hurray for less dependency

Author: jphenow

Dockerfile

@@ -3,14 +3,8 @@ FROM percona/percona-postgresql-operator:2.6.0-ppg16.8-postgres
 # Switch to root user temporarily to gain necessary privileges for setup
 USER root
 
-# Install gosu for stepping down from root
-RUN apt-get update && apt-get install -y --no-install-recommends gosu \
-    && rm -rf /var/lib/apt/lists/* \
-    && apt-get clean
-
-# Create a custom entrypoint script that sets OOM score and starts postgres
-COPY entrypoint-wrapper.sh /usr/local/bin/
 COPY postgres-oom-adjuster.sh /usr/local/bin/
+COPY entrypoint-wrapper.sh /usr/local/bin/
 
 # We don't change the original ENTRYPOINT - we wrap around it
 ENTRYPOINT ["/usr/local/bin/entrypoint-wrapper.sh"]

entrypoint-wrapper.sh

@@ -22,6 +22,14 @@ echo "Started postmaster OOM adjuster in background"
 export PG_OOM_ADJUST_FILE=/proc/self/oom_score_adj
 export PG_OOM_ADJUST_VALUE=0
 
-# Verify the original entrypoint exists
+# Switching to the original user and executing original entrypoint
 echo "Switching to user $ORIGINAL_USER and executing original entrypoint: $ORIGINAL_ENTRYPOINT $@"
-exec gosu $ORIGINAL_USER "$ORIGINAL_ENTRYPOINT" "$@"
+
+# Check which user-switching command is available
+if command -v runuser >/dev/null 2>&1; then
+    # Use runuser (available on RHEL/CentOS/Fedora)
+    exec runuser -u "#$ORIGINAL_USER" -- "$ORIGINAL_ENTRYPOINT" "$@"
+else
+    # Fall back to su
+    exec su -s /bin/bash $ORIGINAL_USER -c "$ORIGINAL_ENTRYPOINT $*"
+fi