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fix: Reset magic byte on cached ISOs to trigger install pipeline

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The container marks processed ISOs with byte 0x16 at offset 0. Restoring
a cached ISO with this byte into an empty data directory caused the
container to skip installation and try to boot a nonexistent disk,
dropping into a UEFI shell. Now resets byte 0 to 0x00 after copying so
the container re-processes the ISO (driver injection, answer file, etc.)
without re-downloading it. Also adds cache auto-restore to cmd_start()
for base versions, not just cmd_new() instances.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Michel Abboud 2026-01-30 08:10:55 +00:00
parent 2b07b9cf07
commit aa45e1691e
1 changed files with 25 additions and 0 deletions
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25
winctl.sh
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@ -1075,6 +1075,26 @@ cmd_start() {
mkdir -p "$data_dir"
fi
# Pre-populate from ISO cache if data dir is empty
if [[ -z "$(ls -A "$data_dir" 2>/dev/null)" ]]; then
local cache_src="$ISO_CACHE_DIR/$RESOLVED_BASE"
if [[ -d "$cache_src" ]]; then
local iso_files
iso_files=$(find "$cache_src" -maxdepth 1 -name '*.iso' -type f 2>/dev/null || true)
if [[ -n "$iso_files" ]]; then
info "Restoring cached ISO for $RESOLVED_BASE..."
cp "$cache_src"/*.iso "$data_dir/"
# Reset magic byte so the container re-processes the ISO
# (installs from it) instead of trying to boot a missing disk
local restored_iso
for restored_iso in "$data_dir"/*.iso; do
printf '\x00' | dd of="$restored_iso" bs=1 seek=0 count=1 conv=notrunc status=none 2>/dev/null || true
done
success "ISO restored from cache (skipping download)"
fi
fi
fi
# Check ports are available
if ! check_port "$RESOLVED_WEB_PORT"; then
error "Web port $RESOLVED_WEB_PORT is already in use"
@ -2353,6 +2373,11 @@ cmd_new() {
if [[ -n "$iso_files" ]]; then
info "Restoring cached ISO for $version..."
cp "$cache_src"/*.iso "$data_dir/"
# Reset magic byte so the container re-processes the ISO
local restored_iso
for restored_iso in "$data_dir"/*.iso; do
printf '\x00' | dd of="$restored_iso" bs=1 seek=0 count=1 conv=notrunc status=none 2>/dev/null || true
done
success "ISO restored from cache (skipping download)"
fi
fi