# grub-overlay.cfg.tpl — replaces /EFI/debian/grub.cfg in the built ISO.
# Self-contained, single-icon Apple boot, kernel cmdline baked in.
# @GRUB_PARAMS@ replaced at build time. @VARIANT@ for menu label.

set timeout=8
set default=0

# Find the iso9660 partition. Apple firmware enumerates the USB at an
# unpredictable hd number (USB might be hd0, hd1, or hd2 depending on
# whether internal SSD was detected). Try in order:
#   1. ${cmdpath} = where GRUB was loaded from, e.g. (hd1,msdos2)/efi/debian.
#      Extract the hdN, set root=(hdN,msdos1) — same disk, partition 1.
#   2. search --label (works if iso9660 module + partition not type 0x00)
#   3. Probe (hd0,msdos1) ... (hd3,msdos1)
#   4. Drop to GRUB shell so operator can debug with `ls`
insmod part_msdos
insmod part_gpt
insmod iso9660
insmod fat
insmod regexp
echo "GRUB loaded. cmdpath=${cmdpath}"

# Method 1: derive hd from cmdpath
regexp -s 1:disk '\((hd[0-9]+)' "$cmdpath"
if [ -n "$disk" ]; then
    set root="($disk,msdos1)"
    echo "trying root=$root (from cmdpath)"
fi
if [ -e /install.amd/vmlinuz ]; then echo "found kernel at $root"; else
    # Method 2: filesystem label search
    search --label --no-floppy --set=root @VOLID@
    if [ -e /install.amd/vmlinuz ]; then echo "found kernel via label"; else
        # Method 3: brute-force hd0..hd3
        for d in 0 1 2 3 ; do
            set root="(hd${d},msdos1)"
            if [ -e /install.amd/vmlinuz ]; then echo "found kernel at hd${d}"; break; fi
        done
        if ! [ -e /install.amd/vmlinuz ]; then
            echo "ERROR: cannot find /install.amd/vmlinuz on any disk."
            echo "Drop to GRUB shell with 'c'. Run 'ls' to see devices, then"
            echo "set root=(hdX,msdosY) where X,Y point at the iso9660 partition."
            sleep 30
        fi
    fi
fi

if loadfont unicode ; then
    insmod efi_gop
    insmod efi_uga
    insmod gfxterm
    set gfxmode=auto
    set gfxpayload=keep
    terminal_output gfxterm
fi

set BAKED="@GRUB_PARAMS@"

menuentry --hotkey=i 'Auto-install [@VARIANT@] (preseed)' {
    set background_color=black
    linux    /install.amd/vmlinuz auto=true priority=@PRIORITY@ file=/cdrom/preseed.cfg $BAKED vga=788 --- quiet
    initrd   /install.amd/initrd.gz
}
menuentry --hotkey=g 'Auto-install [@VARIANT@] (graphical)' {
    set background_color=black
    linux    /install.amd/vmlinuz auto=true priority=@PRIORITY@ file=/cdrom/preseed.cfg $BAKED vga=788 --- quiet
    initrd   /install.amd/gtk/initrd.gz
}
menuentry --hotkey=m 'Manual install (no preseed) [@VARIANT@ kernel params]' {
    set background_color=black
    linux    /install.amd/vmlinuz $BAKED vga=788 --- quiet
    initrd   /install.amd/initrd.gz
}
menuentry --hotkey=r 'Rescue mode [@VARIANT@ kernel params]' {
    set background_color=black
    linux    /install.amd/vmlinuz $BAKED vga=788 rescue/enable=true --- quiet
    initrd   /install.amd/initrd.gz
}
menuentry --hotkey=s 'Drop to installer shell' {
    set background_color=black
    linux    /install.amd/vmlinuz $BAKED vga=788 rescue/enable=true --- quiet
    initrd   /install.amd/initrd.gz
}