Re: Exercise: Booting from a LiveUSB ISO and contents on /dev/sda6

[Philip Rhoades]

People,


On 2015-11-02 17:28, Fajar A. Nugraha wrote:
> On Mon, Nov 2, 2015 at 12:36 PM, Jordan Uggla <address@hidden>
> wrote:
>
> > On Mon, Nov 2, 2015 at 3:27 AM, Philip Rhoades <address@hidden>
> > wrote:
> > > People,
> > >
> > > I want to enlarge my root partition on a Fedora 23 x86_64 system
> > and I know
> > > I can boot on a LiveUSB stick and use [g]parted from there to do
> > what I want
> > > but I thought I would try creating a small partition with the ISO
> > and its
> > > contents in it to see if I could do what I want without needing to
> > use the
> > > USB stick.
> >
> > Since this is an end user support question, rather than a patch or
> > discussion about developing grub, it should be posted to
> > address@hidden rather than grub-devel. I have CC'd helo-grub. In
> > your replies, please include help-grub and *remove* grub-devel from
> > any further replies. This problem is also actually more Fedora
> > specific than grub related, as explained below.
> >
> > > The contents of /dev/sda6 is:
> > >
> > > dr-xr-xr-x 3 root root 4096 May 22 05:03 EFI
> > > dr-xr-xr-x 2 root root 4096 May 22 05:05 LiveOS
> > > dr-xr-xr-x 2 root root 4096 May 22 05:03 isolinux
> > > drwx------ 2 root root 16384 Nov 2 06:08 lost+found
> > > -r--r--r-- 1 root root 2460 May 22 05:04
> > Fedora-Legal-README.txt
> > > -rw-r----- 1 qemu qemu 1007681536 Oct 7 20:14
> > > Fedora-Live-Xfce-x86_64-22-3.iso
> > > -r--r--r-- 1 root root 1063 May 22 05:04 LICENSE
> > >
> > >
> > > I have made a little progress but I still can't get a boot - here
> > is the
> > > current state of the relevant section of my grub2.cfg (I have been
> > trying
> > > various changes):
> > >
> > > menuentry "Fedora 22 XFCE ISO Boot (x86_64 bit)" {
> > > insmod part_gpt
> > > set isoname="Fedora-Live-Xfce-x86_64-22-3"
> > > echo $isoname
> > > set isofile="${isoname}.iso"
> > > echo $isofile
> > > loopback loop (hd0,gpt6)/$isofile
> > > echo $loop
> > > linux (loop)/isolinux/vmlinuz0 root=live:CDLABEL=${isoname}
> > > rootfstype=auto ro rd.live.image rd.luks=0 rd.md [1]=0 rd.dm [2]=0
> > > iso-scan/filename=${isofile}
> >
> > iso-scan/filename= is a kernel parameter that Fedora does not
> > support,
> > as Fedora does not support loop booting (booting from the iso file
> > on
> > a filesystem rather than burned to a DVD or extracted to a hard
>
> Is that a regression?
>
> These links suggest that you can boot fedora from iso, with
> iso-scan/filename.
>
> https://ask.fedoraproject.org/en/question/33055/boot-fedora-20-from-iso/
> [4]
>
> https://tlhp.cf/multiusb-flash_drive/ [5]
>
> https://wonderneko.wordpress.com/2015/09/17/boot-iso-fedora-22-via-grub-ubuntu-14-04/
> [6]


Good to know!


> > drive). Please file a bug report against Fedora asking them to add
> > such support, or extract the iso (which you have also done already),
> > or use a distribution that supports loop booting such as Ubuntu. For
> > instructions on loop booting an Ubuntu iso (or any other iso which
> > ships with a loopback.cfg) please see
> http://www.supergrubdisk.org/wiki/Loopback.cfg#How_do_you_use_a_loopback.cfg_to_boot_an_iso.3F
> > [3]
> > .
> >
> > > initrd (loop)/isolinux/initrd0.img
> > > }
> > >
> > > During the attempted boot I see the first two "echo"s but then get
> > messages
> > > that "linux" and "initrd" commands do not exist . . is it
> > something simple I
> > > am missing?
> >
> > This is a Fedora specific problem, with upstream grub you would not
> > have this problem. I am not very familiar with Fedora's secure boot
> > setup, but I suspect that is the reason that the "linux" and
> > "initrd"
> > commands are not available, and that instead you need to use
> > "linuxefi" and "initrdefi".
>
> That's probably it.


It was - and you were correct above - I simply added "efi" to both 
commands and everything worked (I should have noticed that change 
myself) . . I thought people here would like to know the result but I 
will make sure I do "user" instead of "devel" next time . .

Thanks people,

Phil.
--
Philip Rhoades

PO Box 896
Cowra  NSW  2794
Australia
E-mail:  address@hidden