Add to mirror NERSC

Dockerfile

@@ -45,13 +45,16 @@ ENV DESI_BUCKET_CACHE=$HOME/.desibucket_cache
 # For compatibility with NERSC, $DESI_ROOT points to the base of the latest public data release
 ENV DESI_ROOT=$DESI_BUCKET/$DESI_RELEASE
 
+# NERSC also provides a "scratch" directory for scratch work
+ENV SCRATCH=$HOME/scratch
+
 # Docker mounts local user files in $(pwd) to $MOUNT,
 # which we symlink to $SYNCED
 ENV MOUNT=/mnt/local_volume
 ENV SYNCED=$HOME/synced
 
 # Create directories
-RUN mkdir -p $HOME $DESI_HUB $DESI_BUCKET $DESI_BUCKET_CACHE $MOUNT \
+RUN mkdir -p $HOME $DESI_HUB $DESI_BUCKET $DESI_BUCKET_CACHE $SCRATCH $MOUNT \
     && ln -s $MOUNT $SYNCED
 
 # Add startup file to home directory

welcome.ipynb

@@ -14,6 +14,7 @@
     "* Pipeline code for processing the data are installed at **~/desihub**.\n",
     "* For convenience, files inside **~/synced** (`$SYNCED`) are synced to the directory in which you ran this container.\n",
     "* Additionally, all files in this container are saved in a volume that you can access with `docker volume`.\n",
+    "* This includes scratch work done in, say, **~/scratch** (`$SCRATCH`).\n",
     "\n",
     "*April 2024 - Xing Liu (UC Berkeley) and Anthony Kremin (Berkeley lab)*"
    ]