Rebuild webpack during RPM build

This is necessary to comply with Fedora's packaging policy:
https://docs.fedoraproject.org/en-US/packaging-guidelines/JavaScript/

Include the node cache in the source rpm, unpack it into the main source
dir, and force a webpack rebuild in `%build`.

Makefile

@@ -100,7 +100,7 @@ $(NODE_CACHE): $(NODE_MODULES_TEST)
 
 node-cache: $(NODE_CACHE)
 
-srpm: $(TARFILE) cockpit-$(PACKAGE_NAME).spec
+srpm: $(TARFILE) $(NODE_CACHE) cockpit-$(PACKAGE_NAME).spec
 	rpmbuild -bs \
 	  --define "_sourcedir `pwd`" \
 	  --define "_srcrpmdir `pwd`" \
@@ -108,7 +108,7 @@ srpm: $(TARFILE) cockpit-$(PACKAGE_NAME).spec
 
 rpm: $(RPMFILE)
 
-$(RPMFILE): $(TARFILE) cockpit-$(PACKAGE_NAME).spec
+$(RPMFILE): $(TARFILE) $(NODE_CACHE) cockpit-$(PACKAGE_NAME).spec
 	mkdir -p "`pwd`/output"
 	mkdir -p "`pwd`/rpmbuild"
 	rpmbuild -bb \

cockpit-starter-kit.spec.in

@@ -4,8 +4,10 @@ Release: 1%{?dist}
 Summary: Cockpit Starter Kit Example Module
 License: LGPLv2+
 
-Source: cockpit-starter-kit-%{version}.tar.xz
+Source0: https://github.com/cockpit-project/starter-kit/releases/download/%{version}/cockpit-starter-kit-%{version}.tar.xz
+Source1: https://github.com/cockpit-project/starter-kit/releases/download/%{version}/cockpit-starter-kit-node-%{version}.tar.xz
 BuildArch: noarch
+BuildRequires:  nodejs
 BuildRequires: make
 BuildRequires: libappstream-glib
 
@@ -17,7 +19,13 @@ Requires: cockpit-system
 Cockpit Starter Kit Example Module
 
 %prep
-%setup -n cockpit-starter-kit
+%setup -q -n cockpit-starter-kit
+%setup -q -a 1 -n cockpit-starter-kit
+
+%build
+# ignore pre-built webpack in release tarball and rebuild it
+rm -rf dist
+NODE_ENV=production make
 
 %install
 %make_install

packit.yaml

@@ -4,7 +4,12 @@
 
 specfile_path: cockpit-starter-kit.spec
 actions:
-  post-upstream-clone: make cockpit-starter-kit.spec
+  post-upstream-clone:
+  post-upstream-clone:
+    - make cockpit-starter-kit.spec
+    # replace Source1 manually, as create-archive: can't handle multiple tarballs
+    - make node-cache
+    - sh -c 'sed -i "/^Source1:/ s/https:.*/$(ls *-node*.tar.xz)/" cockpit-*.spec'
   # build in development mode; production mode uses too much memory for limited
   # sandcastle containers; also reduce memory consumption of webpack
   # https://github.com/packit/sandcastle/pull/92