Germinate cannot seed a package from "update" pocket

[Jean-Baptiste Lallement]

In LTSes some packages are in universe in the release pocket and in main in the update pocket.

For example in focal:

$ rmadison -s focal,focal-updates realmd adcli
 realmd | 0.16.3-3 | focal/universe | source, amd64, arm64, armhf, ppc64el, riscv64, s390x
 realmd | 0.16.3-3 | focal-updates | source, amd64, arm64, armhf, i386, ppc64el, riscv64, s390x
 adcli | 0.9.0-1 | focal/universe | source, amd64, arm64, armhf, ppc64el, riscv64, s390x
 adcli | 0.9.0-1 | focal-updates | i386
 adcli | 0.9.0-1ubuntu0.20.04.1 | focal-updates | source, amd64, arm64, armhf, ppc64el, riscv64, s390x

When these packages are seeded but they have no reverse dependencies, for instances seeded in the live seed and only main and restricted are considered (for Ubuntu) then these packages ignored (unknown) by germinate and not added to the live session.

Here is an excerpt from the build log of Focal Ubuntu Deskop (https://launchpadlibrarian.net/530408277/buildlog_ubuntu_focal_amd64_ubuntu_BUILDING.txt.gz)

Downloading http://ftpmaster.internal/ubuntu/dists/focal/main/binary-amd64/Packages.xz file ...
Decompressing http://ftpmaster.internal/ubuntu/dists/focal/main/binary-amd64/Packages.xz file ...
Downloading http://ftpmaster.internal/ubuntu/dists/focal/main/source/Sources.xz file ...
Decompressing http://ftpmaster.internal/ubuntu/dists/focal/main/source/Sources.xz file ...
Downloading http://ftpmaster.internal/ubuntu/dists/focal/restricted/binary-amd64/Packages.xz file ...
Decompressing http://ftpmaster.internal/ubuntu/dists/focal/restricted/binary-amd64/Packages.xz file ...
Downloading http://ftpmaster.internal/ubuntu/dists/focal/restricted/source/Sources.xz file ...
Decompressing http://ftpmaster.internal/ubuntu/dists/focal/restricted/source/Sources.xz file ...
* Downloading http://archive-team.internal/seeds/ubuntu.focal/STRUCTURE
[...]
! Duplicated seed: ntfs-3g
? Unknown live package: realmd
? Unknown live package: adcli
! Duplicated seed: dirmngr
[...]

From livecd-rootfs code there doesn't seem to be any option to pass the component to be considered by germinate:

in auto/config:
 (cd config/germinate-output && germinate --no-rdepends --no-installer \
                -S $SEEDMIRROR -m $MIRROR -d $SUITE -s $SEED \
                ${COMPONENTS:+-c "$COMPONENTS"} -a $ARCH)

[Jean-Baptiste Lallement (jibel)]

Closing this report as the initial diagnostic was oncorrect.