#!/usr/bin/env bash
# libtool-version-sync.sh — sync configure's macro_version/revision to host libtool.
#
# Autotools recipes that ship a pre-generated `configure` script (libiconv 1.17,
# gettext 0.21, and many others) embed the libtool release identifier at
# configure-generation time. When the host's libtool is later updated (for
# example, from 2.6.0 to 2.6.0.23-b08cb on Debian), the bundled configure
# declares an older macro_version than the running libtool binary, and
# libtool aborts with:
#
#     Version mismatch error.  This is libtool <host>, but the
#     definition of this LT_INIT comes from libtool <bundled>.
#     You should recreate aclocal.m4 with macros from <host>
#     and run autoconf again.
#
# Regenerating aclocal.m4 + configure inside every cross-compiled recipe is
# brittle and depends on autoconf/automake being available in the cookbook
# environment. The robust workaround used here is to rewrite the macro_version
# and macro_revision assignments inside the existing configure scripts so they
# match the host libtool's runtime version. configure then embeds the right
# version into the generated libtool helper, and the version check passes.
#
# Usage from a recipe's [build] script:
#
#     . "${COOKBOOK_SOURCE}/../../../../local/scripts/lib/libtool-version-sync.sh"
#     redbear_sync_libtool_version "${COOKBOOK_SOURCE}/configure" \
#         "${COOKBOOK_SOURCE}/libcharset/configure"
#
# The paths are script-relative because recipes can be in any category.

_redbear_libtool_version() {
    # The cookbook prepends the Redox cross sysroot's bin/ to PATH, so
    # `command -v libtool` can return the Redox-target libtool
    # (e.g. 2.5.4-redox-9510) instead of the host toolchain's libtool.
    # Search known host prefixes first to make sure we report the
    # actually-running libtool that the configure scripts will see at
    # compile time, not the cross-compile wrapper.
    local host_libtool
    for host_libtool in /usr/bin/libtool /bin/libtool /usr/local/bin/libtool; do
        if [ -x "${host_libtool}" ]; then
            "${host_libtool}" --version 2>/dev/null | head -n1 | awk '{print $NF}'
            return 0
        fi
    done
    if [ -f /usr/share/libtool/build-aux/ltmain.sh ]; then
        grep '^VERSION=' /usr/share/libtool/build-aux/ltmain.sh | head -n1 \
            | sed -E "s/^VERSION=['\"]?([^'\"]+)['\"]?$/\1/"
        return 0
    fi
    return 1
}

_redbear_libtool_revision() {
    local version="$1"
    # The "revision" is the <MAJOR>.<MINOR>.<PATCH> triple with the build-suffix
    # (e.g. 2.6.0.23-b08cb -> 2.6.0.23). Drop the trailing -<suffix> segment.
    printf '%s\n' "${version%%-*}"
}

redbear_sync_libtool_version() {
    local host_version host_revision path
    host_version="$(_redbear_libtool_version)" || {
        echo "redbear_sync_libtool_version: unable to detect host libtool version" >&2
        return 1
    }
    host_revision="$(_redbear_libtool_revision "${host_version}")"

    for path in "$@"; do
        [ -f "${path}" ] || continue
        _redbear_rewrite_configure_libtool_id "${path}" "${host_version}" "${host_revision}"
    done
}

_redbear_rewrite_configure_libtool_id() {
    local path="$1" host_version="$2" host_revision="$3"
    sed -i \
        -e "s/macro_version='2\.4\.7'/macro_version='${host_version}'/g" \
        -e "s/macro_version='2\.5\.4-redox-9510'/macro_version='${host_version}'/g" \
        -e "s/macro_version='2\.6\.0'/macro_version='${host_version}'/g" \
        -e "s/macro_revision='2\.4\.7'/macro_revision='${host_revision}'/g" \
        -e "s/macro_revision='2\.5\.4-redox-9510'/macro_revision='${host_revision}'/g" \
        -e "s/macro_revision='2\.6\.0'/macro_revision='${host_revision}'/g" \
        "${path}"
}