[PATCH v4 0/3] pkg-database and systemd-sysext image

[PATCH v4 0/3] pkg-database and systemd-sysext image

[Johannes Schneider]

systemd-sysext allows to overlay another image (or multiple) ontop of
a "base-image" = the current rootfs, via the use of overlayfs; to add
tools and features meant for development purposes.

To quote the documentation on systemd-sysext:
" ...addition in order to make debugging/development easier). System
extension images should not be misunderstood as a generic software
packaging framework, ..."

To build a lean image, that only holds packages that are not already
part of the base-image, a snapshot of the package-database is taken
after the installation of the base-rootfs is done, and picked up again
when collecting the rootfs of such a extension image.

with all this in place an example usage could look like this:
some-core-image.bb
  inherit core-image
  IMAGE_GEN_PKGDBFS = "1"

extending-image.bb
  inherit image-sysext
  IMAGE_FSTYPES = "squashfs"
  IMAGE_BASE_PKGDB = "some-core-image"
  # the above pointing at a package-db similar to:
  # build/deploy/images/$MACHINE/some-core-image-$MACHINE-20240210172305-pkgdb.rootfs.tar.gz

then on the device, running some-core-image, with the extension image placed at FN:
$> ln -s "$FN" /run/extensions/$(basename $FN).raw
$> systemd-sysext list
$> SYSTEMD_LOG_LEVEL=debug systemd-sysext merge

As long as the VERSION_ID of the extension image matches the os-release
in the base image, the above commands return sucessfully;
for details on the compativility check see the docs for systemd-sysext.

=========

changes with v2:
        rebase from 'kirkstone' onto 'master'

changes with v3;
	incorporate review suggestions for simplification
	add task dependency handling
	add oe-selftest for the pkgdb handling
	add variable documentation and
	some more comments, and examples in the commit-msg

changes with v4;
	rebase onto 'master' => no functional changes
	fixed patchtest findings

[PATCH v4 1/3] image.bbclass/rootfs: archive and deploy package database

[Johannes Schneider]

archive the package database after the rootfs has been put together as
*rootfs-pkdbfs.tar.gz, and put it into the deploy folder.

This creates a snapshot of the package mangers state at the point in
time when all dependencies have been resolved and installed; which
could be used by "extension images" to built upon.

Signed-off-by: Johannes Schneider <johannes.schneider@leica-geosystems.com>
---
 meta/classes-recipe/image.bbclass             | 44 +++++++++++++++-
 meta/classes-recipe/image_types.bbclass       |  1 +
 meta/conf/documentation.conf                  |  1 +
 meta/lib/oe/package_manager/deb/rootfs.py     |  1 +
 meta/lib/oe/package_manager/ipk/rootfs.py     |  1 +
 meta/lib/oe/package_manager/rpm/rootfs.py     |  1 +
 meta/lib/oe/rootfs.py                         | 20 ++++++++
 meta/lib/oeqa/selftest/cases/imagefeatures.py | 51 +++++++++++++++++++
 8 files changed, 119 insertions(+), 1 deletion(-)

diff --git a/meta/classes-recipe/image.bbclass b/meta/classes-recipe/image.bbclass
index 28be6c6362..3ccaaa17b8 100644
--- a/meta/classes-recipe/image.bbclass
+++ b/meta/classes-recipe/image.bbclass
@@ -42,6 +42,9 @@ IMAGE_FEATURES ?= ""
 IMAGE_FEATURES[type] = "list"
 IMAGE_FEATURES[validitems] += "debug-tweaks read-only-rootfs read-only-rootfs-delayed-postinsts stateless-rootfs empty-root-password allow-empty-password allow-root-login serial-autologin-root post-install-logging overlayfs-etc"
 
+# Generate snapshot of the package database?
+IMAGE_GEN_PKGDBFS ?= "0"
+
 # Generate companion debugfs?
 IMAGE_GEN_DEBUGFS ?= "0"
 
@@ -131,7 +134,8 @@ def rootfs_variables(d):
                  'IMAGE_ROOTFS_MAXSIZE','IMAGE_NAME','IMAGE_LINK_NAME','IMAGE_MANIFEST','DEPLOY_DIR_IMAGE','IMAGE_FSTYPES','IMAGE_INSTALL_COMPLEMENTARY','IMAGE_LINGUAS', 'IMAGE_LINGUAS_COMPLEMENTARY', 'IMAGE_LOCALES_ARCHIVE',
                  'MULTILIBRE_ALLOW_REP','MULTILIB_TEMP_ROOTFS','MULTILIB_VARIANTS','MULTILIBS','ALL_MULTILIB_PACKAGE_ARCHS','MULTILIB_GLOBAL_VARIANTS','BAD_RECOMMENDATIONS','NO_RECOMMENDATIONS',
                  'PACKAGE_ARCHS','PACKAGE_CLASSES','TARGET_VENDOR','TARGET_ARCH','TARGET_OS','OVERRIDES','BBEXTENDVARIANT','FEED_DEPLOYDIR_BASE_URI','INTERCEPT_DIR','USE_DEVFS',
-                 'CONVERSIONTYPES', 'IMAGE_GEN_DEBUGFS', 'ROOTFS_RO_UNNEEDED', 'IMGDEPLOYDIR', 'PACKAGE_EXCLUDE_COMPLEMENTARY', 'REPRODUCIBLE_TIMESTAMP_ROOTFS', 'IMAGE_INSTALL_DEBUGFS']
+                 'CONVERSIONTYPES', 'IMAGE_GEN_PKGDBFS', 'IMAGE_GEN_DEBUGFS', 'ROOTFS_RO_UNNEEDED', 'IMGDEPLOYDIR', 'PACKAGE_EXCLUDE_COMPLEMENTARY', 'REPRODUCIBLE_TIMESTAMP_ROOTFS',
+                 'IMAGE_INSTALL_DEBUGFS']
     variables.extend(rootfs_command_variables(d))
     variables.extend(variable_depends(d))
     return " ".join(variables)
@@ -337,6 +341,17 @@ python do_image_qa_setscene () {
 }
 addtask do_image_qa_setscene
 
+def setup_pkgdbfs_variables(d):
+    d.appendVar('IMAGE_ROOTFS', '-pkgdb')
+    if d.getVar('IMAGE_LINK_NAME'):
+        d.appendVar('IMAGE_LINK_NAME', '-pkgdb')
+    d.appendVar('IMAGE_NAME','-pkgdb')
+    d.setVar('IMAGE_FSTYPES', 'tar.gz')
+
+python setup_pkgdbfs () {
+    setup_pkgdbfs_variables(d)
+}
+
 def setup_debugfs_variables(d):
     d.appendVar('IMAGE_ROOTFS', '-dbg')
     if d.getVar('IMAGE_LINK_NAME'):
@@ -381,6 +396,11 @@ python () {
     alltypes = d.getVar('IMAGE_FSTYPES').split()
     typedeps = {}
 
+    if d.getVar('IMAGE_GEN_PKGDBFS') == "1":
+        pkgdbfs_fstypes = ['tar.gz']
+        for t in pkgdbfs_fstypes:
+            alltypes.append("pkgdbfs_" + t)
+
     if d.getVar('IMAGE_GEN_DEBUGFS') == "1":
         debugfs_fstypes = d.getVar('IMAGE_FSTYPES_DEBUGFS').split()
         for t in debugfs_fstypes:
@@ -393,6 +413,10 @@ python () {
             basetypes[baset]= []
         if t not in basetypes[baset]:
             basetypes[baset].append(t)
+        pkgdb = ""
+        if t.startswith("pkgdbfs_"):
+            t = t[8:]
+            pkgdb = "pkgdbfs_"
         debug = ""
         if t.startswith("debugfs_"):
             t = t[8:]
@@ -401,6 +425,13 @@ python () {
         vardeps.add('IMAGE_TYPEDEP:' + t)
         if baset not in typedeps:
             typedeps[baset] = set()
+        deps = [pkgdb + dep for dep in deps]
+        for dep in deps:
+            if dep not in alltypes:
+                alltypes.append(dep)
+            _add_type(dep)
+            basedep = _image_base_type(dep)
+            typedeps[baset].add(basedep)
         deps = [debug + dep for dep in deps]
         for dep in deps:
             if dep not in alltypes:
@@ -419,6 +450,7 @@ python () {
 
     maskedtypes = (d.getVar('IMAGE_TYPES_MASKED') or "").split()
     maskedtypes = [dbg + t for t in maskedtypes for dbg in ("", "debugfs_")]
+    maskedtypes = [pkgdb + t for t in maskedtypes for pkgdb in ("", "pkgdbfs_")]
 
     for t in basetypes:
         vardeps = set()
@@ -430,6 +462,11 @@ python () {
             continue
 
         localdata = bb.data.createCopy(d)
+        pkgdb = ""
+        if t.startswith("pkgdbfs_"):
+            setup_pkgdbfs_variables(localdata)
+            pkgdb = "setup_pkgdbfs "
+            realt = t[8:]
         debug = ""
         if t.startswith("debugfs_"):
             setup_debugfs_variables(localdata)
@@ -468,6 +505,8 @@ python () {
             for ctype in sorted(ctypes):
                 if bt.endswith("." + ctype):
                     type = bt[0:-len(ctype) - 1]
+                    if type.startswith("pkgdbfs_"):
+                        type = type[8:]
                     if type.startswith("debugfs_"):
                         type = type[8:]
                     # Create input image first.
@@ -509,6 +548,9 @@ python () {
         d.setVarFlag(task, 'fakeroot', '1')
 
         d.appendVarFlag(task, 'prefuncs', ' ' + debug + ' set_image_size')
+        if pkgdb:
+            d.appendVarFlag(task, 'prefuncs', ' ' + pkgdb + ' set_image_size')
+
         d.prependVarFlag(task, 'postfuncs', 'create_symlinks ')
         d.appendVarFlag(task, 'subimages', ' ' + ' '.join(subimages))
         d.appendVarFlag(task, 'vardeps', ' ' + ' '.join(vardeps))
diff --git a/meta/classes-recipe/image_types.bbclass b/meta/classes-recipe/image_types.bbclass
index 3733bdfc20..39856a6368 100644
--- a/meta/classes-recipe/image_types.bbclass
+++ b/meta/classes-recipe/image_types.bbclass
@@ -25,6 +25,7 @@ def imagetypes_getdepends(d):
 
     fstypes = set((d.getVar('IMAGE_FSTYPES') or "").split())
     fstypes |= set((d.getVar('IMAGE_FSTYPES_DEBUGFS') or "").split())
+    fstypes |= set('tar.gz') # hardcoded for 'pkgdbfs'
 
     deprecated = set()
     deps = set()
diff --git a/meta/conf/documentation.conf b/meta/conf/documentation.conf
index b0591881ba..36aebb59ab 100644
--- a/meta/conf/documentation.conf
+++ b/meta/conf/documentation.conf
@@ -215,6 +215,7 @@ IMAGE_FEATURES[doc] = "The primary list of features to include in an image. Conf
 IMAGE_FSTYPES[doc] = "Formats of root filesystem images that you want to have created."
 IMAGE_FSTYPES_DEBUGFS[doc] = "Formats of the debug root filesystem images that you want to have created."
 IMAGE_GEN_DEBUGFS[doc] = "When set to '1', generate a companion debug object/source filesystem image."
+IMAGE_GEN_PKGDBFS[doc] = "When set to '1', create a snapshot of the package-manager state after the rootfs has been assembled."
 IMAGE_INSTALL[doc] = "Specifies the packages to install into an image. Image recipes set IMAGE_INSTALL to specify the packages to install into an image through image.bbclass."
 IMAGE_LINGUAS[doc] = "Specifies the list of locales to install into the image during the root filesystem construction process."
 IMAGE_NAME[doc] = "The name of the output image files minus the extension."
diff --git a/meta/lib/oe/package_manager/deb/rootfs.py b/meta/lib/oe/package_manager/deb/rootfs.py
index 1e25b64ed9..43107c8663 100644
--- a/meta/lib/oe/package_manager/deb/rootfs.py
+++ b/meta/lib/oe/package_manager/deb/rootfs.py
@@ -178,6 +178,7 @@ class PkgRootfs(DpkgOpkgRootfs):
         if self.progress_reporter:
             self.progress_reporter.next_stage()
 
+        self._setup_pkg_db_rootfs(['/var/lib/dpkg'])
         self._setup_dbg_rootfs(['/var/lib/dpkg'])
 
         self.pm.fix_broken_dependencies()
diff --git a/meta/lib/oe/package_manager/ipk/rootfs.py b/meta/lib/oe/package_manager/ipk/rootfs.py
index ba93eb62ea..64d9bc7969 100644
--- a/meta/lib/oe/package_manager/ipk/rootfs.py
+++ b/meta/lib/oe/package_manager/ipk/rootfs.py
@@ -319,6 +319,7 @@ class PkgRootfs(DpkgOpkgRootfs):
 
         opkg_lib_dir = self.d.getVar('OPKGLIBDIR')
         opkg_dir = os.path.join(opkg_lib_dir, 'opkg')
+        self._setup_pkg_db_rootfs([opkg_dir])
         self._setup_dbg_rootfs([opkg_dir])
 
         execute_pre_post_process(self.d, opkg_post_process_cmds)
diff --git a/meta/lib/oe/package_manager/rpm/rootfs.py b/meta/lib/oe/package_manager/rpm/rootfs.py
index 3ba5396320..673006c131 100644
--- a/meta/lib/oe/package_manager/rpm/rootfs.py
+++ b/meta/lib/oe/package_manager/rpm/rootfs.py
@@ -110,6 +110,7 @@ class PkgRootfs(Rootfs):
         if self.progress_reporter:
             self.progress_reporter.next_stage()
 
+        self._setup_pkg_db_rootfs(['/etc/rpm', '/etc/rpmrc', '/etc/dnf', '/var/lib/rpm', '/var/cache/dnf', '/var/lib/dnf'])
         self._setup_dbg_rootfs(['/etc/rpm', '/etc/rpmrc', '/etc/dnf', '/var/lib/rpm', '/var/cache/dnf', '/var/lib/dnf'])
 
         execute_pre_post_process(self.d, rpm_post_process_cmds)
diff --git a/meta/lib/oe/rootfs.py b/meta/lib/oe/rootfs.py
index 8cd48f9450..6d6e888a30 100644
--- a/meta/lib/oe/rootfs.py
+++ b/meta/lib/oe/rootfs.py
@@ -106,6 +106,26 @@ class Rootfs(object, metaclass=ABCMeta):
     def _cleanup(self):
         pass
 
+    def _setup_pkg_db_rootfs(self, package_paths):
+        gen_pkg_db_fs = bb.utils.to_boolean(self.d.getVar('IMAGE_GEN_PKGDBFS'))
+        if not gen_pkg_db_fs:
+           return
+
+        bb.note("  Creating pkg-db rootfs...")
+        try:
+            shutil.rmtree(self.image_rootfs + '-pkgdb')
+        except (FileNotFoundError, NotADirectoryError):
+            pass
+        bb.utils.mkdirhier(self.image_rootfs + "-pkgdb")
+
+        bb.note("  Copying back package database...")
+        for path in package_paths:
+            bb.utils.mkdirhier(self.image_rootfs + os.path.dirname(path))
+            if os.path.isdir(self.image_rootfs + path):
+                shutil.copytree(self.image_rootfs + path, self.image_rootfs + '-pkgdb' + path, symlinks=True)
+            elif os.path.isfile(self.image_rootfs + path):
+                shutil.copyfile(self.image_rootfs + path, self.image_rootfs + '-pkgdb' + path)
+
     def _setup_dbg_rootfs(self, package_paths):
         gen_debugfs = self.d.getVar('IMAGE_GEN_DEBUGFS') or '0'
         if gen_debugfs != '1':
diff --git a/meta/lib/oeqa/selftest/cases/imagefeatures.py b/meta/lib/oeqa/selftest/cases/imagefeatures.py
index dc88c222bd..9adde6c6f1 100644
--- a/meta/lib/oeqa/selftest/cases/imagefeatures.py
+++ b/meta/lib/oeqa/selftest/cases/imagefeatures.py
@@ -302,6 +302,57 @@ SKIP_RECIPE[busybox] = "Don't build this"
             result = runCmd('objdump --syms %s | grep debug' % t)
             self.assertTrue("debug" in result.output, msg='Failed to find debug symbol: %s' % result.output)
 
+    def test_image_gen_pkgdbfs(self):
+        """
+        Summary:     Check pkgdb snapshot
+        Expected:    1. core-image-minimal can be build with IMAGE_GEN_PKGDBFS variable set
+                     2. *rootfs-pkgdb.tar.gz snapshot of the package manager state is created,
+                        after the rootfs of the core-image-minimal is put together
+                     3. check that the restored package index is usable by the default packagemanager
+                        PACKAGE_CLASS=package_ipk -> opkg in this case.
+        """
+
+        image = 'core-image-minimal'
+        features = 'IMAGE_GEN_PKGDBFS = "1"\n'
+        self.write_config(features)
+
+        bitbake(image)
+
+        img_vars = get_bb_vars(['DEPLOY_DIR_IMAGE', 'IMAGE_LINK_NAME', 'MACHINE', 'DEFAULTTUNE'], image)
+
+        tar_file = os.path.join(img_vars['DEPLOY_DIR_IMAGE'], "%s-pkgdb.tar.gz" % (img_vars['IMAGE_LINK_NAME']))
+        self.assertTrue(os.path.exists(tar_file), 'pkgdb filesystem not generated at %s' % tar_file)
+        result = runCmd('cd %s; tar xvf %s' % (img_vars['DEPLOY_DIR_IMAGE'], tar_file))
+        self.assertEqual(result.status, 0, msg='Failed to extract %s: %s' % (tar_file, result.output))
+        self.assertTrue(os.path.exists(os.path.join(img_vars['DEPLOY_DIR_IMAGE'], 'var/lib/opkg/status')), 'opkg\'s status file was not present in: %s' % tar_file)
+
+        bitbake("opkg-native")
+        bitbake("build-sysroots -c build_native_sysroot")
+
+        native_vars = get_bb_vars(["STAGING_DIR", "BUILD_ARCH", "bindir_native", "libdir_native"])
+        stagingbindir = os.path.join(native_vars["STAGING_DIR"], native_vars["BUILD_ARCH"], native_vars["bindir_native"].lstrip(os.sep))
+
+        # some 'add-arch' have '-' replaced by '_', some not; adding both does not hurt
+        cmd = os.path.join(stagingbindir, 'opkg') + \
+            ' --volatile-cache --offline-root=%s --add-arch %s:11 --add-arch %s:12 list-installed' \
+            % (img_vars['DEPLOY_DIR_IMAGE'], img_vars["MACHINE"], img_vars["MACHINE"].replace('-','_'))
+        self.logger.debug('running cmd: %s' % cmd)
+        result = runCmd(cmd)
+        self.logger.debug("list-installed:\n%s" % result.output)
+        self.assertEqual(result.status, 0, msg='Failed to run package manager on unpacked pkgdb %s: %s' % (tar_file, result.output))
+        # check for a 'random, very architecture specific' package
+        self.assertTrue("kernel-image" in result.output, msg='Failed query installed packages')
+
+        cmd = os.path.join(stagingbindir, 'opkg') + \
+            ' --volatile-cache --offline-root=%s --add-arch %s:11 --add-arch %s:12 list-installed' \
+            % (img_vars['DEPLOY_DIR_IMAGE'], img_vars["DEFAULTTUNE"], img_vars["DEFAULTTUNE"].replace('-','_'))
+        self.logger.debug('running cmd: %s' % cmd)
+        result = runCmd(cmd)
+        self.logger.debug("list-installed:\n%s" % result.output)
+        self.assertEqual(result.status, 0, msg='Failed to run package manager on unpacked pkgdb %s: %s' % (tar_file, result.output))
+        # check for a common base package, a random library for example:
+        self.assertTrue("libc6" in result.output, msg='Failed query installed packages')
+
     def test_empty_image(self):
         """Test creation of image with no packages"""
         image = 'test-empty-image'
-- 
2.34.1

[PATCH v4 2/3] image.bbclass/rootfs: set and unpack package-database

[Johannes Schneider]

set the package-database of a "lower image" to unpack and build upon
when installing packages for the current image. This way a lean image
will be created, which only holds the packages that are not already
present in the lower image.

An image build such could then be used with overlayfs or systemd-
sysext to extend the "lower image" on demand; for development purposes
on a device running the "lower image" in RO mode for example.

A configuration could look as follows:
  some-core-image.bb
    inherit image
    IMAGE_GEN_PKGDBFS = "1"

  extending-image.bb
    inherit image
    IMAGE_BASE_PKGDB = "some-core-image"

Signed-off-by: Johannes Schneider <johannes.schneider@leica-geosystems.com>
---
 meta/classes-recipe/image.bbclass             | 23 ++++++++--
 meta/conf/documentation.conf                  |  3 +-
 meta/lib/oe/package_manager/deb/rootfs.py     |  2 +
 meta/lib/oe/package_manager/ipk/rootfs.py     |  6 ++-
 meta/lib/oe/package_manager/rpm/rootfs.py     |  7 ++-
 meta/lib/oe/rootfs.py                         | 18 ++++++++
 meta/lib/oeqa/selftest/cases/imagefeatures.py | 46 +++++++++++++++++++
 7 files changed, 97 insertions(+), 8 deletions(-)

diff --git a/meta/classes-recipe/image.bbclass b/meta/classes-recipe/image.bbclass
index 3ccaaa17b8..c573c37cd8 100644
--- a/meta/classes-recipe/image.bbclass
+++ b/meta/classes-recipe/image.bbclass
@@ -42,8 +42,16 @@ IMAGE_FEATURES ?= ""
 IMAGE_FEATURES[type] = "list"
 IMAGE_FEATURES[validitems] += "debug-tweaks read-only-rootfs read-only-rootfs-delayed-postinsts stateless-rootfs empty-root-password allow-empty-password allow-root-login serial-autologin-root post-install-logging overlayfs-etc"
 
-# Generate snapshot of the package database?
+# Image layering:
+# a "base image" would create a snapshot of the package-database after the
+# installation of all packages into the rootfs is done. The next/other image
+# "layered on-top" of the former would then import that database and install
+# further packages; without reinstalling packages/dependencies that are already
+# installed in the layer below.
+# Set to '1' in a "base image" recipe, to preserve a snapshot of the package database.
 IMAGE_GEN_PKGDBFS ?= "0"
+# "PN" of a "base image", upon which the current image is to be built upon.
+IMAGE_BASE_PKGDB ?= ""
 
 # Generate companion debugfs?
 IMAGE_GEN_DEBUGFS ?= "0"
@@ -118,6 +126,15 @@ do_rootfs[depends] += " \
 "
 do_rootfs[recrdeptask] += "do_packagedata"
 
+python () {
+    # make sure that the 'base image' has been queued in before this
+    # image wants to unpack and build upon the formers pgkdb
+    base_image = d.getVar('IMAGE_BASE_PKGDB')
+    pn = d.getVar('PN')
+    if base_image and base_image != pn:
+        d.appendVarFlag("do_rootfs", 'depends', ' '+ base_image + ':do_image_complete')
+}
+
 def rootfs_command_variables(d):
     return ['ROOTFS_POSTPROCESS_COMMAND','ROOTFS_PREPROCESS_COMMAND','ROOTFS_POSTINSTALL_COMMAND','ROOTFS_POSTUNINSTALL_COMMAND','OPKG_PREPROCESS_COMMANDS','OPKG_POSTPROCESS_COMMANDS','IMAGE_POSTPROCESS_COMMAND',
             'IMAGE_PREPROCESS_COMMAND','RPM_PREPROCESS_COMMANDS','RPM_POSTPROCESS_COMMANDS','DEB_PREPROCESS_COMMANDS','DEB_POSTPROCESS_COMMANDS']
@@ -134,8 +151,8 @@ def rootfs_variables(d):
                  'IMAGE_ROOTFS_MAXSIZE','IMAGE_NAME','IMAGE_LINK_NAME','IMAGE_MANIFEST','DEPLOY_DIR_IMAGE','IMAGE_FSTYPES','IMAGE_INSTALL_COMPLEMENTARY','IMAGE_LINGUAS', 'IMAGE_LINGUAS_COMPLEMENTARY', 'IMAGE_LOCALES_ARCHIVE',
                  'MULTILIBRE_ALLOW_REP','MULTILIB_TEMP_ROOTFS','MULTILIB_VARIANTS','MULTILIBS','ALL_MULTILIB_PACKAGE_ARCHS','MULTILIB_GLOBAL_VARIANTS','BAD_RECOMMENDATIONS','NO_RECOMMENDATIONS',
                  'PACKAGE_ARCHS','PACKAGE_CLASSES','TARGET_VENDOR','TARGET_ARCH','TARGET_OS','OVERRIDES','BBEXTENDVARIANT','FEED_DEPLOYDIR_BASE_URI','INTERCEPT_DIR','USE_DEVFS',
-                 'CONVERSIONTYPES', 'IMAGE_GEN_PKGDBFS', 'IMAGE_GEN_DEBUGFS', 'ROOTFS_RO_UNNEEDED', 'IMGDEPLOYDIR', 'PACKAGE_EXCLUDE_COMPLEMENTARY', 'REPRODUCIBLE_TIMESTAMP_ROOTFS',
-                 'IMAGE_INSTALL_DEBUGFS']
+                 'CONVERSIONTYPES', 'IMAGE_GEN_PKGDBFS', 'IMAGE_BASE_PKGDB', 'IMAGE_GEN_DEBUGFS', 'ROOTFS_RO_UNNEEDED', 'IMGDEPLOYDIR', 'PACKAGE_EXCLUDE_COMPLEMENTARY',
+                 'REPRODUCIBLE_TIMESTAMP_ROOTFS', 'IMAGE_INSTALL_DEBUGFS']
     variables.extend(rootfs_command_variables(d))
     variables.extend(variable_depends(d))
     return " ".join(variables)
diff --git a/meta/conf/documentation.conf b/meta/conf/documentation.conf
index 36aebb59ab..9f493cfe96 100644
--- a/meta/conf/documentation.conf
+++ b/meta/conf/documentation.conf
@@ -208,6 +208,7 @@ ICECC_PATH[doc] = "The location of the icecc binary."
 ICECC_CLASS_DISABLE[doc] = "Identifies user classes that you do not want the Icecream distributed compile support to consider."
 ICECC_RECIPE_DISABLE[doc] = "Identifies user recipes that you do not want the Icecream distributed compile support to consider."
 ICECC_RECIPE_ENABLE[doc] = "Identifies user recipes that use an empty PARALLEL_MAKE variable that you want to force remote distributed compilation on using the Icecream distributed compile support."
+IMAGE_BASE_PKGDB[doc] = "Set to the PN of a base-image name, which was built with IMAGE_GEN_PKGDBFS enabled; Then this image will only add/install packages into its rootfs that are not already in the base-image."
 IMAGE_BASENAME[doc] = "The base name of image output files."
 IMAGE_BOOT_FILES[doc] = "Whitespace separated list of files from ${DEPLOY_DIR_IMAGE} to place in boot partition. Entries will be installed under a same name as the source file. To change the destination file name, pass a desired name after a semicolon (eg. u-boot.img;uboot)."
 IMAGE_CLASSES[doc] = "A list of classes that all images should inherit."
@@ -215,7 +216,7 @@ IMAGE_FEATURES[doc] = "The primary list of features to include in an image. Conf
 IMAGE_FSTYPES[doc] = "Formats of root filesystem images that you want to have created."
 IMAGE_FSTYPES_DEBUGFS[doc] = "Formats of the debug root filesystem images that you want to have created."
 IMAGE_GEN_DEBUGFS[doc] = "When set to '1', generate a companion debug object/source filesystem image."
-IMAGE_GEN_PKGDBFS[doc] = "When set to '1', create a snapshot of the package-manager state after the rootfs has been assembled."
+IMAGE_GEN_PKGDBFS[doc] = "When set to '1', create a snapshot of the package-manager state after the rootfs has been assembled; This snapshot can then be used in a different image recipe, that sets IMAGE_BASE_PKGDB to this images PN."
 IMAGE_INSTALL[doc] = "Specifies the packages to install into an image. Image recipes set IMAGE_INSTALL to specify the packages to install into an image through image.bbclass."
 IMAGE_LINGUAS[doc] = "Specifies the list of locales to install into the image during the root filesystem construction process."
 IMAGE_NAME[doc] = "The name of the output image files minus the extension."
diff --git a/meta/lib/oe/package_manager/deb/rootfs.py b/meta/lib/oe/package_manager/deb/rootfs.py
index 43107c8663..71a21df09b 100644
--- a/meta/lib/oe/package_manager/deb/rootfs.py
+++ b/meta/lib/oe/package_manager/deb/rootfs.py
@@ -152,6 +152,8 @@ class PkgRootfs(DpkgOpkgRootfs):
 
         execute_pre_post_process(self.d, deb_pre_process_cmds)
 
+        self._unpack_pkg_db_rootfs(['/var/lib/dpkg'])
+
         if self.progress_reporter:
             self.progress_reporter.next_stage()
             # Don't support incremental, so skip that
diff --git a/meta/lib/oe/package_manager/ipk/rootfs.py b/meta/lib/oe/package_manager/ipk/rootfs.py
index 64d9bc7969..408faa8030 100644
--- a/meta/lib/oe/package_manager/ipk/rootfs.py
+++ b/meta/lib/oe/package_manager/ipk/rootfs.py
@@ -276,12 +276,16 @@ class PkgRootfs(DpkgOpkgRootfs):
         pkgs_to_install = self.manifest.parse_initial_manifest()
         opkg_pre_process_cmds = self.d.getVar('OPKG_PREPROCESS_COMMANDS')
         opkg_post_process_cmds = self.d.getVar('OPKG_POSTPROCESS_COMMANDS')
+        opkg_lib_dir = self.d.getVar('OPKGLIBDIR')
+        opkg_dir = os.path.join(opkg_lib_dir, 'opkg')
 
         # update PM index files
         self.pm.write_index()
 
         execute_pre_post_process(self.d, opkg_pre_process_cmds)
 
+        self._unpack_pkg_db_rootfs([opkg_dir])
+
         if self.progress_reporter:
             self.progress_reporter.next_stage()
             # Steps are a bit different in order, skip next
@@ -317,8 +321,6 @@ class PkgRootfs(DpkgOpkgRootfs):
         if self.progress_reporter:
             self.progress_reporter.next_stage()
 
-        opkg_lib_dir = self.d.getVar('OPKGLIBDIR')
-        opkg_dir = os.path.join(opkg_lib_dir, 'opkg')
         self._setup_pkg_db_rootfs([opkg_dir])
         self._setup_dbg_rootfs([opkg_dir])
 
diff --git a/meta/lib/oe/package_manager/rpm/rootfs.py b/meta/lib/oe/package_manager/rpm/rootfs.py
index 673006c131..9986b13b5f 100644
--- a/meta/lib/oe/package_manager/rpm/rootfs.py
+++ b/meta/lib/oe/package_manager/rpm/rootfs.py
@@ -67,12 +67,15 @@ class PkgRootfs(Rootfs):
         pkgs_to_install = self.manifest.parse_initial_manifest()
         rpm_pre_process_cmds = self.d.getVar('RPM_PREPROCESS_COMMANDS')
         rpm_post_process_cmds = self.d.getVar('RPM_POSTPROCESS_COMMANDS')
+        package_paths = ['/etc/rpm', '/etc/rpmrc', '/etc/dnf', '/var/lib/rpm', '/var/cache/dnf', '/var/lib/dnf']
 
         # update PM index files
         self.pm.write_index()
 
         execute_pre_post_process(self.d, rpm_pre_process_cmds)
 
+        self._unpack_pkg_db_rootfs(package_paths)
+
         if self.progress_reporter:
             self.progress_reporter.next_stage()
 
@@ -110,8 +113,8 @@ class PkgRootfs(Rootfs):
         if self.progress_reporter:
             self.progress_reporter.next_stage()
 
-        self._setup_pkg_db_rootfs(['/etc/rpm', '/etc/rpmrc', '/etc/dnf', '/var/lib/rpm', '/var/cache/dnf', '/var/lib/dnf'])
-        self._setup_dbg_rootfs(['/etc/rpm', '/etc/rpmrc', '/etc/dnf', '/var/lib/rpm', '/var/cache/dnf', '/var/lib/dnf'])
+        self._setup_pkg_db_rootfs(package_paths)
+        self._setup_dbg_rootfs(package_paths)
 
         execute_pre_post_process(self.d, rpm_post_process_cmds)
 
diff --git a/meta/lib/oe/rootfs.py b/meta/lib/oe/rootfs.py
index 6d6e888a30..9d691c58cd 100644
--- a/meta/lib/oe/rootfs.py
+++ b/meta/lib/oe/rootfs.py
@@ -106,6 +106,24 @@ class Rootfs(object, metaclass=ABCMeta):
     def _cleanup(self):
         pass
 
+    def _unpack_pkg_db_rootfs(self, package_paths):
+        import tarfile
+        pn = self.d.getVar('PN')
+        base_pkgdb = self.d.getVar('IMAGE_BASE_PKGDB')
+        if not base_pkgdb or pn == base_pkgdb:
+            return
+
+        fname = self.d.getVar('DEPLOY_DIR_IMAGE') + '/' + self.d.getVar('IMAGE_BASE_PKGDB') + '-' + self.d.getVar('MACHINE')  + '.rootfs-pkgdb.tar.gz'
+        if not os.path.exists(fname):
+            bb.fatal("PKGDB for '%s' does not exist,\n\texpected: %s\n\tthe recipe for '%s' should set: IMAGE_GEN_PKGDBFS='1'" % (base_pkgdb, fname, base_pkgdb))
+            return
+
+        bb.note("  unpacking base image package database...")
+        if fname.endswith("tar.gz"):
+            tar = tarfile.open(fname, "r:gz")
+            tar.extractall(path=self.image_rootfs)
+            tar.close()
+
     def _setup_pkg_db_rootfs(self, package_paths):
         gen_pkg_db_fs = bb.utils.to_boolean(self.d.getVar('IMAGE_GEN_PKGDBFS'))
         if not gen_pkg_db_fs:
diff --git a/meta/lib/oeqa/selftest/cases/imagefeatures.py b/meta/lib/oeqa/selftest/cases/imagefeatures.py
index 9adde6c6f1..bd2ee894f7 100644
--- a/meta/lib/oeqa/selftest/cases/imagefeatures.py
+++ b/meta/lib/oeqa/selftest/cases/imagefeatures.py
@@ -353,6 +353,52 @@ SKIP_RECIPE[busybox] = "Don't build this"
         # check for a common base package, a random library for example:
         self.assertTrue("libc6" in result.output, msg='Failed query installed packages')
 
+    def test_image_use_pkgdbfs(self):
+        """
+        Summary:     Check pkgdb snapshot
+        Expected:    1. core-image-minimal is built with IMAGE_GEN_PKGDBFS variable set
+                     2. core-image-minimal-mtdutils is built with:
+                        IMAGE_BASE_PKGDB pointing to the former, to build upon it
+                     3. the rootfs of both images is checked, and there should be no file
+                        from any of the installed packages that shows up in both images
+        """
+
+        base_image = 'core-image-minimal'
+        extension_image = 'core-image-minimal-mtdutils'
+
+        features = 'IMAGE_FSTYPES = "tar.bz2"\n'
+        # enable usrmerge so that all relevant pieces are in one place = /usr
+        features += 'DISTRO_FEATURES += "usrmerge"\n'
+        features += 'IMAGE_GEN_PKGDBFS = "1"\n'
+        features += 'IMAGE_BASE_PKGDB = "%s"\n' % base_image
+        self.write_config(features)
+
+        # through task dependencies the base_image should automagically be built
+        bitbake(extension_image)
+
+        # collect image content of both images
+        img_vars = get_bb_vars(['DEPLOY_DIR_IMAGE', 'IMAGE_LINK_NAME'], base_image)
+        img_file = os.path.join(img_vars['DEPLOY_DIR_IMAGE'], "%s.%s" % (img_vars['IMAGE_LINK_NAME'], 'tar.bz2'))
+        self.logger.debug("base image: %s" % img_file)
+        img_content = runCmd('tar -tf %s' % img_file)
+
+        ext_vars = get_bb_vars(['DEPLOY_DIR_IMAGE', 'IMAGE_LINK_NAME'], extension_image)
+        ext_file = os.path.join(ext_vars['DEPLOY_DIR_IMAGE'], "%s.%s" % (ext_vars['IMAGE_LINK_NAME'], 'tar.bz2'))
+        self.logger.debug("extension image: %s" % ext_file)
+        ext_content = runCmd('tar -tf %s' % ext_file)
+
+        # filter out folders and anything outside of /usr
+        img_files = [ x for x in img_content.output.splitlines() if not x.endswith('/') and x.startswith('./usr/') ]
+        self.logger.debug("image files:\n%s" % img_files)
+        ext_files = [ x for x in ext_content.output.splitlines() if not x.endswith('/') and x.startswith('./usr/') ]
+
+        # check mutual exclusive content listing
+        self.logger.debug("extension files:\n%s" % ext_files)
+        for i in img_files:
+            self.assertTrue(i not in ext_files, "found %s in extension" % i)
+        for e in ext_files:
+            self.assertTrue(e not in img_files, "found %s in base-image" % e)
+
     def test_empty_image(self):
         """Test creation of image with no packages"""
         image = 'test-empty-image'
-- 
2.34.1

[PATCH v4 3/3] classes: add a systemd-sysext image class

[Johannes Schneider]

systemd-sysext can load a raw-image containing usr/ and opt/ folders
to mount them as RO overlay over the rootfs, to "extend" the systems.

This class provides the necessary changes/additions to the enclosed
file-system so that systemd-sysext accepts the extension for "merge"
into the rootfs.

With such an created image, placed into the correct folder (see [1]),
`systemd-sysext list` should be able to list the "extension" and
`systemd-sysext merge` should enable the overlay. On both commands a
preceding "SYSTEMD_LOG_LEVEL=debug" can aide in figuring out what is
amiss.

The strict name checking systemd-sysext does against the name of
extension-release.NAME file, is disabled, as there is only one such in
the resulting image. This is done to allow a user to freely rename the
resulting image file.
Note that for e.g. squashfs, the kernel needs CONFIG_SQUASHFS_XATTR=y

Link: https://www.freedesktop.org/software/systemd/man/latest/systemd-sysext.html
Link: https://0pointer.net/blog/testing-my-system-code-in-usr-without-modifying-usr.html
Signed-off-by: Johannes Schneider <johannes.schneider@leica-geosystems.com>
---
 meta/classes-recipe/image-sysext.bbclass | 42 ++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 meta/classes-recipe/image-sysext.bbclass

diff --git a/meta/classes-recipe/image-sysext.bbclass b/meta/classes-recipe/image-sysext.bbclass
new file mode 100644
index 0000000000..012db83353
--- /dev/null
+++ b/meta/classes-recipe/image-sysext.bbclass
@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: MIT
+#
+# Copyright Leica Geosystems AG
+#
+
+# systemd-sysext [1] has a simple mechanism for version compatibility:
+# the extension to be loaded has to contain a
+# /usr/lib/extension-release.d/extension-release.NAME
+# with "NAME" *exactly* matching the filename of the extensions
+# raw-device filename/
+#
+# from the extension-release file the "ID" and "VERSION_ID" fields are
+# matched against the etc/os-release and the extension is only "merged"
+# if no mismatches between NAME, ID, and VERSION_ID.
+#
+# Link: https://www.freedesktop.org/software/systemd/man/latest/systemd-sysext.html
+
+inherit image
+
+IMAGE_NAME_SUFFIX = ".sysext"
+EXTENSION_NAME = "${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.${IMAGE_FSTYPES}"
+
+DEPENDS += " os-release"
+
+sysext_image_mangle_rootfs() {
+    R=${IMAGE_ROOTFS}
+
+    # pull a copy of the rootfs version information, which systemd-sysext matches against
+    cp -av ${RECIPE_SYSROOT}/${nonarch_libdir}/os-release ${WORKDIR}/extension-release.base
+
+    echo 'EXTENSION_RELOAD_MANAGER=1' >> ${WORKDIR}/extension-release.base
+
+    install -d $R${nonarch_libdir}/extension-release.d
+    install -m 0644 ${WORKDIR}/extension-release.base \
+        $R${nonarch_libdir}/extension-release.d/extension-release.${EXTENSION_NAME}
+
+    # disable systemd-sysext's strict name checking, so that the image file can be renamed, while still being 'merge'-able
+    setfattr -n user.extension-release.strict -v false \
+        $R${nonarch_libdir}/extension-release.d/extension-release.${EXTENSION_NAME}
+}
+
+ROOTFS_POSTPROCESS_COMMAND += " sysext_image_mangle_rootfs; "
-- 
2.34.1

Re: [OE-core] [PATCH v4 0/3] pkg-database and systemd-sysext image

[Alexander Kanavin]

There is a feature freeze now, so this might have to wait for after that.

Alex

On Mon, 4 Mar 2024 at 07:16, Johannes Schneider via
lists.openembedded.org
<johannes.schneider=leica-geosystems.com@lists.openembedded.org>
wrote:
>
> systemd-sysext allows to overlay another image (or multiple) ontop of
> a "base-image" = the current rootfs, via the use of overlayfs; to add
> tools and features meant for development purposes.
>
> To quote the documentation on systemd-sysext:
> " ...addition in order to make debugging/development easier). System
> extension images should not be misunderstood as a generic software
> packaging framework, ..."
>
> To build a lean image, that only holds packages that are not already
> part of the base-image, a snapshot of the package-database is taken
> after the installation of the base-rootfs is done, and picked up again
> when collecting the rootfs of such a extension image.
>
> with all this in place an example usage could look like this:
> some-core-image.bb
>   inherit core-image
>   IMAGE_GEN_PKGDBFS = "1"
>
> extending-image.bb
>   inherit image-sysext
>   IMAGE_FSTYPES = "squashfs"
>   IMAGE_BASE_PKGDB = "some-core-image"
>   # the above pointing at a package-db similar to:
>   # build/deploy/images/$MACHINE/some-core-image-$MACHINE-20240210172305-pkgdb.rootfs.tar.gz
>
> then on the device, running some-core-image, with the extension image placed at FN:
> $> ln -s "$FN" /run/extensions/$(basename $FN).raw
> $> systemd-sysext list
> $> SYSTEMD_LOG_LEVEL=debug systemd-sysext merge
>
> As long as the VERSION_ID of the extension image matches the os-release
> in the base image, the above commands return sucessfully;
> for details on the compativility check see the docs for systemd-sysext.
>
> =========
>
> changes with v2:
>         rebase from 'kirkstone' onto 'master'
>
> changes with v3;
>         incorporate review suggestions for simplification
>         add task dependency handling
>         add oe-selftest for the pkgdb handling
>         add variable documentation and
>         some more comments, and examples in the commit-msg
>
> changes with v4;
>         rebase onto 'master' => no functional changes
>         fixed patchtest findings
>
> -=-=-=-=-=-=-=-=-=-=-=-
> Links: You receive all messages sent to this group.
> View/Reply Online (#196588): https://lists.openembedded.org/g/openembedded-core/message/196588
> Mute This Topic: https://lists.openembedded.org/mt/104717642/1686489
> Group Owner: openembedded-core+owner@lists.openembedded.org
> Unsubscribe: https://lists.openembedded.org/g/openembedded-core/unsub [alex.kanavin@gmail.com]
> -=-=-=-=-=-=-=-=-=-=-=-
>

Re: [OE-core] [PATCH v4 0/3] pkg-database and systemd-sysext image

[SCHNEIDER Johannes]

Hoi Alex,


thanks for the heads up - i'll patiently wait then :-)


gruß
Johannes

________________________________________
From: Alexander Kanavin <alex.kanavin@gmail.com>
Sent: Monday, March 4, 2024 10:25
To: SCHNEIDER Johannes
Cc: openembedded-core@lists.openembedded.org; richard.purdie@linuxfoundation.org
Subject: Re: [OE-core] [PATCH v4 0/3] pkg-database and systemd-sysext image

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There is a feature freeze now, so this might have to wait for after that.

Alex

On Mon, 4 Mar 2024 at 07:16, Johannes Schneider via
lists.openembedded.org
<johannes.schneider=leica-geosystems.com@lists.openembedded.org>
wrote:
>
> systemd-sysext allows to overlay another image (or multiple) ontop of
> a "base-image" = the current rootfs, via the use of overlayfs; to add
> tools and features meant for development purposes.
>
> To quote the documentation on systemd-sysext:
> " ...addition in order to make debugging/development easier). System
> extension images should not be misunderstood as a generic software
> packaging framework, ..."
>
> To build a lean image, that only holds packages that are not already
> part of the base-image, a snapshot of the package-database is taken
> after the installation of the base-rootfs is done, and picked up again
> when collecting the rootfs of such a extension image.
>
> with all this in place an example usage could look like this:
> some-core-image.bb
>   inherit core-image
>   IMAGE_GEN_PKGDBFS = "1"
>
> extending-image.bb
>   inherit image-sysext
>   IMAGE_FSTYPES = "squashfs"
>   IMAGE_BASE_PKGDB = "some-core-image"
>   # the above pointing at a package-db similar to:
>   # build/deploy/images/$MACHINE/some-core-image-$MACHINE-20240210172305-pkgdb.rootfs.tar.gz
>
> then on the device, running some-core-image, with the extension image placed at FN:
> $> ln -s "$FN" /run/extensions/$(basename $FN).raw
> $> systemd-sysext list
> $> SYSTEMD_LOG_LEVEL=debug systemd-sysext merge
>
> As long as the VERSION_ID of the extension image matches the os-release
> in the base image, the above commands return sucessfully;
> for details on the compativility check see the docs for systemd-sysext.
>
> =========
>
> changes with v2:
>         rebase from 'kirkstone' onto 'master'
>
> changes with v3;
>         incorporate review suggestions for simplification
>         add task dependency handling
>         add oe-selftest for the pkgdb handling
>         add variable documentation and
>         some more comments, and examples in the commit-msg
>
> changes with v4;
>         rebase onto 'master' => no functional changes
>         fixed patchtest findings
>
> -=-=-=-=-=-=-=-=-=-=-=-
> Links: You receive all messages sent to this group.
> View/Reply Online (#196588): https://lists.openembedded.org/g/openembedded-core/message/196588
> Mute This Topic: https://lists.openembedded.org/mt/104717642/1686489
> Group Owner: openembedded-core+owner@lists.openembedded.org
> Unsubscribe: https://lists.openembedded.org/g/openembedded-core/unsub [alex.kanavin@gmail.com]
> -=-=-=-=-=-=-=-=-=-=-=-
>

Re: [OE-core] [PATCH v4 0/3] pkg-database and systemd-sysext image

[Alexandre Belloni]

Hello,

The series causes failures on the autobuilders:

https://autobuilder.yoctoproject.org/typhoon/#/builders/79/builds/6548/steps/14/logs/stdio


2024-03-21 21:05:49,848 - oe-selftest - INFO - 6: 20/46 500/587 (137.73s) (0 failed) (imagefeatures.ImageFeatures.test_image_gen_pkgdbfs)
2024-03-21 21:05:49,848 - oe-selftest - INFO - testtools.testresult.real._StringException: Traceback (most recent call last):
  File "/home/pokybuild/yocto-worker/oe-selftest-centos/build/meta/lib/oeqa/selftest/cases/imagefeatures.py", line 327, in test_image_gen_pkgdbfs
    self.assertTrue(os.path.exists(os.path.join(img_vars['DEPLOY_DIR_IMAGE'], 'var/lib/opkg/status')), 'opkg\'s status file was not present in: %s' % tar_file)
  File "/usr/lib64/python3.9/unittest/case.py", line 688, in assertTrue
    raise self.failureException(msg)
AssertionError: False is not true : opkg's status file was not present in: /home/pokybuild/yocto-worker/oe-selftest-centos/build/build-st-3332915/tmp/deploy/images/qemux86-64/core-image-minimal-qemux86-64.rootfs-pkgdb.tar.gz


On 04/03/2024 07:15:50+0100, Johannes Schneider via lists.openembedded.org wrote:
> systemd-sysext allows to overlay another image (or multiple) ontop of
> a "base-image" = the current rootfs, via the use of overlayfs; to add
> tools and features meant for development purposes.
> 
> To quote the documentation on systemd-sysext:
> " ...addition in order to make debugging/development easier). System
> extension images should not be misunderstood as a generic software
> packaging framework, ..."
> 
> To build a lean image, that only holds packages that are not already
> part of the base-image, a snapshot of the package-database is taken
> after the installation of the base-rootfs is done, and picked up again
> when collecting the rootfs of such a extension image.
> 
> with all this in place an example usage could look like this:
> some-core-image.bb
>   inherit core-image
>   IMAGE_GEN_PKGDBFS = "1"
> 
> extending-image.bb
>   inherit image-sysext
>   IMAGE_FSTYPES = "squashfs"
>   IMAGE_BASE_PKGDB = "some-core-image"
>   # the above pointing at a package-db similar to:
>   # build/deploy/images/$MACHINE/some-core-image-$MACHINE-20240210172305-pkgdb.rootfs.tar.gz
> 
> then on the device, running some-core-image, with the extension image placed at FN:
> $> ln -s "$FN" /run/extensions/$(basename $FN).raw
> $> systemd-sysext list
> $> SYSTEMD_LOG_LEVEL=debug systemd-sysext merge
> 
> As long as the VERSION_ID of the extension image matches the os-release
> in the base image, the above commands return sucessfully;
> for details on the compativility check see the docs for systemd-sysext.
> 
> =========
> 
> changes with v2:
>         rebase from 'kirkstone' onto 'master'
> 
> changes with v3;
> 	incorporate review suggestions for simplification
> 	add task dependency handling
> 	add oe-selftest for the pkgdb handling
> 	add variable documentation and
> 	some more comments, and examples in the commit-msg
> 
> changes with v4;
> 	rebase onto 'master' => no functional changes
> 	fixed patchtest findings

> 
> -=-=-=-=-=-=-=-=-=-=-=-
> Links: You receive all messages sent to this group.
> View/Reply Online (#196588): https://lists.openembedded.org/g/openembedded-core/message/196588
> Mute This Topic: https://lists.openembedded.org/mt/104717642/3617179
> Group Owner: openembedded-core+owner@lists.openembedded.org
> Unsubscribe: https://lists.openembedded.org/g/openembedded-core/unsub [alexandre.belloni@bootlin.com]
> -=-=-=-=-=-=-=-=-=-=-=-
> 


-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Re: [OE-core] [PATCH v4 0/3] pkg-database and systemd-sysext image

[SCHNEIDER Johannes]

Hoi,


thanks for pointing the build failure out,

Im trying to reproduce it locally but fail so far to see the problem :-S
rebased on the latest master, when the two selftests added with the patches are run selecively, they pass:
#> oe-selftest -r imagefeatures.ImageFeatures.test_image_gen_pkgdbfs imagefeatures.ImageFeatures.test_image_use_pkgdbfs

but running the whole test-routine, same way the buildserver does in that log, currently fails me for other reasons (lack of resources? or i might be calling it the wrong way)

any hints/ideas/pointers would be appreciated :-)


gruß
Johannes

________________________________________
From: Alexandre Belloni <alexandre.belloni@bootlin.com>
Sent: Saturday, March 23, 2024 14:40
To: SCHNEIDER Johannes
Cc: openembedded-core@lists.openembedded.org; richard.purdie@linuxfoundation.org
Subject: Re: [OE-core] [PATCH v4 0/3] pkg-database and systemd-sysext image

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Hello,

The series causes failures on the autobuilders:

https://autobuilder.yoctoproject.org/typhoon/#/builders/79/builds/6548/steps/14/logs/stdio


2024-03-21 21:05:49,848 - oe-selftest - INFO - 6: 20/46 500/587 (137.73s) (0 failed) (imagefeatures.ImageFeatures.test_image_gen_pkgdbfs)
2024-03-21 21:05:49,848 - oe-selftest - INFO - testtools.testresult.real._StringException: Traceback (most recent call last):
  File "/home/pokybuild/yocto-worker/oe-selftest-centos/build/meta/lib/oeqa/selftest/cases/imagefeatures.py", line 327, in test_image_gen_pkgdbfs
    self.assertTrue(os.path.exists(os.path.join(img_vars['DEPLOY_DIR_IMAGE'], 'var/lib/opkg/status')), 'opkg\'s status file was not present in: %s' % tar_file)
  File "/usr/lib64/python3.9/unittest/case.py", line 688, in assertTrue
    raise self.failureException(msg)
AssertionError: False is not true : opkg's status file was not present in: /home/pokybuild/yocto-worker/oe-selftest-centos/build/build-st-3332915/tmp/deploy/images/qemux86-64/core-image-minimal-qemux86-64.rootfs-pkgdb.tar.gz


On 04/03/2024 07:15:50+0100, Johannes Schneider via lists.openembedded.org wrote:
> systemd-sysext allows to overlay another image (or multiple) ontop of
> a "base-image" = the current rootfs, via the use of overlayfs; to add
> tools and features meant for development purposes.
>
> To quote the documentation on systemd-sysext:
> " ...addition in order to make debugging/development easier). System
> extension images should not be misunderstood as a generic software
> packaging framework, ..."
>
> To build a lean image, that only holds packages that are not already
> part of the base-image, a snapshot of the package-database is taken
> after the installation of the base-rootfs is done, and picked up again
> when collecting the rootfs of such a extension image.
>
> with all this in place an example usage could look like this:
> some-core-image.bb
>   inherit core-image
>   IMAGE_GEN_PKGDBFS = "1"
>
> extending-image.bb
>   inherit image-sysext
>   IMAGE_FSTYPES = "squashfs"
>   IMAGE_BASE_PKGDB = "some-core-image"
>   # the above pointing at a package-db similar to:
>   # build/deploy/images/$MACHINE/some-core-image-$MACHINE-20240210172305-pkgdb.rootfs.tar.gz
>
> then on the device, running some-core-image, with the extension image placed at FN:
> $> ln -s "$FN" /run/extensions/$(basename $FN).raw
> $> systemd-sysext list
> $> SYSTEMD_LOG_LEVEL=debug systemd-sysext merge
>
> As long as the VERSION_ID of the extension image matches the os-release
> in the base image, the above commands return sucessfully;
> for details on the compativility check see the docs for systemd-sysext.
>
> =========
>
> changes with v2:
>         rebase from 'kirkstone' onto 'master'
>
> changes with v3;
>       incorporate review suggestions for simplification
>       add task dependency handling
>       add oe-selftest for the pkgdb handling
>       add variable documentation and
>       some more comments, and examples in the commit-msg
>
> changes with v4;
>       rebase onto 'master' => no functional changes
>       fixed patchtest findings

>
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--
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com/