[PATCH v3 2/6] imager: Migrate from buildchroot to schroot

[Anton Mikanovich <amikan@ilbers.de>]

Install dependencies and perform all imager actions using schroot
instead of buildchroot. All the changes made during imager task will be
lost after the finish. This requires installing imager dependencies
during every run.

Signed-off-by: Anton Mikanovich <amikan@ilbers.de>
---
 meta/classes/image-tools-extension.bbclass | 94 +++++++++++++++-------
 1 file changed, 63 insertions(+), 31 deletions(-)

diff --git a/meta/classes/image-tools-extension.bbclass b/meta/classes/image-tools-extension.bbclass
index 2d3dda4..640c56c 100644
--- a/meta/classes/image-tools-extension.bbclass
+++ b/meta/classes/image-tools-extension.bbclass
@@ -5,43 +5,75 @@
 #
 # This file extends the image.bbclass to supply tools for futher imager functions
 
-inherit buildchroot
+inherit sbuild
 
 IMAGER_INSTALL ??= ""
 IMAGER_BUILD_DEPS ??= ""
 DEPENDS += "${IMAGER_BUILD_DEPS}"
 
-do_install_imager_deps[depends] = "${BUILDCHROOT_DEP} isar-apt:do_cache_config"
-do_install_imager_deps[deptask] = "do_deploy_deb"
-do_install_imager_deps[lockfiles] += "${REPO_ISAR_DIR}/isar.lock"
-do_install_imager_deps[network] = "${TASK_USE_NETWORK_AND_SUDO}"
-do_install_imager_deps() {
-    if [ -z "${@d.getVar("IMAGER_INSTALL", True).strip()}" ]; then
-        exit
-    fi
+SCHROOT_MOUNTS = "${WORKDIR}:${PP_WORK} ${IMAGE_ROOTFS}:${PP_ROOTFS} ${DEPLOY_DIR_IMAGE}:${PP_DEPLOY}"
+SCHROOT_MOUNTS += "${REPO_ISAR_DIR}/${DISTRO}:/isar-apt"
+
+imager_run() {
+    schroot_create_configs
+    insert_mounts
+
+    session_id=$(schroot -q -b -c ${SBUILD_CHROOT})
+    echo "Started session: ${session_id}"
+
+    # setting up error handler
+    imager_cleanup() {
+        set +e
+        schroot -q -f -e -c ${session_id} > /dev/null 2>&1
+        remove_mounts > /dev/null 2>&1
+        schroot_delete_configs > /dev/null 2>&1
+    }
+    trap 'exit 1' INT HUP QUIT TERM ALRM USR1
+    trap 'imager_cleanup' EXIT
+
+    if [ -n "${@d.getVar("IMAGER_INSTALL", True).strip()}" ]; then
+        echo "Installing deps: ${IMAGER_INSTALL}"
+
+        distro="${BASE_DISTRO}-${BASE_DISTRO_CODENAME}"
+        if [ ${ISAR_CROSS_COMPILE} -eq 1 ]; then
+            distro="${HOST_BASE_DISTRO}-${BASE_DISTRO_CODENAME}"
+        fi
 
-    distro="${BASE_DISTRO}-${BASE_DISTRO_CODENAME}"
-    if [ ${ISAR_CROSS_COMPILE} -eq 1 ]; then
-        distro="${HOST_BASE_DISTRO}-${BASE_DISTRO_CODENAME}"
+        # prepare isar-apt
+        schroot -r -c ${session_id} -d / -u root -- sh -c " \
+            mkdir -p '/etc/apt/sources.list.d'
+            echo 'deb [trusted=yes] file:///isar-apt ${DEBDISTRONAME} main' > \
+                '/etc/apt/sources.list.d/isar-apt.list'
+
+            mkdir -p '/etc/apt/preferences.d'
+            cat << EOF > '/etc/apt/preferences.d/isar-apt'
+Package: *
+Pin: release n=${DEBDISTRONAME}
+Pin-Priority: 1000
+EOF"
+
+        E="${@ isar_export_proxies(d)}"
+        deb_dl_dir_import ${SCHROOT_DIR} ${distro}
+        schroot -r -c ${session_id} -d / -u root -- sh -c " \
+            apt-get update \
+                -o Dir::Etc::SourceList='sources.list.d/isar-apt.list' \
+                -o Dir::Etc::SourceParts='-' \
+                -o APT::Get::List-Cleanup='0'
+            apt-get -o Debug::pkgProblemResolver=yes --no-install-recommends -y \
+                --allow-unauthenticated --allow-downgrades --download-only install \
+                ${IMAGER_INSTALL}"
+
+        deb_dl_dir_export ${SCHROOT_DIR} ${distro}
+        schroot -r -c ${session_id} -d / -u root -- sh -c " \
+            apt-get -o Debug::pkgProblemResolver=yes --no-install-recommends -y \
+                --allow-unauthenticated --allow-downgrades install \
+                ${IMAGER_INSTALL}"
     fi
 
-    buildchroot_do_mounts
-
-    E="${@ isar_export_proxies(d)}"
-    deb_dl_dir_import ${BUILDCHROOT_DIR} ${distro}
-    sudo -E chroot ${BUILDCHROOT_DIR} sh -c ' \
-        apt-get update \
-            -o Dir::Etc::SourceList="sources.list.d/isar-apt.list" \
-            -o Dir::Etc::SourceParts="-" \
-            -o APT::Get::List-Cleanup="0"
-        apt-get -o Debug::pkgProblemResolver=yes --no-install-recommends -y \
-            --allow-unauthenticated --allow-downgrades --download-only install \
-            ${IMAGER_INSTALL}'
-
-    deb_dl_dir_export ${BUILDCHROOT_DIR} ${distro}
-    sudo -E chroot ${BUILDCHROOT_DIR} sh -c ' \
-        apt-get -o Debug::pkgProblemResolver=yes --no-install-recommends -y \
-            --allow-unauthenticated --allow-downgrades install \
-            ${IMAGER_INSTALL}'
+    schroot -r -c ${session_id} "$@"
+
+    schroot -e -c ${session_id}
+
+    remove_mounts
+    schroot_delete_configs
 }
-addtask install_imager_deps before do_image_tools
-- 
2.34.1