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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

(cherry picked from commit 7bae9201d20822d6875bcf5949e1fff839b8774c)
(cherry picked from commit 2976a99f292c500f39aace25ad08de21b37d7b31)
(cherry picked from commit d542e8e4a08467ef9b6237b9fcbd9166c8c99e8b)
This commit is contained in:
Dimitri John Ledkov 2020-05-27 17:10:24 +01:00
parent e39a40e2a5
commit 896b5962db
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GPG Key ID: 9B8EC849D5EF70ED
1 changed files with 23 additions and 3 deletions
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26
live-build/functions
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@ -626,11 +626,31 @@ 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=$2
# strip CHANNEL specification
SNAP=${SNAP%=*}
# strip /classic confinement
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)"}
# 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
# At this point:
# SNAP_NAME is just the snap name
# SNAP is either $SNAP_NAME or $SNAP_NAME/classic for classic confined
# CHANNEL is the channel
if [ ! -e "$CHROOT_ROOT/var/lib/snapd/seed/assertions/model" ]; then
echo "ERROR: Snap model assertion not present, snap_prepare must be called"