gen-efi

#!/bin/sh -e

# rEFIt searches for /EFI/*/*.EFI, so care must be taken
# to preserve uppercase for case-sensitive filesystems

# i386-efi:   most pre-2008 Macs (EFI 1.x + UGA)
# x86_64-efi: later Macs (EFI 1.x + GOP), all non-Macs (UEFI 2.x + GOP)

# Paths mandated for removable media devices by
# UEFI Spec 2.3.1 Err. A, Sec. 12.3.1.3 and 3.4.1.1
efidir=/EFI/BOOT
ia32name=BOOTIA32.EFI
x64name=BOOTx64.EFI

grubroot=/boot/grub
grubcfg=${grubroot}/grub.cfg
templcfg=${HOME}/config/grub.cfg
templearlycfg=${HOME}/config/grub-early.cfg

consolefont=euro.pf2


# Included modules (command.lst, partmap.lst, fs.lst, video.lst)
modules_core="normal configfile echo test true cat help minicmd sleep ls"
modules_fs="part_msdos part_gpt iso9660 fat ext2 hfsplus loopback"
modules_boot="boot linux halt reboot chain appleldr"
modules_arch="cpuid loadbios gfxterm efi_gop efi_uga fixvideo"
modules_io="search hashsum gcry_sha256 read"
modules="${modules_core} ${modules_fs} ${modules_boot} ${modules_arch} ${modules_io}"


# Building a memdisk (see grub2-mkstandalone (Savannah: #36772, #39796))
memdisk() {
    local out="$1" arch="$2" mods="$3"
    local build=`mktemp -d`
    local memroot=${build}/boot/grub
    local libdir=/usr/lib/grub moddir=${memroot}/${arch}
    [ -n "${build}" ] || return 1

    # Iteratively include all dependent modules
    local oldmods= deps= modname=
    while [ "${mods}" != "${oldmods}" ]; do
        oldmods="${mods}"
        for modname in ${mods}; do
            deps=`sed -n "s/^${modname}://p" ${libdir}/${arch}/moddep.lst`
            mods="${mods}${deps}"
        done

        mods=`echo ${mods} | tr ' ' '\n' | sort -u`
    done

    # Filter filesystems list, so that "search" doesn't try to load modules
    mkdir -p ${moddir}
    cp -p ${libdir}/${arch}/*.lst ${moddir}
    sed -ri "/^(`echo ${mods} | tr ' ' '|'`)\$/b; d" ${moddir}/fs.lst

    # NOTE: localization files go into ${memroot}/locale/*.mo
    mods=`echo "${mods}" | sed "s:.*:${libdir}/${arch}/&.mod:"`
    cp -p ${mods} ${moddir}

    cat ${templearlycfg}               \
        | sed "/^##/d ;                \
               s@VERSION@${LVERSION}@" \
        > ${memroot}/grub.cfg

    # Compress all files (*.mod, *.lst, grub.cfg)
    xz -C crc32 --lzma2=dict=1MiB `find ${memroot} -type f`
    rename .xz ""                 `find ${memroot} -type f`

    # Add bogus manifest (to be patched in mk-boot)
    echo "replace_hash__________________________________________________01  /liberte${grubcfg}"        > ${memroot}/grub.mf
    echo "replace_hash__________________________________________________02  /liberte${grubcfg%.*}.mf" >> ${memroot}/grub.mf

    tar -cf ${build}/memdisk.tar -C ${build} boot

    # NOTE: -C has no effect (Savannah: #36770)
    # grub2-mkstandalone -C xz -O ${arch} -o ${out} --compress=xz --install-modules="${modules}"
    #                    --themes=none --fonts=none --locales=none (Savannah: #36772)
    grub2-mkimage -C xz -O ${arch} -m ${build}/memdisk.tar \
                  -o ${out} memdisk tar xzio gcry_crc
    rm -r ${build}
}


# Generate EFI binaries with modules in memdisk
mkdir -p /boot${efidir}

memdisk /boot${efidir}/${ia32name} i386-efi   "${modules}"
memdisk /boot${efidir}/${x64name}  x86_64-efi "${modules}"


# Copy gfxterm font
mkdir -p ${grubroot}
cp -p /usr/share/grub/${consolefont} ${grubroot}


# Substitute and copy template
cat ${templcfg}                           \
    | sed "/^##/d ;                       \
           s@VERSION@${LVERSION}@ ;       \
           s@CONSOLEFONT@${consolefont}@" \
    > ${grubcfg}