PoC RFC Generate (i)PXE files in create-iso for amd64 and friends

Copy out needed files from iso to perform iPXE boot from gentoo mirrors Provided as PoC of what is needed for this to be vaild If merged this would resolve NiKiZe/Gentoo-iPXE#2 There is an alternative aproch to extract and generate these files during upload instead Really want to have this in the same target as minimal livecd To test result with qemu localy after build (replace your variables): qemu-system-x86_64 -enable-kvm -M q35 -m 1024 -cpu host -nic user,model=virtio,\ tftp="${BUILD_SRCDIR_BASE}"/builds/default,\ bootfile=install-amd64-minimal-${TIMESTAMP}.ipxe \ -watchdog i6300esb -watchdog-action reset -boot menu=on -usb Signed-off-by: Christian Nilsson <[email protected]>
NiKiZe · Jul 28, 2021 · 399cb88 · 399cb88
1 parent 6b23e58
commit 399cb88
Showing 1 changed file with 40 additions and 0 deletions.
diff --git a/targets/support/create-iso.sh b/targets/support/create-iso.sh
@@ -271,6 +271,46 @@ case ${clst_hostarch} in
 			echo 'Creating ISO with fingers crossed that you know what you are doing...'
 			run_mkisofs -J -R -l ${mkisofs_zisofs_opts} -V "${clst_iso_volume_id}" -o "${1}" "${clst_target_path}"/
 		fi
+
+		# Use same kernel, initrd and squashfs to generate PXE bootable files
+		iso="${1}"
+		dstpath=${iso%%.iso}
+		dstname=$(basename ${dstpath})
+		kernel=${clst_boot_kernel}
+		for x in ${clst_boot_kernel}
+		do
+		    kernel=${x}
+		done
+		echo "Copy kernel for use outside iso ${dstpath}.lkrn"
+		cp -vf "${clst_target_path}/boot/${kernel}" "${dstpath}.lkrn"
+		echo "Generate combined initrd + squashfs ${dstpath}.igz"
+		# change dir to get squashfs in current dir for correct cpio creation
+		pushd "${clst_target_path}"
+		# combine original initrd with squashfs
+		# different variants can be used, compression
+		# the selected combination here gives most responsive boot (avoids several seconds of black screen)
+		(cat "boot/${kernel}.igz" ; (echo image.${clst_fstype} | cpio -H newc -o)) > "${dstpath}.igz"
+		popd
+
+		# Generate kernel cmdline for use in iPXE script
+		if [ -z "${cmdline_opts}" ]
+		then
+			check_bootargs
+			check_filesystem_type
+		fi
+		default_append_line="root=/dev/ram0 init=/linuxrc ${cmdline_opts} ${custom_kopts} cdroot"
+		ipxename="${dstpath}.ipxe"
+		echo "Generating iPXE script ${ipxename}"
+		echo '#!ipxe' > ${ipxename}
+		echo '# allow for external keymap setting' >> ${ipxename}
+		echo 'isset ${keymap} || set keymap dokeymap' >> ${ipxename}
+		echo '# allow for external cmdline options' >> ${ipxename}
+		echo 'isset ${cmdline} || set cmdline vga=791' >> ${ipxename}
+		# initrd= on cmdline is needed for efi
+		echo "kernel ${dstname}.lkrn ${default_append_line/dokeymap/\$\{keymap\}} initrd=${dstname}.igz \${cmdline}" >> ${ipxename}
+		echo "initrd ${dstname}.igz" >> ${ipxename}
+		echo 'imgstat' >> ${ipxename}
+		echo 'boot' >> ${ipxename}
 	;;
 esac
 exit  $?