Only re-fetch and re-install if needed

Signed-off-by: Juan Cruz Viotti <jv@jviotti.com>

Makefile

@@ -17,7 +17,7 @@ build/fetch: | build
 
 .PHONY: prepare
 prepare: collections | build/fetch
-	./scripts/collections-fetch.sh $(realpath $<) $(realpath $|)
+	./scripts/collections-fetch.sh $(realpath $<) $(realpath $|) $(realpath $(SCHEMAS))
 	./scripts/collections-install.sh $(realpath $<) $(realpath $|) $(realpath $(SCHEMAS))
 	$(JSONSCHEMA) fmt --verbose $(realpath $(SCHEMAS))
 	./scripts/generate-configuration.sh $(realpath $<) "$(BASE_URL)" > configuration.json

schemas/krakend/schema/.collection.md5

@@ -0,0 +1 @@
+9f7ef952a1c213b1efead11d2a4da7aa

scripts/collections-fetch.sh

@@ -3,14 +3,15 @@
 set -o errexit
 set -o nounset
 
-if [ $# -lt 2 ]
+if [ $# -lt 3 ]
 then
-  echo "Usage: $0 <directory> <output>" 1>&2
+  echo "Usage: $0 <directory> <output> <schemas>" 1>&2
   exit 1
 fi
 
 DIRECTORY="$1"
 OUTPUT="$2"
+SCHEMAS="$3"
 
 echo "-- Fetching collections from $DIRECTORY into $OUTPUT" 1>&2
 
@@ -23,6 +24,19 @@ do
   TYPE="$(jq --raw-output '.type' "$collection")"
   URL="$(jq --raw-output '.url' "$collection")"
 
+  HASH_PATH="$SCHEMAS/$NAMESPACE/$ID/.collection.md5"
+  COLLECTION_HASH="$(md5sum "$collection" | cut -d ' ' -f 1)"
+  if [ -f "$HASH_PATH" ]
+  then
+    echo "-- Found collection hash marker: $HASH_PATH" 1>&2
+    CURRENT_HASH="$(tr -d '\n\r' < "$HASH_PATH")"
+    if [ "$CURRENT_HASH" = "$COLLECTION_HASH" ]
+    then
+      echo "-- Hashes match. Skipping fetch" 1>&2
+      continue
+    fi
+  fi
+
   echo "-- Fetching $collection ($TYPE) into $COLLECTION_OUTPUT" 1>&2
   if [ "$TYPE" = "git" ]
   then

scripts/collections-install.sh

@@ -25,6 +25,19 @@ do
   ID="$(basename "$collection" .json)"
   COLLECTION_OUTPUT="$OUTPUT/$NAMESPACE/$ID"
 
+  HASH_PATH="$COLLECTION_OUTPUT/.collection.md5"
+  COLLECTION_HASH="$(md5sum "$collection" | cut -d ' ' -f 1)"
+  if [ -f "$HASH_PATH" ]
+  then
+    echo "-- Found collection hash marker: $HASH_PATH" 1>&2
+    CURRENT_HASH="$(tr -d '\n\r' < "$HASH_PATH")"
+    if [ "$CURRENT_HASH" = "$COLLECTION_HASH" ]
+    then
+      echo "-- Hashes match. Skipping install" 1>&2
+      continue
+    fi
+  fi
+
   echo "-- Installing $collection into $COLLECTION_OUTPUT" 1>&2
 
   cd "$FETCH_DIRECTORY/$NAMESPACE/$ID"
@@ -61,4 +74,6 @@ do
   done
 
   cd - > /dev/null
+
+  echo "$COLLECTION_HASH" > "$HASH_PATH"
 done