[yocto] Live images?

[Gary Thomas]

On 2014-06-05 11:24, Paul Eggleton wrote:
> On Thursday 05 June 2014 11:16:55 Gary Thomas wrote:
>> On 2014-06-05 09:07, Paul Eggleton wrote:
>>> On Thursday 05 June 2014 08:41:57 Gary Thomas wrote:
>>>> On 2014-06-05 08:32, Paul Eggleton wrote:
>>>>> On Thursday 05 June 2014 15:26:28 Paul Eggleton wrote:
>>>>>> Hi Gary,
>>>>>>
>>>>>> On Thursday 05 June 2014 07:07:34 Gary Thomas wrote:
>>>>>>> Looking through the Poky/Yocto sources, there seems to be
>>>>>>> some support for Live CD/USB images.  However, I can't find
>>>>>>> any examples nor documentation for how to use this.
>>>>>>>
>>>>>>> Can anyone provide some pointers?
>>>>>>
>>>>>> You're right, we seem to be missing that in our documentation; I'm not
>>>>>> sure
>>>>>> where the best place to document it would be though.
>>>>>>
>>>>>> FYI, you should just need to ensure "live" is in IMAGE_FSTYPES; then
>>>>>> you
>>>>>> should get a .directdisk image that you can just dd to a USB stick.
>>>>>
>>>>> Of course I meant to say .hddimg, not .directdisk.
>>>>
>>>> Thanks, I'll give that a try.
>>>>
>>>> What if I needed to boot from an actual CD?  I have an old
>>>> box here I'd like to try, but it doesn't boot from USB.
>>>
>>> We can produce ISO images but I don't think that they work quite as well,
>>> e.g.:
>>>
>>> https://bugzilla.yoctoproject.org/show_bug.cgi?id=5282
>>>
>>> You could always try it though.
>>
>> Bummer, when I tried to build core-image-minimal and/or core-image-x11, it
> failed:
>> | DEBUG: Executing shell function read_only_rootfs_hook
>> | sed: can't read
>> | /home/local/x86_live_2014-06-05/tmp/work/genericx86-poky-linux/core-image
>> | -minimal-initramfs/1.0-r0/rootfs/etc/fstab: No such file or directory
>> | WARNING:
>> | /home/local/x86_live_2014-06-05/tmp/work/genericx86-poky-linux/core-image
>> | -minimal-initramfs/1.0-r0/temp/run.read_only_rootfs_hook.30446:1 exit 2
>> | from|
>> |   sed -i -e
>> |   '/^[#[:space:]]*\/dev\/root/{s/defaults/ro/;s/\([[:space:]]*[[:digit:]]
>> |   \)\([[:space:]]*\)[[:digit:]]$/\1\20/}'
>> /home/local/x86_live_2014-06-05/tmp/work/genericx86-poky-linux/core-image-mi
>> nimal-initramfs/1.0-r0/rootfs/etc/fstab
>> | DEBUG: Python function do_rootfs finished
>> | ERROR: Function failed: read_only_rootfs_hook (log file is located at
>>
>> /home/local/x86_live_2014-06-05/tmp/work/genericx86-poky-linux/core-image-mi
>> nimal-initramfs/1.0-r0/temp/log.do_rootfs.30446)
>>
>> Using these settings:
>> Build Configuration:
>> BB_VERSION        = "1.23.1"
>> BUILD_SYS         = "i686-linux"
>> NATIVELSBSTRING   = "Fedora-13"
>> TARGET_SYS        = "i586-poky-linux"
>> MACHINE           = "genericx86"
>> DISTRO            = "poky"
>> DISTRO_VERSION    = "1.6+snapshot-20140605"
>> TUNE_FEATURES     = "m32 core2"
>> TARGET_FPU        = ""
>> meta
>> meta-yocto
>> meta-yocto-bsp    = "master:e7114046be6e71fb326477dc882adb814ef6a751"
>>
>> Extra settings in conf/local.conf
>> # Live CD setup
>> IMAGE_FSTYPES_append = " hddimg live"
>
> "hddimg" isn't a valid IMAGE_FSTYPES item.
>
> Also, try IMAGE_FSTYPES += rather than _append, that allows the initramfs
> image to have its own value (because it's not really valid to make a live
> initramfs...)

Sorry, I misread/misapplied your previous suggestions.

>
>> IMAGE_FEATURES_append = " read-only-rootfs"
>
> Try EXTRA_IMAGE_FEATURES += instead of IMAGE_FEATURES_append

I've changed both of these and it still fails if I enable the
read-only-rootfs.

If I leave that option out, I can build an .hddimg which I dd'd
to my USB stick.  It tried to boot, finds /vmlinuz but fails to
find /initrd

My local.conf settings are now:
# Live CD setup
IMAGE_FSTYPES += " live"
#IMAGE_FEATURES += " read-only-rootfs"
CORE_IMAGE_EXTRA_INSTALL += " python-core python-modules"

Finally, during one of my builds, I ended up with a core-image-minimal*.iso
I tried burning this to a CD an it booted up, albeit with a couple of
complaints about a read-only rootfs.  Sadly, I no longer get any .iso
results when I 'bitbake core-image-minimal'

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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