babeld: allow changing alternative configuration file and directory

Signed-off-by: Gabriel Kerneis <kerneis@google.com>
Signed-off-by: Markus Stenberg <markus.stenberg@iki.fi>

2 files changed, 17 insertions, 6 deletions

diff --git a/babeld/files/babeld.config b/babeld/files/babeld.config
index fa22fd6..cb2a131 100644
--- a/babeld/files/babeld.config
+++ b/babeld/files/babeld.config
@@ -1,10 +1,10 @@
 package babeld
 
-# Configuration set in this file ends up in /var/etc/babeld.conf.
-# Babeld is told to use both /etc/babeld.conf and /var/etc/babeld.conf, so
-# you can use one or the other, or even both at the same time.  If an
-# option is defined in both files, the version in /var/etc/babeld.conf
-# takes precedence.
+# Babeld reads options from the following files (the last one takes precedence
+# if an option is defined in several places):
+# - the file defined by the option conf_file (default: /etc/babeld.conf),
+# - *.conf files in the directory defined by conf_dir (default: /tmp/babel.d/),
+# - this UCI configuration file.
 
 # See "man babeld" for all available options ("Global options").
 # Important: remember to use '_' instead of '-' in option names.
@@ -20,6 +20,10 @@ config general
 	## import-table statement, "option import_table 42" should work.
 	# list 'import_table' '42'
 	# list 'import_table' '100'
+	## Alternative configuration file and directory.
+	## See comment at the top of this file for more details.
+	# option 'conf_file' '/etc/babeld.conf'
+	# option 'conf_dir' '/tmp/babel.d/'
 
 config interface
 	## Remove this line to enable babeld on this interface
diff --git a/babeld/files/babeld.init b/babeld/files/babeld.init
index 797ba2f..6796a34 100755
--- a/babeld/files/babeld.init
+++ b/babeld/files/babeld.init
@@ -13,7 +13,7 @@ EXTRA_HELP="        status Dump Babel's table to the log file."
 
 # Options to ignore for the global section (old options that are translated
 # for backward compatibility with old configuration files)
-ignored_options="carrier_sense assume_wireless no_split_horizon random_router_id multicast_address port hello_interval wired_hello_interval smoothing_half_time duplication_priority local_server conf_file"
+ignored_options="carrier_sense assume_wireless no_split_horizon random_router_id multicast_address port hello_interval wired_hello_interval smoothing_half_time duplication_priority local_server conf_file conf_dir"
 
 # Append a line to the configuration file
 cfg_append() {
@@ -109,6 +109,13 @@ parse_old_global_options() {
 	[ "$_bool" -eq 1 ] && add_default_option "wired" "false"
 	config_get_bool _bool "$section" 'no_split_horizon' 0
 	[ "$_bool" -eq 1 ] && add_default_option "split_horizon" "false"
+        # Configure alternative configuration file and directory
+	local conf_file
+	config_get conf_file "$section" "conf_file"
+	[ -n "$conf_file" ] && OTHERCONFIGFILE="$conf_file"
+	local conf_dir
+	config_get conf_dir "$section" "conf_dir"
+	[ -n "$conf_dir" ] && OTHERCONFIGDIR="$conf_dir"
 }
 
 babel_filter() {