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snap_preseed: support channel specification with snap name

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snap_name[/classic]=track/risk/branch is now the supported snap name
specification, which allows to specify the full default track and
optional classic confinemnt.

Supporting such specification in the seedtext allows one to specify a
better default channel. For example, this will allow lxd to switch
from latest/stable/ubuntu-20.04 to 4.0/stable/ubuntu-20.04 as 4.0 is
the LTS track matching 20.04 support timeframe.

LP: #1882374
This commit is contained in:
Dimitri John Ledkov 2020-05-27 17:10:24 +01:00
parent 40103430d8
commit 7bae9201d2
1 changed files with 19 additions and 4 deletions
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23
live-build/functions
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@ -620,11 +620,26 @@ snap_prepare() {
snap_preseed() {
# Preseed a snap in the image (snap_prepare must be called once prior)
local CHROOT_ROOT=$1
# $2 can be in the form of snap_name/classic=track/risk/branch
local SNAP=$2
local SNAP_NAME=${SNAP%/*}
# Per Ubuntu policy, all seeded snaps (with the exception of the core
# snap) must pull from stable/ubuntu-$(release_ver) as their channel.
local CHANNEL=${3:-"stable/ubuntu-$(release_ver)"}
# strip CHANNEL specification
local SNAP_NAME=${SNAP%=*}
# strip /classic confinement
SNAP_NAME=${SNAP_NAME%/*}
# Seed from the specified channel (e.g. core18 latest/stable)
# Or Channel endcoded in the snap name (e.g. lxd=4.0/stable/ubuntu-20.04)
# Or Ubuntu policy default channel latest/stable/ubuntu-$(release_ver)
local CHANNEL=$3
if [ -z "$CHANNEL" ]; then
case $2 in
*=*)
CHANNEL=${2#*=}
;;
*)
CHANNEL="stable/ubuntu-$(release_ver)"
;;
esac
fi
if [ ! -e "$CHROOT_ROOT/var/lib/snapd/seed/assertions/model" ]; then
echo "ERROR: Snap model assertion not present, snap_prepare must be called"