Devops: add pull-env.sh helper to sync env

Author: j0ntz

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased (develop)
 
 - added: push-env-key.sh script for updating env configs on remote servers
+- added: pull-env.sh helper that pulls remote env.json and backs up local changes before overwriting
 
 ## 4.45.0 (staging)
 

scripts/pull-env.sh

@@ -0,0 +1,75 @@
+#!/bin/bash
+set -euo pipefail
+
+REMOTE_HOST="jack"
+REMOTE_FILE="env.json"
+LOCAL_ENV="env.json"
+REMOTE_BASE='\$HOME/jenkins-files'
+
+usage() {
+  cat <<EOF
+Pull the remote env.json from $REMOTE_HOST and update the local copy.
+
+Usage: $(basename "$0") [-f FOLDER]
+
+  -f FOLDER  Remote folder under ~/jenkins-files (default: master)
+  -h         Show this help message
+EOF
+  exit 1
+}
+
+TARGET_FOLDER=""
+while getopts "f:h" opt; do
+  case $opt in
+    f) TARGET_FOLDER="$OPTARG" ;;
+    h) usage ;;
+    *) usage ;;
+  esac
+done
+shift $((OPTIND - 1))
+
+TARGET_FOLDER="${TARGET_FOLDER:-master}"
+TARGET_FOLDER="${TARGET_FOLDER#/}"
+TARGET_FOLDER="${TARGET_FOLDER%/}"
+[ -z "$TARGET_FOLDER" ] && TARGET_FOLDER="master"
+
+REMOTE_REPO="$REMOTE_BASE/$TARGET_FOLDER"
+
+REMOTE_TMP="$(mktemp)"
+trap 'rm -f "$REMOTE_TMP"' EXIT
+
+echo "Pulling latest env.json from $REMOTE_HOST ($TARGET_FOLDER)..."
+ssh "$REMOTE_HOST" "cd \"$(eval echo $REMOTE_REPO)\" && git pull --ff-only" >&2
+scp -q "$REMOTE_HOST:$(ssh $REMOTE_HOST eval echo $REMOTE_REPO)/$REMOTE_FILE" "$REMOTE_TMP"
+
+backup_local_env() {
+  local base="${LOCAL_ENV}.bak"
+  local candidate="$base"
+  if [ -e "$candidate" ]; then
+    local counter=1
+    while [ -e "${base}-${counter}" ]; do
+      counter=$((counter + 1))
+    done
+    candidate="${base}-${counter}"
+  fi
+
+  cp "$LOCAL_ENV" "$candidate"
+  echo "$candidate"
+}
+
+if [ ! -f "$LOCAL_ENV" ]; then
+  echo "No local $LOCAL_ENV found; creating from remote."
+  cp "$REMOTE_TMP" "$LOCAL_ENV"
+  exit 0
+fi
+
+if diff -q "$LOCAL_ENV" "$REMOTE_TMP" >/dev/null 2>&1; then
+  echo "Local $LOCAL_ENV already matches remote; nothing to do."
+  exit 0
+fi
+
+BACKUP_PATH=$(backup_local_env)
+echo "Backed up local $LOCAL_ENV to $BACKUP_PATH"
+
+cp "$REMOTE_TMP" "$LOCAL_ENV"
+echo "Updated $LOCAL_ENV with contents from $REMOTE_HOST/$TARGET_FOLDER."