Generate snap list from task

live-build/functions

@@ -556,11 +556,39 @@ snap_from_seed() {
     fi
 }
 
+seed_from_task ()
+{
+    # Retrieve the name of the seed from a task name
+    local task=$1
+    local seed
+    local seedfile
+    local seedfiles
+
+    seedfile="$(grep -lE "^Task-Key: +${task}\$" config/germinate-output/*seedtext|head -1)"
+    if [ -n "$seedfile" ]; then
+        basename $seedfile .seedtext
+        return
+    fi
+
+    seedfiles="$(grep -lE "^Task-Per-Derivative: *1\$" config/germinate-output/*seedtext)"
+    if [ -n "$seedfiles" ]; then
+        for seed in $(echo $seedfiles | xargs basename -s .seedtext); do
+            if [ ${PROJECT}-${seed} = $task ]; then
+                echo ${seed}
+                return
+            fi
+        done
+    fi
+}
+
 add_task ()
 {
 	local pass="$1"
 	shift
 	local task
+	local snap_list_file
+	local snap_list_files
+	local curseed
 
 	# The removal of direct task installation support from live-build
 	# poses some problems.  If the chroot has multiarch configured - for
@@ -577,12 +605,32 @@ add_task ()
 	# probably a lurking timebomb that we need to fix.  In the meantime,
 	# the Architecture restriction at least saves us from abject
 	# failure.
+	#
+	# We want as well to grab the snap list for each PASS. Resolve for all
+	# given task, and deduplicate them to generate snaps for the PASS.
 
 	for task; do
 		# We need a ridiculous number of backslashes to protect
 		# parentheses from eval.
 		echo "!chroot chroot apt-cache dumpavail | grep-dctrl -nsPackage \\\\\\( -XFArchitecture $ARCH -o -XFArchitecture all \\\\\\) -a -wFTask $task" >> "config/package-lists/livecd-rootfs.list.chroot_$pass"
+
+		curseed=$(seed_from_task ${task})
+		if [ -z "${curseed}" ]; then
+			echo "W: No seed matching task ${task}"
+			continue
+		fi
+		snap_list_file="config/package-lists/seed.${curseed}.snaplist.full"
+		snap_from_seed "${curseed}" $snap_list_file
+		if [ -e "$snap_list_file" ]; then
+			snap_list_files="${snap_list_files} $snap_list_file"
+		fi
 	done
+	# The snap list is one line, and could be duplicated between seeds via inheritance.
+	# Uniquely sort them and store them back in one line.
+	if [ -n "${snap_list_files}" ]; then
+		cat ${snap_list_files}|xargs -n1|sort -u > "config/package-lists/livecd-rootfs.snaplist.chroot_${pass}.full"
+		rm ${snap_list_files}
+	fi
 }
 
 add_package ()