7.4. Copy selected build variables and helper functions into target profile

Before entering chroot, write a target profile file that carries selected book variables into the new environment.

This step intentionally excludes these host-path and mirror variables:

• LBI_ROOT
• LBI_TOOLS
• LBI_SOURCES
• LBI_BOOT
• LBI_ESP_MOUNT

All commands in this section should be run as root.

Write the target profile with cat <<EOF

dollar='$'
cat > "$LBI_ROOT/system/configuration/profile" <<EOF
# Linux by Intent variable handoff profile

export LBI_ARCH="${LBI_ARCH:- }"
export LBI_TARGET="${LBI_TARGET:- }"
export LWI_MAKE_JOBS="${LWI_MAKE_JOBS:- }"
export LWI_MAKE_FLAGS="${LWI_MAKE_FLAGS:- }"
export LWI_CFLAGS="${LWI_CFLAGS:- }"
export LWI_CXXFLAGS="${LWI_CXXFLAGS:- }"
export LBI_CUSTOM_LDFLAGS="${LBI_CUSTOM_LDFLAGS:- }"
export LBI_BOOTLOADER_ID="${LBI_BOOTLOADER_ID:- }"

lbi_configure() {
    CFLAGS="${LWI_CFLAGS}" \
    CXXFLAGS="${LWI_CXXFLAGS}" \
    LDFLAGS="${LBI_CUSTOM_LDFLAGS}" \
    ./configure \
        --prefix=/system \
        --bindir=/system/binaries \
        --sbindir=/system/systembinaries \
        --libdir=/system/libraries \
        --libexecdir=/system/systembinaries \
        --includedir=/system/headers \
        --sysconfdir=/system/configuration \
        --localstatedir=/system/variable \
        --mandir=/system/documentation/man-pages \
        --infodir=/system/documentation/info \
        "${dollar}@"
}

lbi_meson() {
    lbi_meson_builddir=build

    case "${dollar}{1-}" in
        '') ;;
        -*) ;;
        *)
            lbi_meson_builddir=${dollar}1
            shift
            ;;
    esac

    meson setup "${dollar}lbi_meson_builddir" \
        --prefix=/system \
        --bindir=/system/binaries \
        --sbindir=/system/systembinaries \
        --libdir=/system/libraries \
        --libexecdir=/system/systembinaries \
        --includedir=/system/headers \
        --sysconfdir=/system/configuration \
        --localstatedir=/system/variable \
        --mandir=/system/documentation/man-pages \
        --infodir=/system/documentation/info \
        "${dollar}@"
}

lbi_cmake() {
    lbi_cmake_builddir=build

    case "${dollar}{1-}" in
        '') ;;
        -*) ;;
        *)
            lbi_cmake_builddir=${dollar}1
            shift
            ;;
    esac

    cmake -S . -B "${dollar}lbi_cmake_builddir" \
        -DCMAKE_INSTALL_PREFIX=/system \
        -DCMAKE_INSTALL_BINDIR=/system/binaries \
        -DCMAKE_INSTALL_SBINDIR=/system/systembinaries \
        -DCMAKE_INSTALL_LIBDIR=/system/libraries \
        -DCMAKE_INSTALL_LIBEXECDIR=/system/systembinaries \
        -DCMAKE_INSTALL_INCLUDEDIR=/system/headers \
        -DCMAKE_INSTALL_SYSCONFDIR=/system/configuration \
        -DCMAKE_INSTALL_LOCALSTATEDIR=/system/variable \
        -DCMAKE_INSTALL_MANDIR=/system/documentation/man-pages \
        -DCMAKE_INSTALL_INFODIR=/system/documentation/info \
        "${dollar}@"
}
EOF

Because the heredoc delimiter is unquoted (<<EOF), the file receives the current values at write time. The ${VAR:- } form makes each missing or empty value become a single space.

Quick verification

cat "$LBI_ROOT/system/configuration/profile"

Command Explanations

• dollar='$': Stores a literal dollar sign so the generated profile can contain variables that expand later inside the chroot.
• cat > "$LBI_ROOT/system/configuration/profile" <<EOF: Writes the target login profile used by later chroot shells.
• export LBI_ARCH, LBI_TARGET, LWI_MAKE_JOBS, LWI_MAKE_FLAGS, LWI_CFLAGS, and LWI_CXXFLAGS: Carries the selected build identity and tuning variables into the target environment.
• export LBI_CUSTOM_LDFLAGS: Preserves local linker tuning for package builds that still consume the linker flag variable.
• lbi_configure, lbi_meson, and lbi_cmake: Defines the same install-layout helper functions inside the target profile for chapter 8 builds.
• export PATH=/system/binaries:/system/systembinaries: Keeps target commands ahead of any compatibility paths inside the chroot.
• cat "$LBI_ROOT/system/configuration/profile": Prints the generated profile for review before entering the target environment.