Merge ~ack/ubuntu/+source/maas:snap-default-version into ubuntu/+source/maas:ubuntu/devel

[Alberto Donato]

set default snap track version to 2.7/stable if snapd doesn't support default tracks

04d5c4d... by Alberto Donato on 2020-02-25

rename function (Adam's review)

[Julian Andres Klode (juliank)]

This seems to have been superseded by newer approaches, so disapproving.

review: Disapprove

Unmerged commits

04d5c4d... by Alberto Donato on 2020-02-25

rename function (Adam's review)

150a9d8... by Alberto Donato on 2020-02-25

set default snap track version to 2.7/stable if snapd doesn't support default tracks

e5187af... by Alberto Donato on 2020-02-20

Import patches-unapplied version 1:0.2 to ubuntu/focal-proposed

Imported using git-ubuntu import.

Changelog parent: a029f174ab75946f2f82450abe170436983c7b8d

New changelog entries:
  * Fix dependencies to pre-depend on debconf and snapd
  * Fix project homepage URL to https

a029f17... by Alberto Donato on 2020-01-20

Import patches-unapplied version 1:0.1 to ubuntu/focal-proposed

Imported using git-ubuntu import.

diff --git a/debian/changelog b/debian/changelog
index 47bb023..a8faaf2 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+maas (1:0.3) focal; urgency=medium
+
+  * Set default snap version to 2.7 if default track support is not available in snapd
+
+ -- Alberto Donato <[e-mail]>  Tue, 25 Feb 2020 12:05:15 +0100
+
 maas (1:0.2) focal; urgency=medium
 
   * Fix dependencies to pre-depend on debconf and snapd
diff --git a/debian/maas.preinst b/debian/maas.preinst
index 15da5cd..7f40bdc 100755
--- a/debian/maas.preinst
+++ b/debian/maas.preinst
@@ -1,6 +1,7 @@
 #!/bin/bash -e
 
 DEFAULT_UBUNTU_RELEASE="20.04"
+DEFAULT_SNAP_VERSION="2.7"
 DEFAULT_SNAP_TRACK="stable"
 
 SNAP_COMMON="/var/snap/maas/common"
@@ -14,6 +15,15 @@ get_snap_mode() {
     cat "$SNAP_COMMON/snap_mode" 2>/dev/null || true
 }
 
+snapd_has_default_track_support() {
+    local version
+    version=$(snap version | awk '$1 == "snapd" { print $2; }')
+    local major="${version%%.*}"
+    local rest="${version#*.}"
+    local minor="${rest%%.*}"
+    [ "$major" -ge 2 ] && [ "$minor" -ge 44 ]
+}
+
 check_connectivity() {
     local count=0
     while true; do
@@ -60,7 +70,10 @@ install_snap() {
     db_go
     db_get maas/snap-track
     local track="$RET"
-    [ -n "${track}" ] || track="$DEFAULT_SNAP_TRACK"
+    if [ -z "$track" ]; then
+        track="$DEFAULT_SNAP_TRACK"
+        snapd_has_default_track_support || track="$DEFAULT_SNAP_VERSION/$track"
+    fi
 
     local release="$DEFAULT_UBUNTU_RELEASE"
     if [ -e "/etc/os-release" ]; then