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document ARCH_VARIANT and BUILD_TYPE in README.parameters

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michael.hudson@canonical.com 2026-02-12 10:27:54 +13:00
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README.parameters
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@ -46,6 +46,8 @@ These variables can be set for both lb config and lb build:
PROJECT (mandatory, comes from "project" in the metadata) PROJECT (mandatory, comes from "project" in the metadata)
ARCH (set to the abi tag of the distroarchseries being built for) ARCH (set to the abi tag of the distroarchseries being built for)
ARCH_VARIANT (set to the isa tag of the distroarchseries being built for if it is
different from the abi tag)
SUBPROJECT (optional, comes from "subproject" in the metadata) SUBPROJECT (optional, comes from "subproject" in the metadata)
SUBARCH (optional, comes from "subarch" in the metadata) SUBARCH (optional, comes from "subarch" in the metadata)
CHANNEL (optional, comes from "subarch" in the metadata) CHANNEL (optional, comes from "subarch" in the metadata)
@ -74,6 +76,8 @@ are some things set for lb config only? no idea):
"extra_ppas" is a list. EXTRA_PPAS is set to " ".join(extra_ppas)) "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 (optional, comes from "extra_snaps" in the metadata
"extra_snaps" is a list. EXTRA_SNAPS is set to " ".join(extra_snaps)) "extra_snaps" is a list. EXTRA_SNAPS is set to " ".join(extra_snaps))
BUILD_TYPE (optional, the "type" (i.e. Daily or Release) of ISO being built,
goes into .disk/info on the ISO, defaults to Daily)
Here is an opinionated and slightly angry attempt to describe what Here is an opinionated and slightly angry attempt to describe what
each of these is for: each of these is for:
@ -96,6 +100,14 @@ The architecture being built for. This is always the same as `dpkg
It's kind of redundant but it's not really a problem that this exists. It's kind of redundant but it's not really a problem that this exists.
ARCH_VARIANT
------------
The "variant" being built for, i.e. the ISA tag of the
distroarchseries. Only set if this is different from the ABI tag.
This is definitely needed to be able to build images for variants.
SUBPROJECT SUBPROJECT
---------- ----------
@ -234,3 +246,18 @@ EXTRA_SNAPS
----------- -----------
Extra snaps to include (but only for ubuntu-image based builds). Extra snaps to include (but only for ubuntu-image based builds).
BUILD_TYPE
----------
Before release, the .disk/info on an ISO looks like:
Ubuntu-Server 26.04 LTS "Resolute Raccoon" - Daily amd64 (20260210)
after release it looks like:
Ubuntu-Server 26.04 LTS "Resolute Raccoon" - Release amd64 (20270210)
We could do a livecd-rootfs upload to change this (it only changes
once per cycle), but it's quicker and easier to manage this from the
code that triggers the livefs builds.