Add config_subkeys

2 files changed, 47 insertions, 0 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7930672..3342642 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - The `var` subcommand is now referenced in `usage()`.
 - A `pkg` subcommand has been added, to allow for direct interaction with the
   `pkg_*()` utilities provided by Bashtard.
+- `config_subkeys()` and `config_subkeys_for` have been added, to look up
+  subkeys defined in config files. These can help when you want to use a list
+  somewhere in your configuration.
 
 ### Changed
 
diff --git a/lib/util/config.bash b/lib/util/config.bash
index 3f939ff..91d5c83 100644
--- a/lib/util/config.bash
+++ b/lib/util/config.bash
@@ -10,6 +10,10 @@ config() {
 	config_for "${BASHTARD_PLATFORM[fqdn]}" "$@"
 }
 
+config_subkeys() {
+	config_subkeys_for "${BASHTARD_PLATFORM[fqdn]}" "$@"
+}
+
 config_for() {
 	local host=$1 ; shift
 	local key=$1 ; shift
@@ -68,3 +72,43 @@ config_for() {
 	# Error
 	alert "bashtard/config_for" "No configuration value for $key"
 }
+
+config_subkeys_for() {
+	local host=$1 ; shift
+	local key=$1 ; shift
+
+	local file
+	local files
+
+	files=(
+		"$BASHTARD_ETCDIR/secrets"
+		"$BASHTARD_ETCDIR/hosts.d/$host"
+		"$BASHTARD_ETCDIR/os.d/${BASHTARD_PLATFORM[key]}"
+		"$BASHTARD_ETCDIR/defaults"
+	)
+
+	if [[ -n "$BASHTARD_PLAYBOOK" ]]
+	then
+		debug "bashtard/config_for" "BASHTARD_PLAYBOOK=$BASHTARD_PLAYBOOK, adding etc entries"
+		files+=(
+			"$BASHTARD_ETCDIR/playbooks.d/$BASHTARD_PLAYBOOK/etc/os.d/${BASHTARD_PLATFORM[key]}"
+			"$BASHTARD_ETCDIR/playbooks.d/$BASHTARD_PLAYBOOK/etc/defaults"
+		)
+	fi
+
+	files+=(
+		"$BASHTARD_SHAREDIR/os.d/${BASHTARD_PLATFORM[key]}"
+		"$BASHTARD_SHAREDIR/defaults"
+	)
+
+	# Check configuration files
+	for file in "${files[@]}"
+	do
+		debug "bashtard/config_subkeys" "Checking for subkeys of '$key' in '$file'"
+
+		[[ ! -f $file ]] && continue
+
+		grep "^$key\." "$file" \
+			| awk -F= '{ print $1 }'
+	done
+}