chore(scripts): add repair_docker.sh to validate and recover docker daemon.json and restart docker

scripts/repair_docker.sh

@@ -0,0 +1,101 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Repair helper for Docker daemon config and service
+# - Validates /etc/docker/daemon.json (using jq or python3)
+# - Backs up invalid config and writes a minimal valid config
+# - Restarts docker and collects logs
+# - Attempts to run configure_docker_daemon from the repo if available
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+LOGFILE="/tmp/repair_docker_$(date +%s).log"
+
+echo "Repair started at $(date)" > "$LOGFILE"
+
+# Load repo helpers if present
+if [[ -f "$SCRIPT_DIR/config/defaults.sh" ]]; then
+    # shellcheck disable=SC1091
+    source "$SCRIPT_DIR/config/defaults.sh" || true
+fi
+if [[ -f "$SCRIPT_DIR/lib/common.sh" ]]; then
+    # shellcheck disable=SC1091
+    source "$SCRIPT_DIR/lib/common.sh" || true
+fi
+if [[ -f "$SCRIPT_DIR/lib/docker.sh" ]]; then
+    # shellcheck disable=SC1091
+    source "$SCRIPT_DIR/lib/docker.sh" || true
+fi
+
+validate_json() {
+    local file="$1"
+    if command -v jq >/dev/null 2>&1; then
+        jq empty "$file" >/dev/null 2>&1
+        return $?
+    elif command -v python3 >/dev/null 2>&1; then
+        python3 -m json.tool "$file" >/dev/null 2>&1
+        return $?
+    else
+        # conservative: try to detect a trailing EOF or obvious truncation
+        if [[ -s "$file" ]]; then
+            return 0
+        else
+            return 1
+        fi
+    fi
+}
+
+echo "Using repo at: $SCRIPT_DIR" >> "$LOGFILE"
+
+if [[ -f /etc/docker/daemon.json ]]; then
+    echo "/etc/docker/daemon.json exists - validating..." | tee -a "$LOGFILE"
+    if validate_json /etc/docker/daemon.json; then
+        echo "daemon.json is valid" | tee -a "$LOGFILE"
+    else
+        echo "daemon.json is INVALID - backing up and replacing with minimal config" | tee -a "$LOGFILE"
+        sudo mkdir -p /tmp/docker-repair-backups
+        sudo mv /etc/docker/daemon.json "/tmp/docker-repair-backups/daemon.json.broken.$(date +%s)"
+        sudo tee /etc/docker/daemon.json > /dev/null <<'EOF'
+{
+  "storage-driver": "overlay2"
+}
+EOF
+        echo "Wrote minimal /etc/docker/daemon.json" | tee -a "$LOGFILE"
+    fi
+else
+    echo "/etc/docker/daemon.json does not exist - creating minimal config" | tee -a "$LOGFILE"
+    sudo mkdir -p /etc/docker
+    sudo tee /etc/docker/daemon.json > /dev/null <<'EOF'
+{
+  "storage-driver": "overlay2"
+}
+EOF
+fi
+
+echo "Reloading systemd daemon and restarting docker" | tee -a "$LOGFILE"
+sudo systemctl daemon-reload || true
+if sudo systemctl restart docker; then
+    echo "Docker restarted successfully" | tee -a "$LOGFILE"
+    sudo journalctl -u docker --no-pager -n 200 >> "$LOGFILE" 2>&1 || true
+else
+    echo "Docker failed to restart - collecting logs" | tee -a "$LOGFILE"
+    sudo journalctl -u docker --no-pager -n 500 >> "$LOGFILE" 2>&1 || true
+
+    # Try to run configure_docker_daemon from this repo if available
+    if declare -F configure_docker_daemon >/dev/null 2>&1; then
+        echo "Attempting to run configure_docker_daemon() from repo" | tee -a "$LOGFILE"
+        if configure_docker_daemon >> "$LOGFILE" 2>&1; then
+            echo "configure_docker_daemon executed - attempting docker restart" | tee -a "$LOGFILE"
+            sudo systemctl restart docker >> "$LOGFILE" 2>&1 || true
+            sudo journalctl -u docker --no-pager -n 200 >> "$LOGFILE" 2>&1 || true
+        else
+            echo "configure_docker_daemon failed" | tee -a "$LOGFILE"
+        fi
+    else
+        echo "configure_docker_daemon function not available in sourced repo files" | tee -a "$LOGFILE"
+    fi
+fi
+
+echo "Repair finished at $(date)" | tee -a "$LOGFILE"
+echo "Logfile: $LOGFILE"
+
+exit 0