Fix permission error and allow interactive mode in entrypoint.sh

Dockerfile

@@ -18,7 +18,9 @@ RUN useradd --system folding && \
     apt-get autoremove --yes && \
     rm -rf /var/lib/apt/lists/*
 
-COPY entrypoint.sh /opt/fahclient
+COPY --chown=folding:folding entrypoint.sh /opt/fahclient
+
+RUN chmod +x /opt/fahclient/entrypoint.sh
 
 ENV USER "Anonymous"
 ENV TEAM "0"

entrypoint.sh

@@ -1,11 +1,20 @@
 #!/bin/bash
+set -e
 
-/opt/fahclient/FAHClient \
-    --user=${USER} \
-    --team=${TEAM} \
-    --passkey=${PASSKEY} \
-    --gpu=${ENABLE_GPU} \
-    --smp=${ENABLE_SMP} \
+# if a command was specified, we run that command. E.g. helpful when we do
+# docker run -it <container> /bin/bash
+if [ "${1}" ]
+then
+  exec "$@"
+# otherwise we attempt to run boinc.
+else
+  /opt/fahclient/FAHClient \
+      --user="${USER}" \
+      --team="${TEAM}" \
+      --passkey="${PASSKEY}" \
+      --gpu="${ENABLE_GPU}" \
+      --smp="${ENABLE_SMP}" \
       --power=full \
       --gui-enabled=false \
-    ${@}
+      "${@}"
+fi