[yocto] Live images?

[Gary Thomas]

On 2014-06-05 13:10, Gary Thomas wrote:
> 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'
>

BTW, I tried this with daisy and the CD version (read-only)
worked just fine for me - the ISO and .hddimg files built with
no errors.

I'm bisecting now to see what broke...

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