scrips: generate kresd PGP keyblock

diff --git a/scripts/gen-pgp-keyblock.sh b/scripts/gen-pgp-keyblock.sh
new file mode 100755 (executable)
index 0000000..eb6500a
--- /dev/null
+++ b/scripts/gen-pgp-keyblock.sh
@@ -0,0 +1,38 @@
+#!/bin/bash
+# Script to create/update Knot Resolver PGP keyring
+set -o errexit -o nounset
+
+keys=(
+    'B6006460B60A80E782062449E747DF1F9575A3AA'  # vladimir.cunat@nic.cz
+    '4A8BA48C2AED933BD495C509A1FBA5F7EF8C4869'  # tomas.krizek@nic.cz
+    '457996D019A7B7C6C2F6862A16CFB506F21D834A'  # lukas.jezek@nic.cz
+)
+outfile="kresd-keyblock.asc"
+url="https://secure.nic.cz/files/knot-resolver/kresd-keyblock.asc"
+
+keyring="$(mktemp -d)"
+keyring_import="$(mktemp -d)"
+published="$(mktemp)"
+
+cleanup() {
+    rm -rf "${keyring}"
+    rm -rf "${keyring_import}"
+    rm -rf "${published}"
+}
+trap cleanup EXIT
+
+# obtain keys from keys.openpgp.org
+gpg --homedir "${keyring}" -q --keyserver keys.openpgp.org --recv-keys "${keys[@]}"
+
+# export minimal size keys with just the necessary signatures
+rm -f "${outfile}"
+gpg --homedir "${keyring}" -q --export --export-options export-minimal --armor --output "${outfile}" "${keys[@]}"
+
+# display keys after import
+gpg --homedir "${keyring_import}" -q --import "${outfile}"
+gpg --homedir "${keyring_import}" -k
+echo "Created: ${outfile}"
+
+# check if update of secure.nic.cz keyblock might be needed
+curl -sfo "${published}" "${url}"
+diff -q "${outfile}" "${published}" &>/dev/null || echo "Generated keyblock differs from ${url}"