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Backport snap preseed base support (LP: #1874834)
Xenial builds with core18-based snaps pre-seed core snap instead core18 and snapd. This patch is a backport of snap pre-seeding functionality that is snap base aware.
This commit is contained in:
Robert C Jennings
parent
2738ffc1b3
commit
8789997c4b
6
debian/changelog
vendored
6
debian/changelog
vendored
@ -1,3 +1,9 @@
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livecd-rootfs (2.408.59) xenial; urgency=medium
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* Backport snap preseed base support (LP: #1874834)
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-- Robert C Jennings <robert.jennings@canonical.com> Fri, 24 Apr 2020 10:54:54 -0500
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livecd-rootfs (2.408.58) xenial; urgency=medium
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* Use a snap cohort key for consistent parallel builds (LP: #1866159)
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@ -349,6 +349,47 @@ release_ver() {
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distro-info --series="$LB_DISTRIBUTION" -r | awk '{ print $1 }'
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}
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_snap_post_process() {
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# Look for the 'core' snap. If it is not present, assume that the image
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# contains only snaps with bases >= core18. In that case snapd is
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# preseeded. However, when 'core' is being installed and snapd has not
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# been installed by a call to 'snap_preseed' (see below) then it is
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# removed again.
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local CHROOT_ROOT=$1
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local SNAP_NAME=$2
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local seed_dir="$CHROOT_ROOT/var/lib/snapd/seed"
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local snaps_dir="$seed_dir/snaps"
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local seed_yaml="$seed_dir/seed.yaml"
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local assertions_dir="$seed_dir/assertions"
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local snapd_install_stamp="$seed_dir/.snapd-explicit-install-stamp"
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case $SNAP_NAME in
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core[0-9]*)
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# If the 'core' snap is not present, assume we are coreXX-only and
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# install the snapd snap.
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if [ ! -f ${snaps_dir}/core_[0-9]*.snap ]; then
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_snap_preseed $CHROOT_ROOT snapd stable
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fi
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;;
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core)
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# If the snapd snap has been seeded, but not marked as explicitly
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# installed (see snap_preseed below), then remove it.
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if [ -f ${snaps_dir}/snapd_[0-9]*.snap ] && \
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[ ! -f "$snapd_install_stamp" ]
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then
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# Remove snap, assertions and entry in seed.yaml
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rm -f ${snaps_dir}/snapd_[0-9]*.snap
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rm -f ${assertions_dir}/snapd_[0-9]*.assert
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sed -i -e'N;/name: snapd/,+2d' $seed_yaml
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fi
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;;
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*)
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# ignore
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;;
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esac
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}
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_snap_preseed() {
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# Download the snap/assertion and add to the preseed
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local CHROOT_ROOT=$1
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@ -363,12 +404,18 @@ _snap_preseed() {
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# Download the snap & assertion
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local snap_download_failed=0
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chroot $CHROOT_ROOT sh -c "
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# Preseed a snap only once
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if [ -f ${snaps_dir}/${SNAP_NAME}_[0-9]*.snap ]; then
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return
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fi
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sh -c "
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set -x;
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cd /var/lib/snapd/seed;
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cd \"$CHROOT_ROOT/var/lib/snapd/seed\";
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SNAPPY_STORE_NO_CDN=1 snap download \
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--cohort="${COHORT_KEY:-}" \
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--channel=$CHANNEL \"$SNAP_NAME\"" || snap_download_failed=1
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--channel=\"$CHANNEL\" \"$SNAP_NAME\"" || snap_download_failed=1
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if [ $snap_download_failed = 1 ] ; then
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echo "If the channel ($CHANNEL) includes '*/ubuntu-##.##' track per "
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echo "Ubuntu policy (ex. stable/ubuntu-18.04) the publisher will need "
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@ -381,6 +428,35 @@ _snap_preseed() {
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mv -v $seed_dir/*.assert $assertions_dir
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mv -v $seed_dir/*.snap $snaps_dir
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# Pre-seed snap's base
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case $SNAP_NAME in
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snapd)
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# snapd is self-contained, ignore base
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;;
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core|core[0-9][0-9])
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# core and core## are self-contained, ignore base
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;;
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*)
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# Determine which core snap is needed
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local snap_info
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# snap info doesn't have --channel, so must run agains the downloaded snap
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snap_info=$(snap info --verbose ${snaps_dir}/${SNAP_NAME}_[0-9]*.snap)
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if [ $? -ne 0 ]; then
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echo "Failed to retrieve base of $SNAP_NAME!"
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exit 1
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fi
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local core_snap=$(echo "$snap_info" | grep '^base:' | awk '{print $2}')
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# If snap info does not list a base use 'core'
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core_snap=${core_snap:-core}
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_snap_preseed $CHROOT_ROOT $core_snap stable
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;;
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esac
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# Add the snap to the seed.yaml
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! [ -e $seed_yaml ] && echo "snaps:" > $seed_yaml
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cat <<EOF >> $seed_yaml
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@ -393,6 +469,8 @@ EOF
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echo -n " file: " >> $seed_yaml
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(cd $snaps_dir; ls -1 ${SNAP_NAME}_*.snap) >> $seed_yaml
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_snap_post_process $CHROOT_ROOT $SNAP_NAME
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}
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snap_prepare_assertions() {
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@ -444,25 +522,43 @@ snap_prepare() {
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# used for the image's model assertion
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local CUSTOM_BRAND_MODEL=${2:-generic:generic-classic}
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local seed_dir="$CHROOT_ROOT/var/lib/snapd/seed"
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local snaps_dir="$seed_dir/snaps"
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snap_prepare_assertions "$CHROOT_ROOT" "$CUSTOM_BRAND_MODEL"
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# Download the core snap
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if ! [ -f $snaps_dir/core_[0-9]*.snap ] ; then
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_snap_preseed $CHROOT_ROOT core stable
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fi
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}
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snap_preseed() {
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# Preseed a snap in the image
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local CHROOT_ROOT=$1
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local SNAP=$2
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local SNAP_NAME=${SNAP%/*}
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# Per Ubuntu policy, all seeded snaps (with the exception of the core
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# snap) must pull from stable/ubuntu-$(release_ver) as their channel.
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local CHANNEL=${3:-"stable/ubuntu-$(release_ver)"}
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snap_prepare $CHROOT_ROOT
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_snap_preseed $CHROOT_ROOT $SNAP $CHANNEL
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# Mark this image as having snapd installed explicitly.
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case $SNAP_NAME in
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snapd)
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touch "$CHROOT_ROOT/var/lib/snapd/seed/.snapd-explicit-install-stamp"
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;;
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esac
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# Do basic validation of generated snapd seed.yaml, doing it here
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# means we catch all the places(tm) that snaps are added but the
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# downside is that each time a snap is added the seed must be valid,
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# i.e. snaps with bases need to add bases first etc
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#
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# Skip validation by setting SNAP_NO_VALIDATE_SEED=1.
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if [ -z "${SNAP_NO_VALIDATE_SEED:-}" ]; then
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snap_validate_seed "${CHROOT_ROOT}"
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fi
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}
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snap_validate_seed() {
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local CHROOT_ROOT=$1
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if [ -e "${CHROOT_ROOT}/var/lib/snapd/seed/seed.yaml" ]; then
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snap debug validate-seed "${CHROOT_ROOT}/var/lib/snapd/seed/seed.yaml"
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fi
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}
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