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zone comparison helpers
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satr14washere
parent
be1ebe0d15
commit
de22d7bd14
2 changed files with 205 additions and 1 deletions
200
scripts/compare-zones.sh
Executable file
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scripts/compare-zones.sh
Executable file
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#!/usr/bin/env bash
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#
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# compare-zones.sh — Compare a Cloudflare zone export against a nix-built zone file
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#
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# Usage:
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# ./scripts/compare-zones.sh <cloudflare-export.txt> [nix-result]
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#
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# Arguments:
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# cloudflare-export.txt Path to the Cloudflare zone export (BIND format)
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# nix-result Path to the nix-built zone file (default: ./result)
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#
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# Examples:
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# ./scripts/compare-zones.sh part-of.my.id.txt
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# ./scripts/compare-zones.sh part-of.my.id.txt result
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# nix build .#0 && ./scripts/compare-zones.sh part-of.my.id.txt result
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set -euo pipefail
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RED='\033[0;31m'
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GREEN='\033[0;32m'
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YELLOW='\033[0;33m'
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CYAN='\033[0;36m'
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BOLD='\033[1m'
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RESET='\033[0m'
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usage() {
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echo "Usage: $0 <cloudflare-export.txt> [nix-result]"
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echo ""
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echo "Compare a Cloudflare zone export against a nix-built zone file."
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echo ""
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echo "Arguments:"
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echo " cloudflare-export.txt Path to the Cloudflare BIND zone export"
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echo " nix-result Path to the nix-built zone file (default: ./result)"
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exit 1
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}
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if [[ $# -lt 1 ]]; then
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usage
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fi
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CF_EXPORT="$1"
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NIX_RESULT="${2:-./result}"
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if [[ ! -f "$CF_EXPORT" ]]; then
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echo -e "${RED}Error:${RESET} Cloudflare export not found: $CF_EXPORT"
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exit 1
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fi
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if [[ ! -e "$NIX_RESULT" ]]; then
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echo -e "${RED}Error:${RESET} Nix result not found: $NIX_RESULT"
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echo "Hint: run 'nix build .#0' first"
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exit 1
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fi
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# If result is a symlink (nix build output), resolve it
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if [[ -L "$NIX_RESULT" ]]; then
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NIX_RESULT="$(readlink -f "$NIX_RESULT")"
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fi
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TMPDIR="$(mktemp -d)"
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trap 'rm -rf "$TMPDIR"' EXIT
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# normalize_zone <input-file> <output-file>
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#
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# Extracts resource records (A, AAAA, CNAME, MX, TXT, SRV, CAA, NS, SOA),
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# strips comments, normalizes whitespace and TTLs, and sorts.
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normalize_zone() {
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local input="$1"
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local output="$2"
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# 1. Remove comment-only lines and blank lines
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# 2. Strip inline comments ("; ...")
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# 3. Collapse whitespace
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# 4. Normalize: <name> <class> <type> <rdata> (drop TTL)
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# 5. Ensure FQDNs on NS/CNAME/MX targets end with a dot
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# 6. Sort for stable comparison
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grep -E '^\S+' "$input" \
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| grep -v '^\s*;' \
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| grep -v '^\s*$' \
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| grep -v '^\$' \
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| sed 's/\s*;.*$//' \
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| sed 's/\t\+/ /g; s/ \+/ /g' \
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| awk '
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{
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# Expected formats after cleanup:
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# name TTL IN TYPE rdata...
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# name IN TYPE rdata...
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#
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# We want to output: name TYPE rdata...
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name = $1
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idx = 2
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# Skip TTL if present (a number)
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if ($idx ~ /^[0-9]+$/) idx++
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# Skip class (IN, CS, CH, HS)
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if (toupper($idx) == "IN" || toupper($idx) == "CS" || toupper($idx) == "CH" || toupper($idx) == "HS") idx++
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rtype = toupper($idx)
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idx++
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# Skip SOA — it will always differ (serial, timers)
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if (rtype == "SOA") next
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rdata = ""
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for (i = idx; i <= NF; i++) {
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val = $i
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# Ensure trailing dot on targets for NS, CNAME, MX (last field)
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if ((rtype == "NS" || rtype == "CNAME") && i == idx) {
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if (val !~ /\.$/) val = val "."
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}
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if (rtype == "MX" && i == NF) {
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if (val !~ /\.$/) val = val "."
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}
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if (rdata != "") rdata = rdata " "
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rdata = rdata val
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}
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print name " " rtype " " rdata
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}
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' \
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| sort > "$output"
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}
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echo -e "${BOLD}Comparing zones${RESET}"
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echo -e " Cloudflare export: ${CYAN}$CF_EXPORT${RESET}"
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echo -e " Nix result: ${CYAN}$NIX_RESULT${RESET}"
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echo ""
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normalize_zone "$CF_EXPORT" "$TMPDIR/cf.norm"
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normalize_zone "$NIX_RESULT" "$TMPDIR/nix.norm"
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CF_COUNT=$(wc -l < "$TMPDIR/cf.norm")
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NIX_COUNT=$(wc -l < "$TMPDIR/nix.norm")
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echo -e " Cloudflare records: ${BOLD}$CF_COUNT${RESET} (excluding SOA)"
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echo -e " Nix records: ${BOLD}$NIX_COUNT${RESET} (excluding SOA)"
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echo ""
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# Compute differences
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# Lines only in Cloudflare = missing from nix
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# Lines only in nix = extra in nix
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comm -23 "$TMPDIR/cf.norm" "$TMPDIR/nix.norm" > "$TMPDIR/only-cf.txt"
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comm -13 "$TMPDIR/cf.norm" "$TMPDIR/nix.norm" > "$TMPDIR/only-nix.txt"
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comm -12 "$TMPDIR/cf.norm" "$TMPDIR/nix.norm" > "$TMPDIR/matching.txt"
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MATCH_COUNT=$(wc -l < "$TMPDIR/matching.txt")
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ONLY_CF_COUNT=$(wc -l < "$TMPDIR/only-cf.txt")
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ONLY_NIX_COUNT=$(wc -l < "$TMPDIR/only-nix.txt")
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echo -e "${BOLD}Results${RESET}"
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echo -e " ${GREEN}✓ Matching:${RESET} $MATCH_COUNT"
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echo -e " ${RED}✗ Only in Cloudflare:${RESET} $ONLY_CF_COUNT (missing from nix build)"
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echo -e " ${YELLOW}+ Only in Nix:${RESET} $ONLY_NIX_COUNT (extra in nix build)"
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echo ""
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if [[ "$ONLY_CF_COUNT" -gt 0 ]]; then
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echo -e "${RED}${BOLD}Records only in Cloudflare (missing from nix):${RESET}"
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while IFS= read -r line; do
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echo -e " ${RED}-${RESET} $line"
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done < "$TMPDIR/only-cf.txt"
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echo ""
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fi
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if [[ "$ONLY_NIX_COUNT" -gt 0 ]]; then
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echo -e "${YELLOW}${BOLD}Records only in Nix (not in Cloudflare):${RESET}"
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while IFS= read -r line; do
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echo -e " ${YELLOW}+${RESET} $line"
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done < "$TMPDIR/only-nix.txt"
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echo ""
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fi
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if [[ "$ONLY_CF_COUNT" -eq 0 && "$ONLY_NIX_COUNT" -eq 0 ]]; then
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echo -e "${GREEN}${BOLD}✓ Zones are identical!${RESET}"
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exit 0
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else
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# Show a unified-style diff for a quick overview
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echo -e "${BOLD}Diff (unified):${RESET}"
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diff -u \
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--label "cloudflare" "$TMPDIR/cf.norm" \
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--label "nix" "$TMPDIR/nix.norm" \
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| head -80 || true
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echo ""
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# Summarize by record type
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echo -e "${BOLD}Summary by record type:${RESET}"
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echo -e " ${BOLD}Type CF-only Nix-only Matching${RESET}"
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{
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cat "$TMPDIR/only-cf.txt" "$TMPDIR/only-nix.txt" "$TMPDIR/matching.txt"
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} | awk '{print $2}' | sort -u | while read -r rtype; do
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cf_only=$(grep -c "^[^ ]* ${rtype} " "$TMPDIR/only-cf.txt" || true)
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nix_only=$(grep -c "^[^ ]* ${rtype} " "$TMPDIR/only-nix.txt" || true)
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matching=$(grep -c "^[^ ]* ${rtype} " "$TMPDIR/matching.txt" || true)
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printf " %-6s %7d %8d %8d\n" "$rtype" "$cf_only" "$nix_only" "$matching"
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done
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echo ""
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exit 1
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fi
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