Raspi2-3_GenImage Commit - r65:54acc1e70a3e · Collaboration Tremplin des Sciences

Added ENABLE_SPLITFS option to create distinct images for firmware and root partitions

Vincent Knecht -

r65:54acc1e70a3e

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README.md +8 0

             ##### `ENABLE_HARDNET`=false
             Enable IPv4/IPv6 network stack hardening settings.
+            ##### `ENABLE_SPLITFS`=false
+            Enable having root partition on an USB drive by creating two image files: one for the `/boot/firmware` mount point, and another for `/`.
             ##### `CHROOT_SCRIPTS`=""
             Path to a directory with scripts that should be run in the chroot before the image is finally built. Every executable file in this direcory is run in lexicographical order.
             bmaptool copy ./images/jessie/2015-12-13-debian-jessie.img /dev/mmcblk0
             dd bs=4M if=./images/jessie/2015-12-13-debian-jessie.img of=/dev/mmcblk0
             ```
+            If you have set `ENABLE_SPLITFS`, copy the `-frmw` image on the microSD card, then the `-root` one on the USB drive:
+            ```shell
+            bmaptool copy ./images/jessie/2015-12-13-debian-jessie-frmw.img /dev/mmcblk0
+            bmaptool copy ./images/jessie/2015-12-13-debian-jessie-root.img /dev/sdc
+            ```

rpi2-gen-image.sh +60 -16

               umount -l $R/dev/pts 2> /dev/null
               umount "$BUILDDIR/mount/boot/firmware" 2> /dev/null
               umount "$BUILDDIR/mount" 2> /dev/null
-              losetup -d "$EXT4_LOOP" 2> /dev/null
+              losetup -d "$ROOT_LOOP" 2> /dev/null
-              losetup -d "$VFAT_LOOP" 2> /dev/null
+              losetup -d "$FRMW_LOOP" 2> /dev/null
               trap - 0 1 2 3 6
             }
             ENABLE_FBTURBO=${ENABLE_FBTURBO:=false}
             ENABLE_HARDNET=${ENABLE_HARDNET:=false}
             ENABLE_IPTABLES=${ENABLE_IPTABLES:=false}
+            ENABLE_SPLITFS=${ENABLE_SPLITFS:=false}
             # Image chroot path
             R=${BUILDDIR}/chroot
             fi
             # Set up firmware boot cmdline
+            if [ "$ENABLE_SPLITFS" = true ] ; then
+              CMDLINE="dwc_otg.lpm_enable=0 root=/dev/sda1 rootfstype=ext4 rootflags=commit=100,data=writeback elevator=deadline rootwait net.ifnames=1 console=tty1"
+            else
               CMDLINE="dwc_otg.lpm_enable=0 root=/dev/mmcblk0p2 rootfstype=ext4 rootflags=commit=100,data=writeback elevator=deadline rootwait net.ifnames=1 console=tty1"
+            fi
             # Set up serial console support (if requested)
             if [ "$ENABLE_CONSOLE" = true ] ; then
             # Create default fstab
             install -o root -g root -m 644 files/fstab $R/etc/fstab
+            if [ "$ENABLE_SPLITFS" = true ] ; then
+              sed -i '/mmcblk0p2/sda1/' $R/etc/fstab
+            fi
             # Avoid swapping and increase cache sizes
             install -o root -g root -m 644 files/sysctl.d/81-rpi-vm.conf $R/etc/sysctl.d/81-rpi-vm.conf
             # Calculate the amount of needed 512 Byte sectors
             TABLE_SECTORS=$(expr 1 \* 1024 \* 1024 \/ 512)
-            BOOT_SECTORS=$(expr 64 \* 1024 \* 1024 \/ 512)
+            FRMW_SECTORS=$(expr 64 \* 1024 \* 1024 \/ 512)
-            ROOT_OFFSET=$(expr ${TABLE_SECTORS} + ${BOOT_SECTORS})
+            ROOT_OFFSET=$(expr ${TABLE_SECTORS} + ${FRMW_SECTORS})
             # The root partition is EXT4
             # This means more space than the actual used space of the chroot is used.
             ROOT_SECTORS=$(expr $(expr ${CHROOT_SIZE} + ${CHROOT_SIZE} \/ 100 \* 20) \* 1024 \/ 512)
             # Calculate required image size in 512 Byte sectors
-            IMAGE_SECTORS=$(expr ${TABLE_SECTORS} + ${BOOT_SECTORS} + ${ROOT_SECTORS})
+            IMAGE_SECTORS=$(expr ${TABLE_SECTORS} + ${FRMW_SECTORS} + ${ROOT_SECTORS})
             # Prepare date string for image file name
             DATE="$(date +%Y-%m-%d)"
             # Prepare image file
+            if [ "$ENABLE_SPLITFS" = true ] ; then
+              dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}-frmw.img" bs=512 count=${TABLE_SECTORS}
+              dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}-frmw.img" bs=512 count=0 seek=${FRMW_SECTORS}
+              dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}-root.img" bs=512 count=${TABLE_SECTORS}
+              dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}-root.img" bs=512 count=0 seek=${ROOT_SECTORS}
+              # Write partition tables
+              sfdisk -q -L -f "$BASEDIR/${DATE}-debian-${RELEASE}-frmw.img" <<EOM
+            unit: sectors
+: start=   ${TABLE_SECTORS}, size=   ${FRMW_SECTORS}, Id= c, bootable
+: start=                  0, size=                 0, Id= 0
+: start=                  0, size=                 0, Id= 0
+: start=                  0, size=                 0, Id= 0
+            EOM
+              sfdisk -q -L -f "$BASEDIR/${DATE}-debian-${RELEASE}-root.img" <<EOM
+            unit: sectors
+: start=   ${TABLE_SECTORS}, size=   ${ROOT_SECTORS}, Id=83
+: start=                  0, size=                 0, Id= 0
+: start=                  0, size=                 0, Id= 0
+: start=                  0, size=                 0, Id= 0
+            EOM
+              # Set up temporary loop devices and build filesystems
+              FRMW_LOOP="$(losetup -o 1M --sizelimit 64M -f --show $BASEDIR/${DATE}-debian-${RELEASE}-frmw.img)"
+              ROOT_LOOP="$(losetup -o 1M -f --show $BASEDIR/${DATE}-debian-${RELEASE}-root.img)"
+            else
               dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}.img" bs=512 count=${TABLE_SECTORS}
               dd if=/dev/zero of="$BASEDIR/${DATE}-debian-${RELEASE}.img" bs=512 count=0 seek=${IMAGE_SECTORS}
               # Write partition table
               sfdisk -q -f "$BASEDIR/${DATE}-debian-${RELEASE}.img" <<EOM
             unit: sectors
-: start=   ${TABLE_SECTORS}, size=   ${BOOT_SECTORS}, Id= c, bootable
+: start=   ${TABLE_SECTORS}, size=   ${FRMW_SECTORS}, Id= c, bootable
 : start=     ${ROOT_OFFSET}, size=   ${ROOT_SECTORS}, Id=83
 : start=                  0, size=                 0, Id= 0
 : start=                  0, size=                 0, Id= 0
             EOM
               # Set up temporary loop devices and build filesystems
-            VFAT_LOOP="$(losetup -o 1M --sizelimit 64M -f --show $BASEDIR/${DATE}-debian-${RELEASE}.img)"
+              FRMW_LOOP="$(losetup -o 1M --sizelimit 64M -f --show $BASEDIR/${DATE}-debian-${RELEASE}.img)"
-            EXT4_LOOP="$(losetup -o 65M -f --show $BASEDIR/${DATE}-debian-${RELEASE}.img)"
+              ROOT_LOOP="$(losetup -o 65M -f --show $BASEDIR/${DATE}-debian-${RELEASE}.img)"
-            mkfs.vfat "$VFAT_LOOP"
+            fi
-            mkfs.ext4 "$EXT4_LOOP"
+            mkfs.vfat "$FRMW_LOOP"
+            mkfs.ext4 "$ROOT_LOOP"
             # Mount the temporary loop devices
             mkdir -p "$BUILDDIR/mount"
-            mount "$EXT4_LOOP" "$BUILDDIR/mount"
+            mount "$ROOT_LOOP" "$BUILDDIR/mount"
             mkdir -p "$BUILDDIR/mount/boot/firmware"
-            mount "$VFAT_LOOP" "$BUILDDIR/mount/boot/firmware"
+            mount "$FRMW_LOOP" "$BUILDDIR/mount/boot/firmware"
             # Copy all files from the chroot to the loop device mount point directory
             rsync -a "$R/" "$BUILDDIR/mount/"
             # Unmount all temporary loop devices and mount points
             cleanup
-            # (optinal) create block map file for "bmaptool"
+            if [ "$ENABLE_SPLITFS" = true ] ; then
+              # (optional) create block map file for "bmaptool"
+              bmaptool create -o "$BASEDIR/${DATE}-debian-${RELEASE}-frmw.bmap" "$BASEDIR/${DATE}-debian-${RELEASE}-frmw.img"
+              bmaptool create -o "$BASEDIR/${DATE}-debian-${RELEASE}-root.bmap" "$BASEDIR/${DATE}-debian-${RELEASE}-root.img"
+              # Image was successfully created
+              echo "$BASEDIR/${DATE}-debian-${RELEASE}-frmw.img ($(expr ${TABLE_SECTORS} + ${FRMW_SECTORS} \* 512 \/ 1024)M)" ": successfully created"
+              echo "$BASEDIR/${DATE}-debian-${RELEASE}-root.img ($(expr ${TABLE_SECTORS} + ${ROOT_SECTORS} \* 512 \/ 1024)M)" ": successfully created"
+            else
+              # (optional) create block map file for "bmaptool"
               bmaptool create -o "$BASEDIR/${DATE}-debian-${RELEASE}.bmap" "$BASEDIR/${DATE}-debian-${RELEASE}.img"
               # Image was successfully created
-            echo "$BASEDIR/${DATE}-debian-${RELEASE}.img (${IMAGE_SIZE})" ": successfully created"
+              echo "$BASEDIR/${DATE}-debian-${RELEASE}.img ($(expr ${TABLE_SECTORS} + ${FRMW_SECTORS} + ${ROOT_SECTORS} \* 512 \/ 1024)M)" ": successfully created"
+            fi

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