On 04/09/2012 03:15 PM, Yang Shi wrote: > [YOCTO #1487] > > When booting up with liveCD image, init scripts can't work well on read-only > filesystem. Unionfs, > which is supported in Yocto kernel, allows a filesystem to appear as > writeable, but without > actually allowing writes to change the filesystem. > > Use unionfs to mount rootfs and make root file system can be writen when > using liveCD to boot up. > Set UNION_FS variable depending on kernel config, so that it can work with > kernel which doesn't > have unionfs feature. > > Signed-off-by: Yang Shi <yang....@windriver.com>
Acked-by: Darren Hart <dvh...@linux.intel.com> > --- > meta/recipes-core/initrdscripts/files/init-live.sh | 23 ++++++++++++++++--- > .../initrdscripts/initramfs-live-boot_1.0.bb | 9 +++++++- > 2 files changed, 27 insertions(+), 5 deletions(-) > > diff --git a/meta/recipes-core/initrdscripts/files/init-live.sh > b/meta/recipes-core/initrdscripts/files/init-live.sh > index eb5ab5b..737dae4 100644 > --- a/meta/recipes-core/initrdscripts/files/init-live.sh > +++ b/meta/recipes-core/initrdscripts/files/init-live.sh > @@ -7,6 +7,7 @@ ROOT_IMAGE="rootfs.img" > MOUNT="/bin/mount" > UMOUNT="/bin/umount" > ISOLINUX="" > +UNIONFS="no" > > early_setup() { > mkdir /proc > @@ -89,17 +90,31 @@ case $label in > mkdir $ROOT_MOUNT > mknod /dev/loop0 b 7 0 2>/dev/null > > - if ! $MOUNT -o rw,loop,noatime,nodiratime > /media/$i/$ISOLINUX/$ROOT_IMAGE $ROOT_MOUNT ; then > - fatal "Couldnt mount rootfs image" > + > + if [ "$UNIONFS" = "yes" ]; then > + mkdir /rootfs-tmp > + > + if ! $MOUNT -o rw,loop,noatime,nodiratime > /media/$i/$ISOLINUX/$ROOT_IMAGE /rootfs-tmp ; then > + fatal "Could not mount rootfs image" > + else > + mkdir /cow > + mount -t tmpfs -o rw,noatime,mode=755 tmpfs /cow > + mount -t unionfs -o dirs=/cow:/rootfs-tmp=ro unionfs $ROOT_MOUNT > + boot_live_root > + fi > else > - boot_live_root > + if ! $MOUNT -o rw,loop,noatime,nodiratime > /media/$i/$ISOLINUX/$ROOT_IMAGE $ROOT_MOUNT ; then > + fatal "Could not mount rootfs image" > + else > + boot_live_root > + fi > fi > ;; > install) > if [ -f /media/$i/$ISOLINUX/$ROOT_IMAGE ] ; then > ./install.sh $i/$ISOLINUX $ROOT_IMAGE $video_mode $vga_mode > else > - fatal "Couldnt find install script" > + fatal "Could not find install script" > fi > > # If we're getting here, we failed... > diff --git a/meta/recipes-core/initrdscripts/initramfs-live-boot_1.0.bb > b/meta/recipes-core/initrdscripts/initramfs-live-boot_1.0.bb > index e85a0e1..f7f0c9d 100644 > --- a/meta/recipes-core/initrdscripts/initramfs-live-boot_1.0.bb > +++ b/meta/recipes-core/initrdscripts/initramfs-live-boot_1.0.bb > @@ -2,10 +2,17 @@ DESCRIPTION = "A live image init script" > LICENSE = "MIT" > LIC_FILES_CHKSUM = > "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420" > RDEPENDS = "udev" > +DEPENDS = "virtual/kernel" > SRC_URI = "file://init-live.sh" > > -PR = "r7" > +PR = "r8" > > +do_compile() { > + if grep -q "CONFIG_UNION_FS=y" ${STAGING_KERNEL_DIR}/.config; then > + sed -i 's/UNIONFS="no"/UNIONFS="yes"/g' ${WORKDIR}/init-live.sh > + fi > +} > + > do_install() { > install -m 0755 ${WORKDIR}/init-live.sh ${D}/init > } -- Darren Hart Intel Open Source Technology Center Yocto Project - Linux Kernel _______________________________________________ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto