From: badrikesh prusty <badrikes...@siemens.com>

When software is compiled, it's often "stripped" of debugging symbols to
reduce its size. Debug packages contain these debugging symbols. This allows
developers to get detailed stack traces when a program crashes. This helps
developers identify the exact location and cause of the crash.

Debug symbol packages (-dbg/-dbgsym) for .deb binaries in DEBDIR are cached
during rootfs_postprocess. Caching is disabled by default. To enable it, set
BASE_REPO_FEATURES:append = " cache-dbg-pkgs". During image build, the
rootfs_postprocess task downloads these packages to the rootfs, and
all the dbg packages syncing with the DEBDIR with the help of
rootfs_export_package_cache function.

Signed-off-by: badrikesh prusty <badrikes...@siemens.com>
---
meta/classes/deb-dl-dir.bbclass | 19 +++++++++++++++++++
meta/classes/image.bbclass | 1 +
meta/classes/rootfs.bbclass | 22 ++++++++++++++++++++++
3 files changed, 42 insertions(+)

diff --git a/meta/classes/deb-dl-dir.bbclass b/meta/classes/deb-dl-dir.bbclass
index 7ebd057e..311386ed 100644
--- a/meta/classes/deb-dl-dir.bbclass
+++ b/meta/classes/deb-dl-dir.bbclass
@@ -70,6 +70,25 @@ debsrc_download() {
debsrc_undo_mounts "${rootfs}"
}

+dbg_pkgs_download() {
+ export rootfs="$1"
+ export rootfs_distro="$2"
+
+ apt-ftparchive --md5=no --sha1=no --sha256=no --sha512=no \
+ -a "${DISTRO_ARCH}" packages \
+ "${rootfs}/var/cache/apt/archives" \
+ | awk '/^Package:/ {print $2}' \
+ | sort -u \
+ | while read pkg; do
+ apt-cache -o Dir=${rootfs} showsrc ${pkg} \
+ | awk '/^Package-List:/,/^$/' \
+ | grep -E "${pkg}-(dbg|dbgsym)" \
+ | grep "${DISTRO_ARCH}" \
+ | awk '!/Binary:/ {print $1}' \
+ | sort -u
+ done | xargs -r sudo -E chroot ${rootfs} sh -c '/usr/bin/apt-get -y --download-only install "$@"' --
+}
+
deb_dl_dir_import() {
export pc="${DEBDIR}/${2}"
export rootfs="${1}"
diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
index 56eca202..24c1cb38 100644
--- a/meta/classes/image.bbclass
+++ b/meta/classes/image.bbclass
@@ -73,6 +73,7 @@ ROOTFS_DPKGSTATUS_DEPLOY_DIR ?= "${DEPLOY_DIR_IMAGE}"
ROOTFS_PACKAGE_SUFFIX ?= "${PN}-${DISTRO}-${MACHINE}"

ROOTFS_POSTPROCESS_COMMAND:prepend = "${@bb.utils.contains('BASE_REPO_FEATURES', 'cache-deb-src', 'cache_deb_src', '', d)} "
+ROOTFS_POSTPROCESS_COMMAND:prepend = "${@bb.utils.contains('BASE_REPO_FEATURES', 'cache-dbg-pkgs', 'cache_dbg_pkgs', '', d)} "

inherit rootfs
inherit sdk
diff --git a/meta/classes/rootfs.bbclass b/meta/classes/rootfs.bbclass
index 2348e269..bdf0196b 100644
--- a/meta/classes/rootfs.bbclass
+++ b/meta/classes/rootfs.bbclass
@@ -293,6 +293,28 @@ cache_deb_src() {
fi
}

+ROOTFS_POSTPROCESS_COMMAND += "${@bb.utils.contains('ROOTFS_FEATURES', 'cache-dbg-pkgs', 'rootfs_export_package_cache', '', d)}"
+cache_dbg_pkgs() {
+ if [ -e "${ROOTFSDIR}"/etc/resolv.conf ] ||
+ [ -h "${ROOTFSDIR}"/etc/resolv.conf ]; then
+ sudo mv "${ROOTFSDIR}"/etc/resolv.conf "${ROOTFSDIR}"/etc/resolv.conf.isar
+ fi
+ rootfs_install_resolvconf
+ # Note: ISAR updates the apt state information(apt-get update) only once during bootstrap and
+ # relies on that through out the build. Copy that state information instead of apt-get update
+ # which generates a new state from upstream.
+ sudo tar -xf "${BOOTSTRAP_SRC}" ./var/lib/apt/lists --one-top-level="${ROOTFSDIR}"
+
+ deb_dl_dir_import ${ROOTFSDIR} ${ROOTFS_BASE_DISTRO}-${BASE_DISTRO_CODENAME}
+ dbg_pkgs_download ${ROOTFSDIR} ${ROOTFS_BASE_DISTRO}-${BASE_DISTRO_CODENAME}
+
+ sudo rm -f "${ROOTFSDIR}"/etc/resolv.conf
+ if [ -e "${ROOTFSDIR}"/etc/resolv.conf.isar ] ||
+ [ -h "${ROOTFSDIR}"/etc/resolv.conf.isar ]; then
+ sudo mv "${ROOTFSDIR}"/etc/resolv.conf.isar "${ROOTFSDIR}"/etc/resolv.conf
+ fi
+}
+
ROOTFS_POSTPROCESS_COMMAND += "${@bb.utils.contains('ROOTFS_FEATURES', 'clean-package-cache', 'rootfs_postprocess_clean_package_cache', '', d)}"
rootfs_postprocess_clean_package_cache() {
sudo -E chroot '${ROOTFSDIR}' \
--
2.39.5