check for jigit-mkimage existence

releng/releng_build_isojigdo

@@ -128,11 +128,20 @@ echo -e "$0: Creating ISO and jigdo representations:\n$CMD\n"
 ${CMD}
 
 # create another one from jigdo files
+if which jigit-mkimage >/dev/null 2>&1; then
+ printf "$0: Creating new ISO from jigdo files..."
  jigit-mkimage \
   -t ${IMG}.template \
   -j ${IMG}.jigdo \
   -m Debian=${DIR} \
   -o ${IMG}.new
+ printf "Done.\n"
+else
+ printf "\n$0: Not found: jigit-mkimage. Install jigit.\n"
+ exit 1
+fi
+
+
 
 # trap the exit code of diff and let the Universe explode
 diff ${IMG}.iso ${IMG}.new