[SoaS] Run livecd-iso-to-disk in the source environment with chroot

[Frederick Grose]

On Wed, Sep 5, 2012 at 6:40 PM, Frederick Grose <fgrose at gmail.com> wrote:

> This version of livecd-iso-to-disk is reworked to use the source root
> filesystem in a chroot by default, along with the livecd-iso-to-disk script
> embedded in the source.  A --nochroot as well as a --avoidsourcescript
> option are available for cases where the launching filesystem and/or
> installation script is called for.
>
> One can load a Live USB by these steps:
>  1. mounting the source.iso
>  2. determine its loop device, /dev/loopN
>  3. call /mountpoint/LiveOS/livecd-iso-to-disk /dev/loopN /dev/target
>
> All 3 steps could be avoided by providing some appropriate autorun scripts
> for the iso, or including some standard install scripts that could be
> invoked by clicking on them in Nautilus.
>
> By mounting the source.iso LiveOS filesystem in a chroot enviroment, the
> current version of software components, including the installation script,
> on the source can be used for installation.  (If syslinux-extlinux is not
> in the source, ext234,btrfs target devices will have to use the --nochroot
> option and a system with the proper bootloader.)  An --avoidsourcescript
> option is also added to allow installation with alternative scripts.
>
> This new version of livecd-iso-to-disk prefers builtin functions, finds
> and offers to unmount mounted targets, and reorders some compatibility
> checks in order to bailout early, if needed.
>
> If this passes further testing (the DVD and netinst installer paths are
> untested), I can submit incremental patches for these changes.
>
> Link to the reworked livecd-iso-to-disk script,
> https://bugzilla.redhat.com/attachment.cgi?id=610112
>
> Filed on this ticket,
> https://bugzilla.redhat.com/show_bug.cgi?id=663986
>
>
> Testing and comments would be appreciated.
>
>             --Fred
>

The script can be tested on an existing source.iso by invoking it with the
--avoidsourcescript option, which will complete the installation using the
launched script in the chroot instead of the the onboard version of
livecd-iso-to-disk.

The script could also be copied to the /LiveOS/ directory in the device
filesystem of an installed Live USB, and then called from the from the
mount point for that device, such as,
/run/media/liveuser/MyUSBname/LiveOS/livecd-iso-to-disk /dev/MyUSBnode
/dev/target, where MyUSBname is the mount point directory name and
MyUSBnode is the /dev filesystem node, such as, sdc1 or sdd1, etc.

             --Fred
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