1 files changed, 65 insertions, 0 deletions
diff --git a/lib/util/config.bash b/lib/util/config.bash
new file mode 100644
index 0000000..a3b1727
--- /dev/null
+++ b/lib/util/config.bash
@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+
+# Read a particular value from a key/value configuration file. Using this
+# function introduces a dependency on awk.
+config() {
+	config_for "${BASHTARD_PLATFORM[fqdn]}" "$@"
+}
+
+config_for() {
+	local host=$1 ; shift
+	local key=$1 ; shift
+	local default=$1 ; shift
+
+	local default
+	local file
+	local files
+
+	files=(
+		"$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"
+			"$BASHTARD_ETCDIR/playbooks.d/$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_for" "Checking for '$key' in '$file'"
+
+		[[ ! -f $file ]] && continue
+
+		value="$(awk -F= '$1 == "'"$key"'" { print $NF }' "$file")"
+
+		if [[ -n $value ]]
+		then
+			debug "bashtard/config_for" "Found $key=$value in $file"
+
+			printf "%s" "$value"
+			return
+		fi
+	done
+
+	# Return default value
+	if [[ -n $default ]]
+	then
+		printf "%s" "$default"
+		return
+	fi
+
+	# Error
+	alert "bashtard/config_for" "No configuration value for $key"
+}