Re: [PATCH RESEND] initramfs: cleanup incomplete rootfs

[Andrew Morton]

On Sat, 9 Feb 2019 12:35:03 +0200 Andy Shevchenko <andy.shevchenko@xxxxxxxxx> wrote:

> On Sat, Feb 9, 2019 at 12:08 AM Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> > On Fri, 8 Feb 2019 21:45:21 +0200 Andy Shevchenko <andy.shevchenko@xxxxxxxxx> wrote:
> > > On Tue, Oct 30, 2018 at 5:22 PM David Engraf <david.engraf@xxxxxxxxx> wrote:
> > > >
> > > > Unpacking an external initrd may fail e.g. not enough memory. This leads
> > > > to an incomplete rootfs because some files might be extracted already.
> > > > Fixed by cleaning the rootfs so the kernel is not using an incomplete
> > > > rootfs.
> > >
> > > This breaks my setup where I have U-boot provided more size of
> > > initramfs than needed. This allows a bit of flexibility to increase or
> > > decrease initramfs compressed image without taking care of bootloader.
> > > The proper solution is to do this if we sure that we didn't get enough
> > > memory, otherwise I can't consider the error fatal to clean up rootfs.
> >
> > OK, thanks.  Maybe David can suggest a fix - I'll queue up a revert
> > meanwhile.
> >
> > I don't really understand the failure.  Why does an oversized initramfs
> > cause unpack_to_rootfs() to fail?
> 
> In my case I have got "Junk in compressed archive". I don't know (I
> would check if needed) which exact condition I got  since there are
> three places with this message.

Well that's a plain irritating screwup right there.  Could someone
please cook up a patch to give us three distinct (and hopefully more
informative) error messages?