multiboot-setup.sh: syslinux/refind USB boot

diff --git a/scripts/multiboot-setup.sh b/scripts/multiboot-setup.sh
new file mode 100755 (executable)
index 0000000..8dd4fdf
--- /dev/null
+++ b/scripts/multiboot-setup.sh
@@ -0,0 +1,122 @@
+#!/bin/bash
+
+set -e
+
+SYSLINUX_CFG="syslinux/syslinux.cfg"
+REFIND_CFG="System/Library/CoreServices/refind.conf"
+
+function setup_bootloader {
+    install_syslinux
+    install_refind
+    rm -rf distros
+}
+
+function install_syslinux {
+    rm -rf syslinux
+    mkdir syslinux
+    cp -R /usr/lib/syslinux/bios/* syslinux/
+
+    echo "UI menu.c32" >> "$SYSLINUX_CFG"
+
+    echo "Install syslinux:"
+    echo "  # syslinux -i -d syslinux /dev/sdX"
+}
+
+function install_refind {
+    rm -rf System
+    mkdir -p System/Library/CoreServices
+    cp -R /usr/share/refind/* System/Library/CoreServices/
+    cp System/Library/CoreServices/{refind_x64.efi,boot.efi}
+
+    echo "timeout 0" >> "$REFIND_CFG"
+    echo "scanfor manual" >> "$REFIND_CFG"
+}
+
+function setup_iso {
+    mount_iso
+    set_boot_vars
+    copy_boot_files
+    configure_syslinux
+    configure_refind
+    umount_iso
+}
+
+function mount_iso {
+    umount_iso
+    sudo mount "$ISOFILE" /mnt
+}
+
+function umount_iso {
+    sudo umount /mnt || true
+}
+
+function set_boot_vars {
+    if [[ "$ISOFILE" == *ubuntu*.iso ]]; then
+        set_ubuntu_boot_vars
+    elif [[ "$ISOFILE" == *fedora*.iso ]]; then
+        set_fedora_boot_vars
+    else
+        echo "Unsupported ISO! $ISOFILE"
+    fi
+}
+
+function set_ubuntu_boot_vars {
+    version="$(basename "$ISOFILE" | cut -d- -f2)"
+    menulabel="Ubuntu $version"
+    unpackdir="distros/ubuntu_$(generate_safe_filename "$version")"
+    kernel="/mnt/casper/vmlinuz.efi"
+    initrd="/mnt/casper/initrd.lz"
+    bootparams="boot=casper iso-scan/filename=/${unpackdir}/$(basename "$ISOFILE")"
+}
+
+function set_fedora_boot_vars {
+    version="$(basename "$ISOFILE" .iso | sed 's/.*x86_64-//')"
+    menulabel="Fedora $version"
+    unpackdir="distros/fedora_$(generate_safe_filename "$version")"
+    kernel="/mnt/isolinux/vmlinuz0"
+    initrd="/mnt/isolinux/initrd0.img"
+    bootparams="root=live:CDLABEL=$(basename "$ISOFILE" .iso) rootfstype=auto iso-scan/filename=/${unpackdir}/$(basename "$ISOFILE")"
+}
+
+function generate_safe_filename {
+    echo -n "$1" | tr -c '[:alnum:]\n' '_'
+}
+
+function copy_boot_files {
+    mkdir -p "${unpackdir}"
+    ln "$ISOFILE" "${unpackdir}/"
+    cp "$kernel" "$initrd" "${unpackdir}/"
+}
+
+function configure_syslinux {
+    cat <<EOT >> "$SYSLINUX_CFG"
+
+LABEL $(basename $unpackdir)
+MENU LABEL ${menulabel}
+LINUX /${unpackdir}/$(basename ${kernel})
+INITRD /${unpackdir}/$(basename ${initrd})
+APPEND ${bootparams}
+EOT
+}
+
+function configure_refind {
+    cat <<EOT >> "$REFIND_CFG"
+
+menuentry "${menulabel}"
+    loader /${unpackdir}/$(basename ${kernel})
+    initrd /${unpackdir}/$(basename ${initrd})
+    options "${bootparams}"
+}
+EOT
+}
+
+cd "$(dirname "$0")"
+
+if [ "$1" = "reset" ]; then
+    setup_bootloader
+elif [[ "$1" == *.iso ]]; then
+    ISOFILE="$1"
+    setup_iso
+else
+    echo "Usage: [bootloader|/path/to/ubuntu.iso]"
+fi