Implement zap

3 files changed, 46 insertions, 0 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e2f9903..157dc0e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Configuration variables can be assigned values of other variables with the
   `&=` assignment. This allows a single value to be re-used dynamically, rather
   than having to explicitly set the same value several times.
+- A `zap` command has been added to remove a playbook from the registry without
+  running the playbook's `playbook_del()` function. This is intended to easily
+  remove registry entries when a playbook itself has been deleted or is
+  otherwise broken in a way that the regular `del` subcommand cannot fix.
 
 ### Fixed
 
diff --git a/lib/main.bash b/lib/main.bash
index 57f1559..196bbbf 100644
--- a/lib/main.bash
+++ b/lib/main.bash
@@ -89,6 +89,7 @@ Usage:
 	$BASHTARD_NAME top
 	$BASHTARD_NAME var [-p <playbook>] <key>
 	$BASHTARD_NAME var [-s] <key> <value>
+	$BASHTARD_NAME zap <playbook>
 
 Perform maintenance on your infra.
 
@@ -105,6 +106,8 @@ Commands:
 	sysinfo  Show gathered information about this system.
 	top      Show resource information about all known hosts.
 	var      Show or set the value of a given configuration key.
+	zap      Remove a playbook from the registry without attempting to run
+	         the delete step from the playbook.
 EOF
 
 	if [[ ! -d "$BASHTARD_ETCDIR/playbooks.d" ]]
diff --git a/lib/subcommands/zap.bash b/lib/subcommands/zap.bash
new file mode 100644
index 0000000..6864a33
--- /dev/null
+++ b/lib/subcommands/zap.bash
@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+
+# SPDX-FileCopyrightText: 2023 Patrick Spek <p.spek@tyil.nl>
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+subcommand()
+{
+	local buffer
+	local playbook_base
+	local playbook_registry
+
+	export BASHTARD_PLAYBOOK="$1" ; shift
+
+	if [[ -z "$BASHTARD_PLAYBOOK" ]]
+	then
+		crit "bashtard/zap" "No playbook name specified"
+		return
+	fi
+
+	playbook_base="$(playbook_path "base")"
+	playbook_registry="$BASHTARD_ETCDIR/registry.d/${BASHTARD_PLATFORM[fqdn]}"
+
+	# Make sure we only run add if the playbook is not in the registry yet
+	if ! grep -Fqx "$BASHTARD_PLAYBOOK" "$playbook_registry"
+	then
+		crit "bashtard/zap" "'$BASHTARD_PLAYBOOK' is not registered for ${BASHTARD_PLATFORM[fqdn]}"
+		return 3
+	fi
+
+	notice "bashtard/zap" "Removing playbook '$BASHTARD_PLAYBOOK' from '${BASHTARD_PLATFORM[fqdn]}'"
+
+	buffer="$(tmpfile)"
+
+	# Remove the playbook from the registry
+	cp -- "$playbook_registry" "$buffer"
+	grep -Fvx "$BASHTARD_PLAYBOOK" "$buffer" \
+		| sort > "$playbook_registry"
+}