Patchwork [CONSOLIDATED,PULL,(for,RC3),2/5] initrdscripts: fix init-live.sh and use unionfs

From: Yang Shi <yang.shi@windriver.com>

[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.shi@windriver.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(-)

On Tue, 2012-04-10 at 18:33 -0700, Saul Wold wrote:
> From: Yang Shi <yang.shi@windriver.com>
> 
> [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.shi@windriver.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
>  }

Sadly, virtual/kernel is a machine specific dependency so we need to
remove the allarch inherit from the recipe and mark it as machine
specific too.

Cheers,

Richard