uninit and auto-init

* Add uninit subcommand, which cleans up all etckeeper and VCS droppings
  in /etc. This is useful if you want to switch to a different VCS and
  don't have any history to preserve. (Preserving history and converting
  is of course possible, but significantly harder.)
* Run etckeeper init on initial install. Closes: #505772
  (The idea being that if someone doesn't want to use git, they can
  immediatly uninit to easily reverse this.)
* Document how to change the VCS used by etckeeper, without preserving
  any history. Preserving history left as an exersise for the reader.
  Closes: #515237

4 files changed, 38 insertions, 0 deletions

diff --git a/uninit.d/01prompt b/uninit.d/01prompt
new file mode 100755
index 0000000..e642a82
--- /dev/null
+++ b/uninit.d/01prompt
@@ -0,0 +1,18 @@
+#!/bin/sh
+set -e
+
+echo "** Warning: etckeeper uninit will DESTROY all recorded history for $ETCKEEPER_DIR"
+echo "** This includes deleting the $VCS repository and ignore file."
+echo ""
+printf "Are you sure you want to do this? [yN] "
+read answer
+case "$answer" in 
+	Y|y|yes|YES)
+		echo "Proceeding.."
+		exit 0
+	;;
+	*)
+		echo "Aborting etckeeper uninit."
+		exit 1
+	;;
+esac
diff --git a/uninit.d/50remove-metadata b/uninit.d/50remove-metadata
new file mode 100755
index 0000000..0be8d36
--- /dev/null
+++ b/uninit.d/50remove-metadata
@@ -0,0 +1,6 @@
+#!/bin/sh
+set -e
+
+# Files generated by etckeeper to store metadata the VCS cannot preserve.
+rm -f .etckeeper
+rm -f .metadata # only generated by old versions
diff --git a/uninit.d/50vcs-uninit b/uninit.d/50vcs-uninit
new file mode 100755
index 0000000..c9896ed
--- /dev/null
+++ b/uninit.d/50vcs-uninit
@@ -0,0 +1,12 @@
+#!/bin/sh
+set -e
+
+if [ "$VCS" = git ]; then
+	rm -rf .git .gitignore
+elif [ "$VCS" = hg ]; then
+	rm -rf .hg .hgignore
+elif [ "$VCS" = bzr ]; then
+	rm -rf .bzr .bzrignore
+elif [ "$VCS" = darcs ]; then
+	rm -rf _darcs .darcsignore
+fi
diff --git a/uninit.d/README b/uninit.d/README
new file mode 100644
index 0000000..d1a4eaa
--- /dev/null
+++ b/uninit.d/README
@@ -0,0 +1,2 @@
+Executable files in this directory are run to uninitialise the working
+directory, removing files added by `etckeeper init`.