Compare two directories containing yaml files, e.g. two kubernetes environments for an app

yamldiff.sh

#!/bin/bash

# Compare two directories containing yaml files recursively

# Dependencies:
# 1. [delta](https://github.com/dandavison/delta)

# Inputs:
# $1: First directory
# $2: Second directory

TMP_DIR=$(mktemp -d)
trap 'rm -rf "$TMP_DIR"' EXIT

# Output differences
PAIRS=$(diff -qr $1 $2 | grep '^Files' \
  | cut -f2,4 -d ' ' \
  | tr "\t" " ")
echo "$PAIRS" | while read line; do
  FIRST_FILE="$(echo "$line" | cut -f1 -d ' ')"
  SECOND_FILE="$(echo "$line" | cut -f2 -d ' ')"

  # Sort keys and store them as temporary files
  # The only reason to store them as temporary files is to get a useful file
  # name header when diffing with delta.
  FIRST_TMP_FILE="$TMP_DIR"/"$FIRST_FILE"
  SECOND_TMP_FILE="$TMP_DIR"/"$SECOND_FILE"
  mkdir -p "$(dirname $FIRST_TMP_FILE)"
  mkdir -p "$(dirname $SECOND_TMP_FILE)"
  yq --prettyPrint 'sort_keys(..)' "$FIRST_FILE" > "$FIRST_TMP_FILE"
  yq --prettyPrint 'sort_keys(..)' "$SECOND_FILE" > "$SECOND_TMP_FILE"

  # This is hacky, I couldn't get "s,$TMP_DIR,," to work, for some reason it
  # did nothing.
  TMP_DIRNAME_LEN=${#TMP_DIR}
  STRIP_TMP_DIR_PATTERN="s/.{$TMP_DIRNAME_LEN}//"
  delta \
    --file-transformation "$STRIP_TMP_DIR_PATTERN" \
    "$FIRST_TMP_FILE" "$SECOND_TMP_FILE"
done
echo

# Output files that are missing in one directory
diff -qr $1 $2 | grep '^Only in'

A simple version is just to do

diff -r dir1 dir2

What this script adds is sorting the keys so that the order doesn't matter, prettyprinting so indentation style doesn't matter, and using delta for a nicer output.