releasing package livecd-rootfs version 26.04.12

Signed-off-by: Olivier Gayot <olivier.gayot@canonical.com>

README.parameters

@@ -0,0 +1,236 @@
+Understanding the parameters used by livecd-rootfs
+==================================================
+
+livecd-rootfs is a confusing codebase. One of the confusing things is
+how information flows into and around the image build process. There
+is IMAGEFORMAT and IMAGE_TARGETS and PROJECT and many other
+variables. It is not obvious when looking at the code if a given
+variable is something passed as a parameter or something derived from
+it.
+
+All (or almost all) production use of livecd-rootfs is via
+launchpad-buildd so the set of potential parameters is limited by the
+set of environment variables launchpad-build can set in response to
+the build request.
+
+The process from build request to environment live-build is run is a
+little convoluted. The build request takes:
+
+ an archive -- where to get livecd-rootfs from
+ a distro_arch_series -- the series to get livecd-rootfs and build
+ a pocket -- pocket to get livecd-rootfs from, also influences if proposed is
+             used as a package source for the image being built
+ unique_key -- you cannot have more than one pending livefs build with the same
+               unique_key. does not affect the build at all.
+ version -- optional version string, see below. often a serial like 20250525.1
+ metadata_override -- combined with the metadata on the livefs itself to make
+                      the metadata for this build.
+
+(ref: https://launchpad.net/+apidoc/devel.html#livefs-requestBuild)
+
+These parameters are stored on the livefsbuild object (ref:
+https://git.launchpad.net/launchpad/tree/lib/lp/soyuz/model/livefsbuild.py#n372)
+and converted into a set of args passed to launchpad-build by the
+LiveFSBuildBehaviour class (ref:
+https://git.launchpad.net/launchpad/tree/lib/lp/soyuz/model/livefsbuildbehaviour.py#n99).
+
+Inside launchpad-build, these arguments are inspected by the
+LiveFilesystemBuildManager.initiate method (ref:
+https://git.launchpad.net/launchpad-buildd/tree/lpbuildd/livefs.py#n24)
+which turns them into arguments for the BuildLiveFS lpbuild
+"operation" which is what creates the environment live-build runs in
+(ref:
+https://git.launchpad.net/launchpad-buildd/tree/lpbuildd/target/build_livefs.py#n167).
+
+These variables can be set for both lb config and lb build:
+
+ PROJECT       (mandatory, comes from "project" in the metadata)
+ ARCH          (set to the abi tag of the distroarchseries being built for)
+ SUBPROJECT    (optional, comes from "subproject" in the metadata)
+ SUBARCH       (optional, comes from "subarch" in the metadata)
+ CHANNEL       (optional, comes from "subarch" in the metadata)
+ IMAGE_TARGETS (optional, comes from "image_targets" in the metadata
+                "image_targets" is a list. IMAGE_TARGETS is set to " ".join(image_targets))
+ REPO_SNAPSHOT_STAMP
+               (optional, comes from "repo_snapshot_stamp" in the metadata)
+ SNAPSHOT_SERVICE_TIMESTAMP
+               (optional, comes from "snapshot_snapshot_stamp" in the metadata)
+ COHORT_KEY
+               (optional, comes from "cohort-key" in the metadata)
+
+launchpad-buildd also contains code to set http_proxy / HTTP_PROXY /
+LB_APT_HTTP_PROXY but there does not appear to be any way to trigger
+this when requesting a build.
+
+In addition the following variables can be set for lb config only (why
+are some things set for lb config only? no idea):
+
+ SUITE         (set to the name of the distroarchseries being built for)
+ NOW           (set to value of the 'version' argument to the build request,
+                defaults to strftime("%Y%m%d-%H%M%S"))
+ IMAGEFORMAT   (optional, comes from "image_format" in the metadata)
+ PROPOSED      (set to "1" if the pocket passed to the build request is proposed)
+ EXTRA_PPAS    (optional, comes from "extra_ppas" in the metadata
+                "extra_ppas" is a list. EXTRA_PPAS is set to " ".join(extra_ppas))
+ EXTRA_SNAPS   (optional, comes from "extra_snaps" in the metadata
+                "extra_snaps" is a list. EXTRA_SNAPS is set to " ".join(extra_snaps))
+
+Here is an opinionated and slightly angry attempt to describe what
+each of these is for:
+
+PROJECT
+-------
+
+This is the big one, the main variable that defines what is being
+built. It can be ubuntu, ubuntu-server, xubuntu, ubuntu-mini-iso, that
+sort of thing. Generally PROJECT determines the set of packages
+installed but it (unfortunately?) has a bit more impact than that.
+
+It's unarguable that we need a parameter like this.
+
+ARCH
+----
+
+The architecture being built for. This is always the same as `dpkg
+--print-architecture` for us, we don't do any cross builds.
+
+It's kind of redundant but it's not really a problem that this exists.
+
+SUBPROJECT
+----------
+
+This is used for some builds to build a different sort of build of the
+project. It can be set to:
+
+ * "minimized" for ubuntu-cpc builds to make a minimal cloud image
+ * "minimal" for xubuntu builds to make a smaller ISO
+ * "desktop-preinstalled" for ubuntu builds to make a preinstalled
+   image instead of the parts for an installer.
+ * "buildd" for images to be used as build images by craft tools, and also
+   buildd chroots used on launchpad builders?
+ * "live" for ubuntu-server builds, historically to distinguish d-i
+   style installers from subiquity style installers
+ * "desktop" for ubuntu-core-installer builds, to influence which
+   model is use to build the ubuntu core system that will be
+   installed.
+
+_This_ parameter is a total mess. The desktop-preinstalled use feels
+particularly egregious.
+
+SUBARCH
+-------
+
+This identifies the target machine more specifically than ARCH,
+e.g. "tegra-jetson" or "licheerv". Used mostly but not exclusively for
+preinstalled builds.
+
+We probably do need something like this.
+
+CHANNEL
+-------
+
+Influences which channel snaps included in the build are taken from
+(via a few different mechanisms).
+
+IMAGE_TARGETS
+-------------
+
+Passed for CPC (and ubuntu-oem, for some reason) builds to
+`config/hooks.d/make-hooks` which uses it to select which binary hooks
+to run (and so determines which artifacts get produced).
+
+It is probably reasonable that this exists.
+
+REPO_SNAPSHOT_STAMP
+-------------------
+
+Currently unused.
+
+SNAPSHOT_SERVICE_TIMESTAMP
+--------------------------
+
+Also currently unused, and unclear how it differs from
+REPO_SNAPSHOT_STAMP.
+
+COHORT_KEY
+----------
+
+Used to make sure that different builds run at the same time don't get
+different versions of snaps due to phasing differences.
+
+This is a totally valid thing to need to supply.
+
+http_proxy / HTTP_PROXY / LB_APT_HTTP_PROXY
+-------------------------------------------
+
+Nothing complex here!
+
+SUITE
+-----
+
+This is the series being built (e.g. noble, questing). It is misnamed
+really -- a suite is usually a combination of a series and a pocket
+(noble-proposed, questing-security).
+
+As with ARCH this is sort of redundant as we do builds in a chroot of
+the series being built but OTOH it is definitely information the
+build needs to know!
+
+NOW
+---
+
+The serial for the build, e.g. 20250519 or 20240418.4.
+
+It is a totally reasonable parameter.
+
+IMAGEFORMAT
+-----------
+
+This is one of the more incoherently handled parameters. In rough
+outline it is the filesystem of the image we produce.
+
+Installer builds do not produce raw images, so this ends up being set
+to 'plain' (which causes live-build to just leave the rootfs as a
+directory tree) or 'none' (which causes live-build to do roughly the
+same thing but in a different way?).
+
+Image builds that use ubuntu-image set it to "ubuntu-image". These
+builds do not call 'lb build' or 'lb binary'.
+
+Other preinstalled images (mostly cpc images) set it to ext4 (but then
+use live-build/ubuntu-cpc/hooks.d/remove-implicit-artifacts to remove
+the output file that this causes live-build to produce...). Some
+projects rely on this being set via metadata when building the project
+it seems.
+
+It can be set when starting an image build, but most builds do not and
+the behavior when it is not set explicitly is pretty confusing.
+
+This place is not a place of honor.
+
+PROPOSED
+--------
+
+Should packages from proposed by included?
+
+This is not really as useful as it used to be for a bunch of reasons
+but it conceptually makes sense.
+
+EXTRA_PPAS
+----------
+
+Extra archives to get packages from.
+
+This is a space separated list by the time it gets to
+livecd-rootfs. Each element of the list is of the form USER/NAME[:PIN]
+where user is a Launchpad user/team name, NAME is the name of the ppa
+to add and the optional colon-PIN at the end is the value to pin (in
+the "man 5 apt_preferences: sense) packages from this PPA at.
+
+Production builds shouldn't really use this but it's definitely useful
+for development.
+
+EXTRA_SNAPS
+-----------
+
+Extra snaps to include (but only for ubuntu-image based builds).

debian/changelog

@@ -1,3 +1,47 @@
+livecd-rootfs (26.04.12) resolute; urgency=medium
+
+  * desktop: add variables pointing to the different models (stable & dangerous).
+  * desktop: fix snap components taken from original model when overriding a
+    snap with another model.
+    - if we decide to override the definition of a snap (i.e., by taking in
+      from a different model), we also need to override the definition of its
+      components.
+  * desktop: refactor how we filter the snaps when overriding
+  * desktop: update the dangerous model so that it includes core26 and the 6.17
+    kernel and components.
+
+ -- Olivier Gayot <olivier.gayot@canonical.com>  Tue, 16 Dec 2025 14:54:17 +0100
+
+livecd-rootfs (26.04.11) resolute; urgency=medium
+
+  [ Valentin Haudiquet ]
+  * refactor: added a function to generate grub config for netboot
+  * riscv/server: add grub efi bootloader in netboot tarballs
+
+  [ Olivier Gayot ]
+  * desktop: build with optional components included
+  * desktop: don't build the stable image with pc-kernel from 26.04/beta
+    - This was needed before because there was pc-kernel in 26.04/stable but
+      now there is one and it matches the components definition from the model.
+
+ -- Valentin Haudiquet <valentin.haudiquet@canonical.com>  Thu, 11 Dec 2025 09:28:37 +0100
+
+livecd-rootfs (26.04.10) resolute; urgency=medium
+
+  [ Olivier Gayot ]
+  * desktop: fix a comment typo
+
+  [ Michael Hudson-Doyle ]
+  * Build Ubuntu Server images with the 'restricted' component enabled.
+
+ -- Dan Bungert <daniel.bungert@canonical.com>  Tue, 09 Dec 2025 21:07:54 +1300
+
+livecd-rootfs (26.04.9) resolute; urgency=medium
+
+  * desktop: Add mesa to the hybrid model required by core24 apps.
+
+ -- Didier Roche-Tolomelli <didrocks@ubuntu.com>  Wed, 26 Nov 2025 08:51:24 +0100
+
 livecd-rootfs (26.04.8) resolute; urgency=medium
 
   * desktop: update TPM/FDE ubuntu model to use a GNOME platform snap

live-build/auto/config

@@ -636,7 +636,7 @@ case $PROJECT in
 esac
 
 case $PROJECT in
-	ubuntu-server|ubuntu-mini-iso)
+	ubuntu-mini-iso)
 		COMPONENTS='main'
 		;;
 	edubuntu|ubuntu-budgie|ubuntucinnamon|ubuntukylin)
@@ -1097,6 +1097,9 @@ case $PROJECT in
 					arm64)
 						add_package ubuntu-server-minimal.ubuntu-server.installer.$flavor.netboot shim-signed
 						;;
+					riscv64)
+						add_package ubuntu-server-minimal.ubuntu-server.installer.$flavor.netboot grub-efi-riscv64 grub-efi-riscv64-unsigned
+						;;
 					*)
 						add_package ubuntu-server-minimal.ubuntu-server.installer.$flavor.netboot
 						;;

live-build/ubuntu-server/hooks/05-netboot-tarball.binary

@@ -1,5 +1,18 @@
 #!/bin/sh
 
+generate_grub_config ()
+{
+    # Generate the grub config file for netboot tarballs
+    # $1 Generated file path
+    cat > "${1}" <<EOF
+menuentry "Install Ubuntu Server" {
+        set gfxpayload=keep
+        linux   linux iso-url=#ISOURL# ip=dhcp ---
+        initrd  initrd
+}
+EOF
+}
+
 case $PASS in
     ubuntu-server-minimal.ubuntu-server.installer.generic*.netboot)
         ;;
@@ -46,13 +59,7 @@ case $ARCH in
         mv chroot/usr/lib/grub/x86_64-efi-signed/grubnetx64.efi.signed tarball/amd64/grubx64.efi
 
         mkdir tarball/amd64/grub tarball/amd64/pxelinux.cfg
-        cat > tarball/amd64/grub/grub.cfg.in <<EOF
-menuentry "Install Ubuntu Server" {
-        set gfxpayload=keep
-        linux   linux iso-url=#ISOURL# ip=dhcp ---
-        initrd  initrd
-}
-EOF
+        generate_grub_config tarball/amd64/grub/grub.cfg.in
         cat > tarball/amd64/pxelinux.cfg/default.in <<EOF
 DEFAULT install
 LABEL install
@@ -72,13 +79,7 @@ EOF
         mv chroot/usr/lib/grub/arm64-efi-signed/grubnetaa64.efi.signed tarball/arm64/grubaa64.efi
 
         mkdir tarball/arm64/grub
-        cat > tarball/arm64/grub/grub.cfg.in <<EOF
-menuentry "Install Ubuntu Server" {
-        set gfxpayload=keep
-        linux   linux iso-url=#ISOURL# ip=dhcp ---
-        initrd  initrd
-}
-EOF
+        generate_grub_config tarball/arm64/grub/grub.cfg.in
         ;;
 
     s390x)
@@ -125,6 +126,13 @@ LABEL install
   append=ip=dhcp iso-url=#ISOURL# ---
 EOF
         ;;
+
+    riscv64)
+        mv chroot/usr/lib/grub/riscv64-efi/monolithic/grubnetriscv64.efi tarball/riscv64/grubriscv64.efi
+
+        mkdir tarball/riscv64/grub
+        generate_grub_config tarball/riscv64/grub/grub.cfg.in
+        ;;
 esac
 
 tar -C tarball -czf livecd.${PROJECT}.netboot.tar.gz .

live-build/ubuntu/hooks/030-ubuntu-live-system-seed.binary

@@ -31,15 +31,82 @@ json.dump(yaml.safe_load(sys.stdin), sys.stdout, default=str)
 
 
 # Use jq to retrieve a list of --snap options from a given *signed* model.
-get_snaps_args()
+get_snaps_args_excluding()
 {
-    model=$1
+    local model=$1
+    local jq_filter='
+# Find all snaps that are not filtered out.
+# The filtered out snaps are passed as positional arguments so they end up in
+# the $ARGS.positional array.
+.snaps[] | select(.name | IN($ARGS.positional[]) | not)
+# Then forge the --snap option.
+ | "--snap=" + .name + "=" + .["default-channel"]'
+
+    shift
 
     # The model is signed and is not valid YAML unless we get rid of the
     # signature. Here we assume the only blank line is before the signature.
     sed '/^$/,$d' -- "$model" \
      | yaml_to_json \
-     | jq --raw-output '.snaps[] | "--snap=" + .name + "=" + .["default-channel"]'
+     | jq --raw-output "$jq_filter" --args "$@"
+}
+
+# Use jq to retrieve a list of --snap options from a given *signed* model.
+get_snaps_args()
+{
+    local model=$1
+    get_snaps_args_excluding "$model"
+}
+
+_get_components_filtered()
+{
+    local excluded=$1
+    local model=$2
+    local jq_filter='
+# Find all snaps that are either filtered in or filtered out
+# The filtered in (or out) snaps are passed as positional arguments so they end up in
+# the $ARGS.positional array.  The excluded variable is passed separately and
+# tells if we want to filter in (i.e., excluded=false) or filter out (i.e.,
+# excluded=true).
+ .snaps[] | select(.name | IN($ARGS.positional[]) | if $excluded then not else . end)
+# and have components
+ | select(.components)
+# Then save the name of each snap in a variable
+ | .name as $snap
+# Then for each entry that has "optional"
+ | .components | to_entries | map(select(.value.presence == "optional"))
+# Output its name with the snap name prepended
+ | "\($snap)" + "+" + .[].key'
+
+    shift 2
+
+    sed '/^$/,$d' -- "$model" \
+     | yaml_to_json \
+     | jq --raw-output "$jq_filter" --argjson excluded "$excluded" --args "$@"
+}
+
+# Get list of all components for all snaps
+get_all_components()
+{
+    local model=$1
+    # Provide an exclusion list but empty
+    _get_components_filtered true "$model"
+}
+
+# Get list of all components for all snaps except the ones specified.
+get_components_excluding()
+{
+    local model=$1
+    shift
+    _get_components_filtered true "$model" "$@"
+}
+
+# Get list of all components for the snaps specified.
+get_components()
+{
+    local model=$1
+    shift
+    _get_components_filtered false "$model" "$@"
 }
 
 # Generation of the model:
@@ -59,38 +126,56 @@ get_snaps_args()
 
 # env SNAPPY_STORE_NO_CDN=1 snap known --remote model series=16 brand-id=canonical model=ubuntu-classic-2410-amd64 > config/classic-model.model
 #
-# model=/usr/share/livecd-rootfs/live-build/${PROJECT}/ubuntu-classic-amd64.model
-# Normally we use the non-dangerous model here.  Use the dangerous one for now
-# until we get snaps on stable 26.04 tracks and channels.
-model=/usr/share/livecd-rootfs/live-build/${PROJECT}/ubuntu-classic-amd64-dangerous.model
+dangerous_model=/usr/share/livecd-rootfs/live-build/${PROJECT}/ubuntu-classic-amd64-dangerous.model
+stable_model=/usr/share/livecd-rootfs/live-build/${PROJECT}/ubuntu-classic-amd64.model
 
 prepare_args=()
 
+components=()
+
 # for the dangerous subproject, we need the dangerous model!
 if [ "$SUBPROJECT" = "dangerous" ]; then
     # As with the "classically" seeded snaps, snaps from the edge channel may
     # require different content snaps to be installed, so they must be
     # included in the system as well. We just use the same list as was
     # computed in snap_validate_seed.
-    model=/usr/share/livecd-rootfs/live-build/${PROJECT}/ubuntu-classic-amd64-dangerous.model
+    model="${dangerous_model}"
     while read snap; do
         prepare_args+=("--snap=${snap}=edge")
     done < config/missing-providers
+
+    for comp in $(get_all_components "$model"); do
+        components+=("$comp")
+    done
 else
-    # We're currently using the dangerous model for the non-dangerous ISO
-    # because it allows us to override snaps. But we don't want all snaps from
-    # edge like the dangerous model has, we want most of them from stable
-    # excluding:
-    # * pc-kernel - which currently does not exist on stable
+    # Normally we use the stable model here.  Use the dangerous one for now
+    # until we get snaps on stable 26.04 tracks and channels.
+    #model="${stable_model}"
+    model="${dangerous_model}"
+    # We're currently using the dangerous model for the stable image because it
+    # allows us to override snaps. But we don't want all snaps from edge like
+    # the dangerous model has, we want most of them from stable excluding:
     # * snapd (for TPM/FDE)
+    # * snapd-desktop-integration (for TPM/FDE)
     # * firmware-updater (for TPM/FDE)
-    # * desktop-security-center-center (for TPM/FDE)
-    while read -r snap_arg; do
+    # * desktop-security-center (for TPM/FDE)
+    snaps_from_dangerous=(snapd snapd-desktop-integration firmware-updater desktop-security-center)
+    for snap_arg in $(get_snaps_args_excluding "$stable_model" "${snaps_from_dangerous[@]}"); do
         prepare_args+=("$snap_arg")
-    done < <(get_snaps_args /usr/share/livecd-rootfs/live-build/"${PROJECT}"/ubuntu-classic-amd64.model \
-    | grep -v -F -e pc-kernel -e snapd -e firmware-updater -e desktop-security-center)
+    done
+
+    for comp in $(get_components_excluding "$stable_model" "${snaps_from_dangerous[@]}"); do
+        components+=("$comp")
+    done
+    for comp in $(get_components "$dangerous_model" "${snaps_from_dangerous[@]}"); do
+        components+=("$comp")
+    done
 fi
 
+for comp in "${components[@]}"; do
+    prepare_args+=(--comp "$comp")
+done
+
 channel=""
 if [ -n "${CHANNEL:-}" ]; then
     channel="--channel $CHANNEL"

live-build/ubuntu/ubuntu-classic-amd64-dangerous.model

@@ -16,13 +16,9 @@ snaps:
     type: gadget
   -
     components:
-      nvidia-550-erd-ko:
+      nvidia-580-uda-ko:
         presence: optional
-      nvidia-550-erd-user:
-        presence: optional
-      nvidia-570-erd-ko:
-        presence: optional
-      nvidia-570-erd-user:
+      nvidia-580-uda-user:
         presence: optional
     default-channel: 26.04/beta
     id: pYVQrBcKmBa0mZ4CCN7ExT6jH8rY1hza
@@ -38,6 +34,11 @@ snaps:
     id: dwTAh7MZZ01zyriOZErqd1JynQLiOGvM
     name: core24
     type: base
+  -
+    default-channel: latest/edge
+    id: cUqM61hRuZAJYmIS898Ux66VY61gBbZf
+    name: core26
+    type: base
   -
     default-channel: latest/edge
     id: PMrrV4ml8uWuEUDBT8dSGnKUYbevVhc4
@@ -48,6 +49,11 @@ snaps:
     id: EISPgh06mRh1vordZY9OZ34QHdd7OrdR
     name: bare
     type: base
+  -
+    default-channel: latest/edge
+    id: HyhSEBPv3vHsW6uOHkQR384NgI7S6zpj
+    name: mesa-2404
+    type: app
   -
     default-channel: 1/edge
     id: EI0D1KHjP8XiwMZKqSjuh6W8zvcowUVP
@@ -88,16 +94,16 @@ snaps:
     id: IrwRHakqtzhFRHJOOPxKVPU0Kk7Erhcu
     name: snapd-desktop-integration
     type: app
-timestamp: 2025-11-06T12:00:00.0Z
+timestamp: 2025-12-09T12:00:00.0Z
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live-build/ubuntu/ubuntu-classic-amd64.model

@@ -48,6 +48,11 @@ snaps:
     id: EISPgh06mRh1vordZY9OZ34QHdd7OrdR
     name: bare
     type: base
+  -
+    default-channel: latest/stable/ubuntu-26.04
+    id: HyhSEBPv3vHsW6uOHkQR384NgI7S6zpj
+    name: mesa-2404
+    type: app
   -
     default-channel: 1/stable/ubuntu-26.04
     id: EI0D1KHjP8XiwMZKqSjuh6W8zvcowUVP
@@ -91,13 +96,13 @@ snaps:
 timestamp: 2025-11-06T12:00:00.0Z
 sign-key-sha3-384: 9tydnLa6MTJ-jaQTFUXEwHl1yRx7ZS4K5cyFDhYDcPzhS7uyEkDxdUjg9g08BtNn
 
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