snapcraft.yaml: fix running hook-tests

Only run hook tests when root otherwise the chroot to the prime
dir will not work.

Makefile

@@ -51,13 +51,17 @@ test:
 		echo "no $(TESTDIR) found, please build the tree first "; \
 		exit 1; \
 	fi
-	set -ex; for f in ./hook-tests/[0-9]*.test; do \
-		/bin/cp -a $$f $(TESTDIR)/tmp && \
-		if ! chroot $(TESTDIR) /tmp/$$(basename $$f); then \
-                    exit 1; \
-                fi && \
-		rm -f $(TESTDIR)/tmp/$$(basename $$f); \
-	done;
+	if [ $$(id -u) -eq 0 ]; then \
+		set -ex; for f in ./hook-tests/[0-9]*.test; do \
+			/bin/cp -a $$f $(TESTDIR)/tmp && \
+			if ! chroot $(TESTDIR) /tmp/$$(basename $$f); then \
+				exit 1; \
+			fi && \
+			rm -f $(TESTDIR)/tmp/$$(basename $$f); \
+	    	done; \
+	else \
+		echo "Must be root to run the tests"; \
+	fi
 
 # Display a report of files that are (still) present in /etc
 .PHONY: etc-report

hook-tests/001-extra-packages.test

@@ -8,7 +8,8 @@
 
 set -e
 
-if [ "$(dpkg --print-architecture)" != "amd64" ]; then
+# no dpkg in the image so we can't use `dpkg --print-architecture` here
+if [ ! -d "lib/x86_64-linux-gnu" ]; then
     echo "only testing on amd64 for now"
     exit 0
 fi

snapcraft.yaml

@@ -33,4 +33,4 @@ parts:
       export PATH="$PATH:/snap/snapcraft/current/bin/scriptlet-bin"
       snapcraftctl prime
       # ensure build-in tests are run
-      (cd ${SNAPCRAFT_PART_SRC} && make test TESTDIR=${SNAPCRAFT_PRIME})
+      cd ${SNAPCRAFT_PART_SRC} && make test TESTDIR=${SNAPCRAFT_PRIME}