1 files changed, 83 insertions, 0 deletions
diff --git a/debian/preinst b/debian/preinst
new file mode 100644
index 0000000..4dda427
--- /dev/null
+++ b/debian/preinst
@@ -0,0 +1,83 @@
+#!/bin/sh
+set -e
+
+#DEBHELPER#
+
+# Prepare to move a conffile without triggering a dpkg question
+prep_mv_conffile() {
+	PKGNAME="$1"
+	CONFFILE="$2"
+
+	if [ -e "$CONFFILE" ]; then
+		md5sum="`md5sum \"$CONFFILE\" | sed -e \"s/ .*//\"`"
+		old_md5sum="`dpkg-query -W -f='${Conffiles}' $PKGNAME | sed -n -e \"\\\\' $CONFFILE'{s/ obsolete$//;s/.* //p}\"`"
+		if [ "$md5sum" = "$old_md5sum" ]; then
+			rm -f "$CONFFILE"
+		fi
+	fi
+}
+
+# Remove a no-longer used conffile
+rm_conffile() {
+	PKGNAME="$1"
+	CONFFILE="$2"
+
+	if [ -e "$CONFFILE" ]; then
+		md5sum="`md5sum \"$CONFFILE\" | sed -e \"s/ .*//\"`"
+		old_md5sum="`dpkg-query -W -f='${Conffiles}' $PKGNAME | sed -n -e \"\\\\' $CONFFILE'{s/ obsolete$//;s/.* //p}\"`"
+		if [ "$md5sum" != "$old_md5sum" ]; then
+			echo "Obsolete conffile $CONFFILE has been modified by you."
+			echo "Saving as $CONFFILE.dpkg-bak ..."
+			mv -f "$CONFFILE" "$CONFFILE".dpkg-bak
+		else
+			echo "Removing obsolete conffile $CONFFILE ..."
+			rm -f "$CONFFILE"
+		fi
+	fi
+}
+
+case "$1" in
+install|upgrade)
+	if dpkg --compare-versions "$2" le "0.7"; then
+		for c in README 50uncommitted-changes; do
+			prep_mv_conffile etckeeper "/etc/etckeeper/pre-apt.d/$c"
+		done
+		for c in README 10git-test 30git-add 40git-rm 50git-commit; do
+			prep_mv_conffile etckeeper "/etc/etckeeper/post-apt.d/$c"
+		done
+		for c in 40git-init 50git-ignore 50git-perm \
+		         50git-pre-commit-hook 70git-add; do
+			prep_mv_conffile etckeeper "/etc/etckeeper/init.d/$c"
+		done
+	fi
+	if dpkg --compare-versions "$2" le "0.10"; then
+        	for c in 10vcs-test 30git-add 30hg-addremove 40git-rm; do
+			prep_mv_conffile etckeeper "/etc/etckeeper/post-install.d/$c"
+
+		done
+	fi
+	if dpkg --compare-versions "$2" le "0.13"; then
+        	for c in 20store-empty-directory 40rm-old-metadata; do
+			rm_conffile etckeeper "/etc/etckeeper/pre-commit.d/$c"
+		done
+		for c in 10restore-etckeeper 20restore-metadata; do
+			prep_mv_conffile etckeeper "/etc/etckeeper/init.d/$c"
+		done
+	fi
+	if dpkg --compare-versions "$2" le "0.15"; then
+        	for c in 40bzr-rm 45bzr-precommit; do
+			rm_conffile etckeeper "/etc/etckeeper/commit.d/$c"
+		done
+	fi
+	if dpkg --compare-versions "$2" le "0.50"; then
+		for c in 20warn-hardlinks 20warn-special-file; do
+			rm_conffile etckeeper "/etc/etckeeper/pre-commit.d/$c"
+		done
+	fi
+	if dpkg --compare-versions "$2" le "0.61"; then
+		rm_conffile etckeeper "/etc/etckeeper/commit.d/40git-rm"
+	fi
+
+	# delete files the prerm stashes away to handle purging
+	rm -rf /var/cache/etckeeper/stash
+esac