FROM live-bootstrap

#mkdir -p /var/cache/distfiles; cd /var/cache/distfiles
#curl -LO http://gitweb.gentoo.org/proj/portage.git/snapshot/portage-3.0.68.tar.bz2
#curl -LO http://distfiles.gentoo.org/snapshots/squashfs/gentoo-20250801.xz.sqfs
#curl -LO https://github.com/plougher/squashfs-tools/archive/refs/tags/4.7.2/squashfs-tools-4.7.2.tar.gz
## TODO: gentoo currently uses squashfs-tools-4.7, but that fails to build, upgraded to 4.7.2

WORKDIR /tmp

# Build squashfs-tools to extract the ::gentoo tree
# TODO: Include in live-bootstrap proper
RUN tar xf /var/cache/distfiles/squashfs-tools-4.7.2.tar.gz && \
    cd squashfs-tools-4.7.2 && \
    make -C squashfs-tools install \
        INSTALL_PREFIX=/usr \
        LZO_SUPPORT=0 LZ4_SUPPORT=0 ZSTD_SUPPORT=0 && \
    cd .. && \
    rm -rf squashfs-tools-4.7.2

# Make some additional root modifications
RUN cp /usr/include/asm-generic/mman.h /usr/include/asm  # needed by dev-libs/openssl

# Unpack the ::gentoo tree
RUN unsquashfs /var/cache/distfiles/gentoo-20250801.xz.sqfs && \
    mkdir -p /var/db/repos && \
    rm -rf /var/db/repos/gentoo && \
    mv squashfs-root /var/db/repos/gentoo

# Install temporary copy of portage
RUN tar xf /var/cache/distfiles/portage-3.0.68.tar.bz2 && \
    ln -sfT portage-3.0.68 portage

# Add portage user/group
RUN echo 'portage:x:250:250:portage:/var/tmp/portage:/bin/false' >> /etc/passwd && \
    echo 'portage::250:portage' >> /etc/group

# Create cross repository
RUN <<'EOR'
mkdir -p /var/db/repos/cross/profiles
echo cross > /var/db/repos/cross/profiles/repo_name
mkdir -p /var/db/repos/cross/metadata
printf '%s\n' 'masters = gentoo' 'thin-manifests = true' \
    > /var/db/repos/cross/metadata/layout.conf
mkdir -p /var/db/repos/cross/cross-base
ln -sfT /var/db/repos/gentoo/sys-devel/binutils /var/db/repos/cross/cross-base/binutils
ln -sfT /var/db/repos/gentoo/sys-devel/gcc /var/db/repos/cross/cross-base/gcc
mkdir -p /var/db/repos/cross/cross-base/glibc
printf '%s\n' EAPI=8 SLOT=0 KEYWORDS='"*"' > /var/db/repos/cross/cross-base/glibc/glibc-0.ebuild
EOR

# Register i686-cross-linux-gnu toolchain
RUN <<'EOR'
echo cross-i686-cross-linux-gnu >> /var/db/repos/cross/profiles/categories
ln -sfT cross-base /var/db/repos/cross/cross-i686-cross-linux-gnu
EOR

# Configure prefix for host tools
RUN <<'EOR'
mkdir -p /cross/etc/portage/make.profile
cat > /cross/etc/portage/make.profile/make.defaults << 'EOF'
FETCHCOMMAND="curl -k --retry 3 -y 60 --ftp-pasv -o \"\${DISTDIR}/\${FILE}\" -L \"\${URI}\""
RESUMECOMMAND="curl -C - -k --retry 3 -y 60 --ftp-pasv -o \"\${DISTDIR}/\${FILE}\" -L \"\${URI}\""
FEATURES="-news -sandbox -usersandbox -pid-sandbox -ipc-sandbox -network-sandbox -parallel-fetch"
BINPKG_COMPRESS=bzip2
CLEAN_DELAY=0

ARCH=x86
ACCEPT_KEYWORDS="$ARCH"
CHOST=i686-unknown-linux-musl
IUSE_IMPLICIT="prefix prefix-guest kernel_linux elibc_musl elibc_glibc sparc m68k alpha amd64 x86"
USE="prefix prefix-guest kernel_linux elibc_musl x86 python_targets_python3_13"

C_INCLUDE_PATH="$EROOT/usr/include"
CPLUS_INCLUDE_PATH="$EROOT/usr/include"
LIBRARY_PATH="$EROOT/usr/lib"
PKG_CONFIG_PATH="$EROOT/usr/lib/pkgconfig:$EROOT/usr/share/pkgconfig"
LDFLAGS="-Wl,--disable-new-dtags,-rpath,$EPREFIX/usr/lib"
EOF
cat > /cross/etc/portage/repos.conf << 'EOF'
[cross]
location = /var/db/repos/cross
EOF
cat > /cross/etc/portage/package.use << 'EOF'
dev-lang/perl minimal
dev-libs/libxml2 -python
sys-apps/file -seccomp
sys-apps/util-linux -su
cross-i686-cross-linux-gnu/gcc -sanitize -fortran openmp
EOF
cat > /cross/etc/portage/make.profile/package.provided << 'EOF'
sys-devel/binutils-2.27
sys-devel/gcc-6.2
app-arch/xz-utils-0
EOF
mkdir -p /cross/etc/portage/env/cross-i686-cross-linux-gnu
cat > /cross/etc/portage/env/cross-i686-cross-linux-gnu/gcc << '_EOF'
EXTRA_ECONF='--with-sysroot=/gentoo'
#EXTRA_ECONF="$EXTRA_ECONF --enable-shared --enable-threads=posix"  # TODO: test without
#EXTRA_ECONF="$EXTRA_ECONF --enable-host-shared"  # Needed because --enable-host-pie is enabled in ebuild, fixed in GCC 15
#EXTRA_ECONF="$EXTRA_ECONF --enable-host-bind-now"
#post_src_prepare() {
## Avoid configuration bug triggered by --disable-shared -enable-shared
#sed -i '/enable_shared | enable_static) ;;/d' config-ml.in || die
#}
post_src_install() {
cat > "$ED/usr/lib/gcc/$CTARGET/specs" << 'EOF'
*link:
+ %{!shared:%{!static:%{!static-pie:-dynamic-linker %{m64|mx32:;:/gentoo/lib/ld-linux.so.2}%{m64:/gentoo/lib64/ld-linux-x86-64.so.2}%{mx32:/gentoo/libx32/ld-linux-x32.so.2}}}}
EOF
}
_EOF
mkdir -p /cross/etc/portage/env/dev-lang
cat > /cross/etc/portage/env/dev-lang/python << 'EOF'
pre_src_prepare() {
sed -i 's/\[MULTIARCH=\$(.*\]/[MULTIARCH=]/' configure.ac || die
}
EOF
mkdir -p /cross/etc/portage/env/dev-build
echo 'CFLAGS=-std=c17' > /cross/etc/portage/env/dev-build/make
EOR

# TODO: Upgrade to findutils 4.9 for portage, and add pax-utils for "scanelf". Both of these are required by portage's `estrip`

# Initialize environment
RUN PORTAGE_OVERRIDE_EPREFIX=/cross ./portage/bin/emerge -D1n sys-apps/baselayout
RUN echo 'PATH=/usr/bin' > /cross/etc/env.d/99host && \
    PORTAGE_OVERRIDE_EPREFIX=/cross ./portage/bin/env-update
RUN mkdir -p /cross/bin
RUN ln -sf /bin/sh /cross/bin  # Required by sys-devel/gcc
RUN ln -sf /bin/bash /cross/bin  # Required by eautoreconf

# Build tools missing from/broken in live-bootstrap
# TODO: Include in live-bootstrap proper
RUN PORTAGE_OVERRIDE_EPREFIX=/cross MAKEOPTS=-j1 ./portage/bin/emerge -D1n dev-build/make  # make in live-bootstrap has trouble with parallel builds under portage
RUN PORTAGE_OVERRIDE_EPREFIX=/cross ./portage/bin/emerge -D1n net-misc/rsync  # https://bugs.gentoo.org/963902

# Configure target prefix
RUN <<'EOR'
mkdir -p /gentoo/etc/portage
ln -sfT /var/db/repos/gentoo/profiles/default/linux/x86/23.0/i686/prefix/kernel-3.2+ /gentoo/etc/portage/make.profile
cat > /gentoo/etc/portage/make.conf << 'EOF'
FETCHCOMMAND="curl -k --retry 3 -y 60 --ftp-pasv -o \"\${DISTDIR}/\${FILE}\" -L \"\${URI}\""
RESUMECOMMAND="curl -C - -k --retry 3 -y 60 --ftp-pasv -o \"\${DISTDIR}/\${FILE}\" -L \"\${URI}\""
FEATURES="-news -sandbox -usersandbox -pid-sandbox -ipc-sandbox -network-sandbox -parallel-fetch"
BINPKG_COMPRESS=bzip2
CLEAN_DELAY=0

PORTDIR=/var/db/repos/gentoo
DISTDIR=/var/cache/distfiles
PORTAGE_TMPDIR=/var/tmp

CHOST=i686-cross-linux-gnu
ACCEPT_KEYWORDS="-~$ARCH"
USE=-nls
INSTALL_MASK=/etc/env.d/99host
EOF
mkdir -p /gentoo/etc/portage/profile
cat > /gentoo/etc/portage/profile/package.use << 'EOF'
sys-devel/gcc -sanitize -fortran
app-arch/gzip pic
EOF
cat > /gentoo/etc/portage/profile/package.accept_keywords << 'EOF'
~net-misc/curl-8.15.0  # Fix bug that prevents --ftp-pasv from working
EOF
cat > /gentoo/etc/portage/bashrc << 'EOF'
if [ "$CBUILD" = i686-unknown-linux-musl ]; then
export BUILD_CFLAGS="-I$BROOT/usr/include"
export BUILD_LDFLAGS="-L$BROOT/usr/lib -Wl,--disable-new-dtags,-rpath,$BROOT/usr/lib"
export PKG_CONFIG_LIBDIR="$EROOT/usr/lib/pkgconfig:$EROOT/usr/share/pkgconfig"
export PKG_CONFIG_SYSTEM_INCLUDE_PATH="$EROOT/usr/include"
export PKG_CONFIG_SYSTEM_LIBRARY_PATH="$EROOT/lib:$EROOT/usr/lib"
export CONFIG_SITE="$EROOT/etc/portage/config.site"
fi
EOF
cat > /gentoo/etc/portage/config.site << 'EOF'
ac_cv_file__dev_ptmx=yes  # dev-lang/python
ac_cv_file__dev_ptc=no  # dev-lang/python
gl_cv_func_strcasecmp_works=yes  # sys-apps/diffutils
EOF
mkdir -p /gentoo/etc/portage/env/dev-lang
cat > /gentoo/etc/portage/env/dev-lang/python << '_EOF'
if [ "$CBUILD" = i686-unknown-linux-musl ]; then
pre_src_prepare() {
sed -i 's/\[MULTIARCH=\$(.*\]/[MULTIARCH=]/' configure.ac || die
}
fi
_EOF
EOR

# Initialize prefix
RUN PORTAGE_OVERRIDE_EPREFIX=/gentoo USE=build ./portage/bin/emerge -D1n sys-apps/baselayout
RUN echo 'man:x:13:15:System user; man:/dev/null:/sbin/nologin' >> /gentoo/etc/passwd && \
    echo 'man:x:15:' >> /gentoo/etc/group
# TODO: The acct-user and acct-group should create the groups honestly

# Build libc and adapt compiler for target prefix
# Usually, CC and CXX should be the CHOST compilers, to cross compile. However, they're compatible enough here.
# Using --nodeps because the live-bootstrap environment is guaranteed to provide enough to build glibc
RUN PORTAGE_OVERRIDE_EPREFIX=/cross PORTAGE_CONFIGROOT=/gentoo EPREFIX=/gentoo CBUILD=i686-unknown-linux-musl CC=i686-unknown-linux-musl-gcc CXX=i686-unknown-linux-musl-g++ BOOTSTRAP_RAP=y ./portage/bin/emerge -O1n sys-kernel/linux-headers
RUN PORTAGE_OVERRIDE_EPREFIX=/cross PORTAGE_CONFIGROOT=/gentoo EPREFIX=/gentoo CBUILD=i686-unknown-linux-musl CC=i686-unknown-linux-musl-gcc CXX=i686-unknown-linux-musl-g++ BOOTSTRAP_RAP=y ./portage/bin/emerge -O1n sys-libs/glibc
RUN PORTAGE_OVERRIDE_EPREFIX=/cross ./portage/bin/emerge -D1n cross-i686-cross-linux-gnu/glibc  # Dummy package to use proper flags in gcc
RUN PORTAGE_OVERRIDE_EPREFIX=/cross ./portage/bin/emerge -D1n cross-i686-cross-linux-gnu/binutils  # TODO: cross-gcc doesn't depend on the right binutils
RUN PORTAGE_OVERRIDE_EPREFIX=/cross ./portage/bin/emerge -D1n cross-i686-cross-linux-gnu/gcc

# Build compiler and initial tools for prefix
RUN PORTAGE_OVERRIDE_EPREFIX=/cross ./portage/bin/emerge -D1n sys-libs/ncurses  # https://bugs.gentoo.org/963660
RUN PORTAGE_OVERRIDE_EPREFIX=/cross ./portage/bin/emerge -D1n dev-lang/python  # TODO: dev-util/re2c requires dev-lang/python
RUN PORTAGE_OVERRIDE_EPREFIX=/cross PORTAGE_CONFIGROOT=/gentoo EPREFIX=/gentoo CBUILD=i686-unknown-linux-musl USE=build ./portage/bin/emerge -D1n \
    app-alternatives/awk \
    app-alternatives/gzip \
    app-shells/bash \
    dev-build/make \
    sys-apps/coreutils \
    sys-apps/diffutils \
    sys-apps/grep \
    sys-apps/portage \
    sys-apps/sed \
    sys-devel/binutils \
    sys-devel/gcc \
    sys-devel/patch

# Finalize prefix
RUN /gentoo/usr/bin/emerge -DUu @world
RUN /gentoo/usr/bin/emerge -c

# Create a cross compiler
RUN /gentoo/usr/bin/emerge -Dn sys-devel/crossdev app-eselect/eselect-repository sys-apps/shadow
RUN ( . /gentoo/etc/profile; eselect repository create crossdev )
RUN mkdir -p /gentoo/etc/portage/profile/package.use.mask
RUN printf 'cross-x86_64-pc-linux-gnu/%s -multilib cet\n' linux-headers glibc binutils gcc gdb > /gentoo/etc/portage/profile/package.use.mask/cross-x86_64-pc-linux-gnu.multilib
RUN ( . /gentoo/etc/profile; crossdev -A 'amd64 x86' -S -P -v x86_64-pc-linux-gnu )

# Configure new system
RUN ( . /gentoo/etc/profile; PORTAGE_CONFIGROOT=/gentoo/usr/x86_64-pc-linux-gnu eselect profile set --force default/linux/amd64/23.0 )
RUN ( m=/gentoo/usr/x86_64-pc-linux-gnu/etc/portage/make.conf; \
    test -f "$m" && mv "$m" "$m.tmp" && mkdir "$m" && mv "$m.tmp" "$m/0100_crossdev.conf" )
RUN <<'EOR'
cat > /gentoo/usr/x86_64-pc-linux-gnu/etc/portage/make.conf/1000_make.conf << 'EOF'
FEATURES="$FEATURES -news -sandbox -usersandbox -pid-sandbox -ipc-sandbox -network-sandbox -parallel-fetch"
PORTDIR=/var/db/repos/gentoo
DISTDIR=/var/cache/distfiles

ACCEPT_KEYWORDS="-~$ARCH"
CONFIG_SITE=/gentoo/usr/share/config.site  # Needed because --prefix for target != /gentoo/usr
EOF
cat > /gentoo/usr/x86_64-pc-linux-gnu/etc/portage/bashrc << 'EOF'
export SOURCE_DATE_EPOCH=315532800  # 1980-01-01, because 0 is too old for zip files (e.g. python wheels)
EOF
mkdir -p /gentoo/usr/x86_64-pc-linux-gnu/etc/portage/env/dev-libs
cat > /gentoo/usr/x86_64-pc-linux-gnu/etc/portage/env/dev-libs/libassuan << 'EOF'
# https://bugs.gentoo.org/962780
export GPGRT_CONFIG="$ESYSROOT/usr/bin/$CHOST-gpgrt-config"
EOF
cat > /gentoo/usr/x86_64-pc-linux-gnu/etc/portage/env/dev-libs/libgcrypt << 'EOF'
# https://bugs.gentoo.org/963810
export GPGRT_CONFIG="$ESYSROOT/usr/bin/$CHOST-gpgrt-config"
EOF
cat > /gentoo/usr/x86_64-pc-linux-gnu/etc/portage/env/dev-libs/libksba << 'EOF'
# https://bugs.gentoo.org/963811
export GPGRT_CONFIG="$ESYSROOT/usr/bin/$CHOST-gpgrt-config"
EOF
EOR

# Work around an ebuild bug
RUN ln -s /gentoo/lib/ld-linux.so.2 /lib  # https://bugs.gentoo.org/962756

# Cross compile the new system
RUN ( . /gentoo/etc/profile; USE=build x86_64-pc-linux-gnu-emerge -D1n sys-apps/baselayout )
RUN ( . /gentoo/etc/profile; x86_64-pc-linux-gnu-emerge -DUu @world )

# Create final rootfs
RUN ( . /gentoo/etc/profile; ROOT=/target USE=build x86_64-pc-linux-gnu-emerge -KDU1n sys-apps/baselayout )
RUN ( . /gentoo/etc/profile; ROOT=/target x86_64-pc-linux-gnu-emerge -KDUu @world )