permission to access USB devices
- NO_INSTALL="$5" # Set this to "1" to remove but not re-install rules
-
- if test -d /etc/udev/rules.d; then
- generate_udev_rule "$VBOXDRV_GRP" "$VBOXDRV_MODE" "$INSTALLATION_DIR" \
- "$USB_GROUP" "$NO_INSTALL"
- fi
- # Remove old udev description file
- rm -f /etc/udev/rules.d/10-vboxdrv.rules 2> /dev/null
-}
-
-## Create a usb device node for a given sysfs path to a USB device.
-install_create_usb_node_for_sysfs() {
- path="$1" # sysfs path for the device
- usb_createnode="$2" # Path to the USB device node creation script
- usb_group="$3" # The group to give ownership of the node to
- if test -r "${path}/dev"; then
- dev="`cat "${path}/dev" 2> /dev/null`"
- major="`expr "$dev" : '\(.*\):' 2> /dev/null`"
- minor="`expr "$dev" : '.*:\(.*\)' 2> /dev/null`"
- class="`cat ${path}/bDeviceClass 2> /dev/null`"
- sh "${usb_createnode}" "$major" "$minor" "$class" \
- "${usb_group}" 2>/dev/null
- fi
-}
-
-udev_rule_file=/etc/udev/rules.d/60-vboxdrv.rules
-sysfs_usb_devices="/sys/bus/usb/devices/*"
-
-## Install udev rules and create device nodes for usb access
-setup_usb() {
- VBOXDRV_GRP="$1" # The group that should own /dev/vboxdrv
- VBOXDRV_MODE="$2" # The mode to be used for /dev/vboxdrv
- INSTALLATION_DIR="$3" # The directory VirtualBox is installed in
- USB_GROUP="$4" # The group that should own the /dev/vboxusb device
- # nodes unless INSTALL_NO_GROUP=1 in
- # /etc/default/virtualbox. Optional.
- usb_createnode="$INSTALLATION_DIR/VBoxCreateUSBNode.sh"
- # install udev rule (disable with INSTALL_NO_UDEV=1 in
- # /etc/default/virtualbox)
- if [ "$INSTALL_NO_GROUP" != "1" ]; then
- usb_group=$USB_GROUP
- vboxdrv_group=$VBOXDRV_GRP
- else
- usb_group=root
- vboxdrv_group=root
- fi
- install_udev "${vboxdrv_group}" "$VBOXDRV_MODE" \
- "$INSTALLATION_DIR" "${usb_group}" \
- "$INSTALL_NO_UDEV" > ${udev_rule_file}
- # Build our device tree
- for i in ${sysfs_usb_devices}; do # This line intentionally without quotes.
- install_create_usb_node_for_sysfs "$i" "${usb_createnode}" \
- "${usb_group}"
- done
-}
-
-cleanup_usb()
-{
- # Remove udev description file
- rm -f /etc/udev/rules.d/60-vboxdrv.rules
- rm -f /etc/udev/rules.d/10-vboxdrv.rules
-
- # Remove our USB device tree
- rm -rf /dev/vboxusb
-}
-
start()
{
begin_messaggio "Starting VirtualBox services" console
@@ -334,8 +208,6 @@ See the documenatation for your Linux di
mkdir -p -m 0750 /dev/vboxusb 2>/dev/null
chown root:vboxusers /dev/vboxusb 2>/dev/null
fi
- # Remove any kernel modules left over from previously installed kernels.
- cleanup only_old
succ_messaggio "VirtualBox services started"
}
@@ -416,80 +288,9 @@ stop_vms()
fi
}
-cleanup()
-{
- # If this is set, only remove kernel modules for no longer installed
- # kernels. Note that only generated kernel modules should be placed
- # in /lib/modules/*/misc. Anything that we should not remove automatically
- # should go elsewhere.
- only_old="${1}"
- for i in /lib/modules/*; do
- # Check whether we are only cleaning up for uninstalled kernels.
- test -n "${only_old}" && test -e "${i}/kernel/drivers" && continue
- # We could just do "rm -f", but we only want to try deleting folders if
- # we are sure they were ours, i.e. they had our modules in beforehand.
- if test -e "${i}/misc/vboxdrv.ko" \
- || test -e "${i}/misc/vboxnetadp.ko" \
- || test -e "${i}/misc/vboxnetflt.ko" \
- || test -e "${i}/misc/vboxpci.ko"; then
- rm -f "${i}/misc/vboxdrv.ko" "${i}/misc/vboxnetadp.ko" \
- "${i}/misc/vboxnetflt.ko" "${i}/misc/vboxpci.ko"
- version=`expr "${i}" : "/lib/modules/\(.*\)"`
- depmod -a "${version}"
- sync
- fi
- # Remove the kernel version folder if it was empty except for us.
- test "`echo ${i}/misc/* ${i}/misc/.?* ${i}/* ${i}/.?*`" \
- = "${i}/misc/* ${i}/misc/.. ${i}/misc ${i}/.." &&
- rmdir "${i}/misc" "${i}" # We used to leave empty folders.
- done
-}
-
# setup_script
setup()
{
- begin_messaggio "Building VirtualBox kernel modules" console
- log "Building the main VirtualBox module."
- if ! myerr=`$BUILDINTMP \
- --save-module-symvers /tmp/vboxdrv-Module.symvers \
- --module-source "$MODULE_SRC/vboxdrv" \
- --no-print-directory install 2>&1`; then
- "${INSTALL_DIR}/check_module_dependencies.sh" || exit 1
- log "Error building the module:"
- module_build_log "$myerr"
- failure "Look at $LOG to find out what went wrong"
- fi
- log "Building the net filter module."
- if ! myerr=`$BUILDINTMP \
- --use-module-symvers /tmp/vboxdrv-Module.symvers \
- --module-source "$MODULE_SRC/vboxnetflt" \
- --no-print-directory install 2>&1`; then
- log "Error building the module:"
- module_build_log "$myerr"
- failure "Look at $LOG to find out what went wrong"
- fi
- log "Building the net adaptor module."
- if ! myerr=`$BUILDINTMP \
- --use-module-symvers /tmp/vboxdrv-Module.symvers \
- --module-source "$MODULE_SRC/vboxnetadp" \
- --no-print-directory install 2>&1`; then
- log "Error building the module:"
- module_build_log "$myerr"
- failure "Look at $LOG to find out what went wrong"
- fi
- log "Building the PCI pass-through module."
- if ! myerr=`$BUILDINTMP \
- --use-module-symvers /tmp/vboxdrv-Module.symvers \
- --module-source "$MODULE_SRC/vboxpci" \
- --no-print-directory install 2>&1`; then
- log "Error building the module:"
- module_build_log "$myerr"
- failure "Look at $LOG to find out what went wrong"
- fi
- rm -f /etc/vbox/module_not_compiled
- depmod -a
- sync
- succ_messaggio "VirtualBox kernel modules built"
# Secure boot on Ubuntu and Debian.
if test -n "$HAVE_SEC_BOOT" &&
type update-secureboot-policy >/dev/null 2>&1; then
@@ -510,6 +311,7 @@ setup()
begin_messaggio "Failed to enroll secure boot key." console
rmdir -p /var/lib/dkms/vbox-temp 2>/dev/null
fi
+ echo "Not implemented! Please use the virtualbox-kernel.SlackBuild available at SlackBuilds.org instead."
}
dmnstatus()
@@ -566,13 +368,7 @@ setup)
## todo Do we need a udev rule to create /dev/vboxdrv[u] at all? We have
## working fall-back code here anyway, and the "right" code is more complex
## than the fall-back. Unnecessary duplication?
- stop && cleanup
- setup_usb "$GROUP" "$DEVICE_MODE" "$INSTALL_DIR"
- start
- ;;
-cleanup)
- stop && cleanup
- cleanup_usb
+setup
;;
force-reload)
stop
Codice: Seleziona tutto
--- "VirtualBox-6 1.0.10-orig/src/VBox/RDP/client-1.8.4/Makefile.kmk" 2019-07-12 10:38:36.000000000 +0200
+++ "VirtualBox-6 1.0.10/src/VBox/RDP/client-1.8.4/Makefile.kmk" 2019-08-27 09:36:24.194721175 +0200
@@ -41,7 +41,7 @@ rdesktop-vrdp_DEFS = \
EGD_SOCKET=\"/var/run/egd-pool\" WITH_RDPSND=1 HAVE_DIRENT_H=1 \
HAVE_ICONV=1 HAVE_SYS_STATVFS_H=1 \
HAVE_SYS_PARAM_H=1 HAVE_SYS_MOUNT_H=1 HAVE_STRUCT_STATVFS_F_NAMEMAX=1 \
- KEYMAP_PATH=$(if $(findstring RTPATH_APP_PRIVATE,$(CDEFS)),RTPATH_APP_PRIVATE,\"/opt/VirtualBox\")\"/rdesktop-vrdp-keymaps\" \
+ KEYMAP_PATH=$(if $(findstring RTPATH_APP_PRIVATE,$(CDEFS)),RTPATH_APP_PRIVATE,\"/usr/share/virtualbox\")\"/rdesktop-vrdp-keymaps\" \
RDESKTOP=1
ifdef WITH_BIRD_VD_HACKS
rdesktop-vrdp_DEFS += WITH_BIRD_VD_HACKS
3) la patch python_3.7.patch non va più applicata (il codice nelle nuove versioni è già patchato)
4) va aggiunta la patch di cui dicevo, questo è il testo:
Codice: Seleziona tutto
--- "VirtualBox-6 1.0.10-orig/src/VBox/Devices/PC/vbox-cpuhotplug.dsl" 2019-08-28 14:37:51.872756997 +0200
+++ "VirtualBox-6 1.0.10/src/VBox/Devices/PC/vbox-cpuhotplug.dsl" 2019-08-28 14:38:58.122755384 +0200
@@ -95,38 +95,38 @@ DefinitionBlock ("SSDT-cpuhotplug.aml",
} \
} \
- GENERATE_CPU_OBJECT(0x00, SCK0, "SCKCPU0", CPU0, "SCK0-CPU0")
- GENERATE_CPU_OBJECT(0x01, SCK1, "SCKCPU1", CPU1, "SCK1-CPU0")
- GENERATE_CPU_OBJECT(0x02, SCK2, "SCKCPU2", CPU2, "SCK2-CPU0")
- GENERATE_CPU_OBJECT(0x03, SCK3, "SCKCPU3", CPU3, "SCK3-CPU0")
- GENERATE_CPU_OBJECT(0x04, SCK4, "SCKCPU4", CPU4, "SCK4-CPU0")
- GENERATE_CPU_OBJECT(0x05, SCK5, "SCKCPU5", CPU5, "SCK5-CPU0")
- GENERATE_CPU_OBJECT(0x06, SCK6, "SCKCPU6", CPU6, "SCK6-CPU0")
- GENERATE_CPU_OBJECT(0x07, SCK7, "SCKCPU7", CPU7, "SCK7-CPU0")
- GENERATE_CPU_OBJECT(0x08, SCK8, "SCKCPU8", CPU8, "SCK8-CPU0")
- GENERATE_CPU_OBJECT(0x09, SCK9, "SCKCPU9", CPU9, "SCK9-CPU0")
- GENERATE_CPU_OBJECT(0x0a, SCKA, "SCKCPUA", CPUA, "SCKA-CPU0")
- GENERATE_CPU_OBJECT(0x0b, SCKB, "SCKCPUB", CPUB, "SCKB-CPU0")
- GENERATE_CPU_OBJECT(0x0c, SCKC, "SCKCPUC", CPUC, "SCKC-CPU0")
- GENERATE_CPU_OBJECT(0x0d, SCKD, "SCKCPUD", CPUD, "SCKD-CPU0")
- GENERATE_CPU_OBJECT(0x0e, SCKE, "SCKCPUE", CPUE, "SCKE-CPU0")
- GENERATE_CPU_OBJECT(0x0f, SCKF, "SCKCPUF", CPUF, "SCKF-CPU0")
- GENERATE_CPU_OBJECT(0x10, SCKG, "SCKCPUG", CPUG, "SCKG-CPU0")
- GENERATE_CPU_OBJECT(0x11, SCKH, "SCKCPUH", CPUH, "SCKH-CPU0")
- GENERATE_CPU_OBJECT(0x12, SCKI, "SCKCPUI", CPUI, "SCKI-CPU0")
- GENERATE_CPU_OBJECT(0x13, SCKJ, "SCKCPUJ", CPUJ, "SCKJ-CPU0")
- GENERATE_CPU_OBJECT(0x14, SCKK, "SCKCPUK", CPUK, "SCKK-CPU0")
- GENERATE_CPU_OBJECT(0x15, SCKL, "SCKCPUL", CPUL, "SCKL-CPU0")
- GENERATE_CPU_OBJECT(0x16, SCKM, "SCKCPUM", CPUM, "SCKM-CPU0")
- GENERATE_CPU_OBJECT(0x17, SCKN, "SCKCPUN", CPUN, "SCKN-CPU0")
- GENERATE_CPU_OBJECT(0x18, SCKO, "SCKCPUO", CPUO, "SCKO-CPU0")
- GENERATE_CPU_OBJECT(0x19, SCKP, "SCKCPUP", CPUP, "SCKP-CPU0")
- GENERATE_CPU_OBJECT(0x1a, SCKQ, "SCKCPUQ", CPUQ, "SCKQ-CPU0")
- GENERATE_CPU_OBJECT(0x1b, SCKR, "SCKCPUR", CPUR, "SCKR-CPU0")
- GENERATE_CPU_OBJECT(0x1c, SCKS, "SCKCPUS", CPUS, "SCKS-CPU0")
- GENERATE_CPU_OBJECT(0x1d, SCKT, "SCKCPUT", CPUT, "SCKT-CPU0")
- GENERATE_CPU_OBJECT(0x1e, SCKU, "SCKCPUU", CPUU, "SCKU-CPU0")
- GENERATE_CPU_OBJECT(0x1f, SCKV, "SCKCPUV", CPUV, "SCKV-CPU0")
+ GENERATE_CPU_OBJECT(0x00, SCK0, "SCKCPU0", CPU0, 0)
+ GENERATE_CPU_OBJECT(0x01, SCK1, "SCKCPU1", CPU1, 1)
+ GENERATE_CPU_OBJECT(0x02, SCK2, "SCKCPU2", CPU2, 2)
+ GENERATE_CPU_OBJECT(0x03, SCK3, "SCKCPU3", CPU3, 3)
+ GENERATE_CPU_OBJECT(0x04, SCK4, "SCKCPU4", CPU4, 4)
+ GENERATE_CPU_OBJECT(0x05, SCK5, "SCKCPU5", CPU5, 5)
+ GENERATE_CPU_OBJECT(0x06, SCK6, "SCKCPU6", CPU6, 6)
+ GENERATE_CPU_OBJECT(0x07, SCK7, "SCKCPU7", CPU7, 7)
+ GENERATE_CPU_OBJECT(0x08, SCK8, "SCKCPU8", CPU8, 8)
+ GENERATE_CPU_OBJECT(0x09, SCK9, "SCKCPU9", CPU9, 9)
+ GENERATE_CPU_OBJECT(0x0a, SCKA, "SCKCPUA", CPUA, 10)
+ GENERATE_CPU_OBJECT(0x0b, SCKB, "SCKCPUB", CPUB, 11)
+ GENERATE_CPU_OBJECT(0x0c, SCKC, "SCKCPUC", CPUC, 12)
+ GENERATE_CPU_OBJECT(0x0d, SCKD, "SCKCPUD", CPUD, 13)
+ GENERATE_CPU_OBJECT(0x0e, SCKE, "SCKCPUE", CPUE, 14)
+ GENERATE_CPU_OBJECT(0x0f, SCKF, "SCKCPUF", CPUF, 15)
+ GENERATE_CPU_OBJECT(0x10, SCKG, "SCKCPUG", CPUG, 16)
+ GENERATE_CPU_OBJECT(0x11, SCKH, "SCKCPUH", CPUH, 17)
+ GENERATE_CPU_OBJECT(0x12, SCKI, "SCKCPUI", CPUI, 18)
+ GENERATE_CPU_OBJECT(0x13, SCKJ, "SCKCPUJ", CPUJ, 19)
+ GENERATE_CPU_OBJECT(0x14, SCKK, "SCKCPUK", CPUK, 20)
+ GENERATE_CPU_OBJECT(0x15, SCKL, "SCKCPUL", CPUL, 21)
+ GENERATE_CPU_OBJECT(0x16, SCKM, "SCKCPUM", CPUM, 22)
+ GENERATE_CPU_OBJECT(0x17, SCKN, "SCKCPUN", CPUN, 23)
+ GENERATE_CPU_OBJECT(0x18, SCKO, "SCKCPUO", CPUO, 24)
+ GENERATE_CPU_OBJECT(0x19, SCKP, "SCKCPUP", CPUP, 25)
+ GENERATE_CPU_OBJECT(0x1a, SCKQ, "SCKCPUQ", CPUQ, 26)
+ GENERATE_CPU_OBJECT(0x1b, SCKR, "SCKCPUR", CPUR, 27)
+ GENERATE_CPU_OBJECT(0x1c, SCKS, "SCKCPUS", CPUS, 28)
+ GENERATE_CPU_OBJECT(0x1d, SCKT, "SCKCPUT", CPUT, 29)
+ GENERATE_CPU_OBJECT(0x1e, SCKU, "SCKCPUU", CPUU, 30)
+ GENERATE_CPU_OBJECT(0x1f, SCKV, "SCKCPUV", CPUV, 31)
#undef GENERATE_CPU_OBJECT
}
Codice: Seleziona tutto
# Fix wrong variable formats in vbox-cpuhotplug.dsl
patch -p1 < $CWD/vbox-cpuhotplug.dsl.patch
Questo è quanto