setup-local-repo: Fix multiple patches per ebuild

If multiple patches are provided for the same package, we need to ensure
that they all applied.  Previously, only the last patch was applied,
because the ebuilds were copied from the main repository each time,
undoing all previous patches.

setup-local-repo.sh

@@ -19,13 +19,23 @@ location = ${PWD}/repos/x-portage
 auto-sync = no
 EOF
 
+find repos/x-portage \
+    -mindepth 1 \
+    -maxdepth 1 \
+    -type d \
+    -not -name metadata \
+    -not -name profiles \
+    | xargs rm -rfv
+
 for patch in patches/ebuilds/*/*/*.patch; do
     [ -f "${patch}" ] || continue
     cp=${patch#patches/ebuilds/}
     cp=${cp%/*.patch}
     printf 'Applying patch %s for %s ...\n' "${patch##*/}" "${cp}"
-    mkdir -p repos/x-portage/${cp}
-    cp -r /var/db/repos/gentoo/${cp}/. repos/x-portage/${cp}
+    if [ ! -d repos/x-portage/${cp} ]; then
+        mkdir -p repos/x-portage/${cp}
+        cp -r /var/db/repos/gentoo/${cp}/. repos/x-portage/${cp}
+    fi
     for f in repos/x-portage/${cp}/*.ebuild; do
         patch "${f}" "${patch}"
         ebuild "${f}" digest