From cfa5e7e09ea02cf810c134826f6ed8764b8a7c3d Mon Sep 17 00:00:00 2001
From: Daryl Lim <5508348+daryllimyt@users.noreply.github.com>
Date: Sun, 18 Aug 2024 15:35:19 -0700
Subject: [PATCH] feat: Add env-migration script (#315)

---
 env-migration.sh | 89 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100755 env-migration.sh

diff --git a/env-migration.sh b/env-migration.sh
new file mode 100755
index 000000000..324ccec23
--- /dev/null
+++ b/env-migration.sh
@@ -0,0 +1,89 @@
+#!/bin/bash
+
+# SUMMARY
+# -------
+# This script migrates your existing .env file to match a new .env.template structure.
+# Here's what it does:
+#
+# 1. Creates a timestamped backup of your current .env file.
+# 2. Reads your existing .env file and the new .env.template.
+# 3. Creates a new .env file based on the .env.template structure.
+# 4. Preserves values from your old .env for keys that exist in the new template.
+# 5. Adds new keys from the template (with empty values) if they didn't exist in your old .env.
+# 6. Ignores keys from your old .env that don't exist in the new template.
+#
+# Note: This script will overwrite your current .env file, but a backup is always created first.
+# You will be asked for confirmation before any changes are made.
+
+# Function to read and parse .env file
+parse_env() {
+    local file=$1
+    grep -v '^#' "$file" | grep '=' | sed 's/[[:space:]]*=[[:space:]]*/=/' | sed 's/^[[:space:]]*//' | sed 's/[[:space:]]*$//'
+}
+
+# Get current datetime
+DATETIME=$(date "+%Y%m%d_%H%M%S")
+
+# Paths to the files
+OLD_ENV=".env"
+NEW_TEMPLATE=".env.example"
+OUTPUT_ENV=".env"
+BACKUP_ENV=".env.backup_${DATETIME}"
+
+# Check if .env file exists
+if [ ! -f "$OLD_ENV" ]; then
+    echo "Error: $OLD_ENV file not found."
+    exit 1
+fi
+
+# Check if .env.template file exists
+if [ ! -f "$NEW_TEMPLATE" ]; then
+    echo "Error: $NEW_TEMPLATE file not found."
+    exit 1
+fi
+
+# Prompt for backup
+read -p "Do you want to create a backup of the current .env file? (y/n): " backup_choice
+if [[ $backup_choice =~ ^[Yy]$ ]]; then
+    cp "$OLD_ENV" "$BACKUP_ENV"
+    echo "Backup created at $BACKUP_ENV"
+fi
+
+# Warning about overriding
+echo "Warning: This script will override the current .env file."
+read -p "Do you want to continue? (y/n): " continue_choice
+if [[ ! $continue_choice =~ ^[Yy]$ ]]; then
+    echo "Operation cancelled."
+    exit 0
+fi
+
+# Temporary file for processing
+TEMP_FILE=$(mktemp)
+
+# Process the new template and create the output
+while IFS= read -r line || [[ -n "$line" ]]; do
+    if [[ $line =~ ^[[:space:]]*$ || $line =~ ^# ]]; then
+        # Empty line or comment, copy as is
+        echo "$line" >> "$TEMP_FILE"
+    elif [[ $line =~ ^[[:space:]]*([^=]+)[[:space:]]*= ]]; then
+        # Extract key
+        key=${BASH_REMATCH[1]}
+        # Look for the key in the old .env file
+        old_value=$(grep "^${key}=" "$OLD_ENV" | sed "s/^${key}=//")
+        if [[ -n "$old_value" ]]; then
+            # Key exists in old .env, use its value
+            echo "${key}=${old_value}" >> "$TEMP_FILE"
+        else
+            # Key doesn't exist in old .env, copy line as is
+            echo "$line" >> "$TEMP_FILE"
+        fi
+    else
+        # Any other line, copy as is
+        echo "$line" >> "$TEMP_FILE"
+    fi
+done < "$NEW_TEMPLATE"
+
+# Move the temporary file to the final output
+mv "$TEMP_FILE" "$OUTPUT_ENV"
+
+echo "Migration completed. New .env file created"