[WIP] Less restrictive preflight checks in target-helper mode

dev/n_osync.sh

@@ -10,7 +10,7 @@ PROGRAM="osync" # Rsync based two way sync engine with fault tolerance
 AUTHOR="(C) 2013-2018 by Orsiris de Jong"
 CONTACT="http://www.netpower.fr/osync - ozy@netpower.fr"
 PROGRAM_VERSION=1.3.0-beta1
-PROGRAM_BUILD=2018100103
+PROGRAM_BUILD=2018100104
 IS_STABLE=no
 
 ##### Execution order						#__WITH_PARANOIA_DEBUG
@@ -153,17 +153,27 @@ function CheckEnvironment {
 
 # Only gets checked in config file mode where all values should be present
 function CheckCurrentConfig {
-	__CheckArguments 0 $# "$@"    #__WITH_PARANOIA_DEBUG
+	local fullCheck="${1:-true}"
+
+	__CheckArguments 1 $# "$@"    #__WITH_PARANOIA_DEBUG
+
+	# Full check is for initiator driven runs
+	if [ $fullCheck == true ]; then
+		declare -a yes_no_vars=(CREATE_DIRS SUDO_EXEC SSH_COMPRESSION SSH_IGNORE_KNOWN_HOSTS REMOTE_HOST_PING PRESERVE_PERMISSIONS PRESERVE_OWNER PRESERVE_GROUP PRESERVE_EXECUTABILITY PRESERVE_ACL PRESERVE_XATTR COPY_SYMLINKS KEEP_DIRLINKS PRESERVE_HARDLINKS CHECKSUM RSYNC_COMPRESS CONFLICT_BACKUP CONFLICT_BACKUP_MULTIPLE SOFT_DELETE RESUME_SYNC FORCE_STRANGER_LOCK_RESUME PARTIAL DELTA_COPIES STOP_ON_CMD_ERROR RUN_AFTER_CMD_ON_ERROR)
+		declare -a num_vars=(MINIMUM_SPACE BANDWIDTH SOFT_MAX_EXEC_TIME HARD_MAX_EXEC_TIME KEEP_LOGGING MIN_WAIT MAX_WAIT CONFLICT_BACKUP_DAYS SOFT_DELETE_DAYS RESUME_TRY MAX_EXEC_TIME_PER_CMD_BEFORE MAX_EXEC_TIME_PER_CMD_AFTER)
+	# target-helper runs need less configuration
+	else
+		declare -a yes_no_vars=(SUDO_EXEC SSH_COMPRESSION SSH_IGNORE_KNOWN_HOSTS REMOTE_HOST_PING STOP_ON_CMD_ERROR RUN_AFTER_CMD_ON_ERROR)
+		declare -a num_vars=(KEEP_LOGGING MIN_WAIT MAX_WAIT)
+	fi
 
 	# Check all variables that should contain "yes" or "no"
-	declare -a yes_no_vars=(CREATE_DIRS SUDO_EXEC SSH_COMPRESSION SSH_IGNORE_KNOWN_HOSTS REMOTE_HOST_PING PRESERVE_PERMISSIONS PRESERVE_OWNER PRESERVE_GROUP PRESERVE_EXECUTABILITY PRESERVE_ACL PRESERVE_XATTR COPY_SYMLINKS KEEP_DIRLINKS PRESERVE_HARDLINKS CHECKSUM RSYNC_COMPRESS CONFLICT_BACKUP CONFLICT_BACKUP_MULTIPLE SOFT_DELETE RESUME_SYNC FORCE_STRANGER_LOCK_RESUME PARTIAL DELTA_COPIES STOP_ON_CMD_ERROR RUN_AFTER_CMD_ON_ERROR)
 	for i in "${yes_no_vars[@]}"; do
 		test="if [ \"\$$i\" != \"yes\" ] && [ \"\$$i\" != \"no\" ]; then Logger \"Bogus $i value [\$$i] defined in config file. Correct your config file or update it using the update script if using and old version.\" \"CRITICAL\"; exit 1; fi"
 		eval "$test"
 	done
 
 	# Check all variables that should contain a numerical value >= 0
-	declare -a num_vars=(MINIMUM_SPACE BANDWIDTH SOFT_MAX_EXEC_TIME HARD_MAX_EXEC_TIME KEEP_LOGGING MIN_WAIT MAX_WAIT CONFLICT_BACKUP_DAYS SOFT_DELETE_DAYS RESUME_TRY MAX_EXEC_TIME_PER_CMD_BEFORE MAX_EXEC_TIME_PER_CMD_AFTER)
 	for i in "${num_vars[@]}"; do
 		test="if [ $(IsNumericExpand \"\$$i\") -eq 0 ]; then Logger \"Bogus $i value [\$$i] defined in config file. Correct your config file or update it using the update script if using and old version.\" \"CRITICAL\"; exit 1; fi"
 		eval "$test"
@@ -2933,7 +2943,11 @@ Init
 CheckEnvironment
 PostInit
 if [ $_QUICK_SYNC -lt 2 ]; then
-	CheckCurrentConfig
+	if [ "$_SYNC_ON_CHANGES" == "no" ]; then
+		CheckCurrentConfig true
+	else
+		CheckCurrentConfig false
+	fi
 fi
 CheckCurrentConfigAll
 DATE=$(date)
@@ -2941,9 +2955,9 @@ Logger "-------------------------------------------------------------" "NOTICE"
 Logger "$DRY_WARNING$DATE - $PROGRAM $PROGRAM_VERSION script begin." "ALWAYS"
 Logger "-------------------------------------------------------------" "NOTICE"
 Logger "Sync task [$INSTANCE_ID] launched as $LOCAL_USER@$LOCAL_HOST (PID $SCRIPT_PID)" "NOTICE"
-if [ $_SYNC_ON_CHANGES == "initiator" ]; then
+if [ "$_SYNC_ON_CHANGES" == "initiator" ]; then
 	SyncOnChanges false
-elif [ $_SYNC_ON_CHANGES == "target" ]; then
+elif [ "$_SYNC_ON_CHANGES" == "target" ]; then
 	SyncOnChanges true
 else
 	GetRemoteOS