build-rootfs.sh

#!/usr/bin/env bash

set -e

usage()
{
    echo "Usage: $0 [BuildArch] [CodeName] [lldbx.y] [llvmx[.y]] [--skipunmount] --rootfsdir <directory>]"
    echo "BuildArch can be: arm(default), arm64, armel, armv6, ppc64le, riscv64, s390x, x64, x86"
    echo "CodeName - optional, Code name for Linux, can be: xenial(default), zesty, bionic, alpine"
    echo "                               for alpine can be specified with version: alpineX.YY or alpineedge"
    echo "                               for FreeBSD can be: freebsd13, freebsd14"
    echo "                               for illumos can be: illumos"
    echo "                               for Haiku can be: haiku."
    echo "lldbx.y - optional, LLDB version, can be: lldb3.9(default), lldb4.0, lldb5.0, lldb6.0 no-lldb. Ignored for alpine and FreeBSD"
    echo "llvmx[.y] - optional, LLVM version for LLVM related packages."
    echo "--skipunmount - optional, will skip the unmount of rootfs folder."
    echo "--skipsigcheck - optional, will skip package signature checks (allowing untrusted packages)."
    echo "--use-mirror - optional, use mirror URL to fetch resources, when available."
    echo "--jobs N - optional, restrict to N jobs."
    exit 1
}

__CodeName=xenial
__CrossDir=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
__BuildArch=arm
__AlpineArch=armv7
__FreeBSDArch=arm
__FreeBSDMachineArch=armv7
__IllumosArch=arm7
__HaikuArch=arm
__QEMUArch=arm
__UbuntuArch=armhf
__UbuntuRepo="http://ports.ubuntu.com/"
__LLDB_Package="liblldb-3.9-dev"
__SkipUnmount=0

# base development support
__UbuntuPackages="build-essential"

__AlpinePackages="alpine-base"
__AlpinePackages+=" build-base"
__AlpinePackages+=" linux-headers"
__AlpinePackages+=" lldb-dev"
__AlpinePackages+=" python3"
__AlpinePackages+=" libedit"

# symlinks fixer
__UbuntuPackages+=" symlinks"

# runtime dependencies
__UbuntuPackages+=" libicu-dev"
__UbuntuPackages+=" liblttng-ust-dev"
__UbuntuPackages+=" libunwind8-dev"
__UbuntuPackages+=" libnuma-dev"

__AlpinePackages+=" gettext-dev"
__AlpinePackages+=" icu-dev"
__AlpinePackages+=" libunwind-dev"
__AlpinePackages+=" lttng-ust-dev"
__AlpinePackages+=" compiler-rt"
__AlpinePackages+=" numactl-dev"

# runtime libraries' dependencies
__UbuntuPackages+=" libcurl4-openssl-dev"
__UbuntuPackages+=" libkrb5-dev"
__UbuntuPackages+=" libssl-dev"
__UbuntuPackages+=" zlib1g-dev"

__AlpinePackages+=" curl-dev"
__AlpinePackages+=" krb5-dev"
__AlpinePackages+=" openssl-dev"
__AlpinePackages+=" zlib-dev"

__FreeBSDBase="13.2-RELEASE"
__FreeBSDPkg="1.17.0"
__FreeBSDABI="13"
__FreeBSDPackages="libunwind"
__FreeBSDPackages+=" icu"
__FreeBSDPackages+=" libinotify"
__FreeBSDPackages+=" openssl"
__FreeBSDPackages+=" krb5"
__FreeBSDPackages+=" terminfo-db"

__IllumosPackages="icu"
__IllumosPackages+=" mit-krb5"
__IllumosPackages+=" openssl"
__IllumosPackages+=" zlib"

__HaikuPackages="gcc_syslibs"
__HaikuPackages+=" gcc_syslibs_devel"
__HaikuPackages+=" gmp"
__HaikuPackages+=" gmp_devel"
__HaikuPackages+=" icu66"
__HaikuPackages+=" icu66_devel"
__HaikuPackages+=" krb5"
__HaikuPackages+=" krb5_devel"
__HaikuPackages+=" libiconv"
__HaikuPackages+=" libiconv_devel"
__HaikuPackages+=" llvm12_libunwind"
__HaikuPackages+=" llvm12_libunwind_devel"
__HaikuPackages+=" mpfr"
__HaikuPackages+=" mpfr_devel"
__HaikuPackages+=" openssl"
__HaikuPackages+=" openssl_devel"
__HaikuPackages+=" zlib"
__HaikuPackages+=" zlib_devel"

# ML.NET dependencies
__UbuntuPackages+=" libomp5"
__UbuntuPackages+=" libomp-dev"

# Taken from https://github.com/alpinelinux/alpine-chroot-install/blob/6d08f12a8a70dd9b9dc7d997c88aa7789cc03c42/alpine-chroot-install#L85-L133
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616db30d:MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAnpUpyWDWjlUk3smlWeA0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\n8CM1S15HxV78s9dFntEqIokCAwEAAQ==
'
__Keyring=
__SkipSigCheck=0
__UseMirror=0

__UnprocessedBuildArgs=
while :; do
    if [[ "$#" -le 0 ]]; then
        break
    fi

    lowerI="$(echo "$1" | tr "[:upper:]" "[:lower:]")"
    case $lowerI in
        -\?|-h|--help)
            usage
            ;;
        arm)
            __BuildArch=arm
            __UbuntuArch=armhf
            __AlpineArch=armv7
            __QEMUArch=arm
            ;;
        arm64)
            __BuildArch=arm64
            __UbuntuArch=arm64
            __AlpineArch=aarch64
            __QEMUArch=aarch64
            __FreeBSDArch=arm64
            __FreeBSDMachineArch=aarch64
            ;;
        armel)
            __BuildArch=armel
            __UbuntuArch=armel
            __UbuntuRepo="http://ftp.debian.org/debian/"
            __CodeName=jessie
            ;;
        armv6)
            __BuildArch=armv6
            __UbuntuArch=armhf
            __QEMUArch=arm
            __UbuntuRepo="http://raspbian.raspberrypi.org/raspbian/"
            __CodeName=buster
            __LLDB_Package="liblldb-6.0-dev"

            if [[ -e "/usr/share/keyrings/raspbian-archive-keyring.gpg" ]]; then
                __Keyring="--keyring /usr/share/keyrings/raspbian-archive-keyring.gpg"
            fi
            ;;
        riscv64)
            __BuildArch=riscv64
            __AlpineArch=riscv64
            __AlpinePackages="${__AlpinePackages// lldb-dev/}"
            __QEMUArch=riscv64
            __UbuntuArch=riscv64
            __UbuntuRepo="http://deb.debian.org/debian"
            __UbuntuPackages="${__UbuntuPackages// libunwind8-dev/}"
            unset __LLDB_Package

            if [[ -e "/usr/share/keyrings/debian-archive-keyring.gpg" ]]; then
                __Keyring="--keyring /usr/share/keyrings/debian-archive-keyring.gpg --include=debian-archive-keyring"
            fi
            ;;
        ppc64le)
            __BuildArch=ppc64le
            __AlpineArch=ppc64le
            __QEMUArch=ppc64le
            __UbuntuArch=ppc64el
            __UbuntuRepo="http://ports.ubuntu.com/ubuntu-ports/"
            __UbuntuPackages="${__UbuntuPackages// libunwind8-dev/}"
            __UbuntuPackages="${__UbuntuPackages// libomp-dev/}"
            __UbuntuPackages="${__UbuntuPackages// libomp5/}"
            unset __LLDB_Package
            ;;
        s390x)
            __BuildArch=s390x
            __AlpineArch=s390x
            __QEMUArch=s390x
            __UbuntuArch=s390x
            __UbuntuRepo="http://ports.ubuntu.com/ubuntu-ports/"
            __UbuntuPackages="${__UbuntuPackages// libunwind8-dev/}"
            __UbuntuPackages="${__UbuntuPackages// libomp-dev/}"
            __UbuntuPackages="${__UbuntuPackages// libomp5/}"
            unset __LLDB_Package
            ;;
        x64)
            __BuildArch=x64
            __AlpineArch=x86_64
            __UbuntuArch=amd64
            __FreeBSDArch=amd64
            __FreeBSDMachineArch=amd64
            __illumosArch=x86_64
            __HaikuArch=x86_64
            __UbuntuRepo="http://archive.ubuntu.com/ubuntu/"
            ;;
        x86)
            __BuildArch=x86
            __UbuntuArch=i386
            __AlpineArch=x86
            __UbuntuRepo="http://archive.ubuntu.com/ubuntu/"
            ;;
        lldb*)
            version="$(echo "$lowerI" | tr -d '[:alpha:]-=')"
            majorVersion="${version%%.*}"

            [ -z "${version##*.*}" ] && minorVersion="${version#*.}"
            if [ -z "$minorVersion" ]; then
                minorVersion=0
            fi

            # for versions > 6.0, lldb has dropped the minor version
            if [ "$majorVersion" -le 6 ]; then
                version="$majorVersion.$minorVersion"
            else
                version="$majorVersion"
            fi

            __LLDB_Package="liblldb-${version}-dev"
            ;;
        no-lldb)
            unset __LLDB_Package
            ;;
        llvm*)
            version="$(echo "$lowerI" | tr -d '[:alpha:]-=')"
            __LLVM_MajorVersion="${version%%.*}"

            [ -z "${version##*.*}" ] && __LLVM_MinorVersion="${version#*.}"
            if [ -z "$__LLVM_MinorVersion" ]; then
                __LLVM_MinorVersion=0
            fi

            # for versions > 6.0, lldb has dropped the minor version
            if [ "$__LLVM_MajorVersion" -gt 6 ]; then
                __LLVM_MinorVersion=
            fi

            ;;
        xenial) # Ubuntu 16.04
            if [[ "$__CodeName" != "jessie" ]]; then
                __CodeName=xenial
            fi
            ;;
        zesty) # Ubuntu 17.04
            if [[ "$__CodeName" != "jessie" ]]; then
                __CodeName=zesty
            fi
            ;;
        bionic) # Ubuntu 18.04
            if [[ "$__CodeName" != "jessie" ]]; then
                __CodeName=bionic
            fi
            ;;
        focal) # Ubuntu 20.04
            if [[ "$__CodeName" != "jessie" ]]; then
                __CodeName=focal
            fi
            ;;
        jammy) # Ubuntu 22.04
            if [[ "$__CodeName" != "jessie" ]]; then
                __CodeName=jammy
            fi
            ;;
        jessie) # Debian 8
            __CodeName=jessie

            if [[ -z "$__UbuntuRepo" ]]; then
                __UbuntuRepo="http://ftp.debian.org/debian/"
            fi
            ;;
        stretch) # Debian 9
            __CodeName=stretch
            __LLDB_Package="liblldb-6.0-dev"

            if [[ -z "$__UbuntuRepo" ]]; then
                __UbuntuRepo="http://ftp.debian.org/debian/"
            fi
            ;;
        buster) # Debian 10
            __CodeName=buster
            __LLDB_Package="liblldb-6.0-dev"

            if [[ -z "$__UbuntuRepo" ]]; then
                __UbuntuRepo="http://ftp.debian.org/debian/"
            fi
            ;;
        bullseye) # Debian 11
            __CodeName=bullseye

            if [[ -z "$__UbuntuRepo" ]]; then
                __UbuntuRepo="http://ftp.debian.org/debian/"
            fi
            ;;
        sid) # Debian sid
            __CodeName=sid

            if [[ -z "$__UbuntuRepo" ]]; then
                __UbuntuRepo="http://ftp.debian.org/debian/"
            fi
            ;;
        tizen)
            __CodeName=
            __UbuntuRepo=
            __Tizen=tizen
            ;;
        alpine*)
            __CodeName=alpine
            __UbuntuRepo=

            if [[ "$lowerI" == "alpineedge" ]]; then
                __AlpineVersion=edge
            else
                version="$(echo "$lowerI" | tr -d '[:alpha:]-=')"
                __AlpineMajorVersion="${version%%.*}"
                __AlpineMinorVersion="${version#*.}"
                __AlpineVersion="$__AlpineMajorVersion.$__AlpineMinorVersion"
            fi
            ;;
        freebsd13)
            __CodeName=freebsd
            __SkipUnmount=1
            ;;
        freebsd14)
            __CodeName=freebsd
            __FreeBSDBase="14.0-RELEASE"
            __FreeBSDABI="14"
            __SkipUnmount=1
            ;;
        illumos)
            __CodeName=illumos
            __SkipUnmount=1
            ;;
        haiku)
            __CodeName=haiku
            __SkipUnmount=1
            ;;
        --skipunmount)
            __SkipUnmount=1
            ;;
        --skipsigcheck)
            __SkipSigCheck=1
            ;;
        --rootfsdir|-rootfsdir)
            shift
            __RootfsDir="$1"
            ;;
        --use-mirror)
            __UseMirror=1
            ;;
        --use-jobs)
            shift
            MAXJOBS=$1
            ;;
        *)
            __UnprocessedBuildArgs="$__UnprocessedBuildArgs $1"
            ;;
    esac

    shift
done

case "$__AlpineVersion" in
    3.14) __AlpinePackages+=" llvm11-libs" ;;
    3.15) __AlpinePackages+=" llvm12-libs" ;;
    3.16) __AlpinePackages+=" llvm13-libs" ;;
    3.17) __AlpinePackages+=" llvm15-libs" ;;
    edge) __AlpineLlvmLibsLookup=1 ;;
    *)
        if [[ "$__AlpineArch" =~ s390x|ppc64le ]]; then
            __AlpineVersion=3.15 # minimum version that supports lldb-dev
            __AlpinePackages+=" llvm12-libs"
        elif [[ "$__AlpineArch" == "x86" ]]; then
            __AlpineVersion=3.17 # minimum version that supports lldb-dev
            __AlpinePackages+=" llvm15-libs"
        elif [[ "$__AlpineArch" == "riscv64" ]]; then
            __AlpineLlvmLibsLookup=1
            __AlpineVersion=edge # minimum version with APKINDEX.tar.gz (packages archive)
        else
            __AlpineVersion=3.13 # 3.13 to maximize compatibility
            __AlpinePackages+=" llvm10-libs"

            if [[ "$__AlpineArch" == "armv7" ]]; then
                __AlpinePackages="${__AlpinePackages//numactl-dev/}"
            fi
        fi
esac

if [[ "$__AlpineVersion" =~ 3\.1[345] ]]; then
    # compiler-rt--static was merged in compiler-rt package in alpine 3.16
    # for older versions, we need compiler-rt--static, so replace the name
    __AlpinePackages="${__AlpinePackages/compiler-rt/compiler-rt-static}"
fi

if [[ "$__BuildArch" == "armel" ]]; then
    __LLDB_Package="lldb-3.5-dev"
fi

if [[ "$__CodeName" == "xenial" && "$__UbuntuArch" == "armhf" ]]; then
    # libnuma-dev is not available on armhf for xenial
    __UbuntuPackages="${__UbuntuPackages//libnuma-dev/}"
fi

__UbuntuPackages+=" ${__LLDB_Package:-}"

if [[ -n "$__LLVM_MajorVersion" ]]; then
    __UbuntuPackages+=" libclang-common-${__LLVM_MajorVersion}${__LLVM_MinorVersion:+.$__LLVM_MinorVersion}-dev"
fi

if [[ -z "$__RootfsDir" && -n "$ROOTFS_DIR" ]]; then
    __RootfsDir="$ROOTFS_DIR"
fi

if [[ -z "$__RootfsDir" ]]; then
    __RootfsDir="$__CrossDir/../../../.tools/rootfs/$__BuildArch"
fi

if [[ -d "$__RootfsDir" ]]; then
    if [[ "$__SkipUnmount" == "0" ]]; then
        umount "$__RootfsDir"/* || true
    fi
    rm -rf "$__RootfsDir"
fi

mkdir -p "$__RootfsDir"
__RootfsDir="$( cd "$__RootfsDir" && pwd )"

if [[ "$__CodeName" == "alpine" ]]; then
    __ApkToolsVersion=2.12.11
    __ApkToolsDir="$(mktemp -d)"
    __ApkKeysDir="$(mktemp -d)"

    arch="$(uname -m)"
    wget "https://gitlab.alpinelinux.org/api/v4/projects/5/packages/generic/v$__ApkToolsVersion/$arch/apk.static" -P "$__ApkToolsDir"
    if [[ "$arch" == "x86_64" ]]; then
      __ApkToolsSHA512SUM="53e57b49230da07ef44ee0765b9592580308c407a8d4da7125550957bb72cb59638e04f8892a18b584451c8d841d1c7cb0f0ab680cc323a3015776affaa3be33"
    elif [[ "$arch" == "aarch64" ]]; then
      __ApkToolsSHA512SUM="9e2b37ecb2b56c05dad23d379be84fd494c14bd730b620d0d576bda760588e1f2f59a7fcb2f2080577e0085f23a0ca8eadd993b4e61c2ab29549fdb71969afd0"
    else
      echo "WARNING: add missing hash for your host architecture. To find the value, use: 'find /tmp -name apk.static -exec sha512sum {} \;'"
    fi
    echo "$__ApkToolsSHA512SUM $__ApkToolsDir/apk.static" | sha512sum -c
    chmod +x "$__ApkToolsDir/apk.static"

    if [[ -f "/usr/bin/qemu-$__QEMUArch-static" ]]; then
        mkdir -p "$__RootfsDir"/usr/bin
        cp -v "/usr/bin/qemu-$__QEMUArch-static" "$__RootfsDir/usr/bin"
    fi

    if [[ "$__AlpineVersion" == "edge" ]]; then
        version=edge
    else
        version="v$__AlpineVersion"
    fi

    for line in $__AlpineKeys; do
        id="${line%%:*}"
        content="${line#*:}"

        echo -e "-----BEGIN PUBLIC KEY-----\n$content\n-----END PUBLIC KEY-----" > "$__ApkKeysDir/alpine-devel@lists.alpinelinux.org-$id.rsa.pub"
    done

    if [[ "$__SkipSigCheck" == "1" ]]; then
        __ApkSignatureArg="--allow-untrusted"
    else
        __ApkSignatureArg="--keys-dir $__ApkKeysDir"
    fi

    # initialize DB
    # shellcheck disable=SC2086
    "$__ApkToolsDir/apk.static" \
        -X "http://dl-cdn.alpinelinux.org/alpine/$version/main" \
        -X "http://dl-cdn.alpinelinux.org/alpine/$version/community" \
        -U $__ApkSignatureArg --root "$__RootfsDir" --arch "$__AlpineArch" --initdb add

    if [[ "$__AlpineLlvmLibsLookup" == 1 ]]; then
        # shellcheck disable=SC2086
        __AlpinePackages+=" $("$__ApkToolsDir/apk.static" \
            -X "http://dl-cdn.alpinelinux.org/alpine/$version/main" \
            -X "http://dl-cdn.alpinelinux.org/alpine/$version/community" \
            -U $__ApkSignatureArg --root "$__RootfsDir" --arch "$__AlpineArch" \
            search 'llvm*-libs' | grep -E '^llvm' | sort | tail -1 | sed 's/-[^-]*//2g')"
    fi

    # install all packages in one go
    # shellcheck disable=SC2086
    "$__ApkToolsDir/apk.static" \
        -X "http://dl-cdn.alpinelinux.org/alpine/$version/main" \
        -X "http://dl-cdn.alpinelinux.org/alpine/$version/community" \
        -U $__ApkSignatureArg --root "$__RootfsDir" --arch "$__AlpineArch" \
        add $__AlpinePackages

    rm -r "$__ApkToolsDir"
elif [[ "$__CodeName" == "freebsd" ]]; then
    mkdir -p "$__RootfsDir"/usr/local/etc
    JOBS=${MAXJOBS:="$(getconf _NPROCESSORS_ONLN)"}
    wget -O - "https://download.freebsd.org/ftp/releases/${__FreeBSDArch}/${__FreeBSDMachineArch}/${__FreeBSDBase}/base.txz" | tar -C "$__RootfsDir" -Jxf - ./lib ./usr/lib ./usr/libdata ./usr/include ./usr/share/keys ./etc ./bin/freebsd-version
    echo "ABI = \"FreeBSD:${__FreeBSDABI}:${__FreeBSDMachineArch}\"; FINGERPRINTS = \"${__RootfsDir}/usr/share/keys\"; REPOS_DIR = [\"${__RootfsDir}/etc/pkg\"]; REPO_AUTOUPDATE = NO; RUN_SCRIPTS = NO;" > "${__RootfsDir}"/usr/local/etc/pkg.conf
    echo "FreeBSD: { url: \"pkg+http://pkg.FreeBSD.org/\${ABI}/quarterly\", mirror_type: \"srv\", signature_type: \"fingerprints\", fingerprints: \"${__RootfsDir}/usr/share/keys/pkg\", enabled: yes }" > "${__RootfsDir}"/etc/pkg/FreeBSD.conf
    mkdir -p "$__RootfsDir"/tmp
    # get and build package manager
    wget -O - "https://github.com/freebsd/pkg/archive/${__FreeBSDPkg}.tar.gz" | tar -C "$__RootfsDir"/tmp -zxf -
    cd "$__RootfsDir/tmp/pkg-${__FreeBSDPkg}"
    # needed for install to succeed
    mkdir -p "$__RootfsDir"/host/etc
    ./autogen.sh && ./configure --prefix="$__RootfsDir"/host && make -j "$JOBS" && make install
    rm -rf "$__RootfsDir/tmp/pkg-${__FreeBSDPkg}"
    # install packages we need.
    INSTALL_AS_USER=$(whoami) "$__RootfsDir"/host/sbin/pkg -r "$__RootfsDir" -C "$__RootfsDir"/usr/local/etc/pkg.conf update
    # shellcheck disable=SC2086
    INSTALL_AS_USER=$(whoami) "$__RootfsDir"/host/sbin/pkg -r "$__RootfsDir" -C "$__RootfsDir"/usr/local/etc/pkg.conf install --yes $__FreeBSDPackages
elif [[ "$__CodeName" == "illumos" ]]; then
    mkdir "$__RootfsDir/tmp"
    pushd "$__RootfsDir/tmp"
    JOBS=${MAXJOBS:="$(getconf _NPROCESSORS_ONLN)"}
    echo "Downloading sysroot."
    wget -O - https://github.com/illumos/sysroot/releases/download/20181213-de6af22ae73b-v1/illumos-sysroot-i386-20181213-de6af22ae73b-v1.tar.gz | tar -C "$__RootfsDir" -xzf -
    echo "Building binutils. Please wait.."
    wget -O - https://ftp.gnu.org/gnu/binutils/binutils-2.33.1.tar.bz2 | tar -xjf -
    mkdir build-binutils && cd build-binutils
    ../binutils-2.33.1/configure --prefix="$__RootfsDir" --target="${__illumosArch}-sun-solaris2.10" --program-prefix="${__illumosArch}-illumos-" --with-sysroot="$__RootfsDir"
    make -j "$JOBS" && make install && cd ..
    echo "Building gcc. Please wait.."
    wget -O - https://ftp.gnu.org/gnu/gcc/gcc-8.4.0/gcc-8.4.0.tar.xz | tar -xJf -
    CFLAGS="-fPIC"
    CXXFLAGS="-fPIC"
    CXXFLAGS_FOR_TARGET="-fPIC"
    CFLAGS_FOR_TARGET="-fPIC"
    export CFLAGS CXXFLAGS CXXFLAGS_FOR_TARGET CFLAGS_FOR_TARGET
    mkdir build-gcc && cd build-gcc
    ../gcc-8.4.0/configure --prefix="$__RootfsDir" --target="${__illumosArch}-sun-solaris2.10" --program-prefix="${__illumosArch}-illumos-" --with-sysroot="$__RootfsDir" --with-gnu-as       \
        --with-gnu-ld --disable-nls --disable-libgomp --disable-libquadmath --disable-libssp --disable-libvtv --disable-libcilkrts --disable-libada --disable-libsanitizer \
        --disable-libquadmath-support --disable-shared --enable-tls
    make -j "$JOBS" && make install && cd ..
    BaseUrl=https://pkgsrc.smartos.org
    if [[ "$__UseMirror" == 1 ]]; then
        BaseUrl=https://pkgsrc.smartos.skylime.net
    fi
    BaseUrl="$BaseUrl/packages/SmartOS/trunk/${__illumosArch}/All"
    echo "Downloading manifest"
    wget "$BaseUrl"
    echo "Downloading dependencies."
    read -ra array <<<"$__IllumosPackages"
    for package in "${array[@]}"; do
        echo "Installing '$package'"
        # find last occurrence of package in listing and extract its name
        package="$(sed -En '/.*href="('"$package"'-[0-9].*).tgz".*/h;$!d;g;s//\1/p' All)"
        echo "Resolved name '$package'"
        wget "$BaseUrl"/"$package".tgz
        ar -x "$package".tgz
        tar --skip-old-files -xzf "$package".tmp.tg* -C "$__RootfsDir" 2>/dev/null
    done
    echo "Cleaning up temporary files."
    popd
    rm -rf "$__RootfsDir"/{tmp,+*}
    mkdir -p "$__RootfsDir"/usr/include/net
    mkdir -p "$__RootfsDir"/usr/include/netpacket
    wget -P "$__RootfsDir"/usr/include/net https://raw.githubusercontent.com/illumos/illumos-gate/master/usr/src/uts/common/io/bpf/net/bpf.h
    wget -P "$__RootfsDir"/usr/include/net https://raw.githubusercontent.com/illumos/illumos-gate/master/usr/src/uts/common/io/bpf/net/dlt.h
    wget -P "$__RootfsDir"/usr/include/netpacket https://raw.githubusercontent.com/illumos/illumos-gate/master/usr/src/uts/common/inet/sockmods/netpacket/packet.h
    wget -P "$__RootfsDir"/usr/include/sys https://raw.githubusercontent.com/illumos/illumos-gate/master/usr/src/uts/common/sys/sdt.h
elif [[ "$__CodeName" == "haiku" ]]; then
    JOBS=${MAXJOBS:="$(getconf _NPROCESSORS_ONLN)"}

    echo "Building Haiku sysroot for $__HaikuArch"
    mkdir -p "$__RootfsDir/tmp"
    pushd "$__RootfsDir/tmp"

    mkdir "$__RootfsDir/tmp/download"

    echo "Downloading Haiku package tool"
    git clone https://github.com/haiku/haiku-toolchains-ubuntu --depth 1 "$__RootfsDir/tmp/script"
    wget -O "$__RootfsDir/tmp/download/hosttools.zip" "$("$__RootfsDir/tmp/script/fetch.sh" --hosttools)"
    unzip -o "$__RootfsDir/tmp/download/hosttools.zip" -d "$__RootfsDir/tmp/bin"

    DepotBaseUrl="https://depot.haiku-os.org/__api/v2/pkg/get-pkg"
    HpkgBaseUrl="https://eu.hpkg.haiku-os.org/haiku/master/$__HaikuArch/current"

    # Download Haiku packages
    echo "Downloading Haiku packages"
    read -ra array <<<"$__HaikuPackages"
    for package in "${array[@]}"; do
        echo "Downloading $package..."
        # API documented here: https://github.com/haiku/haikudepotserver/blob/master/haikudepotserver-api2/src/main/resources/api2/pkg.yaml#L60
        # The schema here: https://github.com/haiku/haikudepotserver/blob/master/haikudepotserver-api2/src/main/resources/api2/pkg.yaml#L598
        hpkgDownloadUrl="$(wget -qO- --post-data='{"name":"'"$package"'","repositorySourceCode":"haikuports_'$__HaikuArch'","versionType":"LATEST","naturalLanguageCode":"en"}' \
            --header='Content-Type:application/json' "$DepotBaseUrl" | jq -r '.result.versions[].hpkgDownloadURL')"
        wget -P "$__RootfsDir/tmp/download" "$hpkgDownloadUrl"
    done
    for package in haiku haiku_devel; do
        echo "Downloading $package..."
        hpkgVersion="$(wget -qO- $HpkgBaseUrl | sed -n 's/^.*version: "\([^"]*\)".*$/\1/p')"
        wget -P "$__RootfsDir/tmp/download" "$HpkgBaseUrl/packages/$package-$hpkgVersion-1-$__HaikuArch.hpkg"
    done

    # Set up the sysroot
    echo "Setting up sysroot and extracting required packages"
    mkdir -p "$__RootfsDir/boot/system"
    for file in "$__RootfsDir/tmp/download/"*.hpkg; do
        echo "Extracting $file..."
        LD_LIBRARY_PATH="$__RootfsDir/tmp/bin" "$__RootfsDir/tmp/bin/package" extract -C "$__RootfsDir/boot/system" "$file"
    done

    # Download buildtools
    echo "Downloading Haiku buildtools"
    wget -O "$__RootfsDir/tmp/download/buildtools.zip" "$("$__RootfsDir/tmp/script/fetch.sh" --buildtools --arch=$__HaikuArch)"
    unzip -o "$__RootfsDir/tmp/download/buildtools.zip" -d "$__RootfsDir"

    # Cleaning up temporary files
    echo "Cleaning up temporary files"
    popd
    rm -rf "$__RootfsDir/tmp"
elif [[ -n "$__CodeName" ]]; then

    if [[ "$__SkipSigCheck" == "0" ]]; then
        __Keyring="$__Keyring --force-check-gpg"
    fi

    # shellcheck disable=SC2086
    debootstrap "--variant=minbase" $__Keyring --arch "$__UbuntuArch" "$__CodeName" "$__RootfsDir" "$__UbuntuRepo"
    cp "$__CrossDir/$__BuildArch/sources.list.$__CodeName" "$__RootfsDir/etc/apt/sources.list"
    chroot "$__RootfsDir" apt-get update
    chroot "$__RootfsDir" apt-get -f -y install
    # shellcheck disable=SC2086
    chroot "$__RootfsDir" apt-get -y install $__UbuntuPackages
    chroot "$__RootfsDir" symlinks -cr /usr
    chroot "$__RootfsDir" apt-get clean

    if [[ "$__SkipUnmount" == "0" ]]; then
        umount "$__RootfsDir"/* || true
    fi

    if [[ "$__BuildArch" == "armel" && "$__CodeName" == "jessie" ]]; then
        pushd "$__RootfsDir"
        patch -p1 < "$__CrossDir/$__BuildArch/armel.jessie.patch"
        popd
    fi
elif [[ "$__Tizen" == "tizen" ]]; then
    ROOTFS_DIR="$__RootfsDir" "$__CrossDir/tizen-build-rootfs.sh" "$__BuildArch"
else
    echo "Unsupported target platform."
    usage
fi