Align dev container Instant Client TZ data with Oracle server

CI applies the same workaround in #2734 to dodge ORA-01805 caused by
drift between gvenzl/oracle-free:latest and the bundled Instant Client.
Mirror it for the dev container without dragging the Docker CLI into
the dev container itself.

initializeCommand runs on the host, where Docker is already available.
Pull the gvenzl image and copy timezlrg_*.dat out of it via an
ephemeral container, dropping the file under .devcontainer/tzdata/ on
the host. docker-compose bind-mounts that directory read-only at
/opt/tzdata inside the dev container, and postCreateCommand exports
ORA_TZFILE from there and persists it via /etc/profile.d so interactive
shells and bundle exec runs pick it up.

The TZ data ships in the image, so the copy step does not start Oracle
or wait for the database. No docker-outside-of-docker feature, no
/var/run/docker.sock bind mount, and no GPG-key fetching at build time.

Author: yahonda

.devcontainer/devcontainer.json

@@ -15,7 +15,7 @@
       ]
     }
   },
-  "initializeCommand": "docker pull gvenzl/oracle-free:latest",
+  "initializeCommand": "bash .devcontainer/initializeCommand.sh",
   "postCreateCommand": "bash .devcontainer/postCreateCommand.sh",
   "remoteEnv": {
     "DATABASE_NAME": "FREEPDB1",

.devcontainer/docker-compose.yml

@@ -5,6 +5,7 @@ services:
       dockerfile: Dockerfile
     volumes:
       - ..:/workspaces/oracle-enhanced:cached
+      - ./tzdata:/opt/tzdata:ro
     command: sleep infinity
     network_mode: service:oracle
 

.devcontainer/initializeCommand.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+IMAGE=gvenzl/oracle-free:latest
+SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)
+OUT_DIR="$SCRIPT_DIR/tzdata"
+
+docker pull "$IMAGE"
+
+mkdir -p "$OUT_DIR"
+rm -f "$OUT_DIR"/timezlrg_*.dat "$OUT_DIR"/timezdif_*.dat
+
+docker run --rm --entrypoint sh \
+  -v "$OUT_DIR:/out" \
+  "$IMAGE" \
+  -c 'cp "$ORACLE_HOME"/oracore/zoneinfo/timezlrg_*.dat /out/ && chmod a+r /out/*.dat'
+
+ls -1 "$OUT_DIR"

.devcontainer/postCreateCommand.sh

@@ -5,6 +5,18 @@ set -e
 gem update --system
 bundle install
 
+# Match Instant Client TZ data to the Oracle server's to avoid ORA-01805.
+# The file is extracted from the gvenzl image into .devcontainer/tzdata/ by
+# initializeCommand.sh and bind-mounted read-only at /opt/tzdata.
+TZ_FILE=$(ls /opt/tzdata/timezlrg_*.dat 2>/dev/null | head -1)
+if [ -n "$TZ_FILE" ]; then
+  echo "Using $TZ_FILE for Instant Client TZ data."
+  export ORA_TZFILE="$TZ_FILE"
+  echo "export ORA_TZFILE=$TZ_FILE" | sudo tee /etc/profile.d/ora-tzfile.sh > /dev/null
+else
+  echo "Warning: no timezlrg_*.dat found under /opt/tzdata; skipping ORA_TZFILE setup." >&2
+fi
+
 echo "Waiting for Oracle to be ready..."
 oracle_ready=false
 for i in $(seq 1 30); do

.gitignore

@@ -14,3 +14,4 @@ Gemfile.lock
 ojdbc*.jar
 .byebug_history
 debug.log
+.devcontainer/tzdata/