Merge pull request #3 from infosiftr/homes

Fix "cd" / "cd ~" my creating missing home directories

upstream/Dockerfile.builder

@@ -106,3 +106,20 @@ RUN mkdir -p rootfs/etc \
 		/usr/src/buildroot/system/skeleton/etc/shadow \
 		/usr/src/buildroot/system/skeleton/etc/group \
 		rootfs/etc/
+
+# create /tmp
+RUN mkdir -p rootfs/tmp \
+	&& chmod 1777 rootfs/tmp
+
+# create missing home directories
+RUN set -ex \
+	&& cd rootfs \
+	&& for userHome in $(awk -F ':' '{ print $3 ":" $4 "=" $6 }' etc/passwd); do \
+		user="${userHome%%=*}"; \
+		home="${userHome#*=}"; \
+		home="./${home#/}"; \
+		if [ ! -d "$home" ]; then \
+			mkdir -p "$home"; \
+			chown "$user" "$home"; \
+		fi; \
+	done