[PATCH 2/8] zone: new function zone_config_id_is_valid

[Jonatan Schlag <jonatan.schlag@ipfire.org>]

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This function is needed to implement the id feature
described in #11405

Signed-off-by: Jonatan Schlag <jonatan.schlag(a)ipfire.org>
---
 src/functions/functions.zone | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/functions/functions.zone b/src/functions/functions.zone
index b44d3b5..fcc7bfa 100644
--- a/src/functions/functions.zone
+++ b/src/functions/functions.zone
@@ -1048,6 +1048,19 @@ zone_config_hook_is_configured() {
 	return ${EXIT_FALSE}
 }
 
+zone_config_id_is_valid() {
+	# This function checks if a given id is valid for a zone
+	# Return True when yes and false when no
+
+	assert [ $# -eq 2 ]
+	local zone=${1}
+	local id=${2}
+
+	local zone_path=$(zone_dir ${zone})
+
+	[ -f ${zone_path}/configs/*.${id} ];
+}
+
 zone_has_ip() {
 	device_has_ip $@
 }
-- 
2.6.3