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382 lines
16 KiB
382 lines
16 KiB
# vim:set ft=sh:
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# Distfiles mirror:
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# https://archive.org/download/gentoo-bootstrap-2025.8/distfiles.tar/
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# Changelog:
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# - 2025.8:
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# - Set up a proper gentoo install using prefix, by building a bunch of tools
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# in a temporary prefix, and then cross-compiling a final prefix.
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# - Use crossdev to build the final system.
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# - Both of these changes make the instructions significantly more
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# future-proof, although there's still a lot of bugs to fix upstream, and
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# ways to lessen the amount of compilation needed.
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# - 2025:
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# - Upstreamed portage patch
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# - Cross-compile all packages in packages.build for the profile
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# (this simplifies the steps afterwards significantly)
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# - Pin to GCC 13 (gcc 14 isn't working...)
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# - Future proofing by ignoring HTTPs certificates
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# (portage verifies the checksums anyway)
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# - Avoid using wget (need to set FETCHCOMMAND anyway...)
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# - Future proofing by not hardcoding a python version
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# - 2024.8:
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# - Rewrite bootstrap to avoid using LFS
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# - Pin the repository version
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# - 2024:
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# - Initial version
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# Overview of bootstrap:
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# step 0: Build live-bootstrap as a starting point
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# step 1: Install a temporary copy of portage to /tmp/portage
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# step 2: Setup a prefix-guest using the live-bootstrap toolchain, build a few additional tools
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# step 3: Set up a target prefix, build glibc, and a cross compiler targetting it
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# step 4: Build portage and necessary utilities for the target prefix
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# step 5: Switch to it and emerge the rest of @world
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# step 6: Install crossdev and build the final system
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# Build live-bootstrap
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git clone https://github.com/fosslinux/live-bootstrap
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git -C live-bootstrap checkout 63b24502c7e5bad7db5ee1d2005db4cc5905ab74
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git -C live-bootstrap submodule update --init --recursive --depth=1 --progress
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cd live-bootstrap
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python3 -m venv env
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env/bin/pip install -U --no-binary :all: pip
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env/bin/pip install -v --no-binary :all: requests
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./download-distfiles.sh
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#sudo -s # if not root already
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umask 022
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env/bin/python ./rootfs.py -c --external-sources --cores $(nproc) -m ''
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umount target/dev/shm # double mounted?
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umount target/dev/shm target/sys target/proc target/tmp
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# Optional: Back up the system
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rm -r target/dev/* # allow extracting as non-root
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env -i chroot target tar --exclude='/external' --sort=name -cf /target.tar /
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env -i chroot target bzip2 -9v /target.tar
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mv target/external/repo .
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mv target/target.tar.bz2 .
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rm -rf target/external
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# Optional: Keep distfiles in one place
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mkdir -p target/var/cache/distfiles
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mount --bind distfiles target/var/cache/distfiles
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# Chroot into the live-bootstrap system
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cd target
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mount -t proc proc proc
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mount -t sysfs sysfs sys
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mount -t devtmpfs devtmpfs dev
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mount -t devpts devpts dev/pts
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env -i TERM="$TERM" chroot . /bin/bash -l
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umask 022
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source /steps/env
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cd /tmp
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# Optional: Configure additional mirrors for missing/removed distfiles
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# This is a space-separated list of URLs, but full paths to local directories
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# can be added as well.
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export GENTOO_MIRRORS="/mirror http://distfiles.gentoo.org"
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mkdir -p /var/cache/distfiles; cd /var/cache/distfiles
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curl -LO http://gitweb.gentoo.org/proj/portage.git/snapshot/portage-3.0.68.tar.bz2
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curl -LO http://distfiles.gentoo.org/snapshots/squashfs/gentoo-20250801.xz.sqfs
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curl -LO https://github.com/plougher/squashfs-tools/archive/refs/tags/4.7.2/squashfs-tools-4.7.2.tar.gz
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cd /tmp
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# TODO: gentoo currently uses squashfs-tools-4.7, but that fails to build, upgraded to 4.7.2
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# Build squashfs-tools to extract the ::gentoo tree
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# TODO: Include in live-bootstrap proper
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tar xf /var/cache/distfiles/squashfs-tools-4.7.2.tar.gz
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cd squashfs-tools-4.7.2
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make -C squashfs-tools install \
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INSTALL_PREFIX=/usr \
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LZO_SUPPORT=0 LZ4_SUPPORT=0 ZSTD_SUPPORT=0
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cd ..
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rm -rf squashfs-tools-4.7.2
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# Make some additional root modifications
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cp /usr/include/asm-generic/mman.h /usr/include/asm # needed by dev-libs/openssl
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# Unpack the ::gentoo tree
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unsquashfs /var/cache/distfiles/gentoo-20250801.xz.sqfs
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mkdir -p /var/db/repos
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rm -rf /var/db/repos/gentoo
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mv squashfs-root /var/db/repos/gentoo
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# Install temporary copy of portage
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tar xf /var/cache/distfiles/portage-3.0.68.tar.bz2
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ln -sfT portage-3.0.68 portage
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# Add portage user/group
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echo 'portage:x:250:250:portage:/var/tmp/portage:/bin/false' >> /etc/passwd
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echo 'portage::250:portage' >> /etc/group
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# Create cross repository
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mkdir -p /var/db/repos/cross/profiles
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echo cross > /var/db/repos/cross/profiles/repo_name
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mkdir -p /var/db/repos/cross/metadata
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printf '%s\n' 'masters = gentoo' 'thin-manifests = true' \
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> /var/db/repos/cross/metadata/layout.conf
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mkdir -p /var/db/repos/cross/cross-base
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ln -sfT /var/db/repos/gentoo/sys-devel/binutils /var/db/repos/cross/cross-base/binutils
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ln -sfT /var/db/repos/gentoo/sys-devel/gcc /var/db/repos/cross/cross-base/gcc
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mkdir -p /var/db/repos/cross/cross-base/glibc
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printf '%s\n' EAPI=8 SLOT=0 KEYWORDS='"*"' > /var/db/repos/cross/cross-base/glibc/glibc-0.ebuild
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# Register i686-cross-linux-gnu toolchain
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echo cross-i686-cross-linux-gnu >> /var/db/repos/cross/profiles/categories
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ln -sfT cross-base /var/db/repos/cross/cross-i686-cross-linux-gnu
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# Configure prefix for host tools
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mkdir -p /cross/etc/portage/make.profile
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cat > /cross/etc/portage/make.profile/make.defaults << 'EOF'
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FETCHCOMMAND="curl -k --retry 3 -y 60 --ftp-pasv -o \"\${DISTDIR}/\${FILE}\" -L \"\${URI}\""
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RESUMECOMMAND="curl -C - -k --retry 3 -y 60 --ftp-pasv -o \"\${DISTDIR}/\${FILE}\" -L \"\${URI}\""
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FEATURES="-news -sandbox -usersandbox -pid-sandbox -ipc-sandbox -network-sandbox -parallel-fetch"
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BINPKG_COMPRESS=bzip2
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CLEAN_DELAY=0
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ARCH=x86
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ACCEPT_KEYWORDS="$ARCH"
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CHOST=i686-unknown-linux-musl
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IUSE_IMPLICIT="prefix prefix-guest kernel_linux elibc_musl elibc_glibc sparc m68k alpha amd64 x86"
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USE="prefix prefix-guest kernel_linux elibc_musl x86 python_targets_python3_13"
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C_INCLUDE_PATH="$EROOT/usr/include"
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CPLUS_INCLUDE_PATH="$EROOT/usr/include"
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LIBRARY_PATH="$EROOT/usr/lib"
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PKG_CONFIG_PATH="$EROOT/usr/lib/pkgconfig:$EROOT/usr/share/pkgconfig"
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LDFLAGS="-Wl,--disable-new-dtags,-rpath,$EPREFIX/usr/lib"
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EOF
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cat > /cross/etc/portage/repos.conf << 'EOF'
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[cross]
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location = /var/db/repos/cross
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EOF
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cat > /cross/etc/portage/package.use << 'EOF'
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dev-lang/perl minimal
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dev-libs/libxml2 -python
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sys-apps/file -seccomp
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sys-apps/util-linux -su
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cross-i686-cross-linux-gnu/gcc -sanitize -fortran openmp
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EOF
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cat > /cross/etc/portage/package.mask << 'EOF'
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sys-devel/binutils
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sys-devel/gcc
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EOF
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cat > /cross/etc/portage/make.profile/package.provided << 'EOF'
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sys-devel/binutils-2.27
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sys-devel/gcc-6.2
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app-arch/xz-utils-0
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EOF
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mkdir -p /cross/etc/portage/env/cross-i686-cross-linux-gnu
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cat > /cross/etc/portage/env/cross-i686-cross-linux-gnu/gcc << '_EOF'
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EXTRA_ECONF='--with-sysroot=/gentoo'
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post_src_install() {
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cat > "$ED/usr/lib/gcc/$CTARGET/specs" << 'EOF'
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*link:
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+ %{!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}}}}
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EOF
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}
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_EOF
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mkdir -p /cross/etc/portage/env/dev-lang
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cat > /cross/etc/portage/env/dev-lang/python << 'EOF'
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pre_src_prepare() {
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sed -i 's/\[MULTIARCH=\$(.*\]/[MULTIARCH=]/' configure.ac || die
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}
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EOF
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mkdir -p /cross/etc/portage/env/dev-build
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echo 'CFLAGS=-std=c17' > /cross/etc/portage/env/dev-build/make
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# TODO: Upgrade to findutils 4.9 for portage, and add pax-utils for "scanelf". Both of these are required by portage's `estrip`
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# Initialize environment
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PORTAGE_OVERRIDE_EPREFIX=/cross ./portage/bin/emerge -D1n sys-apps/baselayout
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echo 'PATH=/usr/bin' > /cross/etc/env.d/99host
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PORTAGE_OVERRIDE_EPREFIX=/cross ./portage/bin/env-update
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mkdir -p /cross/bin
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ln -sf /bin/sh /cross/bin # Required by sys-devel/gcc
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ln -sf /bin/bash /cross/bin # Required by eautoreconf
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# Build tools missing from/broken in live-bootstrap
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# TODO: Include in live-bootstrap proper
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PORTAGE_OVERRIDE_EPREFIX=/cross MAKEOPTS=-j1 ./portage/bin/emerge -D1n dev-build/make # make in live-bootstrap has trouble with parallel builds under portage
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PORTAGE_OVERRIDE_EPREFIX=/cross ./portage/bin/emerge -D1n net-misc/rsync # https://bugs.gentoo.org/963902
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# Configure target prefix
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mkdir -p /gentoo/etc/portage
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ln -sfT /var/db/repos/gentoo/profiles/default/linux/x86/23.0/i686/prefix/kernel-3.2+ /gentoo/etc/portage/make.profile
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cat > /gentoo/etc/portage/make.conf << 'EOF'
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FETCHCOMMAND="curl -k --retry 3 -y 60 --ftp-pasv -o \"\${DISTDIR}/\${FILE}\" -L \"\${URI}\""
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RESUMECOMMAND="curl -C - -k --retry 3 -y 60 --ftp-pasv -o \"\${DISTDIR}/\${FILE}\" -L \"\${URI}\""
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FEATURES="-news -sandbox -usersandbox -pid-sandbox -ipc-sandbox -network-sandbox -parallel-fetch"
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BINPKG_COMPRESS=bzip2
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CLEAN_DELAY=0
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PORTDIR=/var/db/repos/gentoo
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DISTDIR=/var/cache/distfiles
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PORTAGE_TMPDIR=/var/tmp
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CHOST=i686-cross-linux-gnu
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ACCEPT_KEYWORDS="-~$ARCH"
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USE=-nls
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INSTALL_MASK=/etc/env.d/99host
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EOF
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mkdir -p /gentoo/etc/portage/profile
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cat > /gentoo/etc/portage/profile/package.use << 'EOF'
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sys-devel/gcc -sanitize -fortran
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app-arch/gzip pic
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EOF
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cat > /gentoo/etc/portage/profile/package.accept_keywords << 'EOF'
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~net-misc/curl-8.15.0 # Fix bug that prevents --ftp-pasv from working
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EOF
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cat > /gentoo/etc/portage/bashrc << 'EOF'
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if [ "$CBUILD" = i686-unknown-linux-musl ]; then
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export BUILD_CFLAGS="-I$BROOT/usr/include"
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export BUILD_LDFLAGS="-L$BROOT/usr/lib -Wl,--disable-new-dtags,-rpath,$BROOT/usr/lib"
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export PKG_CONFIG_LIBDIR="$EROOT/usr/lib/pkgconfig:$EROOT/usr/share/pkgconfig"
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export PKG_CONFIG_SYSTEM_INCLUDE_PATH="$EROOT/usr/include"
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export PKG_CONFIG_SYSTEM_LIBRARY_PATH="$EROOT/lib:$EROOT/usr/lib"
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export CONFIG_SITE="$EROOT/etc/portage/config.site"
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fi
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EOF
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cat > /gentoo/etc/portage/config.site << 'EOF'
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ac_cv_file__dev_ptmx=yes # dev-lang/python
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ac_cv_file__dev_ptc=no # dev-lang/python
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gl_cv_func_strcasecmp_works=yes # sys-apps/diffutils
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EOF
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mkdir -p /gentoo/etc/portage/env/dev-lang
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cat > /gentoo/etc/portage/env/dev-lang/python << '_EOF'
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if [ "$CBUILD" = i686-unknown-linux-musl ]; then
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pre_src_prepare() {
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sed -i 's/\[MULTIARCH=\$(.*\]/[MULTIARCH=]/' configure.ac || die
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}
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fi
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_EOF
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# Initialize prefix
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PORTAGE_OVERRIDE_EPREFIX=/gentoo USE=build ./portage/bin/emerge -D1n sys-apps/baselayout
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echo 'man:x:13:15:System user; man:/dev/null:/sbin/nologin' >> /gentoo/etc/passwd
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echo 'man:x:15:' >> /gentoo/etc/group
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# TODO: The acct-user and acct-group should create the groups honestly
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# Build libc and adapt compiler for target prefix
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# Usually, CC and CXX should be the CHOST compilers, to cross compile. However, they're compatible enough here.
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# Using --nodeps because the live-bootstrap environment is guaranteed to provide enough to build glibc
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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
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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
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PORTAGE_OVERRIDE_EPREFIX=/cross ./portage/bin/emerge -D1n cross-i686-cross-linux-gnu/glibc # Dummy package to use proper flags in gcc
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PORTAGE_OVERRIDE_EPREFIX=/cross ./portage/bin/emerge -D1n cross-i686-cross-linux-gnu/binutils # TODO: cross-gcc doesn't depend on the right binutils
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PORTAGE_OVERRIDE_EPREFIX=/cross ./portage/bin/emerge -D1n cross-i686-cross-linux-gnu/gcc
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# Build compiler and initial tools for prefix
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PORTAGE_OVERRIDE_EPREFIX=/cross ./portage/bin/emerge -D1n sys-libs/ncurses # https://bugs.gentoo.org/963660
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PORTAGE_OVERRIDE_EPREFIX=/cross ./portage/bin/emerge -D1n dev-lang/python # TODO: dev-util/re2c requires dev-lang/python
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PORTAGE_OVERRIDE_EPREFIX=/cross PORTAGE_CONFIGROOT=/gentoo EPREFIX=/gentoo CBUILD=i686-unknown-linux-musl USE=build ./portage/bin/emerge -D1n \
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app-alternatives/awk \
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app-alternatives/gzip \
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app-shells/bash \
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dev-build/make \
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sys-apps/coreutils \
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sys-apps/diffutils \
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sys-apps/grep \
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sys-apps/portage \
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sys-apps/sed \
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sys-devel/binutils \
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sys-devel/gcc \
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sys-devel/patch
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# Finalize prefix
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/gentoo/usr/bin/emerge -DUu @world
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/gentoo/usr/bin/emerge -c
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# Optional: Back up
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tar --sort=name -cf /gentoo.tar /gentoo
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bzip2 -9v /gentoo.tar
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# Create a cross compiler
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/gentoo/usr/bin/emerge -Dn sys-devel/crossdev app-eselect/eselect-repository sys-apps/shadow
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( . /gentoo/etc/profile; eselect repository create crossdev )
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mkdir -p /gentoo/etc/portage/profile/package.use.mask
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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
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( . /gentoo/etc/profile; crossdev -A 'amd64 x86' -S -P -v x86_64-pc-linux-gnu )
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# Configure new system
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( . /gentoo/etc/profile; PORTAGE_CONFIGROOT=/gentoo/usr/x86_64-pc-linux-gnu eselect profile set --force default/linux/amd64/23.0 )
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( m=/gentoo/usr/x86_64-pc-linux-gnu/etc/portage/make.conf; \
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test -f "$m" && mv "$m" "$m.tmp" && mkdir "$m" && mv "$m.tmp" "$m/0100_crossdev.conf" )
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cat > /gentoo/usr/x86_64-pc-linux-gnu/etc/portage/make.conf/1000_make.conf << 'EOF'
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FEATURES="$FEATURES -news -sandbox -usersandbox -pid-sandbox -ipc-sandbox -network-sandbox -parallel-fetch"
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PORTDIR=/var/db/repos/gentoo
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DISTDIR=/var/cache/distfiles
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ACCEPT_KEYWORDS="-~$ARCH"
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CONFIG_SITE=/gentoo/usr/share/config.site # Needed because --prefix for target != /gentoo/usr
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EOF
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cat > /gentoo/usr/x86_64-pc-linux-gnu/etc/portage/bashrc << 'EOF'
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export SOURCE_DATE_EPOCH=315532800 # 1980-01-01, because 0 is too old for zip files (e.g. python wheels)
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EOF
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mkdir -p /gentoo/usr/x86_64-pc-linux-gnu/etc/portage/env/dev-libs
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cat > /gentoo/usr/x86_64-pc-linux-gnu/etc/portage/env/dev-libs/libassuan << 'EOF'
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# https://bugs.gentoo.org/962780
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export GPGRT_CONFIG="$ESYSROOT/usr/bin/$CHOST-gpgrt-config"
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EOF
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cat > /gentoo/usr/x86_64-pc-linux-gnu/etc/portage/env/dev-libs/libgcrypt << 'EOF'
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# https://bugs.gentoo.org/963810
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export GPGRT_CONFIG="$ESYSROOT/usr/bin/$CHOST-gpgrt-config"
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EOF
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cat > /gentoo/usr/x86_64-pc-linux-gnu/etc/portage/env/dev-libs/libksba << 'EOF'
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# https://bugs.gentoo.org/963811
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export GPGRT_CONFIG="$ESYSROOT/usr/bin/$CHOST-gpgrt-config"
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EOF
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# Work around an ebuild bug
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ln -s /gentoo/lib/ld-linux.so.2 /lib # https://bugs.gentoo.org/962756
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# Cross compile the new system
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( . /gentoo/etc/profile; USE=build x86_64-pc-linux-gnu-emerge -D1n sys-apps/baselayout )
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( . /gentoo/etc/profile; x86_64-pc-linux-gnu-emerge -DUu @world )
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# Create final rootfs
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( . /gentoo/etc/profile; ROOT=/target USE=build x86_64-pc-linux-gnu-emerge -KDU1n sys-apps/baselayout )
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( . /gentoo/etc/profile; ROOT=/target x86_64-pc-linux-gnu-emerge -KDUu @world )
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# Set up final system
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mkdir -p /target/etc/portage
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ln -sfT ../../var/db/repos/gentoo/profiles/default/linux/amd64/23.0 /target/etc/portage/make.profile
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echo 'nameserver 1.1.1.1' > /target/etc/resolv.conf
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echo 'C.UTF8 UTF-8' > /target/etc/locale.gen
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# This is the point where you have to move from the x86 system to an x86_64 system.
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# Make sure that you are running a x86_64 kernel before chrooting, or booting it.
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exit
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umount dev/pts dev sys proc
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umount var/cache/distfiles
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# Optional: Back up the system
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env -i chroot target tar --sort=name -cf /target-gentoo.tar /
|
|
env -i chroot target bzip2 -9v /target-gentoo.tar
|
|
mv target/target-gentoo.tar.bz2 ..
|
|
|
|
# Copy ::gentoo repo and distfiles
|
|
mkdir -p target/var/db/repos
|
|
rsync -a var/db/repos/gentoo/ target/var/db/repos/gentoo
|
|
rsync -a var/cache/distfiles/ target/var/cache/distfiles
|
|
|
|
# Enter the final, x86_64 system
|
|
cd target
|
|
mount -t proc proc proc
|
|
mount -t sysfs sysfs sys
|
|
mount -t devtmpfs devtmpfs dev
|
|
mount -t devpts devpts dev/pts
|
|
env -i TERM="$TERM" chroot . /bin/bash -l
|
|
|
|
umask 022
|
|
|
|
# Initialize system and break dependency cycles
|
|
ldconfig
|
|
USE='-nls' emerge -1n sys-devel/gettext
|
|
|
|
# Rebuild everything
|
|
emerge -e @world
|
|
|