use a substvar to set the archive-keyring in debian/control

Adds a small helper to extract the small information bits we store in
apt-vendor.ent and uses it in debian/rules to set apt:keyring as a
substvar for debian/control populated with the &keyring-package; info

1 files changed, 36 insertions, 0 deletions

diff --git a/vendor/getinfo b/vendor/getinfo
new file mode 100755
index 000000000..df5a44e5c
--- /dev/null
+++ b/vendor/getinfo
@@ -0,0 +1,36 @@
+#!/bin/sh
+# small helper to extract information form *.ent files
+
+BASEDIR="$(readlink -f "$(dirname $0)")"
+INFO="$(readlink -f "${BASEDIR}/current/apt-vendor.ent")"
+
+if [ -z "$INFO" ] || [ ! -e "$INFO" ]; then
+	echo >&2 'The current vendor is not valid or not chosen by the buildsystem yet.'
+	exit 1
+fi
+
+getrawfield() {
+	grep --max-count=1 "^<!ENTITY $1 \"" "${2:-$INFO}" | cut -d'"' -f 2
+}
+
+getfield() {
+	local FIELD="$(getrawfield "$@")"
+	FIELD="${FIELD#*>}"
+	echo "${FIELD%<*}"
+}
+
+case "$1" in
+debian-stable-codename)
+	getrawfield 'stable-codename' "${BASEDIR}/../doc/apt-verbatim.ent"
+	;;
+ubuntu-codename)
+	getrawfield 'stable-codename' "${BASEDIR}/../doc/apt-verbatim.ent"
+	;;
+keyring-package)
+	getfield "$1"
+	;;
+*)
+	echo >&2 "Unknown data field $1 requested"
+	exit 2
+	;;
+esac