Allow to have no imported SSH keys in the image

Author: claudiospizzi

docker/entrypoint.sh

@@ -3,21 +3,27 @@
 # Enable strict mode (exit on error).
 set -e
 
-# Copy all ssh keys to the home directory, as the temporary directory will be
-# cleared within seconds afters starting the container.
-cp -R /tmp/.ssh/* /root/.ssh/
+# The /tmp/.ssh directory is used to pass SSH keys to the container. If it is empty
+# or does not exist, no SSH keys will be imported.
+if [ -d "/tmp/.ssh" ] && [ "$(ls -A /tmp/.ssh 2>/dev/null)" ]; then
 
-# Ensure proper line breaks and line endings in all SSH key files.
-find /root/.ssh -type f -name "id_*" -exec dos2unix -q {} +
+    # Copy all SSH keys from the temporary directory to the root's SSH directory.
+    cp -R /tmp/.ssh/* /root/.ssh/
 
-# Set the required permissions for SSH key files.
-chmod 700 /root/.ssh
-find /root/.ssh/ -type f -name "id_*" -exec chmod 600 {} +
-find /root/.ssh/ -type f -name "id_*.pub" -exec chmod 644 {} +
+    # Ensure proper line breaks and line endings in all SSH key files.
+    find /root/.ssh -type f -name "id_*" -exec dos2unix -q {} +
+
+    # Set the required permissions for SSH key files.
+    find /root/.ssh/ -type f -name "id_*" -exec chmod 600 {} +
+    find /root/.ssh/ -type f -name "id_*.pub" -exec chmod 644 {} +
 
-# Start the ssh agent and add the keys to the current session.
-eval "$(ssh-agent)" > /dev/null
-find /root/.ssh -type f -name "id_*" ! -name "*.pub" -exec ssh-add -q {} \;
+    # Start the ssh agent and add the keys to the current session.
+    eval "$(ssh-agent)" > /dev/null
+    find /root/.ssh -type f -name "id_*" ! -name "*.pub" -exec ssh-add -q {} \;
+fi
+
+# Set the required permissions for the SSH directory.
+chmod 700 /root/.ssh
 
 # Execute the command passed as arguments.
 exec "$@"