Enhance Dockerfile to create a writable workspace under /srv/LeafWeb and update piscal_manager.sh to check for write permissions on working directories.

Dockerfile

@@ -67,6 +67,13 @@ RUN set -xe \
 RUN set -xe \
 	&& mkdir /run/sshd
 
+# Ensure the job/workspace base under /srv is writable.
+# The client uses `/srv/${PiscalDirectoryName}/input` and `PiscalDirectoryName`
+# can itself be prefixed with `LeafWeb/...`.
+RUN set -xe \
+	&& mkdir -p /srv/LeafWeb \
+	&& chown -R ${SSH_USERNAME}:${SSH_GROUP} /srv/LeafWeb
+
 # Create storage directory structure with proper ownership
 RUN set -xe \
 	&& mkdir -p ${STORAGE_PATH}/input \

piscal-manager/piscal_manager.sh

@@ -88,7 +88,7 @@ for candidate in \
     "$PWD/$directory_name" \
     "/srv/$directory_name"
 do
-    if [ -d "$candidate/$input_directory_name" ]; then
+    if [ -d "$candidate/$input_directory_name" ] && [ -w "$candidate" ]; then
         working_directory="$candidate"
         break
     fi
@@ -109,6 +109,10 @@ if [ "$task" = "launch" ] || [ "$task" = "get_status" ] || [ "$task" = "get_stat
         echo "working directory $working_directory not found"
         exit 1
     fi
+    if [ ! -w "$working_directory" ]; then
+        echo "working directory $working_directory is not writable"
+        exit 1
+    fi
     if [ ! -d "$input_directory" ]; then
         echo "input directory $input_directory not found"
         exit 1