[yocto] Live images?

[Paul Eggleton]

Hi Gary,

On Thursday 05 June 2014 13:10:00 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:
> >>>>>> 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-ima
> >> | ge
> >> | -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-ima
> >> | ge
> >> | -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'

As far as I know you should get a .iso with live in IMAGE_FSTYPES, unless you 
set NOISO = "1". If you're not getting that or seeing other unexpected 
behaviour I think the best course of action would be to file a bug, and we'll 
try to track down the cause of the issue.

Cheers,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre