Bug 826971

I can confirm this issue as I ran into it as well while upgrading fc16 to 17 using preupgrade. As mentioned correctly you will only run into this issue when your /boot has insufficient space to save the "squashfs.img" file.

The issue is that when trying to download the "squashfs.img" file from your local mirror, the last part of the url ("/LiveOS/squashfs.img") is appended to the url specified in your grub menu entry (/boot/grub2/grub.cfg) that has to be booted to start the upgrade:

menuentry 'Upgrade to Fedora 17 (Beefy Miracle)' --class gnu-linux --class gnu --class os {
        linux /upgrade/vmlinuz preupgrade repo=hd::/var/cache/yum/preupgrade ks=hd:UUID=<uuid>:/upgrade/ks.cfg stage2=http://<your mirror>/fedora/linux/releases/17/Fedora/i386/os/LiveOS/squashfs.img
        initrd /upgrade/initrd.img
}

As you can see in the example above, the menu entry already contains the "/LiveOS/squashfs.img" part in the url. I worked around it by removing that part from the menu entry specified in /boot/grub2/grub.cfg:

menuentry 'Upgrade to Fedora 17 (Beefy Miracle)' --class gnu-linux --class gnu --class os {
        linux /upgrade/vmlinuz preupgrade repo=hd::/var/cache/yum/preupgrade ks=hd:UUID=<uuid>:/upgrade/ks.cfg stage2=http://<your mirror>/fedora/linux/releases/17/Fedora/i386/os
        initrd /upgrade/initrd.img
}

After that, you will be able to start the upgrade process as you were supposed to.

I think these two commits introduced the error, but I can be wrong :)
http://git.fedorahosted.org/git/?p=preupgrade.git;a=commitdiff;h=176a61246384533897879bd1aa961afdf5425de9

author	James Laska <jlaska>	
	Tue, 15 Mar 2011 10:38:32 +0000 (10:38 +0000)
committer	Richard Hughes <richard>	
	Tue, 15 Mar 2011 10:38:32 +0000 (10:38 +0000)
commit	176a61246384533897879bd1aa961afdf5425de9
tree	65560ea17efe17660cf23bcbd64495c7e9ccf920
parent	e49320d69f41a61c6d3a3803106469e9caab0b0b
Fix preupgrade-cli now stage2 is not shipped in F15
Signed-off-by: Richard Hughes <richard>


http://git.fedorahosted.org/git/?p=preupgrade.git;a=commitdiff;h=e49320d69f41a61c6d3a3803106469e9caab0b0b
author	James Laska <jlaska>	
	Thu, 3 Mar 2011 09:59:06 +0000 (09:59 +0000)
committer	Richard Hughes <richard>	
	Thu, 3 Mar 2011 09:59:31 +0000 (09:59 +0000)
commit	e49320d69f41a61c6d3a3803106469e9caab0b0b
tree	f6ec7e3ee96673736645f4fe24ab0b31507cfda6
parent	de9b9784789ccfa4b40244da70233500d8062904
Fix preupgrade not stage2 is not shipped in F15

This bug is a duplicate of https://bugzilla.redhat.com/show_bug.cgi?id=813973 - isn't it?

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