updated 105_6

Author: shenmingfu

DP1/100_How_to_Use_RSP_Tools/105_Image_reprocessing/105_6_Create_custom_coadd_images.ipynb

@@ -549,7 +549,7 @@
    "source": [
     "Users cannot write to the main DP1 Butler repository. Instead, make a writable repository where custom coadd outputs will be written. \n",
     "\n",
-    "The call to `use_local_butler` sets a directory that will contain the local Butler repository, within the `$SCRATCH_DIR` temporary space (on the Rubin Science Platform, RSP) that gets deleted every Sunday morning (Pacific Time). Use this temporary space because the custom coadd processing produces of order a gigabyte of intermediate files. Do not run this step (and following steps) right before or during the Sunday cleaning time. \n",
+    "The call to `use_local_butler` sets a directory that will contain the local Butler repository, within the `$SCRATCH_DIR` temporary space (on the Rubin Science Platform, RSP) that gets deleted every Sunday around noon Pacific Time. Use this temporary space because the custom coadd processing produces of order a gigabyte of intermediate files. Do not run this step (and following steps) right before or during the Sunday cleaning time. \n",
     "\n",
     "Note `use_local_butler` does not create a top-level directory, but rather one in the scratch space; it does not create `$SCRATCH_DIR`. Thus, check whether that user scratch exists first before using it and create it if it does not.\n",
     "\n",
@@ -563,11 +563,13 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "scratch_path = Path(os.getenv(\"SCRATCH_DIR\"))\n",
+    "scratch_dir = os.getenv(\"SCRATCH_DIR\")\n",
+    "if scratch_dir is not None:\n",
+    "    scratch_path = Path(scratch_dir)\n",
     "\n",
     "if not scratch_path.exists():\n",
     "    scratch_path.mkdir(parents=True)\n",
-    "    \n",
+    "\n",
     "elif not scratch_path.is_dir():\n",
     "    scratch_path.unlink()\n",
     "    scratch_path.mkdir()"