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#!/bin/bash
# SPDX-License-Identifier: LGPL-2.1-or-later
set -e

# This is a build script for OS image generation using mkosi (https://github.com/systemd/mkosi).
# Simply invoke "mkosi" in the project directory to build an OS image.

# If mkosi.builddir/ exists mkosi will set $BUILDDIR to it, let's then use it
# as out-of-tree build dir. Otherwise, let's make up our own builddir.
[ -z "$BUILDDIR" ] && BUILDDIR="$PWD"/build

# Let's make sure we're using stuff from the build directory first if available there.
PATH="$BUILDDIR:$PATH"
export PATH

# The bpftool script shipped by Ubuntu tries to find the actual program to run via querying `uname -r` and
# using the current kernel version. This obviously doesn't work in containers. As a workaround, we override
# the ubuntu script with a symlink to the first bpftool program we can find.
for bpftool in /usr/lib/linux-tools/*/bpftool; do
    [ -x "$bpftool" ] || continue
    ln -sf "$bpftool" "$BUILDDIR"/bpftool
    break
done

# CentOS Stream 8 includes bpftool 4.18.0 which is lower than what we need. However, they've backported the
# specific feature we need ("gen skeleton") to this version, so we replace bpftool with a script that reports
# version 5.6.0 to satisfy meson which makes bpf work on CentOS Stream 8 as well.
if [ "$(grep '^ID=' /etc/os-release)" = "ID=\"centos\"" ] && [ "$(grep '^VERSION=' /etc/os-release)" = "VERSION=\"8\"" ]; then
    cat >"$BUILDDIR"/bpftool <<EOF
#!/bin/sh
if [ "\$1" = --version ]; then
    echo 5.6.0
else
    exec /usr/sbin/bpftool \$@
fi
EOF
    chmod +x "$BUILDDIR"/bpftool
fi

if [ ! -f "$BUILDDIR"/build.ninja ]; then
    sysvinit_path=$(realpath /etc/init.d)

    init_path=$(realpath /sbin/init 2>/dev/null)
    if [ -z "$init_path" ]; then
        rootprefix=""
    else
        rootprefix=${init_path%/lib/systemd/systemd}
        rootprefix=/${rootprefix#/}
    fi

    CONFIGURE_OPTS=(
        -D sysvinit-path="$sysvinit_path"
        -D rootprefix="$rootprefix"
        -D default-timeout-sec="${DEFAULT_TIMEOUT_SEC:-10}"
        -D default-user-timeout-sec="${DEFAULT_TIMEOUT_SEC:-10}"
        -D man=false
        -D translations=false
        -D version-tag="${VERSION_TAG}"
        -D mode=developer
        -D b_sanitize="${SANITIZERS:-none}"
        -D install-tests=true
        -D tests=unsafe
        -D slow-tests="${SLOW_TESTS:-false}"
        -D create-log-dirs=false
        -D pamconfdir=no
        -D utmp=true
        -D hibernate=true
        -D ldconfig=true
        -D resolve=true
        -D efi=true
        -D tpm=true
        -D environment-d=true
        -D binfmt=true
        -D repart=true
        -D sysupdate=true
        -D coredump=true
        -D pstore=true
        -D oomd=true
        -D logind=true
        -D hostnamed=true
        -D localed=true
        -D machined=true
        -D portabled=true
        -D sysext=true
        -D userdb=true
        -D homed=true
        -D networkd=true
        -D timedated=true
        -D timesyncd=true
        -D remote=true
        -D nss-myhostname=true
        -D nss-mymachines=true
        -D nss-resolve=true
        -D nss-systemd=true
        -D firstboot=true
        -D randomseed=true
        -D backlight=true
        -D vconsole=true
        -D quotacheck=true
        -D sysusers=true
        -D tmpfiles=true
        -D importd=true
        -D hwdb=true
        -D rfkill=true
        -D xdg-autostart=true
        -D translations=true
        -D polkit=true
        -D acl=true
        -D audit=true
        -D blkid=true
        -D fdisk=true
        -D kmod=true
        -D pam=true
        -D pwquality=true
        -D microhttpd=true
        -D libcryptsetup=true
        -D libcurl=true
        -D idn=true
        -D libidn2=true
        -D qrencode=true
        -D gcrypt=true
        -D gnutls=true
        -D openssl=true
        -D cryptolib=openssl
        -D p11kit=true
        -D libfido2=true
        -D tpm2=true
        -D elfutils=true
        -D zstd=true
        -D xkbcommon=true
        -D pcre2=true
        -D glib=true
        -D dbus=true
        -D bootloader=true
        -D kernel-install=true
        -D analyze=true
        -D bpf-framework=true
        -D ukify=true
    )

    # On debian-like systems the library directory is not /usr/lib64 but /usr/lib/<arch-triplet>/.
    # It is important to use the right one especially for cryptsetup plugins, otherwise they will be
    # installed in the wrong directory and not be found by cryptsetup. Assume native build.
    if grep -q -e "ID=debian" -e "ID_LIKE=debian" /etc/os-release && command -v dpkg 2>/dev/null; then
        CONFIGURE_OPTS+=(
            -D rootlibdir="/usr/lib/$(dpkg-architecture -qDEB_HOST_MULTIARCH)"
            -D pamlibdir="/usr/lib/$(dpkg-architecture -qDEB_HOST_MULTIARCH)/security"
        )
    fi

    # Set various uids and gids for which Fedora has "soft static" allocations.
    # Without this, we would get warning about mismatched sysusers.d entries
    # between the files that we and Fedora's setup package install.
    if grep -q '^ID=fedora' /etc/os-release; then
        CONFIGURE_OPTS+=(
            -Dadm-gid=4
            -Daudio-gid=63
            -Dcdrom-gid=11
            -Ddialout-gid=18
            -Ddisk-gid=6
            -Dinput-gid=104
            -Dkmem-gid=9
            -Dkvm-gid=36
            -Dlp-gid=7
            -Drender-gid=105
            -Dsgx-gid=106
            -Dtape-gid=33
            -Dtty-gid=5
            -Dusers-gid=100
            -Dutmp-gid=22
            -Dvideo-gid=39
            -Dwheel-gid=10
            -Dsystemd-journal-gid=190
            -Dsystemd-network-uid=192
            -Dsystemd-resolve-uid=193
        )
    fi

    ( set -x; meson setup "$BUILDDIR" "${CONFIGURE_OPTS[@]}" )
fi

( set -x; ninja -C "$BUILDDIR" "$@" )
if [ "$WITH_TESTS" = 1 ]; then
    if [ -n "$SANITIZERS" ]; then
        export ASAN_OPTIONS="$MKOSI_ASAN_OPTIONS"
        export UBSAN_OPTIONS="$MKOSI_UBSAN_OPTIONS"
        TIMEOUT_MULTIPLIER=3
    else
        TIMEOUT_MULTIPLIER=1
    fi

    ( set -x; meson test -C "$BUILDDIR" --print-errorlogs --timeout-multiplier=$TIMEOUT_MULTIPLIER )
fi

( set -x; meson install -C "$BUILDDIR" --quiet --no-rebuild --only-changed )