#!/usr/bin/env bash
# Builds the answer-file ISOs into build/:
#   virtio-vms.iso  latest virtio-win drivers + unattend/vms-WIPE-DISK.xml (as autounattend.xml) + oobe-vms.ps1
#   desktop.iso     unattend/desktop-PROMPT-DISK.xml (as autounattend.xml) + oobe-desktop.ps1
# The virtio-win ISO is only downloaded again when a new release is published.
# Requires: curl, xorriso
set -euo pipefail
cd "$(dirname "$0")"

VIRTIO_LATEST=https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/latest-virtio/virtio-win.iso
BUILD=build
STAGE=$BUILD/stage
# Joliet names so Windows sees oobe-*.ps1 and autounattend.xml unmangled (volume labels max 16 chars)
JOLIET=(-joliet on -compliance joliet_long_names)

# Root of the ISO as Windows reads it (Joliet, not Rock Ridge)
show_root() {
    echo "== $1"
    xorriso -report_about WARNING -read_fs norock -indev "$1" -lsl / 2>/dev/null | grep -E -i 'autounattend|oobe-|guest-tools' | awk '{print "   ", $NF}'
}

mkdir -p "$BUILD"

# Resolve "latest" to the versioned file; Fedora's redirects drop to plain http, so force https
VIRTIO_URL=$(curl -fsSIL -o /dev/null -w '%{url_effective}' "$VIRTIO_LATEST" | sed 's#^http://#https://#')
VIRTIO_ISO=$BUILD/$(basename "$VIRTIO_URL")
if [[ -f $VIRTIO_ISO ]]; then
    echo "Using cached $VIRTIO_ISO"
else
    echo "Downloading $VIRTIO_URL"
    curl -fL --retry 3 -o "$VIRTIO_ISO.part" "$VIRTIO_URL"
    mv "$VIRTIO_ISO.part" "$VIRTIO_ISO"
fi

# a. VMs: virtio-win + VM answer file + oobe-vms.ps1
# Files are added to a copy of the original image rather than extracting and repacking it:
# virtio-win stores identical drivers once, and repacking would nearly double its size.
rm -f "$BUILD/virtio-vms.iso"
xorriso -report_about WARNING -indev "$VIRTIO_ISO" -outdev "$BUILD/virtio-vms.iso" "${JOLIET[@]}" -volid VIRTIO_VMS \
    -map unattend/vms-WIPE-DISK.xml /autounattend.xml \
    -map oobe-vms.ps1 /oobe-vms.ps1 \
    -commit

# b. Desktops: desktop answer file + oobe-desktop.ps1, no virtio
rm -rf "$STAGE" "$BUILD/desktop.iso"
mkdir -p "$STAGE"
cp unattend/desktop-PROMPT-DISK.xml "$STAGE/autounattend.xml"
cp oobe-desktop.ps1 "$STAGE/"
xorriso -report_about WARNING -outdev "$BUILD/desktop.iso" "${JOLIET[@]}" -volid OOBE_DESKTOP -map "$STAGE" / -commit
rm -rf "$STAGE"
show_root "$BUILD/virtio-vms.iso"
show_root "$BUILD/desktop.iso"
ls -lh "$BUILD"/*.iso