[PATCH v3 03/16] download debs without locking

'Felix Moessbauer' via isar-users
2026-04-07T14:23:32Z

As we are only downloading and we are the only one acting on the rootfs,
it is safe to not lock the apt cache. By that, we can avoid complex file
ownerships in the tree.

Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
---
meta/classes-recipe/deb-dl-dir.bbclass | 2 +-
meta/classes-recipe/dpkg-source.bbclass | 2 +-
meta/classes-recipe/image-locales-extension.bbclass | 2 +-
meta/classes-recipe/image-tools-extension.bbclass | 3 ++-
meta/classes-recipe/rootfs.bbclass | 10 +---------
meta/lib/aptsrc_fetcher.py | 2 +-
6 files changed, 7 insertions(+), 14 deletions(-)

diff --git a/meta/classes-recipe/deb-dl-dir.bbclass b/meta/classes-recipe/deb-dl-dir.bbclass
index 3ea75996..e3f055c5 100644
--- a/meta/classes-recipe/deb-dl-dir.bbclass
+++ b/meta/classes-recipe/deb-dl-dir.bbclass
@@ -80,6 +80,7 @@ debsrc_download() {
--chdir "/deb-src/${rootfs_distro}/${src}" \
-- \
apt-get -o APT::Architecture=${DISTRO_ARCH} \
+ -oDebug::NoLocking=1 \
-o Dir="${rootfs}" -y --download-only \
--only-source source "${src}=${version}" \
|| echo "${src} ${version}" >> ${missing}
@@ -121,7 +122,6 @@ deb_dl_dir_import() {
# let our unprivileged user place downloaded packages in /var/cache/apt/archives/
sudo -Es << ' EOSUDO'
mkdir -p "${rootfs}"/var/cache/apt/archives/partial/
- touch "${rootfs}"/var/cache/apt/archives/lock
chown -R ${uid}:${gid} "${rootfs}"/var/cache/apt/archives/
EOSUDO

diff --git a/meta/classes-recipe/dpkg-source.bbclass b/meta/classes-recipe/dpkg-source.bbclass
index d14d56aa..629796d6 100644
--- a/meta/classes-recipe/dpkg-source.bbclass
+++ b/meta/classes-recipe/dpkg-source.bbclass
@@ -77,7 +77,7 @@ do_fetch_common_source() {
schroot -r -c ${session_id} -d / -- \
sh -c '
cd /work
- apt-get -y --download-only --only-source -o Acquire::Source-Symlinks="false" source ${DEBIAN_SOURCE}'
+ apt-get -y --download-only --only-source -o Debug::NoLocking=1 -o Acquire::Source-Symlinks="false" source ${DEBIAN_SOURCE}'

schroot -e -c ${session_id}
remove_mounts
diff --git a/meta/classes-recipe/image-locales-extension.bbclass b/meta/classes-recipe/image-locales-extension.bbclass
index 32666311..c90280aa 100644
--- a/meta/classes-recipe/image-locales-extension.bbclass
+++ b/meta/classes-recipe/image-locales-extension.bbclass
@@ -30,7 +30,7 @@ image_install_localepurge_download[weight] = "40"
image_install_localepurge_download[network] = "${TASK_USE_NETWORK_AND_SUDO}"
image_install_localepurge_download() {
sudo -E chroot '${ROOTFSDIR}' \
- /usr/bin/apt-get ${ROOTFS_APT_ARGS} --download-only localepurge
+ /usr/bin/apt-get ${ROOTFS_APT_ARGS} -oDebug::NoLocking=1 --download-only localepurge
}

ROOTFS_INSTALL_COMMAND += "image_install_localepurge_install"
diff --git a/meta/classes-recipe/image-tools-extension.bbclass b/meta/classes-recipe/image-tools-extension.bbclass
index ab616b7e..766f386d 100644
--- a/meta/classes-recipe/image-tools-extension.bbclass
+++ b/meta/classes-recipe/image-tools-extension.bbclass
@@ -54,7 +54,8 @@ imager_run() {
apt-get update \
-o Dir::Etc::SourceList='sources.list.d/isar-apt.list' \
-o Dir::Etc::SourceParts='-' \
- -o APT::Get::List-Cleanup='0'
+ -o APT::Get::List-Cleanup='0' \
+ -o Debug::NoLocking=1
apt-get -o Debug::pkgProblemResolver=yes --no-install-recommends -y \
--allow-unauthenticated --allow-downgrades --download-only install \
${local_install}"
diff --git a/meta/classes-recipe/rootfs.bbclass b/meta/classes-recipe/rootfs.bbclass
index 8b502a50..b201b97d 100644
--- a/meta/classes-recipe/rootfs.bbclass
+++ b/meta/classes-recipe/rootfs.bbclass
@@ -340,18 +340,10 @@ rootfs_install_pkgs_download[progress] = "custom:rootfs_progress.PkgsDownloadPro
rootfs_install_pkgs_download[isar-apt-lock] = "release-after"
rootfs_install_pkgs_download[network] = "${TASK_USE_NETWORK}"
rootfs_install_pkgs_download() {
- mkdir -p "${WORKDIR}/dpkg"
-
- # Use our own dpkg lock files rather than those in the rootfs since we are not root
- # (this is safe as there are no concurrent apt/dpkg operations for that rootfs)
- touch "${WORKDIR}/dpkg/lock" "${WORKDIR}/dpkg/lock-frontend"
-
# download packages using apt in a non-privileged namespace
rootfs_cmd --bind "${ROOTFSDIR}/var/cache/apt/archives" /var/cache/apt/archives \
- --bind "${WORKDIR}/dpkg/lock" /var/lib/dpkg/lock \
- --bind "${WORKDIR}/dpkg/lock-frontend" /var/lib/dpkg/lock-frontend \
${ROOTFSDIR} \
- -- /usr/bin/apt-get ${ROOTFS_APT_ARGS} --download-only ${ROOTFS_PACKAGES}
+ -- /usr/bin/apt-get ${ROOTFS_APT_ARGS} -oDebug::NoLocking=1 --download-only ${ROOTFS_PACKAGES}
}

ROOTFS_INSTALL_COMMAND_BEFORE_EXPORT ??= ""
diff --git a/meta/lib/aptsrc_fetcher.py b/meta/lib/aptsrc_fetcher.py
index 4fe5a9ea..da2d94c2 100644
--- a/meta/lib/aptsrc_fetcher.py
+++ b/meta/lib/aptsrc_fetcher.py
@@ -41,7 +41,7 @@ class AptSrc(FetchMethod):
set -e
mkdir -p /downloads/{ud.localfile}
cd /downloads/{ud.localfile}
- apt-get -y --download-only --only-source source {ud.src_package}
+ apt-get -y -oDebug::NoLocking=1 --download-only --only-source source {ud.src_package}
'
''', d)
except (OSError, FetchError):
--
2.53.0

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