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dkim=pass header.i=@siemens.com header.s=selector2 header.b=hDvKCnu+; arc=pass (i=1 spf=pass spfdomain=siemens.com dkim=pass dkdomain=siemens.com dmarc=pass fromdomain=siemens.com); spf=pass (google.com: domain of felix.moessbauer@siemens.com designates 2a01:111:f403:c200::3 as permitted sender) smtp.mailfrom=felix.moessbauer@siemens.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=siemens.com X-Original-From: Felix Moessbauer Reply-To: Felix Moessbauer Precedence: list Mailing-list: list isar-users@googlegroups.com; contact isar-users+owners@googlegroups.com List-ID: X-Spam-Checked-In-Group: isar-users@googlegroups.com X-Google-Group-Id: 914930254986 List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , X-Spam-Status: No, score=-4.9 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL, RCVD_IN_RP_CERTIFIED,RCVD_IN_RP_RNBL,RCVD_IN_RP_SAFE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on shymkent.ilbers.de X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= Currently isar requires passwordless sudo and an environment where mounting file systems is possible. This has proven problematic for security reasons, both when running in a privileged container or locally. To solve this, we implement fully rootless builds that rely on the unshare syscall which allows us to avoid sudo and instead operate in temporary kernel namespaces as a user that is just privileged within that namespace. This comes with some challenges regarding the handling of mounts (they are cleared when leaving the namespace), as well as cross namespace deployments (the outer user might not be able to access the inner data). For that, we rework the handling of mounts and artifact passing to make it compatible with both chroot modes (schroot and unshare). Signed-off-by: Felix Moessbauer --- Kconfig | 2 +- RECIPE-API-CHANGELOG.md | 25 ++++++ doc/user_manual.md | 2 + kas/isar.yaml | 2 +- meta/classes-global/base.bbclass | 90 ++++++++++++++++++- meta/classes-recipe/deb-dl-dir.bbclass | 9 +- meta/classes-recipe/dpkg-base.bbclass | 16 +++- meta/classes-recipe/dpkg.bbclass | 14 ++- .../image-locales-extension.bbclass | 9 +- .../image-tools-extension.bbclass | 82 +++++++++++++++++ meta/classes-recipe/rootfs.bbclass | 56 +++++++++--- meta/classes-recipe/sbuild.bbclass | 26 +++++- meta/classes-recipe/sdk.bbclass | 10 ++- meta/conf/bitbake.conf | 7 +- .../isar-mmdebstrap/isar-mmdebstrap.inc | 12 ++- .../sbuild-chroot/sbuild-chroot.inc | 24 ++++- 16 files changed, 350 insertions(+), 36 deletions(-) diff --git a/Kconfig b/Kconfig index 683c0da5..5ef2bfcb 100644 --- a/Kconfig +++ b/Kconfig @@ -14,7 +14,7 @@ config KAS_INCLUDE_MAIN config KAS_BUILD_SYSTEM string - default "isar" + default "isar-rootless" source "kas/machine/Kconfig" source "kas/distro/Kconfig" diff --git a/RECIPE-API-CHANGELOG.md b/RECIPE-API-CHANGELOG.md index 31c61789..59ea3110 100644 --- a/RECIPE-API-CHANGELOG.md +++ b/RECIPE-API-CHANGELOG.md @@ -990,3 +990,28 @@ rootless builds. For that, the deployment of images happens in two steps: Conversion commands need to follow this strategy as well, but can read the image (prior to conversion) from `${IMAGE_FILE_CHROOT}`. + +### Rootless isar execution + +Isar is able to run without the need for `sudo` in an environment that +allows unprivileged users to unshare the kernels `user namespace`. Further, +a sufficiently large set of sub ids needs to be configured in `/etc/subuid` / `etc/subgid`. +This range should be `> 65536`, but smaller ranges might work as well, depending on the +ids used in the rootfs. + +A simple check if rootless is supported can be done by running: + +```bash +mmdebstrap --unshare-helper /bin/echo "rootless supported" || echo "rootless not supported" +``` + +To enable rootless builds, set the bitbake variable `ISAR_ROOTLESS = "1"`. +This internally switches the chroot mode from `schroot` to `unshare`. + +When using kas, the `build_system` needs to be set to `isar-rootless`, but the final +interfaces still need to be clarified. Further, kas patches are needed (for details, +check the kas mailing list). + +Note, that the following features are not supported yet in rootless mode: + +- devshell diff --git a/doc/user_manual.md b/doc/user_manual.md index 7520854b..77a37e9b 100644 --- a/doc/user_manual.md +++ b/doc/user_manual.md @@ -74,6 +74,7 @@ Building `debian-trixie` requires host system >= bookworm. Install the following packages: ``` apt install \ + acl \ binfmt-support \ bubblewrap \ bzip2 \ @@ -88,6 +89,7 @@ apt install \ qemu-user-static \ reprepro \ sudo \ + uidmap \ unzip \ xz-utils \ git-buildpackage \ diff --git a/kas/isar.yaml b/kas/isar.yaml index 16ce8b42..3cfc4f96 100644 --- a/kas/isar.yaml +++ b/kas/isar.yaml @@ -4,7 +4,7 @@ header: version: 14 -build_system: isar +build_system: isar-rootless repos: isar: diff --git a/meta/classes-global/base.bbclass b/meta/classes-global/base.bbclass index 730fd0b4..3806542b 100644 --- a/meta/classes-global/base.bbclass +++ b/meta/classes-global/base.bbclass @@ -389,7 +389,28 @@ do_unpack[prefuncs] += "deprecation_checking" # shall be used outside of this class. def insert_isar_mounts(d, rootfs, mounts): + """ + In unshare mode, all mounts must be created after unsharing the + mount namespace. As needs to happen within the unshared session, + we implement it as a code generator. Note, that the random and urandom + mounts are needed for DDI images. + """ lines = [] + to_touch = ['/dev/null', '/dev/random', '/dev/urandom'] + to_mkdir = ['/dev/pts', '/dev/shm'] + if d.getVar('ISAR_CHROOT_MODE') == 'unshare': + lines.append('touch ' + ' '.join(['{}/{}'.format(rootfs, f) for f in to_touch])) + lines.append('mkdir -p ' + ' '.join(['{}/{}'.format(rootfs, f) for f in to_mkdir])) + lines.append('mount -o bind,private,mode=666 /dev/null {}/dev/null'.format(rootfs)) + lines.append('mount -t devpts -o noexec,nosuid,uid=5,mode=620,ptmxmode=666 none {}/dev/pts'.format(rootfs)) + lines.append('( cd {}/dev; ln -sf pts/ptmx . )'.format(rootfs)) + lines.append('mount -t tmpfs none {}/dev/shm'.format(rootfs)) + lines.append('mount -o bind /dev/random {}/dev/random'.format(rootfs)) + lines.append('mount -o bind /dev/urandom {}/dev/urandom'.format(rootfs)) + lines.append('mount -t proc none {}/proc'.format(rootfs)) + # we do not unshare the network namespace, so we cannot create a sysfs, hence bind-mount + lines.append('mount -o rbind /sys {}/sys'.format(rootfs)) + for m in mounts.split(): host, inner = m.split(':') if ':' in m else (m, m) inner_full = os.path.join(rootfs, inner[1:]) @@ -398,7 +419,18 @@ def insert_isar_mounts(d, rootfs, mounts): return '\n'.join(lines) def insert_isar_umounts(d, rootfs, mounts): + """ + In unshare mount we don't unmount the system mounts but just + remove the mountpoints. + """ lines = [] + to_unlink = ['/dev/null', '/dev/random', '/dev/urandom', '/dev/ptmx'] + to_rmdir = ['/dev/pts', '/dev/shm'] + if d.getVar('ISAR_CHROOT_MODE') == 'unshare': + lines.append('rm -f ' + ' '.join(['{}/{}'.format(rootfs, f) for f in to_unlink])) + for d in ['{}/{}'.format(rootfs, _d) for _d in to_rmdir]: + lines.append('[ -d {} ] && rmdir {}'.format(d, d)) + for m in mounts.split(): host, inner = m.split(':') if ':' in m else (m, m) mp = '{}/{}'.format(rootfs, inner) @@ -406,11 +438,52 @@ def insert_isar_umounts(d, rootfs, mounts): lines.append('[ -d {} ] && rmdir --ignore-fail-on-non-empty {}'.format(mp, mp)) return '\n'.join(lines) +def get_subid_range(idmap, d): + with open(idmap, 'r') as f: + entries = f.readlines() + for e in entries: + user, base, cnt = e.split(':') + if user == os.getuid() or user == os.getlogin(): + return int(base), int(cnt) + bb.error("No sub-id range specified in %s" % idmap) + def run_privileged_cmd(d): - cmd = 'sudo -E' + """ + In unshare mode we need to map the rootfs uid/gid range into the + subuid/subgid range of the parent namespace. As we usually only + get 65534 ids, we cannot map the whole range, as two ids are already + used by the calling environment (root and builder user). Hence, map + as much as we can but also map the highest id (nobody / nogroup) as + these are used within the rootfs. It would be easier to use + mmdebstrap --unshare-helper as command (which is also internally used + by sbuild), but this only maps linear ranges, hence it cannot map the + nobody / nogroup on the default subid range. By that, we have to avoid + the nobody / nogroup when building packages in this case. + """ + if d.getVar('ISAR_CHROOT_MODE') == 'unshare': + nobody_id = 65534 + uid_base, uid_cnt = get_subid_range('/etc/subuid', d) + uid_cnt -= 2 + nobody_subid = uid_base + uid_cnt + gid_base, gid_cnt = get_subid_range('/etc/subgid', d) + gid_cnt -= 2 + nogroup_subid = gid_base + gid_cnt + cmd = 'unshare --mount --mount-proc --user --pid' \ + ' --kill-child' \ + ' --setuid 0 --setgid 0 --fork' \ + f' --map-users 0:{uid_base}:{uid_cnt}' \ + f' --map-groups 0:{gid_base}:{gid_cnt}' + if uid_cnt < nobody_id: + cmd += f' --map-users {nobody_id}:{nobody_subid}:1' + if gid_cnt < nobody_id: + cmd += f' --map-groups {nobody_id}:{nogroup_subid}:1' + else: + cmd = 'sudo -E' bb.debug(1, "privileged cmd: %s" % cmd) return cmd +UNSHARE_SUBUID_BASE := "${@get_subid_range('/etc/subuid', d)[0] if d.getVar('ISAR_CHROOT_MODE') == 'unshare' else '0'}" +# store in variable to only compute once and make available to fetcher RUN_PRIVILEGED_CMD := "${@run_privileged_cmd(d)}" run_privileged() { @@ -422,13 +495,24 @@ run_privileged_heredoc() { } # create a directory that is suitable to be the -# parent of a rootfs +# parent of a rootfs. In unshare mode, we further need to +# give the inner user the right to create a directory there. +# This is needed, as the inner user needs to extract the +# rootfs tarball and owns the '.' dir. create_chroot_parent_dir() { mkdir -p "$@" + if [ "${ISAR_CHROOT_MODE}" = "unshare" ]; then + setfacl -m u:${UNSHARE_SUBUID_BASE}:rwX "$@" + fi } run_in_chroot() { rootfs="$1" shift - ${RUN_PRIVILEGED_CMD} chroot "$rootfs" "$@" + + rootfs=$rootfs run_privileged_heredoc <<'EORIC' "$@" + set -e + ${@insert_isar_mounts(d, '$rootfs', '')} + chroot "$rootfs" "$@" +EORIC } diff --git a/meta/classes-recipe/deb-dl-dir.bbclass b/meta/classes-recipe/deb-dl-dir.bbclass index 05a16585..dc83edad 100644 --- a/meta/classes-recipe/deb-dl-dir.bbclass +++ b/meta/classes-recipe/deb-dl-dir.bbclass @@ -121,8 +121,13 @@ deb_dl_dir_import() { # let our unprivileged user place downloaded packages in /var/cache/apt/archives/ run_privileged_heredoc << ' EOSUDO' - mkdir -p "${rootfs}"/var/cache/apt/archives/partial/ - chown -R ${uid}:${gid} "${rootfs}"/var/cache/apt/archives/ + if [ "${ISAR_CHROOT_MODE}" = "unshare" ]; then + mkdir -p "${rootfs}"/var/cache/apt/archives + chmod 777 "${rootfs}"/var/cache/apt/archives + else + mkdir -p "${rootfs}"/var/cache/apt/archives/partial/ + chown -R ${uid}:${gid} "${rootfs}"/var/cache/apt/archives/ + fi EOSUDO # nothing to copy if download directory does not exist just yet diff --git a/meta/classes-recipe/dpkg-base.bbclass b/meta/classes-recipe/dpkg-base.bbclass index b3f4caad..0b8c6fba 100644 --- a/meta/classes-recipe/dpkg-base.bbclass +++ b/meta/classes-recipe/dpkg-base.bbclass @@ -168,12 +168,24 @@ dpkg_schroot_create_configs() { EOSUDO } +dpkg_chroot_prepare() { + if [ "${ISAR_CHROOT_MODE}" = "schroot" ]; then + dpkg_schroot_create_configs + fi +} + +dpkg_chroot_finalize() { + if [ "${ISAR_CHROOT_MODE}" = "schroot" ]; then + schroot_delete_configs + fi +} + python do_dpkg_build() { - bb.build.exec_func('dpkg_schroot_create_configs', d) + bb.build.exec_func('dpkg_chroot_prepare', d) try: bb.build.exec_func("dpkg_runbuild", d) finally: - bb.build.exec_func('schroot_delete_configs', d) + bb.build.exec_func('dpkg_chroot_finalize', d) } do_dpkg_build[network] = "${TASK_USE_NETWORK_AND_SUDO}" diff --git a/meta/classes-recipe/dpkg.bbclass b/meta/classes-recipe/dpkg.bbclass index 8d7ff092..9fda58af 100644 --- a/meta/classes-recipe/dpkg.bbclass +++ b/meta/classes-recipe/dpkg.bbclass @@ -78,6 +78,7 @@ dpkg_runbuild() { distro="${HOST_BASE_DISTRO}-${BASE_DISTRO_CODENAME}" fi + create_chroot_parent_dir ${WORKDIR} deb_dl_dir_import "${WORKDIR}/rootfs" "${distro}" deb_dir="/var/cache/apt/archives" @@ -85,7 +86,10 @@ dpkg_runbuild() { ext_deb_dir="${ext_root}${deb_dir}" if [ ${USE_CCACHE} -eq 1 ]; then - schroot_configure_ccache + ${ISAR_CHROOT_MODE}_configure_ccache + fi + if [ "${ISAR_CHROOT_MODE}" = "unshare" ]; then + sbuild_add_unshare_mounts fi profiles="${@ isar_deb_build_profiles(d)}" @@ -110,12 +114,13 @@ dpkg_runbuild() { DSC_FILE=$(find ${WORKDIR} -maxdepth 1 -name "${DEBIAN_SOURCE}_*.dsc" -print) sbuild -A -n -c ${SBUILD_CHROOT} \ + --chroot-mode=${ISAR_CHROOT_MODE} \ --host=${PACKAGE_ARCH} --build=${BUILD_ARCH} ${profiles} \ --no-run-lintian --no-run-piuparts --no-run-autopkgtest --resolve-alternatives \ --bd-uninstallable-explainer=apt \ --no-apt-update --apt-distupgrade \ --chroot-setup-commands="echo \"Package: *\nPin: release n=${DEBDISTRONAME}\nPin-Priority: 1000\" > /etc/apt/preferences.d/isar-apt" \ - --chroot-setup-commands="echo \"APT::Get::allow-downgrades 1;\" > /etc/apt/apt.conf.d/50isar-apt" \ + --chroot-setup-commands="echo \"APT::Get::allow-downgrades 1;${@'\nAPT::Sandbox::User root;' if d.getVar('ISAR_CHROOT_MODE') == 'unshare' else ''}\" > /etc/apt/apt.conf.d/50isar-apt" \ --chroot-setup-commands="rm -f /var/log/dpkg.log" \ --chroot-setup-commands="mkdir -p ${deb_dir}" \ --chroot-setup-commands="find ${ext_deb_dir} -maxdepth 1 -name '*.deb' -exec ln -t ${deb_dir}/ -sf {} +" \ @@ -125,7 +130,10 @@ dpkg_runbuild() { --finished-build-commands="cp /var/log/dpkg.log ${ext_root}/dpkg_partial.log" \ --build-path="" --build-dir=${WORKDIR} --dist="${DEBDISTRONAME}" ${DSC_FILE} - sbuild_dpkg_log_export "${WORKDIR}/rootfs/dpkg_partial.log" + # TODO: unclear if needed under unshare + if [ "${ISAR_CHROOT_MODE}" = "schroot" ]; then + sbuild_dpkg_log_export "${WORKDIR}/rootfs/dpkg_partial.log" + fi deb_dl_dir_export "${WORKDIR}/rootfs" "${distro}" # Cleanup apt artifacts diff --git a/meta/classes-recipe/image-locales-extension.bbclass b/meta/classes-recipe/image-locales-extension.bbclass index c1e8c175..bdaa55fb 100644 --- a/meta/classes-recipe/image-locales-extension.bbclass +++ b/meta/classes-recipe/image-locales-extension.bbclass @@ -29,8 +29,12 @@ ROOTFS_INSTALL_COMMAND_BEFORE_EXPORT += "image_install_localepurge_download" image_install_localepurge_download[weight] = "40" image_install_localepurge_download[network] = "${TASK_USE_NETWORK_AND_SUDO}" image_install_localepurge_download() { - run_in_chroot '${ROOTFSDIR}' \ + run_privileged_heredoc <<'EOF' + set -e + ${@insert_isar_mounts(d, d.getVar('ROOTFSDIR'), d.getVar('ROOTFS_MOUNTS') if d.getVar('ISAR_CHROOT_MODE') == 'unshare' else '')} + chroot ${ROOTFSDIR} \ /usr/bin/apt-get ${ROOTFS_APT_ARGS} -oDebug::NoLocking=1 --download-only localepurge +EOF } ROOTFS_INSTALL_COMMAND += "image_install_localepurge_install" @@ -62,6 +66,9 @@ __EOF__ # Install configuration into image: run_privileged_heredoc <<'EOSUDO' set -e + + ${@insert_isar_mounts(d, d.getVar('ROOTFSDIR'), '')} + localepurge_state='i' if chroot '${ROOTFSDIR}' dpkg -s localepurge 2>/dev/null >&2 then diff --git a/meta/classes-recipe/image-tools-extension.bbclass b/meta/classes-recipe/image-tools-extension.bbclass index 2eac3619..bae5c31e 100644 --- a/meta/classes-recipe/image-tools-extension.bbclass +++ b/meta/classes-recipe/image-tools-extension.bbclass @@ -16,6 +16,9 @@ do_image_tools[depends] += " \ SCHROOT_MOUNTS = "${WORKDIR}:${PP_WORK} ${IMAGE_ROOTFS}:${PP_ROOTFS} ${DEPLOY_DIR_IMAGE}:${PP_DEPLOY}" SCHROOT_MOUNTS += "${REPO_ISAR_DIR}/${DISTRO}:/isar-apt" +# only used on unshare +ROOTFS_IMAGETOOLS ?= "${WORKDIR}/rootfs-imgtools-${BB_CURRENTTASK}" + imager_run() { IMAGE_STAGE_DIR=$(dirname $IMAGE_STAGE_HOST) create_chroot_parent_dir $IMAGE_STAGE_DIR @@ -114,3 +117,82 @@ generate_imager_sbom() { --timestamp $TIMESTAMP ${SBOM_DEBSBOM_EXTRA_ARGS} \ < ${WORKDIR}/imager.manifest } + +imager_run_unshare() { + exec 3<&0 + + # ignore everything before '--'. If the remaining list is empty, + # assume a here document is passed via stdin + while [ "$#" -gt 0 ]; do + case "$1" in + --) shift 1; break ;; + *) shift 1 ;; + esac + done + + if [ "$#" -eq 0 ]; then + set -- "$@" '/bin/bash' '-s' + fi + + local_install="${@(d.getVar("INSTALL_%s" % d.getVar("BB_CURRENTTASK")) or '').strip()}" + + create_chroot_parent_dir $(realpath -m "${ROOTFS_IMAGETOOLS}/..") + + run_privileged_heredoc <<'EOF' + set -e + mkdir -p ${ROOTFS_IMAGETOOLS} + tar -xf "${SBUILD_CHROOT}" -C "${ROOTFS_IMAGETOOLS}" + mkdir -p ${ROOTFS_IMAGETOOLS}/isar-apt + cp -rL /etc/resolv.conf "${ROOTFS_IMAGETOOLS}/etc" +EOF + + # setting up error handler + imager_cleanup() { + run_privileged rm -rf ${ROOTFS_IMAGETOOLS} + } + trap 'exit 1' INT HUP QUIT TERM ALRM USR1 + trap 'imager_cleanup' EXIT + + if [ -n "${local_install}" ]; then + echo "Installing imager deps: ${local_install}" + + distro="${BASE_DISTRO}-${BASE_DISTRO_CODENAME}" + if [ ${ISAR_CROSS_COMPILE} -eq 1 ]; then + distro="${HOST_BASE_DISTRO}-${BASE_DISTRO_CODENAME}" + fi + + E="${@ isar_export_proxies(d)}" + deb_dl_dir_import ${ROOTFS_IMAGETOOLS} ${distro} + ${SCRIPTSDIR}/lockrun.py -r -f "${REPO_ISAR_DIR}/isar.lock" -s <<'EOAPT' + local_install=$local_install ${@run_privileged_cmd(d)} /bin/bash -s <<'EOF' + set -e + ${@insert_isar_mounts(d, d.getVar('ROOTFS_IMAGETOOLS'), d.getVar('SCHROOT_MOUNTS'))} + chroot ${ROOTFS_IMAGETOOLS} apt-get update \ + -o Dir::Etc::SourceList='sources.list.d/isar-apt.list' \ + -o Dir::Etc::SourceParts='-' \ + -o APT::Get::List-Cleanup='0' + chroot ${ROOTFS_IMAGETOOLS} apt-get -o Debug::pkgProblemResolver=yes --no-install-recommends -y \ + --allow-unauthenticated --allow-downgrades --download-only install \ + $local_install +EOF +EOAPT + + deb_dl_dir_export ${ROOTFS_IMAGETOOLS} ${distro} + local_install=$local_install run_privileged_heredoc <<'EOF' + set -e + ${@insert_isar_mounts(d, d.getVar('ROOTFS_IMAGETOOLS'), d.getVar('SCHROOT_MOUNTS'))} + chroot ${ROOTFS_IMAGETOOLS} apt-get -o Debug::pkgProblemResolver=yes --no-install-recommends -y \ + --allow-unauthenticated --allow-downgrades install \ + $local_install +EOF + fi + + run_privileged_heredoc <<'EOF' "$@" + set -e + mkdir -p ${ROOTFS_IMAGETOOLS}/${SCRIPTSDIR} + ${@insert_isar_mounts(d, d.getVar('ROOTFS_IMAGETOOLS'), d.getVar('SCHROOT_MOUNTS'))} + chroot ${ROOTFS_IMAGETOOLS} "$@" <&3 +EOF + + run_privileged rm -rf ${ROOTFS_IMAGETOOLS} +} diff --git a/meta/classes-recipe/rootfs.bbclass b/meta/classes-recipe/rootfs.bbclass index 1cd492c6..7570942a 100644 --- a/meta/classes-recipe/rootfs.bbclass +++ b/meta/classes-recipe/rootfs.bbclass @@ -145,7 +145,12 @@ rootfs_cmd() { } rootfs_do_mounts[weight] = "3" -rootfs_do_mounts() { +python rootfs_do_mounts() { + if d.getVar('ISAR_CHROOT_MODE') == 'schroot': + bb.build.exec_func('rootfs_do_mounts_priv', d) +} + +rootfs_do_mounts_priv() { run_privileged_heredoc <<'EOSUDO' set -e mountpoint -q '${ROOTFSDIR}/dev' || \ @@ -168,7 +173,13 @@ rootfs_do_mounts() { EOSUDO } -rootfs_do_umounts() { +python rootfs_do_umounts() { + # unconditionally run the unmount code as this ignores missing + # mountpoints but also does the cleanup of the directories + bb.build.exec_func('rootfs_do_umounts_priv', d) +} + +rootfs_do_umounts_priv() { run_privileged_heredoc <<'EOSUDO' set -e @@ -215,7 +226,12 @@ ROOTFS_EXTRA_IMPORTED := "${@rootfs_extra_import(d)}" rootfs_prepare[weight] = "25" rootfs_prepare(){ - run_privileged tar -xf "${BOOTSTRAP_SRC}" -C "${ROOTFSDIR}" --exclude="./dev/console" + create_chroot_parent_dir $(realpath "${ROOTFSDIR}/..") + rm -rf ${ROOTFSDIR} + run_privileged_heredoc << 'EOF' + mkdir -p ${ROOTFSDIR} + tar -xf "${BOOTSTRAP_SRC}" -C "${ROOTFSDIR}" --exclude="./dev/console" +EOF # setup chroot run_privileged "${ROOTFSDIR}/chroot-setup.sh" "setup" "${ROOTFSDIR}" @@ -285,10 +301,14 @@ rootfs_install_pkgs_update[weight] = "5" rootfs_install_pkgs_update[isar-apt-lock] = "acquire-before" rootfs_install_pkgs_update[network] = "${TASK_USE_NETWORK_AND_SUDO}" rootfs_install_pkgs_update() { - run_in_chroot '${ROOTFSDIR}' /usr/bin/apt-get update \ - -o Dir::Etc::SourceList="sources.list.d/isar-apt.list" \ - -o Dir::Etc::SourceParts="-" \ - -o APT::Get::List-Cleanup="0" + run_privileged_heredoc <<'EOF' + set -e + ${@insert_isar_mounts(d, d.getVar('ROOTFSDIR'), d.getVar('ROOTFS_MOUNTS')) if d.getVar('ISAR_CHROOT_MODE') == 'unshare' else ''} + chroot '${ROOTFSDIR}' /usr/bin/apt-get update \ + -o Dir::Etc::SourceList="sources.list.d/isar-apt.list" \ + -o Dir::Etc::SourceParts="-" \ + -o APT::Get::List-Cleanup="0" +EOF } ROOTFS_INSTALL_COMMAND += "rootfs_install_resolvconf" @@ -316,9 +336,12 @@ rootfs_install_pkgs_download[isar-apt-lock] = "release-after" rootfs_install_pkgs_download[network] = "${TASK_USE_NETWORK}" rootfs_install_pkgs_download() { # download packages using apt in a non-privileged namespace - rootfs_cmd --bind "${ROOTFSDIR}/var/cache/apt/archives" /var/cache/apt/archives \ - ${ROOTFSDIR} \ - -- /usr/bin/apt-get ${ROOTFS_APT_ARGS} -oDebug::NoLocking=1 --download-only ${ROOTFS_PACKAGES} + run_privileged_heredoc <<'EOF' + set -e + ${@insert_isar_mounts(d, d.getVar('ROOTFSDIR'), d.getVar('ROOTFS_MOUNTS')) if d.getVar('ISAR_CHROOT_MODE') == 'unshare' else ''} + chroot ${ROOTFSDIR} \ + /usr/bin/apt-get ${ROOTFS_APT_ARGS} -oDebug::NoLocking=1 --download-only ${ROOTFS_PACKAGES} +EOF } ROOTFS_INSTALL_COMMAND_BEFORE_EXPORT ??= "" @@ -345,8 +368,12 @@ rootfs_install_pkgs_install[weight] = "8000" rootfs_install_pkgs_install[progress] = "custom:rootfs_progress.PkgsInstallProgressHandler" rootfs_install_pkgs_install[network] = "${TASK_USE_SUDO}" rootfs_install_pkgs_install() { - run_in_chroot "${ROOTFSDIR}" \ + run_privileged_heredoc <<'EOF' + set -e + ${@insert_isar_mounts(d, d.getVar('ROOTFSDIR'), d.getVar('ROOTFS_MOUNTS')) if d.getVar('ISAR_CHROOT_MODE') == 'unshare' else ''} + chroot "${ROOTFSDIR}" \ /usr/bin/apt-get ${ROOTFS_APT_ARGS} ${ROOTFS_PACKAGES} +EOF } ROOTFS_INSTALL_COMMAND += "rootfs_restore_initrd_tooling" @@ -636,7 +663,7 @@ rootfs_install_sstate_prepare() { # tar --one-file-system will cross bind-mounts to the same filesystem, # so we use some mount magic to prevent that mkdir -p ${WORKDIR}/mnt/rootfs - run_privileged_here <<'EOF' 3> rootfs.tar + run_privileged_heredoc <<'EOF' 3> rootfs.tar mount -o bind,private '${ROOTFSDIR}' '${WORKDIR}/mnt/rootfs' -o ro lopts="--one-file-system --exclude=var/cache/apt/archives" tar -C ${WORKDIR}/mnt/rootfs -cpS $lopts ${SSTATE_TAR_ATTR_FLAGS} . >&3 @@ -650,8 +677,11 @@ rootfs_install_sstate_finalize() { # - after building the rootfs, the tar won't be there, but we also don't need to unpack # - after restoring from cache, there will be a tar which we unpack and then delete if [ -f rootfs.tar ]; then + create_chroot_parent_dir $(realpath -m "${ROOTFSDIR}/..") + run_privileged_heredoc <<'EOF' mkdir -p ${ROOTFSDIR} - run_privileged tar -C ${ROOTFSDIR} -xp ${SSTATE_TAR_ATTR_FLAGS} < rootfs.tar + tar -C ${ROOTFSDIR} -xp ${SSTATE_TAR_ATTR_FLAGS} -f rootfs.tar +EOF rm rootfs.tar fi } diff --git a/meta/classes-recipe/sbuild.bbclass b/meta/classes-recipe/sbuild.bbclass index ea0c5841..ded311da 100644 --- a/meta/classes-recipe/sbuild.bbclass +++ b/meta/classes-recipe/sbuild.bbclass @@ -7,7 +7,8 @@ SCHROOT_MOUNTS ?= "" inherit crossvars -SBUILD_CHROOT ?= "${DEBDISTRONAME}-${SCHROOT_USER}-${ISAR_BUILD_UUID}-${@os.getpid()}" +SBUILD_CHROOT:unshare ?= "${SCHROOT_DIR}.tar.zst" +SBUILD_CHROOT:schroot ?= "${DEBDISTRONAME}-${SCHROOT_USER}-${ISAR_BUILD_UUID}-${@os.getpid()}" SBUILD_CONF_DIR ?= "${SCHROOT_CONF}/${SBUILD_CHROOT}" SCHROOT_CONF_FILE ?= "${SCHROOT_CONF}/chroot.d/${SBUILD_CHROOT}" @@ -144,6 +145,13 @@ END EOSUDO } +unshare_configure_ccache() { + # ccache must be below /build for file permissions to work properly + cat <<'EOF' >> ${SBUILD_CONFIG} +$path = "/usr/lib/ccache:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"; +EOF +} + sbuild_dpkg_log_export() { export dpkg_partial_log="${1}" @@ -152,3 +160,19 @@ sbuild_dpkg_log_export() { cat ${dpkg_partial_log} >> ${SCHROOT_DIR}/tmp/dpkg_common.log ) 9>"${SCHROOT_DIR}/tmp/dpkg_common.log.lock" } + +# additional mounts managed by sbuild +sbuild_add_unshare_mounts() { + mkdir -p "${CCACHE_DIR}" + # sbuild id from https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1110942 + setfacl -m u:${UNSHARE_SUBUID_BASE}:rwX -m u:${@int(d.getVar('UNSHARE_SUBUID_BASE')) + 999}:rwx "${CCACHE_DIR}" + + cat <<'EOF' >> ${SBUILD_CONFIG} +$unshare_bind_mounts = [ + { directory => '${WORKDIR}/rootfs', mountpoint => '${PP}/rootfs' }, + { directory => '${WORKDIR}/isar-apt/${DISTRO}-${DISTRO_ARCH}/apt/${DISTRO}', mountpoint => '/isar-apt' }, + { directory => '${REPO_BASE_DIR}', mountpoint => '/base-apt' }, + { directory => "${CCACHE_DIR}", mountpoint => "/ccache" } +]; +EOF +} diff --git a/meta/classes-recipe/sdk.bbclass b/meta/classes-recipe/sdk.bbclass index 074f5ef8..6086e9ce 100644 --- a/meta/classes-recipe/sdk.bbclass +++ b/meta/classes-recipe/sdk.bbclass @@ -74,13 +74,17 @@ rootfs_configure_isar_apt_dir() { ROOTFS_POSTPROCESS_COMMAND:prepend:class-sdk = "sdkchroot_configscript " sdkchroot_configscript () { - run_in_chroot ${ROOTFSDIR} /configscript.sh ${DISTRO_ARCH} + run_privileged_heredoc <<'EOF' + set -e + ${@insert_isar_mounts(d, d.getVar('ROOTFSDIR'), d.getVar('ROOTFS_MOUNTS')) if d.getVar('ISAR_CHROOT_MODE') == 'unshare' else ''} + cp -rL /etc/resolv.conf '${ROOTFSDIR}/etc' + chroot ${ROOTFSDIR} /configscript.sh ${DISTRO_ARCH} +EOF } ROOTFS_POSTPROCESS_COMMAND:append:class-sdk = " sdkchroot_finalize" sdkchroot_finalize() { - - rootfs_do_umounts + rootfs_do_umounts_priv # Remove setup scripts run_privileged rm -f ${ROOTFSDIR}/chroot-setup.sh ${ROOTFSDIR}/configscript.sh diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf index 0f84e715..1c3a6f4a 100644 --- a/meta/conf/bitbake.conf +++ b/meta/conf/bitbake.conf @@ -72,7 +72,7 @@ KERNEL_FILE:arm64 ?= "vmlinux" MACHINEOVERRIDES ?= "${MACHINE}" DISTROOVERRIDES ?= "${DISTRO}" -OVERRIDES = "${PACKAGE_ARCH}:${MACHINEOVERRIDES}:${DISTROOVERRIDES}:${BASE_DISTRO_CODENAME}:forcevariable" +OVERRIDES = "${PACKAGE_ARCH}:${MACHINEOVERRIDES}:${DISTROOVERRIDES}:${BASE_DISTRO_CODENAME}:${ISAR_CHROOT_MODE}:forcevariable" FILESOVERRIDES = "${PACKAGE_ARCH}:${MACHINE}" # Setting default QEMU_ARCH variables for different DISTRO_ARCH: @@ -151,6 +151,10 @@ ISAR_APT_RETRIES ??= "${@'10' if bb.utils.to_boolean(d.getVar('ISAR_USE_APT_SNAP ISAR_APT_DELAY_MAX ??= "${@'600' if bb.utils.to_boolean(d.getVar('ISAR_USE_APT_SNAPSHOT')) else ''}" ISAR_APT_SNAPSHOT_TIMESTAMP ??= "${SOURCE_DATE_EPOCH}" +# Rootless build execution +ISAR_ROOTLESS ??= "0" +ISAR_CHROOT_MODE ??= "${@'unshare' if bb.utils.to_boolean(d.getVar('ISAR_ROOTLESS')) else 'schroot'}" + # Default parallelism and resource usage for xz XZ_MEMLIMIT ?= "50%" XZ_THREADS ?= "${@oe.utils.cpu_count(at_least=2)}" @@ -206,6 +210,7 @@ CCACHE_DEBUG ?= "0" # Variables for tasks marking # Long term TODO: get rid of sudo marked tasks TASK_USE_NETWORK = "1" +# nested namespacing requires this as well TASK_USE_SUDO = "1" TASK_USE_NETWORK_AND_SUDO = "1" diff --git a/meta/recipes-core/isar-mmdebstrap/isar-mmdebstrap.inc b/meta/recipes-core/isar-mmdebstrap/isar-mmdebstrap.inc index 8ca295b7..c90bc59c 100644 --- a/meta/recipes-core/isar-mmdebstrap/isar-mmdebstrap.inc +++ b/meta/recipes-core/isar-mmdebstrap/isar-mmdebstrap.inc @@ -178,6 +178,8 @@ do_bootstrap() { umount \$1/$base_apt_tmp && rm ${WORKDIR}/mmtmpdir && \ umount $base_apt_tmp && rm -rf --one-file-system $base_apt_tmp" else + # prepare dl_dir for access from both sides (local and rootfs) + create_chroot_parent_dir ${WORKDIR}/dl_dir deb_dl_dir_import "${WORKDIR}/dl_dir" "${BOOTSTRAP_BASE_DISTRO}-${BASE_DISTRO_CODENAME}" bootstrap_list="${WORKDIR}/sources.list.d/bootstrap.list" @@ -197,6 +199,7 @@ do_bootstrap() { -o Dir::State="$1/var/lib/apt" \ -o Dir::Etc="$1/etc/apt" \ -o Dir::Cache="$1/var/cache/apt" \ + ${@'-o APT::Sandbox::User=root' if d.getVar('ISAR_CHROOT_MODE') == 'unshare' else ''} \ -o Apt::Architecture="${BOOTSTRAP_DISTRO_ARCH}" \ ${@get_apt_opts(d, '-o')}' extra_essential="$extra_essential && $syncout" @@ -214,13 +217,14 @@ do_bootstrap() { # Cleanup mounts if fails trap 'exit 1' INT HUP QUIT TERM ALRM USR1 - trap 'bootstrap_cleanup' EXIT + trap ${@'true' if d.getVar('ISAR_CHROOT_MODE') == 'unshare' else 'bootstrap_cleanup'} EXIT # Create lock file so that it is owned by the user running the build (not root) mkdir -p ${DEBDIR} touch ${DEB_DL_LOCK} - run_privileged TMPDIR="${BOOTSTRAP_TMPDIR}" mmdebstrap $bootstrap_args \ + ${@'' if d.getVar('ISAR_CHROOT_MODE') == 'unshare' else 'run_privileged'} \ + TMPDIR="${BOOTSTRAP_TMPDIR}" mmdebstrap $bootstrap_args \ $arch_param \ --mode=unshare \ ${MMHOOKS} \ @@ -239,6 +243,7 @@ do_bootstrap() { --customize-hook='sed -i "/en_US.UTF-8 UTF-8/s/^#//g" "$1/etc/locale.gen"' \ --customize-hook='chroot "$1" /usr/sbin/locale-gen' \ --customize-hook='chroot "$1" /usr/bin/apt-get -y clean' \ + ${@'--skip=output/dev' if d.getVar('ISAR_CHROOT_MODE') == 'unshare' else ''} \ --skip=cleanup/apt \ --skip=download/empty \ ${@get_apt_opts(d, '--aptopt')} \ @@ -252,7 +257,8 @@ do_bootstrap() { if [ "${ISAR_USE_CACHED_BASE_REPO}" != "1" ]; then deb_dl_dir_export "${WORKDIR}/dl_dir" "${BOOTSTRAP_BASE_DISTRO}-${BASE_DISTRO_CODENAME}" - run_privileged rm -rf --one-file-system "${WORKDIR}/dl_dir" + run_privileged find ${WORKDIR}/dl_dir -maxdepth 1 -mindepth 1 -exec rm -rf --one-file-system "{}" \; + rmdir ${WORKDIR}/dl_dir fi } addtask bootstrap before do_build after do_generate_keyrings diff --git a/meta/recipes-devtools/sbuild-chroot/sbuild-chroot.inc b/meta/recipes-devtools/sbuild-chroot/sbuild-chroot.inc index 61d37760..7a778d8c 100644 --- a/meta/recipes-devtools/sbuild-chroot/sbuild-chroot.inc +++ b/meta/recipes-devtools/sbuild-chroot/sbuild-chroot.inc @@ -66,8 +66,28 @@ ROOTFS_POSTPROCESS_COMMAND:remove = "rootfs_cleanup_base_apt" DEPLOY_SCHROOT = "${@d.getVar('SCHROOT_' + d.getVar('SBUILD_VARIANT').upper() + '_DIR')}${SBUILD_SCHROOT_SUFFIX}" -do_sbuildchroot_deploy[dirs] = "${DEPLOY_DIR}/schroot-${SBUILD_VARIANT}" -do_sbuildchroot_deploy() { +sbuildchroot_deploy_tree() { ln -Tfsr "${ROOTFSDIR}" "${DEPLOY_SCHROOT}" } +sbuildchroot_deploy_tar() { + lopts="--one-file-system --exclude=var/cache/apt/archives --exclude=isar-apt" + # we cannot use pzstd, as this results in a different magic + # (zstd skippable frame) which is not detected by sbuild + # https://salsa.debian.org/debian/sbuild/-/blob/d975d388a98627a0d7d112791e441c27a6d529df/lib/Sbuild/ChrootUnshare.pm#L608 + ZSTD="zstd -${SSTATE_ZSTD_CLEVEL} -T${ZSTD_THREADS}" + run_privileged \ + tar -C ${ROOTFSDIR} -cpS $lopts ${ROOTFS_TAR_ATTR_FLAGS} . \ + | $ZSTD > ${DEPLOY_SCHROOT}.tar.zst + # cleanup extracted rootfs + run_privileged rm -rf ${ROOTFSDIR} +} + +do_sbuildchroot_deploy[network] = "${TASK_USE_SUDO}" +do_sbuildchroot_deploy[dirs] += "${DEPLOY_DIR}/schroot-${SBUILD_VARIANT}" +python do_sbuildchroot_deploy() { + if d.getVar('ISAR_CHROOT_MODE') == 'unshare': + bb.build.exec_func('sbuildchroot_deploy_tar', d) + else: + bb.build.exec_func('sbuildchroot_deploy_tree', d) +} addtask sbuildchroot_deploy before do_build after do_rootfs