Add new 'source manifest' output

This outputs a list of **source** packages used in the image. This is
needed for GLVD. The list does not contain version numbers, and is
de-duplicated, so if one source package is used to create multiple
binary packages in the image, it will appear only once.

See gardenlinux/glvd#189 for more details

Author: fwilhe

builder/Makefile

@@ -106,5 +106,5 @@ $(foreach artifact_rule,$(shell ./make_get_artifact_rules),$(eval $(call artifac
 	ln -f -s -r '$<' '.build/$*'
 
 # prevents match anything rule from applying to Makefile and image/convert scripts
-Makefile image image.release image.manifest image.requirements $(shell find features -name 'convert.*' -o -name image -o -name 'image.*'):
+Makefile image image.release image.manifest image.sourcemanifest image.requirements $(shell find features -name 'convert.*' -o -name image -o -name 'image.*'):
 	true

builder/image.sourcemanifest

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+set -eufo pipefail
+
+chroot_dir="$(mktemp -d)"
+mount -t tmpfs tmpfs "$chroot_dir"
+tar --extract --xattrs --xattrs-include '*' --directory "$chroot_dir" < "$1"
+
+mount --rbind --make-rslave /proc "$chroot_dir/proc"
+
+#shellcheck disable=SC2016
+chroot "$chroot_dir" dpkg-query --show --showformat='${source:Package}\n' | sort | uniq > "$2"
+
+umount -l "$chroot_dir/proc"
+
+umount "$chroot_dir"
+rmdir "$chroot_dir"

builder/make_get_artifact_rules

@@ -3,7 +3,7 @@
 set -euo pipefail
 shopt -s nullglob
 
-extensions=(release manifest requirements raw)
+extensions=(release manifest sourcemanifest requirements raw)
 
 for feature in "features/"*; do
 	for i in "$feature/"{image,convert}.*; do

builder/make_list_build_artifacts

@@ -7,7 +7,7 @@ cname="$1"
 
 IFS=',' read -r -a features < <(./parse_features --allow-frankenstein --feature-dir features --cname "$cname" features)
 
-artifacts=(".build/$cname-$COMMIT.tar" ".build/$cname-$COMMIT.release" ".build/$cname-$COMMIT.manifest" ".build/$cname-$COMMIT.requirements")
+artifacts=(".build/$cname-$COMMIT.tar" ".build/$cname-$COMMIT.release" ".build/$cname-$COMMIT.manifest" ".build/$cname-$COMMIT.sourcemanifest" ".build/$cname-$COMMIT.requirements")
 
 for feature in "${features[@]}"; do
 	for i in "features/$feature/"{image,convert}.*; do