build-packages

#!/usr/bin/env bash

set -e

: "${HELPER_PACKAGES_DIR:=/var/lib/pi-gen-micro/helper-packages}"
: "${PACKAGES_DIR:=/var/lib/pi-gen-micro/internal/packages}"

usage() {
    cat <<EOF
Usage: $(basename "$0") [options] [package_dir ...]

Build helper .deb packages from control/install definitions and
regenerate the local package index.

With no arguments, rebuilds all packages found under HELPER_PACKAGES_DIR.
With arguments, builds only the specified package directories.

Options:
  -h, --help    Show this help message
  -n, --dry-run Show what would be built without building

Environment variables:
  HELPER_PACKAGES_DIR  Path to helper package sources (default: /var/lib/pi-gen-micro/helper-packages)
  PACKAGES_DIR         Output directory for .deb files (default: /var/lib/pi-gen-micro/internal/packages)

Examples:
  $(basename "$0")                        # rebuild all
  $(basename "$0") cryptroot              # rebuild just cryptroot
  $(basename "$0") cryptroot ssh-service  # rebuild specific packages

To list available packages with descriptions, use:
  pi-gen-micro --list-packages
EOF
    exit 0
}

list_package_names() {
    find "${HELPER_PACKAGES_DIR}" -maxdepth 2 -name control -printf '%h\n' | sort | while read -r dir; do
        printf "  %s\n" "$(basename "$dir")"
    done
}

DRY_RUN=0
TARGETS=()

while [ $# -gt 0 ]; do
    case "$1" in
        -h|--help) usage ;;
        -n|--dry-run) DRY_RUN=1; shift ;;
        -*) echo "Unknown option: $1" >&2; exit 1 ;;
        *) TARGETS+=("$1"); shift ;;
    esac
done

# Find package directories to build
PACKAGE_DIRS=()
if [ ${#TARGETS[@]} -eq 0 ]; then
    while IFS= read -r dir; do
        PACKAGE_DIRS+=("$dir")
    done < <(find "${HELPER_PACKAGES_DIR}" -maxdepth 2 -name control -printf '%h\n' | sort)
else
    for target in "${TARGETS[@]}"; do
        target="${target%/}"
        dir="${HELPER_PACKAGES_DIR}/${target}"
        if [ ! -f "${dir}/control" ]; then
            echo "Error: No control file found in ${target}/" >&2
            echo "Available packages:" >&2
            list_package_names >&2
            exit 1
        fi
        PACKAGE_DIRS+=("$dir")
    done
fi

if [ ${#PACKAGE_DIRS[@]} -eq 0 ]; then
    echo "No packages found to build." >&2
    exit 1
fi

mkdir -p "${PACKAGES_DIR}"

for dir in "${PACKAGE_DIRS[@]}"; do
    name="$(basename "$dir")"
    pkg_name="$(sed -n 's/^Package: *//p' "$dir/control")"
    version="$(dpkg-parsechangelog -l "$dir/changelog" -S Version)"
    arch="$(sed -n 's/^Architecture: *//p' "$dir/control")"

    if [ "$DRY_RUN" -eq 1 ]; then
        echo "[dry-run] Would build: ${pkg_name}_${version}_${arch}.deb from ${name}/"
        continue
    fi

    echo "Building ${pkg_name} ${version} from ${name}/"

    # Remove any previous version of this package
    rm -f "${PACKAGES_DIR}/${pkg_name}_"*".deb"

    # Create staging directory
    staging="$(mktemp -d)"

    mkdir -p "$staging/DEBIAN"
    # Inject version from changelog into control
    sed "1a\\
Version: ${version}" "$dir/control" > "$staging/DEBIAN/control"

    # Process install manifest: <src> <dest-dir> <mode>
    while read -r src dest mode; do
        [ -z "$src" ] && continue
        mkdir -p "$staging$dest"
        cp "$dir/$src" "$staging$dest/$src"
        chmod "${mode:-0644}" "$staging$dest/$src"
    done < "$dir/install"

    # Process symlinks: <target> <link-path>
    if [ -f "$dir/links" ]; then
        while read -r target link_path; do
            [ -z "$target" ] && continue
            mkdir -p "$staging$(dirname "$link_path")"
            ln -s "$target" "$staging$link_path"
        done < "$dir/links"
    fi

    dpkg-deb --root-owner-group --build "$staging" \
        "${PACKAGES_DIR}/${pkg_name}_${version}_${arch}.deb"

    rm -rf "$staging"
done

if [ "$DRY_RUN" -eq 1 ]; then
    echo "[dry-run] Would regenerate ${PACKAGES_DIR}/Packages.gz"
    exit 0
fi

echo "Regenerating package index..."
(cd "${PACKAGES_DIR}" && dpkg-scanpackages . /dev/null | gzip -9c > Packages.gz)

echo "Done. Packages in ${PACKAGES_DIR}/:"
find "${PACKAGES_DIR}" -maxdepth 1 -name '*.deb' -printf '  %f\n' | sort