1 files changed, 37 insertions, 0 deletions
diff --git a/hooks/maybe-jessie-or-older/extract00.sh b/hooks/maybe-jessie-or-older/extract00.sh
new file mode 100755
index 0000000..9a82fbf
--- /dev/null
+++ b/hooks/maybe-jessie-or-older/extract00.sh
@@ -0,0 +1,37 @@
+#!/bin/sh
+
+set -eu
+
+# we need to check the version of dpkg
+# since at this point packages are just extracted but not installed, we cannot use dpkg-query
+# since we want to support chrootless, we cannot run dpkg --version inside the chroot
+# to avoid this hook depending on dpkg-dev being installed, we do not parse the extracted changelog with dpkg-parsechangelog
+# we also want to avoid parsing the changelog because /usr/share/doc might've been added to dpkg --path-exclude
+# instead, we just ask apt about the latest version of dpkg it knows of
+# this should only fail in situations where there are multiple versions of dpkg in different suites
+ver=$(env --chdir="$1" APT_CONFIG="$MMDEBSTRAP_APT_CONFIG" apt-cache show --no-all-versions dpkg 2>/dev/null | sed -ne 's/^Version: \(.*\)$/\1/p' || printf '')
+if [ -z "$ver" ]; then
+	echo "no package called dpkg can be installed -- not running jessie-or-older extract00 hook" >&2
+	exit 0
+fi
+
+if dpkg --compare-versions "$ver" ge 1.17.11; then
+	echo "dpkg version $ver is >= 1.17.11 -- not running jessie-or-older extract00 hook" >&2
+	exit 0
+else
+	echo "dpkg version $ver is << 1.17.11 -- running jessie-or-older extract00 hook" >&2
+fi
+
+# resolve the script path using several methods in order:
+#  1. using dirname -- "$0"
+#  2. using ./hooks
+#  3. using /usr/share/mmdebstrap/hooks/
+for p in "$(dirname -- "$0")/.." ./hooks /usr/share/mmdebstrap/hooks; do
+	if [ -x "$p/jessie-or-older/extract00.sh" ] && [ -x "$p/jessie-or-older/extract01.sh" ]; then
+		"$p/jessie-or-older/extract00.sh" "$1"
+		exit 0
+	fi
+done
+
+echo "cannot find jessie-or-older hook anywhere" >&2
+exit 1