Re: [Xen-devel] [PATCH OSSTEST v2 01/19] Introduce mg-pxe-loader-update

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Ian Campbell writes ("[PATCH OSSTEST v2 01/19] Introduce mg-pxe-loader-update"):
> The story for PXE booting via UEFI (at least on arm64) is not so
> straightforward as with pxelinux on x86. There seems to no good
> bootloader to launch via UEFI+pxe, in fact all I could find was grub
> (syslinux, and by extension pxelinux.efi, is x86 only).
> 
> Add mg-pxe-loader-update modelled on mg-debian-installer-update which
> will download the necessary grub binaries and produce a grub image
> which can be used to pxe boot.
> 
> grub lacks the convenient ability to search for config file based on
> (substrings of) the MAC or IP address. So we arrange for the grub.cfg
> in TftpGrubBase to chain load another config file from
> TftpTmpDir/'$net_default_mac' where $net_default_mac is a grub
> variable which is substituted at boot time.
> 
> Actually using this requires that bootp/dhcp provide a next-file so
> UEFI knows what to boot (usually this would be pxelinux.0 which we
> can't use here). Locally we have configured this as $name/pxe.img, so
> we can use different loaders.
...
> +    curl -s $pfile >Packages.gz
> +
> +    echo >&2 "collecting $grubdeb"
> +    pkgfile=`zcat Packages.gz | grep-dctrl -PX $grubdeb -nsFilename | sort 
> -n -r | head -n1`
> +    rc=$?
> +    set -e
> +    if [ $rc -ne 0 ] || [ x$pkgfile = x ]; then fail "$grubdeb package not 
> found"; fi
> +    curl -s "$site/$pkgfile" >$grubdeb.deb

This is indeed _very_ similar to parts of mg-debian-installer-update.
Perhaps some of this should be made common ?  You may need to invent a
new file.

I notice that mg-debian-installer-update has `fetch' which uses a
Pragma: to try to avoid proxies.  Do we need the same here ?

Thanks,
Ian.

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